CHARTWELL RE CORP
8-K, 1999-06-25
ACCIDENT & HEALTH INSURANCE
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                       SECURITIES AND EXCHANGE COMMISSION
                              Washington, DC 20549
                                 ---------------

                                    FORM 8-K

                                 CURRENT REPORT
                     PURSUANT TO SECTION 13 OR 15(D) OF THE
                         SECURITIES EXCHANGE ACT OF 1934



Date of Report (Date of earliest event reported)          June 21, 1999
                                                --------------------------------


                            Chartwell Re Corporation
- --------------------------------------------------------------------------------
             (Exact Name of Registrant as Specified in its Charter)



Delaware                         1-12502                         41-1652573
- --------------------------------------------------------------------------------
(State or Other           (Commission File Number)              (IRS Employer
Jurisdiction of                                              Identification No.)
Incorporation)



Four Stamford Plaza,  P. O. Box 120043, Stamford, CT               06912-0043
- --------------------------------------------------------     -------------------
Address of Principal Executive Offices)                            (Zip Code)



Registrant's telephone number, including area code  (203) 705-2500
                                                   -----------------------------

- --------------------------------------------------------------------------------
          (Former Name or Former Address, if Changed Since Last Report)





<PAGE>


Item 5. - Other Events

         Chartwell Re Corporation, a Delaware corporation ("Chartwell"), entered
into a definitive  Agreement and Plan of Merger,  dated as of June 21, 1999 (the
"Merger   Agreement")   with  Trenwick   Group  Inc.,  a  Delaware   corporation
("Trenwick"),  pursuant to which Chartwell will be merged with and into Trenwick
(the "Merger"). In connection with the Merger Agreement,  Trenwick and Chartwell
have entered into a Stock Option Agreement, dated as of June 21, 1999.

         On June 22, 1999,  Chartwell and Trenwick  issued a joint press release
announcing  the Merger,  which is filed  herewith  as Exhibit  99.2 and which is
incorporated by reference herein.

Item 7. Financial Statements and Exhibits

(c)      Exhibits

2.1      Agreement  and Plan of  Merger,  dated as of June   21,  1999,  between
         Trenwick and Chartwell.

99.1     Stock Option Agreement, dated as of June 21, 1999, between Trenwick and
         Chartwell

99.2     Press release of Trenwick and Chartwell issued June 22, 1999.



                                    SIGNATURE

         Pursuant to the  Requirements  of the Securities  Exchange Act of 1934,
the  registrant  has duly  caused  this report to be signed on its behalf by the
undersigned hereunto duly authorized.

                                            CHARTWELL RE CORPORATION


                                         By: /s/ John V. Del Col
                                             ----------------------------------
                                             John V. Del Col
                                             Vice President, General Counsel
                                             and Secretary




Dated:  June 25, 1999


                                      -2-
<PAGE>


                                  EXHIBIT INDEX



Exhibit                    Description of Exhibit
- --------                   ----------------------

2.1       Agreement and Plan of Merger,  dated as of June 21, 1999,  between
          Trenwick and Chartwell.

99.1      Stock Option Agreement, dated as of June 21, 1999, between Trenwick
          and Chartwell

99.2      Press release of Trenwick and Chartwell issued June 22, 1999.






                                      -3-






     -----------------------------------------------------------------------


                          AGREEMENT AND PLAN OF MERGER

                                     BETWEEN

                               TRENWICK GROUP INC.

                                       AND

                            CHARTWELL RE CORPORATION

                            Dated as of June 21, 1999


     -----------------------------------------------------------------------


<PAGE>


                                Table of Contents


                                    ARTICLE I

                                   THE MERGER

SECTION 1.1. The Merger.......................................................2
SECTION 1.2. Closing..........................................................2
SECTION 1.3. Effective Time...................................................2
SECTION 1.4. Effects of the Merger............................................2
SECTION 1.5. Certificate of Incorporation; By-laws............................2
SECTION 1.6. Directors and Officers...........................................3

                                   ARTICLE II

                       EFFECT OF THE MERGER ON SECURITIES

SECTION 2.1. Effect on Capital Stock..........................................3
              (a)     Cancellation of Treasury Stock and Trenwick-Owned
                      Stock...................................................3
              (b)     Conversion of Chartwell Common Stock....................3
              (c)     Conversion Number.......................................4
              (d)     Cancellation and Retirement of Chartwell Common Stock...4
SECTION 2.2. Exchange of Certificates.........................................4
              (a)     Exchange Agent..........................................4
              (b)     Letter of Transmittal...................................4
              (c)     Exchange Procedures.....................................4
              (d)     Distributions with Respect to Unexchanged Shares........5
              (e)     No Further Ownership Rights in Chartwell Common Stock...5
              (f)     No Fractional Shares....................................5
              (g)     Termination of Exchange Fund and Common Shares Trust....6
              (h)     No Liability............................................6
              (i)     Lost Certificates.......................................7
SECTION 2.3. Tax Consequences of Merger.......................................7
SECTION 2.4. Stock Options, Warrants and Stock Purchase Plans.................7
SECTION 2.5. Adjustments......................................................8

                                   ARTICLE III

                         REPRESENTATIONS AND WARRANTIES

SECTION 3.1. Representations and Warranties of Chartwell......................8
              (a)     Organization, Standing and Corporate Power..............8
              (b)     Subsidiaries............................................9
              (c)     Capital Structure.......................................9
              (d)     Authority; Noncontravention............................10

                                       i
<PAGE>

                                Table of Contents
                                ----------------
                                  (continued)


              (e)     SEC Documents; Financial Statements....................11
              (f)     Information Supplied...................................13
              (g)     Absence of Certain Changes or Events...................13
              (h)     Benefit Plans..........................................14
              (i)     Taxes..................................................19
              (j)     No Excess Parachute Payments; Section 162(m)
                      of the Code............................................21
              (k)     Compliance with Applicable Laws........................21
              (l)     Litigation.............................................21
              (m)     No Undisclosed Liabilities.............................22
              (n)     Reserves...............................................22
              (o)     Insurance Issued.......................................23
              (p)     Opinion of Financial Advisor...........................23
              (q)     Voting Requirements....................................23
              (r)     Rights Agreement; Section 203..........................23
              (s)     Brokers................................................24
              (t)     No Default.............................................24
              (u)     Related Party Transactions.............................24
              (v)     Title to Property......................................24
              (w)     Environmental..........................................25
              (x)     Chartwell Investees....................................25
              (y)     Reinsurance Contracts, Coverholders and MGAs...........26
              (z)     Reinsurance Agreement..................................27
SECTION 3.2. Representations and Warranties of Trenwick......................27
              (a)     Organization, Standing and Corporate Power.............27
              (b)     Subsidiaries...........................................27
              (c)     Capital Structure......................................27
              (d)     Authority; Noncontravention............................28
              (e)     SEC Documents; Financial Statements....................29
              (f)     Information Supplied...................................31
              (g)     Absence of Certain Changes or Events...................31
              (h)     Benefit Plans..........................................32
              (i)     Taxes..................................................36
              (j)     Compliance with Applicable Laws........................38
              (k)     Litigation.............................................38
              (l)     No Undisclosed Liabilities.............................39
              (m)     Reserves...............................................39
              (n)     Opinion of Financial Advisor...........................40
              (o)     Voting Requirements....................................40
              (p)     Brokers................................................40
              (q)     No Default.............................................40
              (r)     Related Party Transactions.............................40
              (s)     Title to Property......................................41
              (t)     Environmental..........................................41


                                       ii

<PAGE>

                                Table of Contents
                                ----------------
                                   (continued)


              (u)     Reinsurance Contracts, Coverholders and MGAs...........42
              (v)     Trenwick Investees.....................................42
              (w)     Insurance Issued.......................................43
              (x)     Approvals and Permits..................................43

                                   ARTICLE IV

                    COVENANTS RELATING TO CONDUCT OF BUSINESS

SECTION 4.1. Conduct of Business.............................................43
              (a)     Conduct of Business by Chartwell.......................43
              (b)     Conduct of Business by Trenwick........................45
              (c)     Other Actions..........................................48
              (d)     Advice of Changes......................................48
SECTION 4.2. No Solicitation by Chartwell....................................48

                                    ARTICLE V

                              ADDITIONAL AGREEMENTS

SECTION 5.1. Preparation of the Form S-4 and the Joint Proxy Statement.......50
SECTION 5.2. Stockholder Approval............................................51
SECTION 5.3. Access to Information; Confidentiality..........................51
SECTION 5.4. Commercially Reasonable Efforts.................................52
SECTION 5.5. Benefit Plans...................................................52
SECTION 5.6. Indemnification and Insurance...................................52
SECTION 5.7. Public Announcements............................................53
SECTION 5.8. Consents, Approvals and Filings.................................54
SECTION 5.9. NASDAQ Approval.................................................54
SECTION 5.10. Affiliates and Certain Stockholders............................55
SECTION 5.11. Tax Matters....................................................55
SECTION 5.12. Letters of Accountants.........................................55
SECTION 5.13. Stockholder Litigation.........................................55
SECTION 5.14. Fees and Expenses..............................................55
SECTION 5.15. Reinsurance Agreement..........................................57

                                   ARTICLE VI

                              CONDITIONS PRECEDENT

SECTION 6.1. Conditions to Each Party's Obligation To Effect the Merger......57
              (a)     Stockholder Approval...................................57
              (b)     Governmental, Regulatory and Lloyd's Consents..........57
              (c)     HSR Act................................................57

                                      iii

<PAGE>


                                Table of Contents
                                ----------------
                                   (continued)


              (d)     No Injunctions or Restraints...........................57
              (e)     Form S-4...............................................58
              (f)     NASDAQ.................................................58
              (g)     Third-Party Consents...................................58
SECTION 6.2. Conditions to Obligation of Trenwick............................58
              (a)     Representations and Warranties.........................58
              (b)     Performance of Obligations of Chartwell................58
              (c)     Tax Opinion............................................58
              (d)     No Material Adverse Change.............................58
              (e)     Ratings................................................59
              (f)     Reinsurance Agreement..................................59
              (g)     Opinion................................................59
SECTION 6.3. Conditions to Obligation of Chartwell...........................59
              (a)     Representations and Warranties.........................59
              (b)     Performance of Obligations of Trenwick.................59
              (c)     Tax Opinion............................................59
              (d)     Material Adverse Change................................59
              (e)     Ratings................................................59

                                   ARTICLE VII

                        TERMINATION, AMENDMENT AND WAIVER

SECTION 7.1. Termination.....................................................60
SECTION 7.2. Effect of Termination...........................................61
SECTION 7.3. Amendment.......................................................62
SECTION 7.4. Extension; Waiver...............................................62
SECTION 7.5. Procedure for Termination, Amendment, Extension or Waiver.......62

                                  ARTICLE VIII

                               GENERAL PROVISIONS

SECTION 8.1. Nonsurvival of Representations and Warranties...................62
SECTION 8.2. Definitions.....................................................62
SECTION 8.3. Notices.........................................................64
SECTION 8.4. Interpretation..................................................65
SECTION 8.5. Counterparts....................................................65
SECTION 8.6. Entire Agreement; No Other Representations; No Third-Party
             Beneficiaries...................................................65
SECTION 8.7. Governing Law...................................................66
SECTION 8.8. Assignment......................................................66
SECTION 8.9. Enforcement and Consent to Jurisdiction.........................66
SECTION 8.10. Severability...................................................66


                                       iv

<PAGE>


                          AGREEMENT AND PLAN OF MERGER


                  AGREEMENT  AND PLAN OF MERGER,  dated as of June 21, 1999 (the
"Agreement"),  between Trenwick Group Inc., a Delaware corporation  ("Trenwick")
and Chartwell Re Corporation, a Delaware corporation ("Chartwell").

                  WHEREAS,  the  respective  Boards of Directors of Trenwick and
Chartwell  deem it  advisable  and in the  best  interest  of  their  respective
companies  and  stockholders  to enter into this  Agreement,  pursuant  to which
Chartwell  shall be  merged  with  and into  Trenwick  (the  "Merger"),  and the
transactions  contemplated  hereby and have adopted  resolutions  approving this
Agreement and the transactions contemplated hereby;

                  WHEREAS,  as a condition to Trenwick's  willingness to execute
and deliver this  Agreement,  to pay the Merger  Consideration  to the Chartwell
stockholders   and  to  consummate   the  Merger  and  the  other   transactions
contemplated  hereby,  Trenwick has required,  and  Chartwell  has agreed,  that
Trenwick be indemnified and  guaranteed,  effective as of the Effective Time (as
defined herein), against certain adverse development in the reserves for losses,
loss adjustment expenses and certain other balance sheet items of Chartwell, and
that such  indemnity  and  guaranty  be  accomplished  through  the  reinsurance
agreement  described in Section 3.1(z) of the Chartwell  Disclosure Schedule (as
defined herein) (the "Reinsurance  Agreement") and whereas, such indemnification
and  guarantee  will  be  effected  through  the  securing  of  the  Reinsurance
Agreement,  which  will  be  effective  at the  Effective  Time  and an  express
condition to the closing of the Merger and whereas,  consummation  of the Merger
is predicated upon the Reinsurance Agreement being obtained by Chartwell;

                  WHEREAS, for federal income tax purposes,  it is intended that
the Merger will qualify as a reorganization  under the provisions of Section 368
(a) of the Internal Revenue Code of 1986, as amended (the "Code");

                  WHEREAS,  subject to and  immediately  following the execution
and  delivery  of this  Agreement,  Chartwell  and  Trenwick  will enter into an
agreement (the "Stock Option Agreement"), pursuant to which Chartwell will grant
Trenwick  the  option  to  purchase  a number  of  shares  equal to 19.9% of the
outstanding  common stock,  par value $.01 per share,  of Chartwell  ("Chartwell
Common Stock"),  upon the terms and subject to the conditions set forth therein;
and

                  WHEREAS,   Trenwick  and  Chartwell  desire  to  make  certain
representations,  warranties,  covenants and  agreements in connection  with the
Merger and also to prescribe various conditions to the Merger.

                  NOW,  THEREFORE,  in  consideration  of  the  representations,
warranties,  covenants and agreements  contained in this Agreement,  the parties
agree as follows:

                                       1
<PAGE>

                                   ARTICLE I

                                   THE MERGER

     SECTION 1.1. The Merger.  Upon the terms and subject to the  conditions set
forth in this Agreement, and in accordance with the Delaware General Corporation
Law (the  "DGCL"),  Chartwell  shall be  merged  with and into  Trenwick  at the
Effective Time (as  hereinafter  defined).  At the Effective  Time, the separate
existence of Chartwell shall cease, and Trenwick shall continue as the surviving
corporation (the "Surviving Corporation").

     SECTION 1.2.  Closing.  Unless this  Agreement  shall have been  terminated
pursuant to Section  7.1, and subject to the  satisfaction  or waiver of each of
the  conditions  set  forth in  Article  VI,  the  closing  of the  Merger  (the
"Closing")  shall  take  place at 10:00  a.m.  on the  date  that is the  second
business day  following  the date on which the last to be fulfilled or waived of
the  conditions  set  forth in  Section  6.1  shall be  fulfilled  or  waived in
accordance with this Agreement (other than those conditions that by their nature
are to be  fulfilled  on the Closing  Date,  but subject to the  fulfillment  or
waiver of those  conditions),  at the  offices  of Baker &  McKenzie,  805 Third
Avenue,  New York, New York,  unless another date, time or place is agreed to in
writing by the  parties  hereto.  The actual  date and time of the  Closing  are
herein referred to as the "Closing Date."

     SECTION  1.3.  Effective  Time.  The  parties  hereto  will  file  with the
Secretary of State of the State of Delaware (the "Delaware  Secretary of State")
on the  date of the  Closing  (or on such  other  later  date  as  Trenwick  and
Chartwell  may agree in writing) a  certificate  of merger or other  appropriate
documents,  executed in accordance with the relevant provisions of the DGCL, and
make all other filings or recordings  required under the DGCL in connection with
the Merger. The Merger shall become effective upon the filing of the certificate
of merger  with the  Delaware  Secretary  of State,  or at such later time as is
specified in the certificate of merger (the "Effective Time").

     SECTION 1.4.  Effects of the Merger.  The Merger shall have the effects set
forth in  Section  259 of the  DGCL.  Without  limiting  the  generality  of the
foregoing,  and subject  thereto,  at the Effective  Time,  all the  properties,
rights,  privileges,  powers and franchises of Chartwell and Trenwick shall vest
in the Surviving Corporation, and all debts, liabilities and duties of Chartwell
and Trenwick  shall become the debts,  liabilities  and duties of the  Surviving
Corporation, all as provided under the DGCL.

     SECTION 1.5  Certificate of  Incorporation;  By-laws.  (a) At the Effective
Time and without any further  action on the part of Chartwell  or Trenwick,  the
Restated Certificate of Incorporation of Trenwick as in effect immediately prior
to the Effective Time shall be the certificate of incorporation of the Surviving
Corporation until thereafter amended as provided therein and under the DGCL.

                  (b) At the  Effective  Time and without any further  action on
the part of Chartwell or Trenwick,  the By-laws of Trenwick shall be the By-laws
of the Surviving  Corporation until thereafter amended or repealed in accordance
with  their  terms  or  the  Certificate  of   Incorporation  of  the  Surviving
Corporation and as provided by law.

                                       2
<PAGE>

     SECTION 1.6.  Directors and Officers.  (a) The directors of Trenwick at the
Effective  Time shall be the directors of the Surviving  Corporation;  provided,
that at the Effective  Time,  Trenwick  shall  increase the size of its Board of
Directors in order to enable the four (4)  individuals  set forth in Section 1.6
of the Chartwell Disclosure Schedule,  or any mutually agreed substitute for any
of such  individuals  who is unwilling or unable to so serve (the  "Designees"),
which  Designees  shall  include any  director  whose  election is provided  for
pursuant to the  Stockholders  Agreement,  dated as of December 13, 1995,  among
Chartwell and the security holders named or referenced therein, to be members of
the Trenwick Board of Directors.  The Trenwick Board of Directors  shall appoint
each of the  Designees  to the Trenwick  Board of Directors as of the  Effective
Time,  with such Designees to be divided as evenly as possible among the classes
of directors of Trenwick.

                  (b) The officers of Trenwick at the Effective Time shall, from
and after the  Effective  Time,  be the officers of the  Surviving  Corporation,
until the  earlier of their  resignation  or removal or until  their  respective
successors are duly elected and qualified, as the case may be.

                                   ARTICLE II

                       EFFECT OF THE MERGER ON SECURITIES

     SECTION 2.1.  Effect on Capital Stock.  As of the Effective Time, by virtue
of the Merger and without any action on the part of the holders of any shares of
Chartwell  Common Stock or any other shares of capital stock of Chartwell or any
shares of capital stock of Trenwick:

     (a) Cancellation of Treasury Stock and Trenwick-Owned  Stock. Each share of
Chartwell Common Stock issued and outstanding immediately prior to the Effective
Time that is owned by Trenwick or any  subsidiary of Trenwick or by Chartwell or
any subsidiary of Chartwell  (together,  in each case, with the associated Right
(as defined in Section 3.1(c)) shall  automatically  be canceled and retired and
shall cease to exist, and no cash or other  consideration  shall be delivered or
deliverable in exchange therefor.

     (b) Conversion of Chartwell  Common Stock.  Each share of Chartwell  Common
Stock issued and outstanding immediately prior to the Effective Time (other than
shares to be canceled in  accordance  with  Section  2.1(a))  together  with the
associated  Right shall be converted  into the right to receive that number (the
"Stock Consideration") of validly issued, fully paid and nonassessable shares of
common stock,  par value $.10 per share, of Trenwick  ("Trenwick  Common Stock")
which is equal to the  Conversion  Number (as  defined in Section  2.1(c)).  The
Stock  Consideration  and any cash to be paid in accordance  with Section 2.2 in
lieu of fractional shares of Chartwell Common Stock are referred to collectively
as the "Merger Consideration."


                                       3

<PAGE>

     (c)  Conversion  Number.  As used herein, "Conversion  Number"  shall mean
0.825.

     (d)  Cancellation  and  Retirement  of  Chartwell  Common Stock.  As of the
Effective  Time, all  shares of  Chartwell Common Stock,  other  than  shares to
be  canceled  in  accordance  with  Section   2.1(a),   issued  and  outstanding
immediately  prior to the Effective  Time,  shall no longer be  outstanding  and
shall  automatically  be canceled and retired and shall cease to exist, and each
holder of a certificate  representing  any such shares of Chartwell Common Stock
shall cease to have any rights with respect thereto, except the right to receive
the Merger  Consideration  upon surrender of such certificate in accordance with
Section 2.2, without interest.

     SECTION 2.2.   Exchange of Certificates.

     (a) Exchange Agent. As of the Effective Time, Trenwick shall deposit with a
bank or trust company  designated  by Trenwick and  reasonably  satisfactory  to
Chartwell  (the  "Exchange  Agent"),  certificates  representing  the  shares of
Trenwick  Common Stock  representing  the aggregate  Stock  Consideration  (such
certificates,  together with any dividends or distributions with respect to such
certificates, being hereinafter referred to as the "Exchange Fund").

     (b) Letter of  Transmittal.  Promptly  after the Effective  Time (but in no
event more than 5 days  thereafter),  the Surviving  Corporation shall cause the
Exchange Agent to mail to each record holder of  certificates  that  immediately
prior to the Effective Time  represented  shares of Chartwell Common Stock which
have been converted pursuant to Section 2.1, a form of letter of transmittal and
instructions  for  use in  surrendering  such  certificates  and  receiving  the
consideration to which such holder shall be entitled pursuant to Section 2.1.


     (c) Exchange  Procedures.  As soon as practicable after the Effective Time,
each holder of an outstanding  certificate or certificates which  prior  thereto
represented  shares of  Chartwell  Common  Stock  shall,  upon  surrender to the
Exchange Agent of such certificate or certificates and acceptance thereof by the
Exchange Agent, be entitled to a certificate  representing  that number of whole
shares  of  Trenwick  Common  Stock  (and cash in lieu of  fractional  shares of
Trenwick  Common Stock as  contemplated by this Section 2.2) which the aggregate
number  of shares of  Chartwell  Common  Stock  previously  represented  by such
certificate or certificates surrendered shall have been converted into the right
to receive  pursuant to Section  2.1(b) of this  Agreement.  The Exchange  Agent
shall accept such  certificates  upon compliance with such reasonable  terms and
conditions  as the  Exchange  Agent may  impose to  effect an  orderly  exchange
thereof in accordance with normal exchange practices. If the consideration to be
paid in the Merger (or any  portion  thereof) is to be  delivered  to any person
other  than the  person in whose  name the  certificate  representing  shares of
Chartwell Common Stock surrendered in exchange therefore is registered, it shall
be a condition to such exchange that the  certificate  so  surrendered  shall be
properly  endorsed  or  otherwise  be in proper form for  transfer  and that the
person  requesting such exchange shall pay to the Exchange Agent any transfer or
other taxes required by reason of the payment of such  consideration to a person
other  than the  registered  holder  of the  certificate  surrendered,  or shall
establish to the  satisfaction of the Exchange Agent that such tax has been paid
or is not  applicable.  After the  Effective  Time,  there  shall be no  further
transfer on the  records of  Chartwell  or its  transfer  agent of  certificates
representing  shares of  Chartwell  Common  Stock and if such  certificates  are
presented to Chartwell for transfer,  they shall be canceled against delivery of
the  Merger  Consideration  as  hereinabove   provided.   Until  surrendered  as
contemplated by this Section 2.2(c),  each  certificate  representing  shares of
Chartwell  Common  Stock  (other  than  certificates  representing  shares to be
cancelled in accordance  with Section  2.1(a)) shall be deemed at any time after
the Effective  Time to represent  only the right to receive upon such  surrender
the Merger  Consideration,  without any interest  thereon,  as  contemplated  by
Section  2.1.  No interest  will be paid or will  accrue on any cash  payable as
Merger Consideration.

                                       4

<PAGE>


     (d) Distributions with Respect to Unexchanged Shares. No dividends or other
distributions with respect to Trenwick Common Stock with a record date after the
Effective Time shall be paid to the holder of any certificate  that  immediately
prior to the Effective Time  represented  shares of Chartwell Common Stock which
have been converted pursuant to Section 2.1, until the surrender for exchange of
such  certificate in accordance  with this Article II.  Following  surrender for
exchange  of any such  certificate,  there  shall be paid to the  holder of such
certificate,  without interest, (i) at the time of such surrender, the amount of
dividends or other  distributions  with a record date after the  Effective  Time
theretofore  paid with respect to the number of whole shares of Trenwick  Common
Stock  into which the  shares of  Chartwell  Common  Stock  represented  by such
certificate  immediately prior to the Effective Time were converted  pursuant to
Section 2.1, and (ii) at the  appropriate  payment date, the amount of dividends
or other distributions with a record date after the Effective Time, but prior to
such surrender,  and with a payment date  subsequent to such surrender,  payable
with respect to such whole shares of Trenwick Common Stock.

     (e) No Further  Ownership  Rights in  Chartwell  Common  Stock.  The Merger
Consideration paid upon the surrender for exchange of certificates  representing
shares of Chartwell Common Stock in accordance with the terms of this Article II
shall be deemed to have been issued and paid in full  satisfaction of all rights
pertaining to the shares of Chartwell  Common Stock  theretofore  represented by
such certificates,  subject,  however, to the Surviving Corporation's obligation
(if any) to pay any dividends or make any other distributions with a record date
prior to the  Effective  Time which may have been  declared by Chartwell on such
shares of Chartwell  Common Stock in accordance with the terms of this Agreement
and which remain unpaid at the Effective Time.


     (f)  No  Fractional  Shares.  (i) No  certificates  or  scrip  representing
fractional  shares of Trenwick  Common Stock shall be issued upon the  surrender
for  exchange of  certificates  that  immediately  prior to the  Effective  Time
represented  shares of Chartwell Common Stock which have been converted pursuant
to Section 2.1, and such  fractional  share interests will not entitle the owner
thereof to vote or to any rights as a  stockholder  of  Trenwick.  No  Chartwell
stockholder shall be entitled to receive cash in lieu of fractional shares in an
amount greater than the value of one full share of Trenwick Common Stock.


                        (ii) As promptly as practicable following the  Effective
Time,  the  Exchange  Agent shall  determine  the  excess  of (x) the  number of
shares of Trenwick  Common Stock  delivered  to the  Exchange  Agent by Trenwick
pursuant to Section  2.2(a)  over (y) the  aggregate  number of whole  shares of
Trenwick Common Stock to be distributed to holders of the certificates  formerly
representing  shares of Chartwell  Common Stock pursuant to Section 2.2(c) (such
excess being herein  called the "Excess  Shares.").  As soon after the Effective
Time as  practicable,  the  Exchange  Agent,  as agent  for the  holders  of the
certificates  formerly representing shares of Chartwell Common Stock, shall sell
the Excess Shares at then prevailing  prices on the Nasdaq Stock Market National
Market  ("NASDAQ") all in the manner provided in paragraph (iii) of this Section
2.2(f).

                                        5

<PAGE>

                           (iii) The sale of the Excess  Shares by  the Exchange
Agent  shall be  executed  on NASDAQ  through  one or  more   authorized  market
makers and shall be executed in round lots to the extent practicable.  Until the
net proceeds of such sale or sales have been  distributed  to the holders of the
certificates,  the  Exchange  Agent  will  hold such  proceeds  in trust for the
holders of the certificates (the "Common Shares Trust").  Trenwick shall pay all
commissions, transfer taxes and other out-of-pocket transaction costs, including
the expenses and compensation of the Exchange Agent, incurred in connection with
such sale of the Excess Shares.  The Exchange Agent shall  determine the portion
of the  Common  Shares  Trust to which  each  holder of a  certificate  shall be
entitled,  if any,  by  multiplying  the amount of the  aggregate  net  proceeds
comprising the Common Shares Trust by a fraction,  the numerator of which is the
amount of the fractional share interest to which such holder is entitled and the
denominator of which is the aggregate  amount of fractional  share  interests to
which all holders of the certificates are entitled.

                           (iv) As soon as practicable  after the  determination
of the amount of cash, if any,  to  be  paid to holders of  the  certificates in
lieu of any fractional share interests,  the Exchange Agent shall make available
such amounts, without interest, to such holders of the certificates.

     (g)  Termination  of Exchange Fund and Common Shares Trust.  Any portion of
the Exchange  Fund or Common  Shares Trust which  remains  undistributed  to the
holders of the  certificates  representing  shares of Chartwell Common Stock for
180 days after the Effective  Time shall be delivered to Trenwick,  upon demand,
and any holders of shares of  Chartwell  Common  Stock who have not  theretofore
complied with this Article II shall thereafter look only to Trenwick for payment
of their claim for any Merger  Consideration  and any dividends or distributions
with respect to Trenwick Common Stock.

     (h) No  Liability.   None of Chartwell,  Trenwick  or  the  Exchange  Agent
shall be liable  to any person   in  respect of any shares,  cash,  dividends or
distributions payable from the Exchange Fund or Common Shares Trust delivered to
a public  official  pursuant to any applicable  abandoned  property,  escheat or
similar law. If any certificates  representing  shares of Chartwell Common Stock
shall not have been surrendered prior to five years after the Effective Time (or
immediately  prior to such  earlier  date on which any Merger  Consideration  in
respect of such certificate would otherwise escheat to or become the property of
any Governmental Entity (as defined in Section 3.1(d))),  any such shares, cash,
dividends or distributions  payable in respect of such certificate shall, to the
extent  permitted  by  applicable  law,  become the  property  of the  Surviving
Corporation,  free and clear of all claims or interest of any person  previously
entitled thereto.


                                       6


<PAGE>

     (i) Lost Certificates.  If any certificate  representing  Chartwell  Common
Stock  shall  have  been  lost,  stolen or  destroyed,  upon  the  making of  an
affidavit  of that fact by the  person  claiming  such  certificate  to be lost,
stolen or destroyed and, if required by the Surviving  Corporation,  the posting
by such person of a bond in such reasonable amount as the Surviving  Corporation
may  direct as  indemnity  against  any claim  that may be made  against it with
respect to such  certificate,  the  Exchange  Agent will deliver in exchange for
such lost, stolen or destroyed certificate the Merger Consideration set forth in
Section  2.1(b) with  respect to the shares of Chartwell  Common Stock  formerly
represented thereby, without any interest thereon.

     SECTION 2.3.   Tax  Consequences  of Merger. It is the intent of  Chartwell
and Trenwick and the holders  of  the  Chartwell  Common Stock and  the  holders
of the  Trenwick  Common  Stock  that the  Merger  qualify  as a  reorganization
described  in  Section  368(a)(1)  of the Code,  pursuant  to which  none of the
holders of the  Chartwell  Common  Stock or the holders of the  Trenwick  Common
Stock will recognize any gain or loss for Federal income tax purposes, except to
the extent of any cash received in lieu of fractional shares.

     SECTION 2.4.   Stock Options, Warrants and Stock Purchase Plans.

                  (a) At the Effective  Time,  each employee and director  stock
option to purchase  Chartwell Common Stock granted under any of the Stock Option
Plans (as hereinafter defined in Section 3.1(c)) outstanding as of the Effective
Time (each, a "Stock Option"), whether or not then vested or exercisable,  shall
be assumed by Trenwick  and  converted  into an option to  acquire,  on the same
terms and  conditions  as were  applicable  under such Stock Option prior to the
Effective  Time, the number (rounded down to the nearest whole number) of shares
of Trenwick  Common Stock  determined by multiplying (x) the number of shares of
Chartwell  Common Stock  subject to such Stock Option  immediately  prior to the
Effective  Time by (y) the Conversion  Number,  at a price per share of Trenwick
Common  Stock  (rounded up to the nearest  whole cent) equal to (A) the exercise
price per share otherwise  purchasable  pursuant to such Stock Option divided by
(B) the Conversion Number. At the Effective Time, each then outstanding  warrant
to purchase  Chartwell  Common  Stock (each,  a  "Warrant")  shall be assumed by
Trenwick in accordance with its terms.

                  (b) At the Effective Time,  each option to purchase  Chartwell
Common Stock under  Chartwell's  Sharesave Scheme 1997 (each, a "Sharesave Stock
Option") with respect to the 1997, 1998 and 1999 calendar years, but only to the
extent accrued to the Effective Time, whether or not then vested or exercisable,
shall be converted as of the  Effective  Time into the right to receive from the
Surviving  Corporation the number  (rounded down to the next whole number,  with
cash  to be  paid  in  lieu of any  fractional  share  eliminated  through  such
rounding)  of shares of  Trenwick  Common  Stock equal to the product of (i) the
number of shares of Chartwell  Common Stock that were subject to such  Sharesave
Stock Option  immediately  prior to its conversion  pursuant to this Section 2.4
and (ii) the  Conversion  Number,  less the number of shares of Trenwick  Common
Stock  equal  to  any  U.K.  tax  required  to  be  withheld  by  the  Surviving
Corporation. The amount of cash to be paid in lieu of fractional shares pursuant
to this Section 2.4(b) shall be determined as provided in Section 2.2(f) (iii).

                                       7

<PAGE>


                  (c)  Notwithstanding  any other provision of this Agreement to
the contrary, prior to the Effective Time Chartwell shall make any amendments to
the Stock  Option  Plans and Stock  Purchase  Plans (as  hereinafter  defined in
Section  3.1(c)) and take such other  actions,  if any, as are necessary to give
effect to the transactions contemplated by this Section.

                  (d)  Trenwick  shall take all  corporate  action  necessary to
reserve for issuance a sufficient  number of shares of Trenwick Common Stock for
delivery  pursuant to the terms set forth in this Section 2.4. At the  Effective
Time,  Trenwick  shall file with the  Securities  and Exchange  Commission  (the
"SEC") a  registration  statement  or  statements  on Form  S-8,  or such  other
appropriate  form as Trenwick may select,  with  respect to the Trenwick  Common
Stock subject to the Stock  Options  pursuant to this Section 2.4, and shall use
its reasonable best efforts to maintain the  effectiveness  of the  registration
statement and current  status of the  prospectus  relating  thereto,  as well as
comply with any applicable  state  securities or "blue sky" laws, for so long as
such Stock Options remain outstanding. The shares of Trenwick Common Stock to be
issued  pursuant to Section  2.4(b) shall be  registered  under the Form S-4 (as
hereinafter defined).

                  (e) Chartwell and Trenwick shall take all such steps as may be
required to provide that,  with respect to each Section 16 Affiliate (as defined
below), (i) the transactions  contemplated by this Article II and (ii) any other
dispositions of Chartwell equity securities (including derivative securities) or
other   acquisitions  of  Trenwick  equity  securities   (including   derivative
securities) in connection with this Agreement,  shall be exempt under Rule 16b-3
promulgated under the Securities Exchange Act of 1934, as amended (the "Exchange
Act").  For purposes of this Agreement,  "Section 16 Affiliate"  shall mean each
individual  who (x)  immediately  prior to the  Effective  Time is a director or
executive  officer  of  Chartwell  or (y) at the  Effective  Time will  become a
director or executive officer of Trenwick.

     SECTION 2.5.   Adjustments.  If at any time during  the period  between the
date   of   this   Agreement  and  the   Effective  Time,  any   change  in  the
outstanding  shares of capital  stock of  Trenwick or  Chartwell  shall occur by
reason  of any  reclassification,  recapitalization,  stock  split  combination,
exchange or  readjustment  of shares,  any stock dividend  thereon with a record
date during such period, or any similar  transaction,  the Merger  Consideration
and the adjustments to options and warrants and the payments required to be made
under Section 2.4 shall be appropriately adjusted.


                                   ARTICLE III

                         REPRESENTATIONS AND WARRANTIES

     SECTION 3.1.   Representations  and  Warranties  of  Chartwell.  Except  as
disclosed in the  Disclosure  Schedule  delivered  by  Chartwell to Trenwick  at
or  prior  to  the  execution  of  this  Agreement  (the  "Chartwell  Disclosure
Schedule") and making  reference to the particular  subsection of this Agreement
to which exception is being taken, Chartwell represents and warrants to Trenwick
as follows:

                                       8

<PAGE>

     (a)  Organization, Standing  and  Corporate  Power.  Each of  Chartwell and
its  subsidiaries  (as defined in Section 8.2(d))  is  a  corporation  or  other
legal entity duly organized, validly existing and in good standing (with respect
to jurisdictions that recognize such concept) under the laws of the jurisdiction
in which it is organized and has the requisite  corporate or other power, as the
case may be, and  authority  to carry on its  business  as now being  conducted,
except where the failure to be so organized,  existing or in good standing or to
have such  power  individually  or in the  aggregate  would not have a  Material
Adverse  Effect (as defined in Section  8.2(h)) on Chartwell.  Each of Chartwell
and its subsidiaries is duly qualified or licensed to do business and is in good
standing  (with respect to  jurisdictions  that  recognize such concept) in each
jurisdiction  in which the nature of its business or the  ownership,  leasing or
operation of its properties makes such qualification, licensing or good standing
necessary,  except for those  jurisdictions where the failure to be so qualified
or licensed or to be in good standing or to have such power  individually  or in
the aggregate would not have a Material  Adverse Effect on Chartwell.  Chartwell
has  delivered to Trenwick  complete and correct  copies of its  Certificate  of
Incorporation and By-laws and the Certificates of Incorporation and By-laws,  or
other organizational documents, of its subsidiaries,  in each case as amended to
the date of this Agreement.


     (b) Subsidiaries.  Section 3.1(b) of  the  Chartwell   Disclosure Schedule
includes all  the   subsidiaries  of  Chartwell  which as of the  date  of  this
Agreement are  Significant  Subsidiaries  (as defined in Rule 1-02 of Regulation
S-X of the SEC). All the outstanding shares of capital stock of, or other equity
interests in, each such Significant  Subsidiary have been validly issued and are
fully paid and  nonassessable and are owned directly or indirectly by Chartwell,
free and clear of all pledges, claims, liens, charges, encumbrances and security
interests of any kind or nature whatsoever (collectively, "Liens").

     (c) Capital  Structure.  The authorized capital stock of Chartwell consists
of 20,000,000 shares of Chartwell Common Stock and 5,000,000 shares of preferred
stock, par value $1.00 per share. At the close of business on June 18, 1999, (i)
9,641,854  shares of Chartwell  Common Stock were issued and  outstanding,  (ii)
zero shares of Chartwell  Common  Stock were held by Chartwell in its  treasury;
(iii)  1,471,300  shares of Chartwell  Common  Stock were  reserved for issuance
pursuant to  outstanding  Stock  Options  issued under  Chartwell's  Amended and
Restated  1993 Stock Option Plan,  1997 Omnibus  Stock  Incentive  Plan and 1996
Non-Employee  Director  Stock  Option  Plan  (collectively,  the  "Stock  Option
Plans"), (iv) 25,045 shares of Chartwell Common Stock were reserved for issuance
pursuant to the 1995 Employee  Stock  Purchase  Plan and  Sharesave  Scheme 1997
(collectively, the "Stock Purchase Plans") (including shares of Chartwell Common
Stock that were reserved for issuance  pursuant to options  granted  pursuant to
the 1995 Employee Stock Purchase Plan ("ESPP Stock Options") and Sharesave Stock
Options then  outstanding),  (v) 334,532  shares of Chartwell  Common Stock were
reserved for issuance upon the exercise of the Warrants listed in Section 3.1(c)
of  the  Chartwell  Disclosure  Schedule  and  (vi)  125,000  shares  of  Junior
Participating  Cumulative  Preferred  Stock,  par value  $1.00 per  share,  were
reserved  for  issuance  in  connection  with the rights (the  "Rights")  issued
pursuant  to  the  Rights  Agreement  dated  as of May  22,  1997  (the  "Rights
Agreement"),  between Chartwell and State Street Bank and Trust Company.  Except
as set forth  above,  at the close of  business on June 18,  1999,  no shares of
capital stock or other equity securities of Chartwell were issued,  reserved for
issuance or outstanding.  All  outstanding  shares of capital stock of Chartwell
are, and all shares which may be issued pursuant to the Stock Option Plans,  the
Stock Purchase Plans or the Warrants will be, when issued, duly authorized,

                                       9

<PAGE>

validly  issued,  fully paid and  nonassessable  and not  subject to  preemptive
rights.  Except  as set forth in  Section  3.1(c)  of the  Chartwell  Disclosure
Schedule,  since  January 1, 1999,  no shares of the capital  stock of Chartwell
have been issued  other than  pursuant to Stock  Options,  Warrants,  ESPP Stock
Options or Sharesave Stock Options already in existence on such date, and, since
such date, no Stock  Options,  Warrants,  ESPP Stock Options or Sharesave  Stock
Options  have  been  granted.  Except  as set  forth in  Section  3.1(c)  of the
Chartwell Disclosure Schedule, no bonds, debentures, notes or other indebtedness
of  Chartwell  or any  subsidiary  of  Chartwell  having  the  right to vote (or
convertible into, or exchangeable  for,  securities having the right to vote) on
any  matters  on which  the  stockholders  of  Chartwell  or any  subsidiary  of
Chartwell may vote are issued or  outstanding.  Section  3.1(c) of the Chartwell
Disclosure  Schedule  lists each  subsidiary  of Chartwell  and,  except for the
capital stock of such  subsidiaries and the other ownership  interests listed in
Section  3.1(c) of the Chartwell  Disclosure  Schedule,  Chartwell does not own,
directly or  indirectly,  any capital stock or other  ownership  interest in any
corporation,   partnership,  joint  venture  or  other  entity  other  than  any
publicly-traded  corporation  in which  Chartwell  owns 100 or fewer  shares  of
common stock. Except as disclosed in Section 3.1(c) of the Chartwell  Disclosure
Schedule,  all the  outstanding  shares of capital  stock of each  subsidiary of
Chartwell have been validly issued and are fully paid and  nonassessable and are
owned by Chartwell,  by one or more wholly owned subsidiaries of Chartwell or by
Chartwell and one or more such wholly owned subsidiaries,  free and clear of all
Liens.  Except  as set  forth  above  or in  Section  3.1(c)  of  the  Chartwell
Disclosure Schedule, there are not any securities,  options,  warrants,  rights,
commitments or agreements of any kind to which  Chartwell or any subsidiary is a
party or by which any of them is bound obligating Chartwell or any subsidiary to
issue, sell or deliver,  or repurchase,  redeem or otherwise acquire,  shares of
capital stock or other equity or voting  securities of any of them or securities
convertible  into or  exchangeable  for capital  stock or voting  securities  of
Chartwell,  or obligating any of them to issue, sell, deliver,  grant, extend or
enter into any such security,  option,  warrant, right, commitment or agreement.
Except as set forth in  Section  3.1(c) of the  Chartwell  Disclosure  Schedule,
there  are no  stockholder  agreements,  voting  trusts or other  agreements  or
understandings  to which Chartwell or any of its  subsidiaries is a party, or to
which any of them is bound,  relating to the voting or disposition of any shares
of capital stock of Chartwell or any subsidiary thereof.

     (d)  Authority;  Noncontravention.  Chartwell has all  requisite  corporate
power and authority to enter into this Agreement  and,  subject to obtaining the
Chartwell Stockholder Approval (as defined in Section 3.1(q)), to consummate the
transactions  contemplated  by  this  Agreement.  Chartwell  has  all  requisite
corporate  power and  authority to enter into the Stock Option  Agreement and to
consummate the transactions  contemplated thereby. The execution and delivery of
this Agreement and the Stock Option  Agreement by Chartwell and the consummation
by Chartwell of the  transactions  contemplated  by this Agreement and the Stock
Option Agreement have been duly authorized by all necessary  corporate action on
the part of  Chartwell,  subject to the  Chartwell  Stockholder  Approval.  This
Agreement and the Stock Option  Agreement  have been duly executed and delivered
by Chartwell and, assuming the due authorization, execution and delivery of this
Agreement and the Stock Option Agreement by Trenwick,  constitute  legal,  valid
and  binding   obligations  of  Chartwell,   enforceable  against  Chartwell  in
accordance  with their  respective  terms.  The  execution  and delivery of this
Agreement and the Stock Option  Agreement do not, and,  subject to the Chartwell
Stockholder Approval  with respect to this  Agreement, the  consummation of  the

                                       10

<PAGE>

transactions  contemplated by this Agreement and the Stock Option  Agreement and
compliance with the provisions of this Agreement and the Stock Option  Agreement
will not,  conflict  with,  or result in any  violation  of, or default (with or
without  notice  or lapse of time,  or both)  under,  or give rise to a right of
termination, cancellation or acceleration of any obligation or loss of a benefit
under,  or result in the  creation  of any Lien  upon any of the  properties  or
assets of Chartwell or any of its  subsidiaries  under,  (i) the  Certificate of
Incorporation or By-laws of Chartwell or the comparable organizational documents
of any of its  subsidiaries,  (ii) subject to the matters referred to in Section
3.1(d) of the Chartwell  Disclosure  Schedule and the matters referred to in the
sentence following the next sentence, any indenture or other material agreement,
permit,  franchise,  license  or  instrument  to which  Chartwell  or any of its
subsidiaries is a party or by which Chartwell or any of its  subsidiaries or any
of their assets is bound or affected,  or (iii) subject to the matters  referred
to in the sentence  following the next sentence,  any statute,  law,  ordinance,
rule, regulation,  order, judgment,  injunction,  decree, determination or award
applicable to Chartwell or any of its  subsidiaries  or any of their  respective
properties  or assets,  other than,  in the case of clause (ii) above,  any such
conflicts, violations, defaults, rights, losses or Liens that individually or in
the aggregate  would not (x) have a Material  Adverse Effect on Chartwell or (y)
reasonably be expected to impair  materially the ability of Chartwell to perform
its obligations  under this Agreement and the Stock Option  Agreement.  Assuming
the conditions set forth in Section 3.1(d) of the Chartwell  Disclosure Schedule
are met,  the Merger and the other  transactions  contemplated  hereby  will not
constitute a "change of control"  under the  Contingent  Interest Notes due June
30, 2006 or the Indenture dated as of December 1, 1995 (the "Contingent Interest
Notes Indenture")  between  Chartwell,  as the successor to Piedmont  Management
Company  Inc.  and State  Street Bank and Trust  Company,  as successor to Fleet
National  Bank of  Connecticut,  as Trustee.  No consent,  approval,  order,  or
authorization  of, action by or in respect of, or  registration,  declaration or
filing with any federal, state, local or foreign government, any court, tribunal
or administrative,  governmental or regulatory authority or agency or commission
or any non-governmental self-regulatory agency, commission or authority (each, a
"Governmental  Entity"),  or of the Society and Corporation of Lloyd's of London
("Lloyd's"),  is  required  by or  with  respect  to  Chartwell  or  any  of its
subsidiaries in connection with the execution and delivery of this Agreement and
the Stock Option  Agreement by Chartwell or the consummation by Chartwell of the
transactions  contemplated  hereby,  except  for  (A) in  connection  with or in
compliance   with  the  provisions  of  (1)  the   Hart-Scott-Rodino   Antitrust
Improvements  Act of 1976, as amended (the "HSR Act"), (2) the Securities Act of
1933, as amended (the "Securities Act"), (3) the Exchange Act, (4) the DGCL, (5)
the New York Stock  Exchange,  Inc.  (the  "NYSE"),  (6) any  non-United  States
competition,  antitrust and  investment  laws,  and the securities or "blue sky"
laws of the various  states,  (7) the  approvals,  filings and notices  required
under the insurance laws of the  jurisdictions in which Chartwell  transacts the
business of  insurance  or  reinsurance;  (8) the filing of the  certificate  of
merger with the Delaware  Secretary of State and appropriate  documents with the
relevant  authorities  of other  states in which  Chartwell  is  qualified to do
business,  (9) any  required  consents and waivers of Lloyd's and (B) such other
consents,   approvals,   orders,   authorizations,    actions,    registrations,
declarations, filings or notices (as may be required) the failure of which to be
made or  obtained  individually  or in the  aggregate  would not have a Material
Adverse Effect on Chartwell.

     (e) SEC Documents; Financial Statements. (i) Chartwell has timely filed all
required forms,  reports,  schedules,  statements and other documents (including
exhibits  and all other  information  incorporated  therein) with the  SEC since

                                       11

<PAGE>

January 1, 1996.  Chartwell  has  delivered  or made  available  to Trenwick all
registration statements, proxy statements, annual reports, quarterly reports and
reports on Form 8-K and other forms,  reports and  documents,  if any,  filed by
Chartwell  with the SEC  since  January  1,  1996 (as such  documents  have been
amended  since  the time of  their  filing,  collectively,  the  "Chartwell  SEC
Documents").  As of their respective dates or, if amended, as of the date of the
last such  amendment,  the  Chartwell  SEC  Documents  (i) were timely filed and
complied as to form in all material respects with the applicable requirements of
the  Securities  Act or the Exchange  Act, as the case may be, and the rules and
regulations of the SEC promulgated  thereunder  applicable to such Chartwell SEC
Documents,  and (ii) did not contain any untrue  statement of a material fact or
omit to state a material  fact  required to be stated  therein or  necessary  in
order to make the statements  therein, in light of the circumstances under which
they were  made,  not  misleading.  The  consolidated  financial  statements  of
Chartwell  included in the Chartwell  SEC  Documents  complied as to form, as of
their  respective  dates of filing with the SEC, in all material  respects  with
applicable  accounting  requirements  and the published rules and regulations of
the SEC with respect  thereto,  have been prepared in accordance  with generally
accepted accounting  principles  (except, in the case of unaudited  consolidated
quarterly  statements,  as  permitted  by Form  10-Q of the  SEC)  applied  on a
consistent  basis during the periods involved (except as may be indicated in the
notes  thereto)  and fairly  present in all material  respects the  consolidated
financial  position of Chartwell  and its  consolidated  subsidiaries  as of the
dates thereof and the  consolidated  results of their  operations and cash flows
for  the  periods  then  ended  (subject,  in the  case of  unaudited  quarterly
statements, to normal year-end adjustments).

                           (ii)   Chartwell has previously furnished to Trenwick
true  and  complete  copies  of the annual   statements  for each of  the  years
ended December 31, 1996, December 31, 1997, and December 31, 1998, together with
all exhibits and schedules thereto (collectively, the "Annual Statements"), with
respect to each of Chartwell  Reinsurance Company, The Insurance  Corporation of
New York,  Dakota Specialty  Insurance  Company and ReCor Insurance Company Inc.
(each, an "Insurer"), in each case as filed with the Governmental Entity charged
with  supervision  of insurance  companies  of such  Insurer's  jurisdiction  of
domicile (the  "Insurance  Regulator").  The Annual  Statements were prepared in
conformity with statutory  accounting  practices prescribed or permitted by such
Insurance Regulator applied on a consistent basis ("SAP") and present fairly, to
the extent required by and in conformity  with SAP in all material  respects the
statutory  financial condition of such Insurer at their respective dates and the
results of  operations,  changes in capital  and  surplus  and cash flow of such
Insurer  for each of the  periods  then  ended.  Except as set forth in  Section
3.1(e) of the  Chartwell  Disclosure  Schedule,  no  deficiencies  or violations
material  to the  financial  condition  of any  of the  Insurers,  individually,
whether or not material in the  aggregate,  have been asserted in writing by any
Insurance  Regulator  which have not been  cured or  otherwise  resolved  to the
satisfaction  of  such  Insurance  Regulator  (unless  not  currently  pending).
Chartwell  has made  available  to  Trenwick  true and  complete  copies  of all
financial  examination  reports of state insurance  departments since January 1,
1996 relating to each Insurer.  The quarterly statements of each Insurer for the
quarter  ending  March 31, 1999 as filed and the  quarterly  statements  of each
Insurer  thereafter  filed prior to the Closing,  when filed with the  insurance
regulatory  authorities  of the  applicable  states,  presented and will present
fairly,  to the extent  required by and in  conformity  with SAP in all material
respects the statutory  financial  condition of such Insurer at their respective
dates  indicated and the results of  operations,  changes in capital and surplus
and cash flow of such Insurer for each of the periods therein specified (subject
to normal year-end adjustments).


                                       12
<PAGE>

               (iii)  The Annual Report and Accounts and the Syndicate Quarterly
Reports    together  with all  exhibits  and   schedules  thereto,   of  each of
Lloyd's  Syndicates  44, 270,  544,  741/2741,  839, 947 and 994  (collectively,
"Chartwell Syndicates") as of and for each of the years ended December 31, 1996,
1997 and 1998 and for the quarter ended March 31, 1999 (x) have been prepared in
all material  respects in accordance  with the  applicable  requirements  of the
Syndicate  Accounting  Rules  of  Lloyd's  and (y)  other  than as to  Chartwell
Syndicate  947 show a true  and  fair  view in  accordance  with  the  foregoing
requirements and standards,  in all material respects of the 1996 closed year of
account profit with respect to the Chartwell Syndicates.

     (f)  Information  Supplied.  None  of  the  information  supplied  or to be
supplied by Chartwell  for  inclusion or  incorporation  by reference in (i) the
registration  statement  on Form S-4 to be filed  with  the SEC by  Trenwick  in
connection  with the issuance of Trenwick  Common Stock in the Merger (the "Form
S-4")  will,  at the time the Form S-4 is filed with the SEC,  at any time it is
amended or supplemented or at the time it becomes effective under the Securities
Act,  contain  any  untrue  statement  of a  material  fact or omit to state any
material fact required to be stated  therein or necessary to make the statements
therein, in light of the circumstances under which they are made, not misleading
or (ii) the filing with the SEC of a proxy  statement  relating to the Chartwell
Stockholder   Approval  and  the  proxy  statement   relating  to  the  Trenwick
Stockholder Approval, in each case as amended or supplemented from time to time,
(the  "Joint  Proxy  Statement")  will,  at  the  date  it is  first  mailed  to
Chartwell's  stockholders or at the time of the Chartwell  Stockholders  Meeting
(as defined in Section 5.2),  contain any untrue statement of a material fact or
omit to state any material  fact  required to be stated  therein or necessary in
order to make the statements  therein, in light of the circumstances under which
they are made, not misleading.  The Joint Proxy Statement will comply as to form
in all material respects with the requirements of the Exchange Act and the rules
and  regulations  promulgated  thereunder.  Notwithstanding  the  foregoing,  no
representation  or warranty is made by  Chartwell  in this  Section  3.1(f) with
respect to information  supplied by Trenwick for inclusion or  incorporation  by
reference in the Joint Proxy Statement.

     (g)  Absence of Certain Changes or Events  Except in  connection  with this
Agreement, the Stock Option Agreement and the transactions  contemplated hereby,
as disclosed in the Chartwell SEC Documents  filed and publicly  available prior
to the date of this  Agreement  (the  "Filed  Chartwell  SEC  Documents")  or in
Section 3.1(g) of the Chartwell Disclosure Schedule,  since the date of the most
recent  audited  financial  statements  included  in  the  Filed  Chartwell  SEC
Documents,  Chartwell and its subsidiaries  have conducted their business in the
ordinary course  consistent  with past practice,  and there has not occurred (i)
any event or change having  individually or in the aggregate a Material  Adverse
Effect on  Chartwell,  (ii) any  declaration,  setting  aside or  payment of any
dividend or other distribution (whether in cash, stock or property) with respect
to any of Chartwell's  outstanding  capital stock,  other than regular quarterly
cash  dividends of $.04 per share on the  Chartwell  Common Stock and  dividends
paid by wholly owned subsidiaries, (iii) (A) any granting by Chartwell or any of
its  subsidiaries  to any current or former  director or officer of Chartwell or
its  subsidiaries  of any  increase in  compensation,  bonus or other  benefits,
except  for  normal  increases  in the  ordinary  course of  business  or as was

                                       13

<PAGE>

required  under any  employment  agreements  or benefit  plan  listed in Section
3.1(h) of the Chartwell  Disclosure  Schedule,  (B) any granting by Chartwell or
any of its subsidiaries to any such current or former director or officer of any
increase  in  severance  or  termination  pay except as was  required  under any
agreement listed in Section 3.1(h) of the Chartwell  Disclosure  Schedule or (C)
any entry by Chartwell or any of its  subsidiaries  into, or any  amendments of,
any employment,  deferred compensation,  consulting,  severance,  termination or
indemnification  agreement with any such current or former  director or officer,
(iv)  any tax  election  that  individually  or in the  aggregate  would  have a
Material  Adverse  Effect  on  Chartwell  or any of its  tax  attributes  or any
settlement or compromise of any material income tax liability, or (v) any change
in accounting  principles  or practices by Chartwell or any of its  subsidiaries
materially  affecting their assets,  liabilities or business,  except insofar as
may have  been  required  or  permitted  by a change  in  applicable  accounting
principles (including SAP).

     (h) Benefit  Plans.  (A) (i) Each  "employee  benefit  plan" (as defined in
Section 3(3) of the Employee  Retirement Income Security Act of 1974, as amended
("ERISA"),  and each other plan, arrangement or policy, whether written or oral,
relating to stock options,  stock purchases,  stock appreciation rights,  profit
sharing,  group  insurance,  vacation  pay,  leave of absence,  dependent  care,
cafeteria  benefits,  workers  compensation,  consulting,  pension,  retirement,
compensation,  deferred  compensation,   severance,  fringe  benefits  or  other
employee benefits,  in each case maintained or contributed to, or required to be
maintained or contributed  to, by Chartwell or any of its  subsidiaries  for the
benefit of any present or former U.S. officer, employee or director of Chartwell
or  any  of  its  subsidiaries  (all  the  foregoing  collectively  referred  to
hereinafter as "Chartwell Benefit Plans") has been administered substantially in
accordance with its terms and any related trust agreement or insurance  contract
has been administered substantially in accordance with its terms. Chartwell, its
subsidiaries  and  all the  Chartwell  Benefit  Plans,  and  any  related  trust
agreements  or  insurance  contracts,  are in  substantial  compliance  with the
applicable  provisions of ERISA,  the Code,  all other  applicable  laws and all
applicable collective bargaining agreements.

                         (ii) None of  Chartwell or any other  person or entity
that together with  Chartwell is  treated as  a single  employer  under  Section
414 of the Code (each a "Chartwell Commonly Controlled Entity") has incurred any
material  liability  under  Title IV of ERISA  (other  than for the  payment  of
benefits or the timely payment of Pension Benefit Guaranty Corporation insurance
premiums,  in either case in the  ordinary  course) or under  Section  412(f) or
412(n) of the Code, and no condition  exists which could  reasonably be expected
to present a risk of Chartwell or any Commonly  Controlled Entity incurring such
a material liability.

                           (iii)   Neither Chartwell  nor any Chartwell Commonly
Controlled  Entity is  obligated  to  contribute  to  any  "multiemployer  plan"
(as defined in Section 3(37) or Section 4001(a)(3) of ERISA) or has any material
liability,  including  current or  potential  withdrawal  liability  (within the
meaning of Section 4201 of ERISA) with respect to any multiemployer plan.

                           (iv)    Except as  contemplated by Section 2.4 or as
disclosed in  the  Filed   Chartwell SEC  Documents or in  Section 3.1(h) of the
Chartwell  Disclosure  Schedule,  since  the  date of the  most  recent  audited
financial  statements  included in the Filed Chartwell SEC Documents,  there has
not been any adoption or amendment  by Chartwell or any of its  subsidiaries  of
any collective  bargaining  agreement or any Chartwell  Benefit Plan.  Except as
disclosed  in the Filed  Chartwell  SEC  Documents  or in Section  3.1(h) of the
Chartwell Disclosure Schedule, there exist no employment,  consulting, change in
control, severance,  termination or indemnification agreements,  arrangements or
understandings  between  Chartwell or any  subsidiary  and any current or former
employee,  officer or director of Chartwell or any  subsidiary  or any Chartwell
Benefit Plan.

                                       14

<PAGE>

                           (v)      Except as set forth in Section 3.1(h) of the
Chartwell Disclosure Schedule, all material  contributions  and  other  payments
required  to  be  made  by  Chartwell and  its  subsidiaries  to  any  Chartwell
Benefit Plan prior to the date hereof have been made and all  accruals  required
to be made under any Chartwell  Benefit Plan have been made.  There is no claim,
dispute,  grievance,   charge,  complaint,   restraining  or  injunctive  order,
litigation or proceeding pending, or, to the knowledge of Chartwell,  threatened
or anticipated  (other than routine claims for benefits)  against or relating to
any Chartwell  Benefit Plan or against the assets of any Chartwell  Benefit Plan
which could  reasonably be expected to result in the  imposition of any material
liability  of  Chartwell.  Neither  Chartwell  nor any of its  subsidiaries  has
communicated  generally to employees or specifically  to any employee  regarding
any future increase of benefit levels (or future creations of new benefits) with
respect to any Chartwell Benefit Plans.

                           (vi) Each Chartwell Benefit Plan can be terminated or
otherwise  discontinued  without any  liability  to Chartwell or any  subsidiary
that would  reasonably  be  expected  to have a Material  Adverse  Effect.  With
respect to each  Chartwell  Benefit  Plan  subject to Title IV of ERISA and with
respect to each plan of a Chartwell Commonly  Controlled Entity subject to Title
IV of ERISA (each a "Defined  Benefit  Plan") (i) no  termination of any Defined
Benefit  Plan has  occurred  pursuant  to which  all  liabilities  have not been
satisfied in full, and no event has occurred and no condition  exists that could
reasonably  be  expected  to  result  in  Chartwell  or any  Chartwell  Commonly
Controlled  Entity  incurring  liability  under  Title  IV  of  ERISA  or  could
constitute  grounds for  terminating any Defined Benefit Plan; (ii) each Defined
Benefit  Plan which is  subject  to Part 3 of  Subtitle B of Title I of ERISA or
Section 412 of the Code,  has been  maintained  in  compliance  with the minimum
funding  standards  of ERISA and the Code and no such  Defined  Benefit Plan has
incurred any "accumulated  funding deficiency," as defined in Section 412 of the
Code and Section 302 of ERISA,  whether or not waived;  (iii) neither  Chartwell
nor any Chartwell Commonly  Controlled Entity has sought or received a waiver of
its  funding  requirements  with  respect to any  Defined  Benefit  Plan and all
material  contributions  payable with respect to each Defined  Benefit Plan have
been timely made; (iv) no reportable  event,  within the meaning of Section 4043
of ERISA,  and no event described in Section 4062 or 4063 of ERISA, has occurred
with respect to any Defined Benefit Plan; (v) the aggregate  accumulated benefit
obligations of each Defined Benefit Plan subject to Title IV of ERISA (as of the
date of the most recent  actuarial  valuation  prepared for such Defined Benefit
Plan) do not exceed the fair market value of the assets of such Defined  Benefit
Plan (as of the date of such valuation);  and (vi) no amendment has been made to
any Defined  Benefit  Plan that has required or would  require the  provision of
security under ERISA Section 307 or Code Section 401(a)(29).


                                       15

<PAGE>

                           (vii) The execution, delivery and performance of this
Agreement  and  the   transactions  contemplated   hereby  will  not in  and  of
themselves  result in the  imposition of any federal  excise tax with respect to
any Chartwell Benefit Plan.
                           (viii) Neither Chartwell nor any subsidiary maintains
or contributes (or  has  maintained or contributed  to)  any  Chartwell  Benefit
Plan which  provides,or  has a liability to provide,  life  insurance,  medical,
severance,  or  other  employee  welfare  benefits  to  any  employee  upon  his
retirement or termination  of  employment,  except as may be required by Section
4980B of the Code.

                         (ix)    Neither Chartwell nor any of  its  subsidiaries
maintains or contributes to a  trust,  organization  or   association  described
in any  of the  Sections 501(c)(9), 501(c)(17) or 501(c)(2) of the Code.

                           (x)   Favorable   determination   letters  have  been
received  from  the  Internal  Revenue  Service  with  respect to each Chartwell
Benefit Plan which is intended to comply with the  provisions of Section  401(a)
of the Code,  and each  such  Chartwell  Benefit  Plan  complies  in form and in
operation in all material  respects with the  requirements of a "qualified plan"
under Section 401(a) of the Code.

                           (xi)  Neither  Chartwell nor any of its subsidiaries,
nor any of their respective directors, officers, employees or, to  the knowledge
of Chartwell, any other "fiduciary," as  such term is defined in Section  3(21)
of ERISA,  has any  liability for failure to comply with ERISA or the   Code for
any action or failure to act in connection with the administration or investment
of the Chartwell Benefit Plans.

                           (xii)  There  has  been  no act or acts  which  would
result in a disallowance of a deduction or  the  imposition  of a  tax  pursuant
to Section 4980B,  or with  regard  to  plan  years  beginning  before  December
31,  1988,  Section  162(i)  of the Code as in effect  immediately  prior to the
enactment  of the  Technical  and  Miscellaneous  Revenue  Act of  1988,  or any
regulations  promulgated  thereunder,  whether final,  temporary or proposed. No
event has occurred  with respect to which  Chartwell or any of its  subsidiaries
could be liable for a tax  imposed by Chapter 43 of  Subtitle A of the Code,  or
for a civil penalty or other liability under Section 502(c) or Section 501(l) of
ERISA.  Each Chartwell  Benefit Plan that is a "group health plan" as defined in
Section 607 of ERISA complies in all material  respects and has been operated in
substantial  compliance  in all respects  with Part 7 of Title I,  Subtitle B of
ERISA and Subtitle K of the Code.
                           (xiii) With respect to each of the Chartwell  Benefit
Plans, Chartwell has  delivered  to Trenwick  true  and  complete copies of: (a)
the plan documents, including any related trust agreements,  insurance contracts
or other funding arrangements,  or a written summary of the terms and conditions
of the  plan  if  there  is no  written  plan  document;  (b)  the  most  recent
determination  letter received from the Internal Revenue  Service;  (c) the most
recent IRS Form 5500;  (d) the most  recent  actuarial  valuation;  (e) the most
recent financial  statement;  (f) all material  correspondence with the Internal
Revenue  Service,  the  Department  of Labor and the  Pension  Benefit  Guaranty
Corporation  with  respect to the past three plan years other than IRS Form 5500
filings  and  PBGC  premium  payments;  and (g) the  most  recent  summary  plan
description.


                                       16

<PAGE>

                           (B)  Except  as  would  not have a  Material  Adverse
Effect on Chartwell and save as  disclosed in  Section 3.1(h) of  the  Chartwell
Disclosure  Schedule or  as  previously  disclosed  in  writing  to Trenwick and
so far as the senior  management of Chartwell UK Holding as hereinafter  defined
(and for this purpose the senior  management  means the  following  individuals:
Steven Bensinger,  Charles Myers, Jeremy Adams, Clive Daniels,  Verity Lewis and
David Marshall) are aware:

                          (i) There is no  existing  or  threatened  or pending
industrial  or  trade  dispute  involving Chartwell Holding Limited  ("Chartwell
UK Holding") or any of its subsidiaries and any of the employees of Chartwell UK
Holding or any of its  subsidiaries  and there are no facts known or which would
on  reasonable  inquiry  be  known  to  Chartwell  UK  Holding  or  any  of  its
subsidiaries  which might indicate that there may be any such dispute (excluding
the Merger and the transactions  contemplated by this  Agreement).  There are no
agreements or arrangements  (whether oral or in writing or existing by reason of
custom and practice  and whether or not legally  binding)  between  Chartwell UK
Holding  or any of its  subsidiaries  and any  trade  union or other  employees'
representatives  or  organization  concerning  or  affecting  the  employees  of
Chartwell UK Holding or any of its subsidiaries and there are no trade unions or
other  employees'  representatives  whom  Chartwell  UK  Holding  or  any of its
subsidiaries recognizes to any extent for collective bargaining purposes nor, so
far as each of Chartwell UK Holding and its subsidiaries is aware, has Chartwell
UK Holding or any of its  subsidiaries  done any act which might be construed as
recognition.

                           (ii)   Neither   Chartwell   UK   Holding   nor   its
subsidiaries  has  given notice  of any redundancie  to  the U.K.   Secretary of
State nor started  consultations  with any independent trade union or employees'
representatives  within the  preceding  period of one year in relation to any of
employees of Chartwell UK Holding or any of its  subsidiaries.  No circumstances
have  arisen  under which  Chartwell  UK Holding or any of its  subsidiaries  is
likely  to be  required  to pay  damages  for  wrongful  dismissal  or breach of
contract, to make any contractual or statutory redundancy payment or make or pay
any compensation in respect of unfair dismissal, to make any other payment under
any  employment  protection  legislation or to reinstate or re-engage any former
employee.  No circumstances  have arisen under which Chartwell UK Holding or any
of its subsidiaries is likely to be required to pay damages or compensation,  or
suffer any penalty or be required to take corrective action or be subject to any
form of discipline  under the  Employment  Rights Act 1996,  the Trade Union and
Labour  Relations   (Consolidation)  Act  1992,  the  Transfer  of  Undertakings
(Protection of Employment)  Regulations 1981, the Sex  Discrimination  Act 1975,
the Equal Pay Act 1970,  the Treaty of Rome or any  Directive or  recommendation
made  pursuant  to  it,  the  Race   Relations   Act  1976  or  the   Disability
Discrimination  Act  1995.  So far as  each  of  Chartwell  UK  Holding  and its
subsidiaries is aware, there are no current, pending or threatened claims of any
type against  Chartwell UK Holding or any of its subsidiaries by any existing or
former employees or directors of Chartwell UK Holding or any of its subsidiaries
or by any existing or former  consultants  to Chartwell UK Holding or any of its
subsidiaries.

                                       17

<PAGE>

                           (iii)  There  are  no   existing   service  or  other
agreements   or   contracts  between  Chartwell  UK   Holding  or  any   of  its
subsidiaries and any of its directors or executives or employees which cannot be
lawfully  terminated by six calendar  months' notice or less without giving rise
to any claim for  damages  or  compensation  other than a  statutory  redundancy
payment or a claim for unfair  dismissal  depending on the  circumstances of the
termination. Each of Chartwell UK Holding and its subsidiaries has complied with
all its  material  obligations  under  all  legislation,  regulations  and other
requirements having the force of law (including,  without limitation, orders and
awards) in connection with its employees, directors and consultants.

                           (iv)  Neither  Chartwell  UK  Holding  nor any of its
subsidiaries  is involved in   negotiations  (whether  with   employees  or  any
trade  union  or  other  employees'  representatives)  to  vary  the  terms  and
conditions of employment  or  engagement of any of its  employees,  directors or
consultants and has not made any representations,  promises, offers or proposals
to any of its employees, directors or consultants or to any trade union or other
employees'  representatives  concerning or affecting the terms and conditions of
employment or engagement of any of its employees, directors or consultants.

                          (v)  Each of Chartwell UK Holding and its subsidiaries
has  discharged  its  obligations in full in relation to salary,  wages, fees,
commission,  bonuses, overtime pay, holiday pay, sick pay and all other benefits
and emoluments  relating to its employees,  consultants and directors in respect
of all prior periods.

                           (vi)  There  are  no  pension,  share  option,  share
incentive, life assurance,  disability  or  similar  schemes,   arrangements  or
obligations for any employees or directors of Chartwell UK Holding or any of its
subsidiaries,  and neither  Chartwell UK Holding nor any of its subsidiaries has
obligations  (whether  legally  binding  or  established  by  custom) to pay any
pension or make any other  payment  after  retirement  or death or  otherwise to
provide "relevant benefits" within the meaning of section 612 of the U.K. Income
and  Corporation  Taxes  Act  1988 or to make any  payment  for the  purpose  of
providing such "relevant  benefits" to or in respect of any person who is now or
has  been  an  officer  or  employee  of  Chartwell  UK  Holding  or  any of its
subsidiaries  and is not a party to any  scheme  or  arrangement  having  as its
purpose or one of its purposes the making of such  payments or the  provision of
such benefits.

                           (vii) All Retirement Benefits Schemes comply with and
have  at  all times  complied  with  the provisions of the relevant  legislation
and the requirements of the Pension Schemes Office and the Contributions  Agency
affecting  schemes  approved under Chapter I of Part XIV of the U.K.  Income and
Corporation  Taxes Act 1988.  Each of Chartwell UK Holding and its  subsidiaries
and the  trustees  of such  schemes  have duly  complied  with their  respective
obligations  under  the  trust  deeds  and  the  rules  thereof  and  under  the
aforementioned  legislation and requirements,  except that the accounts prepared
to 31 December  1997 may not conform to the  requirements  of the  Pensions  Act
1995.  All amounts due to the trustees  thereof or to any  insurance  company in
connection therewith have been paid.

                           (viii)  Neither  Chartwell  UK Holding nor any of its
subsidiaries   nor  the  trustees  of any  pension  scheme  is   engaged  in any
litigation or  arbitration  proceedings  in respect of any  Retirement  Benefits
Scheme or any benefit provided thereunder in relation to the employees or former
employees of Chartwell  UK Holding or any of its  subsidiaries  and there are no
current   submissions  or  referrals  to  the  Pensions   Ombudsman  or  to  the
Occupational Pensions Advisory Service in respect of Chartwell UK Holding or any
of its subsidiaries or any pension scheme.

                                       18

<PAGE>


                           (ix) No Retirement Benefits Scheme in which employees
or former  employees  of   Chartwell   UK Holding or  any  of  its  subsidiaries
participate or have  participated  has been or is in the process of being (or is
proposed  to be) wound up (in whole or in part) or  closed to new  entrants  (in
whole or in part).

          (i)  Taxes.      (i)  Chartwell is the common  parent of an affiliated
group  of  corporations  (within  the  meaning of  Section 1504(a)  of the Code)
eligible to file consolidated  federal income tax returns,  of which each of the
subsidiaries that is an includible corporation under Section 1504(b) of the Code
is a member;

                           (ii) except as set forth in Section 3.1(i)(ii) of the
Chartwell  Disclosure  Schedule,  Chartwell  and  each of  its subsidiaries have
filed (or joined in the filing of) when due all material tax returns required by
applicable law to be filed with respect to Chartwell or any of the  subsidiaries
and all taxes shown to be due on such tax returns have been paid;

                           (iii) all such tax  returns  were true,  correct  and
complete as of the time of such filing;

                           (iv) all material taxes relating to periods ending on
or before the  Effective  Time  owed  by Chartwell  or any  of its  subsidiaries
(whether  or not shown on any  tax return) or  to  which  Chartwell  or  any  of
its  subsidiaries  may be liable under  Treasury  Regulations  ss.  1.1502-6 (or
analogous state or foreign  provisions) by virtue of having been a member of any
"affiliated group" (or other group filing on a combined or unitary basis) at any
time on or prior to the Effective Time, if required to have been paid, have been
paid (except for taxes which are being contested in good faith);

                           (v)      any  liability  of  Chartwell or any of its
subsidiaries  for  material  taxes  not  yet due and payable, or which are being
contested in good faith,  has been provided for on the  financial  statements of
Chartwell in accordance with generally accepted accounting principles;

                           (vi)     except  as set forth in Section 3.1 (i)(vi)
of the  Chartwell  Disclosure  Schedule, there  is  no action, suit, proceeding,
investigation, audit or claim now pending against, or with respect to, Chartwell
or any of its subsidiaries in respect of any material tax or assessment,  nor is
any claim for additional tax or assessment asserted by any tax authority;

                           (vii)   since January 1, 1991, no claim has been made
by  any  tax  authority  in a  jurisdiction   where  Chartwell   or any  of  its
subsidiaries  does not currently  file a tax return that it is or may be subject
to any material tax by such  jurisdiction,  nor to Chartwell's  knowledge is any
such assertion threatened;


                                       19

<PAGE>

                           (viii)   except  as set forth in Section 3.1(i)(viii)
of  the  Chartwell  Disclosure  Schedule,  there is  no  outstanding  request by
Chartwell or any of its  subsidiaries  for any extension of time within which to
pay any taxes or file any tax returns;

                           (ix)     except as set forth in Section 3.1(i)(ix) of
the  Chartwell  Disclosure  Schedule, there has been no waiver  or  extension of
any applicable  statute of  limitations  for the assessment or collection of any
taxes of Chartwell or any of its subsidiaries;

                           (x)      no  property  of  Chartwell or  any  of  its
subsidiaries is "tax-exempt use  property" within the  meaning of Section 168(h)
of the Code;

                           (xi) neither Chartwell nor any of its subsidiaries is
a party to any lease made  pursuant to former  Section 168(f)(8) of the Internal
Revenue Code of 1954;

                           (xii) no excess loss  account  (within the meaning of
Treasury Regulations  ss. 1.1502-19)  exists with respect to any of Chartwell's
subsidiaries;

                           (xiii) neither  Chartwell nor any of its subsidiaries
has any deferred gain or loss arising from any intercompany transactions, within
the meaning of Treasury Regulations ss. 1.1502-13;

                           (xiv) neither  Chartwell nor any of its  subsidiaries
has filed any agreement or consent under Section 341(f) of the Code;

                           (xv) except as set forth in Section 3.1(i)(xv) of the
Chartwell Disclosure Schedule, neither Chartwell nor  any of  its  subsidiaries
is a party to any  agreement,  whether  written or unwritten, providing for the
payment of taxes, payment  for  tax  losses, entitlements to refunds or similar
tax matters;
                           (xvi) no ruling with  respect to taxes  (other than a
request for determination of the status of a qualified pension plan) has been
requested by or on behalf of Chartwell or any of its subsidiaries;

                           (xvii) neither  Chartwell nor any of its subsidiaries
has been a United States real property holding corporation within the meaning of
Section 897(c)(2) of the Code during the applicable period specified in Section
897(c)(1)(A)(ii) of the Code;

                           (xviii)  Chartwell and each of its subsidiaries  have
withheld and paid all material taxes required to be withheld in connection  with
any amounts paid or owing to any employee,  creditor, independent contractor  or
other third party;

                           (xix) neither  Chartwell nor any of its  subsidiaries
has taken any action or knows of any fact, agreement, plan or other circumstance
that is  reasonably  likely  to  prevent   the  Merger  from   qualifying   as a
reorganization within the meaning of Section 368(a) of the Code; and

                                       20

<PAGE>

                           (xx) As used in this Agreement, "taxes" shall include
all (x) federal, state, local  or  foreign  income,  premium,  property,  sales,
excise and other taxes or  similar governmental charges, including any interest,
penalties or  additions with respect  thereto,  (y) liability  for  the  payment
of any amounts of the type  described in (x) as a result of being a member of an
affiliated,  consolidated,  combined or unitary group, and (z) liability for the
payment of any amounts as a result of being  party to any tax sharing  agreement
or as a result of any  express  or implied  obligation  to  indemnify  any other
person  with  respect to the  payment of any  amounts of the type  described  in
clause (x) or (y).

          (j) No Excess Parachute Payments; Section 162(m)of the Code. (i)Except
as  disclosed  in Section 3.1(j) of  the  Chartwell  Disclosure  Schedule,  none
of the transactions contemplated by this Agreement shall constitute a triggering
event  under  any  employment,  severance  or  termination  agreement  or  other
compensation arrangement or Benefit Plan currently in effect which (either alone
or upon the occurrence of any additional or subsequent  event) could  reasonably
be  expected  to result in any  payment,  acceleration,  vesting or  increase in
benefits to any current or former officer,  employee or director of Chartwell or
any of its subsidiaries and which would constitute an "excess parachute payment"
(as such term is defined in Section 280G(b)(1) of the Code); and

                           (ii)    Except as disclosed in Section 3.1(j) of the
Chartwell  Disclosure  Schedule,  the   disallowance   of  a   deduction   under
Section  162(m)  of the Code for  employee  remuneration  will not  apply to any
amount paid or payable by Chartwell  or any  subsidiary  of Chartwell  under any
contract,   Chartwell  Benefit  Plan,  program,   arrangement  or  understanding
currently in effect.


          (k)  Compliance  with  Applicable Laws. Chartwell and its subsidiaries
have in full  force and  effect  all  approvals,  authorizations,  certificates,
consents,  filings,  franchises,  licenses,  notices,  permits and rights of all
Governmental Entities (including Insurance Regulators) (collectively, "Permits")
necessary for them to own,  lease or operate  their  respective  properties  and
assets and to carry on their respective business as now conducted, and there has
occurred no default under any such Permit,  except for failures of Permits to be
in full force and effect and for defaults under Permits which individually or in
the aggregate would not have a Material  Adverse Effect on Chartwell.  Except as
disclosed in the Filed Chartwell SEC Documents,  Chartwell and its  subsidiaries
are in  compliance  with  all  applicable  statutes,  laws,  ordinances,  rules,
regulations and orders of any Governmental Entity, except for such noncompliance
which  individually or in the aggregate would not have a Material Adverse Effect
on  Chartwell.  Chartwell  and  its  subsidiaries  are in  compliance  with  all
applicable   recommendations   and  requirements  of  the  Underwriting   Agency
Department of Lloyd's,  except for such  noncompliance  which individually or in
the aggregate would not have a Material Adverse Effect on Chartwell.

          (l) Litigation. Except as disclosed in the Chartwell SEC Documents or
in Section 3.1(l)  of  the Chartwell  Disclosure   Schedule,   there is no suit,
action,  proceeding  or  arbitration  (excluding  those  arising in the ordinary
course of business  relating to policies of insurance or reinsurance  written by
Chartwell  and its  subsidiaries)  pending or, to the  knowledge  of  Chartwell,
threatened  against or affecting  Chartwell or any of its subsidiaries or any of
their  respective  properties  or assets that  individually  or in the aggregate
could reasonably be expected to (i) have a Material Adverse Effect on Chartwell,
(ii)  impair the ability of  Chartwell  to perform  its  obligations  under this
Agreement  or  (iii)  prevent  the  consummation  of  any  of  the  transactions
contemplated  by this  Agreement,  nor is  there  any  judgment,  writ,  decree,
injunction or order of any Governmental Entity or arbitrator outstanding against
Chartwell  or any of its  subsidiaries  having,  or which  could  be  reasonably
expected to have any such effect.

                                       21

<PAGE>

          (m) No Undisclosed Liabilities. Except (i)  as  disclosed  in  Section
3.1(m) of the Chartwell Disclosure Schedule,  (ii) as  disclosed  in  the  Filed
Chartwell SEC Documents, (iii) obligations for losses, loss adjustment expenses,
unearned  premiums and  reinsurance  premiums  under  reinsurance  and insurance
contracts entered into by Chartwell and its subsidiaries and (iv) as a result of
any transaction set forth in Section 4.1 of the Chartwell Disclosure Schedule or
which has been  approved  in  writing  by  Trenwick,  none of  Chartwell  or its
subsidiaries  has any  liabilities or obligations of any nature,  whether or not
accrued,  contingent or otherwise,  and whether due or to become due or asserted
or unasserted  which,  individually  or in the aggregate,  would have a Material
Adverse Effect on Chartwell.

          (n)  Reserves.   (i)  All  reserves  for  claims,  losses  (including,
without  limitation,  incurred  but  not  reported losses) and  loss  adjustment
expenses (whether allocated or unallocated) as reflected in the Annual Statement
of each Insurer for each of the years ended December 31, 1996, December 31, 1997
and December 31, 1998, together with all exhibits and schedules thereto (a) were
determined in accordance with SAP and commonly accepted actuarial  standards and
principles  consistently applied and were fairly stated in accordance with sound
actuarial  principles  specified by the Actuarial  Standards Board, (b) meet the
requirements of all applicable  insurance laws,  rules,  and regulations of each
applicable  jurisdiction  in all  material  respects,  and  (c)  were  based  on
actuarial assumptions which were in accordance with those called for in relevant
policy and contract  provisions,  and such reserves made reasonable provision in
the  aggregate to cover the total amount of  liabilities  under all  outstanding
policies and  contracts of insurance,  reinsurance  and  retrocession  as of the
dates of such statutory  statements (it being understood that no  representation
or warranty is made in this  Agreement to the effect that such  reserves were in
fact adequate to cover the actual amount of such liabilities that are eventually
paid after the date thereof).  Each Insurer owns assets that qualify as admitted
assets under  applicable  insurance  laws and  regulations in an amount at least
equal to all such  required  reserves  plus its  minimum  statutory  capital and
surplus as required under applicable  insurance laws, rules and regulations.  No
Insurer's  reserves  have been  discounted  on either a tabular  or  non-tabular
basis.

                           (ii)   All net reserves for claims, losses (including
without  limitation,  incurred  but not  reported  losses)  and  loss adjustment
expenses  (whether  allocated  or  unallocated)  held with  respect to Chartwell
Syndicates  as reflected in the audited  financial  statements  of Chartwell for
each of the  years  ended  December  31,  1997 and  December  31,  1998 (a) were
determined in accordance with GAAP and commonly accepted actuarial standards and
principles  consistently applied and were fairly stated in accordance with sound
actuarial  principles  specified by the Actuarial  Standards  Board and (b) were
based on actuarial assumptions which were in accordance with those called for in
relevant  policy and contract  provisions,  and such  reserves  made  reasonable
provision in the  aggregate to cover the total amount of  liabilities  under all
outstanding policies and contracts of insurance, reinsurance and retrocession as
of the dates of such audited  financial  statements (it being understood that no
representation  or  warranty is made in this  Agreement  to the effect that such
reserves were in fact  adequate to cover the actual  amount of such  liabilities
that are eventually paid after the date thereof).


                                       22

<PAGE>

     (o)  Insurance  Issued.  Except  as  disclosed  in Section  3.1(o)  of  the
Chartwell Disclosure Schedule:

                           (i)    All in-force primary insurance policies issued
by any Insurer are, to the extent  required  under  applicable  insurance  laws,
rules or regulations, on forms and at rates approved by the insurance regulatory
authority  of the  jurisdiction  where  issued or have been  filed  with and not
objected to by such authority  within the period provided for objection,  except
as would not  individually or in the aggregate have a Material Adverse Effect on
Chartwell.

                           (ii) To the knowledge of  Chartwell,  except as would
not  individually  or  in  the  aggregate  have  a  Material  Adverse  Effect on
Chartwell,  each insurance agent or solicitor,  including,  without  limitation,
salaried  employees of  Chartwell or any Insurer  appointed by any Insurer as an
insurance agent or solicitor,  at the time such agent or solicitor wrote,  sold,
solicited or produced  business for such Insurer since January 1, 1996, was duly
licensed  as an  insurance  agent  (for  the  type of  business  written,  sold,
solicited or produced by such  insurance  agent or  solicitor in the  particular
jurisdiction in which such agent or solicitor wrote, sold, solicited or produced
such business).

     (p)  Opinion  of  Financial Advisor. Chartwell has received the opinion  of
Goldman,  Sachs & Co. dated as of the date  of  this   Agreement to  the  effect
that the  Conversion  Number is fair to the  stockholders  of  Chartwell  from a
financial point of view.

     (q) Voting  Requirements.  The affirmative  vote of  holders  of a majority
of the shares of  Chartwell  Common   Stock   (with  each  share  of  Chartwell
Common Stock having one vote per share) to approve and adopt this  Agreement and
the  Merger  (the  "Chartwell  Stockholder  Approval")  is the only  vote of the
holders of any class or series of the capital  stock of  Chartwell  necessary to
approve  and  adopt  this   Agreement  and  the  Merger  and  the   transactions
contemplated hereby.

     (r) Rights  Agreement;  Section 203.  Chartwell and its Board of Directors
have amended  the  Rights  Agreement  (without  redeeming  the  Rights) so that
the execution and delivery of this Agreement,  the Stock  Option  Agreement  or
the  consummation  of the Merger  will not (i) cause any of the Rights to become
exercisable,  (ii) cause  Trenwick to be an Acquiring  Person (as defined in the
Rights  Agreement) or (iii) trigger  other  provisions of the Rights  Agreement,
including  giving  rise  to a  Distribution  Date  (as  defined  in  the  Rights
Agreement),  and the Expiration Date (as defined in the Rights Agreement) of the
Rights shall occur immediately prior to the Effective Time. Such amendment shall
be in full force and effect from and after the date hereof.  Chartwell has taken
all  corporate  action  necessary  to render  inapplicable  to the Merger,  this
Agreement,  the Stock Option Agreement and the other  transactions  contemplated
hereby, the provisions of Section 203 of the DGCL.


                                       23
<PAGE>

     (s) Brokers.  No broker,  investment banker,  financial  advisor  or  other
person,  other than   Goldman,  Sachs & Co.,  the  fees and  expenses  of  which
will be paid by  Chartwell,  is entitled to any  broker's,  finder's,  financial
advisor's or other similar fee or commission in connection with the transactions
contemplated by this Agreement based upon  arrangements  made by or on behalf of
Chartwell.  Except as set forth in Section  3.1(s) of the  Chartwell  Disclosure
Schedule,  Chartwell has  furnished to Trenwick true and complete  copies of all
agreements   under  which  any  such  fees  or  expenses  are  payable  and  all
indemnification and other agreements related to the engagement of the persons to
whom such fees are payable.

     (t)  No Default.   Except as disclosed in the Chartwell SEC Documents, the
business of Chartwell and each of  its   subsidiaries  is  not  being  conducted
in  default  or  violation  of any  term,  condition  or  provision  of (i)  its
respective  certificate of  incorporation  or by-laws or similar  organizational
documents,  or (ii) any company  agreement,  excluding from the foregoing clause
(ii),  defaults or violations  that would not have a Material  Adverse Effect on
Chartwell or would not materially  impair the ability of Chartwell to consummate
the Merger or the other transactions contemplated hereby.

     (u) Related  Party  Transactions.  Except as set forth  in  Section 3.1(u)
of  the   Chartwell   Disclosure   Schedule,   all   transactions,   agreements,
arrangements  or   understandings   between  Chartwell  or  any  of  Chartwell's
subsidiaries,   on  the  one  hand,  and  Chartwell's   affiliates  (other  than
wholly-owned  subsidiaries  of Chartwell) or other  Persons,  on the other hand,
that are required to be disclosed in the  Chartwell  SEC Documents in accordance
with Item 404 of Schedule S-K under the  Securities  Act have been so disclosed.
Since March 31, 1999, there have been no transactions,  agreements, arrangements
or understandings between Chartwell or any of its subsidiaries, on the one hand,
and Chartwell's  affiliates (other than wholly-owned  subsidiaries of Chartwell)
or other Persons,  on the other hand,  that would be required to be disclosed in
future  public  filings  under the Exchange Act pursuant to such Item which have
not already been  disclosed in the Chartwell  SEC  Documents  filed prior to the
date hereof.

     (v)  Title to  Property.  (i)     Except  as set  forth in  Section  3.1(v)
of the Chartwell  Disclosure  Schedule,  Chartwell  and  its subsidiaries  have
good and valid title to, have valid leasehold  interests in or valid contractual
rights to use, all of the assets, tangible and intangible,  used by or necessary
for the conduct of, their  business,  except where the failure to have such good
and valid title,  valid leasehold  interests or such valid contractual rights do
not,  individually  or in the  aggregate,  have a  Material  Adverse  Effect  on
Chartwell.

                              (ii)     Except as set forth in Section 3.1(v)  of
 the Chartwell Disclosure Schedule, Chartwell and its subsidiaries:

                                    (a) own and have good and  marketable  title
                  in fee simple to the real property  owned by such party,  free
                  and  clear  of  all  mortgages,   pledges,   liens,   charges,
                  encumbrances, defects, security interests, claims, options and
                  restrictions of all kind except for (y) minor imperfections of
                  title, easements and rights of way, none of which individually
                  or in the aggregate,  materially detracts from the value of or
                  impairs  the  use of the  affected  property  or  impairs  the
                  operations  of  Chartwell or any of its  subsidiaries  and (z)
                  liens for current taxes not yet due and payable;

                                       24

<PAGE>

                                    (b)   is   in   peaceful   and   undisturbed
                  possession  of the space and/or  estate under each lease under
                  which it is a tenant, and there are no material defaults by it
                  as tenant thereunder; and

                                    (c) has good and valid rights of ingress and
                  egress  to and from all the real  property  owned or leased by
                  such party from and to the public street systems for all usual
                  street, road and utility purposes.

     (w)   Environmental.   (i) Chartwell and its subsidiaries are  in material
compliance with all applicable Environmental Laws.

                           (ii) To the knowledge of Chartwell, no  facts,  event
or conditions with respect to the operation  of its  business  or  the  business
of its  subsidiaries,  or the  locations of those  businesses  exist which could
reasonably be expected to interfere with or prevent  continued  compliance with,
or could give rise to any liability  (including,  without limitation,  liability
for clean up costs,  personal  injury or property  damage) or form the basis for
any  claim,  action,  suit,  proceeding,  hearing  or  investigation  against or
involving  Chartwell or any of its subsidiaries or their respective  businesses,
under any applicable Environmental Law.

                           (iii)  Chartwell  and  its   subsidiaries   have  not
received any written  notice,  report  or  other   information   regarding  any
actual or alleged violation of, or liability under,  Environmental Laws relating
to Chartwell or its  subsidiaries,  or the  locations of the  operation of their
businesses, which violation or liability could have a Material Adverse Effect on
Chartwell.
                           (iv) There is no action,  suit, claim,  proceeding or
investigation pending, or to the knowledge of  Chartwell,   threatened   against
Chartwell or its  subsidiaries  that alleges or would  allege any  violation  of
any applicable Environmental Laws.

                           (v)  To the knowledge of Chartwell, neither Chartwell
nor  its  subsidiaries  has ever  generated,  transported,  treated,  stored  or
disposed of any  Hazardous  Material at any site,  location or facility,  and no
such  Hazardous  Material  is present on, in or under any  location  occupied by
Chartwell or its subsidiaries, including without limitation, containment of such
Hazardous Material by means of any underground storage tank.

                           Notwithstanding  the  foregoing, this Section 3.1(w)
does not include any representation or warranty with respect  to   Chartwell  or
any of its  subsidiaries  arising in their  respective  capacities as  reinsurer
or issuer of any insurance product.

          (x) Chartwell  Investees.  Section 3.1(x) of the Chartwell  Disclosure
Schedule sets forth a list of certain  corporations  and  other  entities  other
than publicly  traded  companies  (collectively,  the "Chartwell  Investees") in
which Chartwell or a subsidiary has made an equity investment, and indicates the
percentage of the voting equity interests and total ownership  interests in such
Chartwell Investees held by Chartwell and its subsidiaries as of the date hereof
(collectively,  the  "Chartwell  Investee  Interests").  Except as  disclosed in
Section  3.1(x)  of the  Chartwell  Disclosure  Schedule,  to the  knowledge  of
Chartwell, all Chartwell Investee Interests are fully paid and nonassessable and
are owned by Chartwell, by one or more subsidiaries of Chartwell or by Chartwell
and one or more subsidiaries,  free and clear of all Liens.  Except as disclosed
in Section  3.1(x) of the  Chartwell  Disclosure  Schedule,  to the knowledge of
Chartwell,  neither Chartwell nor any of its subsidiaries is a party to or bound
by any  agreement,  proxy or  other  arrangement  restricting  the  transfer  or
affecting the voting of any Chartwell Investee Interest.  Except as disclosed in
Section 3.1(x) of the Chartwell Disclosure  Schedule,  the executive officers of
Chartwell do not know, without inquiry,  of any representation and warranty made
with respect to a subsidiary  of  Chartwell in Sections  3.1(d),  (k) and (l) of
this Agreement which would not be true and correct in all material respects (or,
with respect to those  representations  and warranties  that are qualified as to
materiality, true and correct) if the Chartwell Investees were each considered a
subsidiary of Chartwell for purposes of such representation and warranty, except
for such  failures to be true and correct in all material  respects (or true and
correct,  as  applicable)  which  would not  reasonably  be  expected  to have a
Material Adverse Effect on Chartwell.

                                       25

<PAGE>

          (y)  Reinsurance Contracts, Coverholders  and MGAs. (i) Section 3.1(y)
of the Chartwell  Disclosure  Schedule contains a  true  and  complete  list  of
all managing general agents of the Insurers (collectively, "MGAs"), coverholders
with respect to the Chartwell Syndicates  ("Coverholders") with whom any Insurer
or Chartwell does business and all in force contracts, treaties or arrangements,
regarding ceding of reinsurance, coinsurance, excess insurance, or retrocession,
(collectively,  "Reinsurance  Contracts")  to which  any  Insurer  or  Chartwell
Syndicate is a party as the cedent  thereunder or by or to which any of them are
bound or subject as the cedent thereunder, as each such Reinsurance Contract may
have been amended,  modified or supplemented.  Except as would not, individually
or in the aggregate,  have a Material  Adverse Effect on Chartwell:  (i) each of
the foregoing  Reinsurance Contracts is valid and binding in accordance with its
terms, and is in full force and effect and (ii) none of the Insurers or Plaza Co
Syndicates  nor, to the  knowledge of Chartwell any other party  thereto,  is in
default in any material respect with respect to any such  Reinsurance  Contract,
nor to the knowledge of Chartwell  does any condition  exist that with notice or
lapse of time or both  would  constitute  such a  material  default  thereunder.
Except as set forth in Section 3.1(y) of the Chartwell Disclosure Schedule, none
of the contracts,  treaties or  arrangements  involving the MGAs or Coverholders
contain "change of control" provisions and no such Reinsurance Contract contains
any provision providing that any such other party thereto may terminate,  cancel
or commute the same by reason of the transactions contemplated by this Agreement
or any other provision which would be altered or otherwise become  applicable by
reason  of such  transactions,  and no party has  given  notice of  termination,
cancellation or commutation of any such Reinsurance  Contract or that it intends
to terminate, cancel or commute any such Reinsurance Contract as a result of the
transactions contemplated hereby; and

                           (ii)    Except as set forth in Section 3.1(y) of  the
Chartwell  Disclosure  Schedule,  each of  the   Insurers  is   entitled   under
applicable insurance laws, rules and regulations to take credit in its statutory
financial  statements  in  accordance  with  Chapter  22 of the NAIC  Accounting
Practices and Procedures Manual for Property and Casualty Insurance Companies as
in effect on the date hereof with respect to the Reinsurance Contracts listed in
Section  3.1(y) of the  Chartwell  Disclosure  Schedule and all such amounts are
properly reflected in the statutory financial  statements of each Insurer.  Each
of Chartwell and the Insurers has no knowledge of any disputes as to reinsurance
or  retrocessional  coverage  under,  or any terms or  provisions  of,  any such
Reinsurance  Contract.  To the  knowledge of  Chartwell  and each  Insurer,  the
financial  condition of any other party to any such Reinsurance  Contract is not
impaired to the extent that a default thereunder could reasonably be expected to
occur.

                                       26

<PAGE>

     (z)  Reinsurance  Agreement. Chartwell has obtained on or prior to the date
of this  Agreement  an  underwriting  commitment  in  the  form  set   forth  in
Section  3.1(z)  of  the  Chartwell  Disclosure  Schedule  with  respect  to the
Reinsurance Agreement.

     SECTION 3.2. Representations and Warranties of Trenwick.Except as disclosed
in the Disclosure Schedule delivered by Trenwick to Chartwell at or prior to the
execution of this  Agreement  (the  "Trenwick  Disclosure  Schedule") and making
reference to the particular  subsection of this Agreement to which  exception is
being taken, Trenwick represents and warrants to Chartwell as follows:

     (a)   Organization,  Standing   and   Corporate  Power.  Each of  Trenwick
and its  subsidiaries   (as defined  in Section  8.2(d))  is  a  corporation  or
other legal entity duly organized,  validly  existing and in good standing (with
respect to  jurisdictions  that  recognize  such concept)  under the laws of the
jurisdiction  in which it is organized and has the requisite  corporate or other
power,  as the case may be, and  authority to carry on its business as now being
conducted,  except  where the  failure to be so  organized,  existing or in good
standing or to have such power individually or in the aggregate would not have a
Material  Adverse  Effect (as defined in Section  8.2(h)) on  Trenwick.  Each of
Trenwick and its  subsidiaries  is duly qualified or licensed to do business and
is in good standing (with respect to jurisdictions  that recognize such concept)
in each  jurisdiction  in which the  nature of its  business  or the  ownership,
leasing or operation of its properties  makes such  qualification,  licensing or
good standing necessary,  except for those jurisdictions where the failure to be
so  qualified  or  licensed  or to be in good  standing  or to have  such  power
individually  or in the aggregate  would not have a Material  Adverse  Effect on
Trenwick. Trenwick has delivered to Chartwell complete and correct copies of its
Certificate of  Incorporation  and By-laws and the Certificates of Incorporation
and By-laws, or other  organizational  documents,  of its subsidiaries,  in each
case as amended to the date of this Agreement.

     (b) Subsidiaries.  Section 3.2(b)  of  the  Trenwick  Disclosure  Schedule
includes  all the  subsidiaries  of  Trenwick  which  as  of  the date  of  this
Agreement are Significant  Subsidiaries.  All the outstanding  shares of capital
stock of, or other equity  interests in, each such  Significant  Subsidiary have
been validly issued and are fully paid and  nonassessable and are owned directly
or indirectly by Trenwick, free and clear of Liens.

     (c) Capital  Structure.  The authorized capital stock of Trenwick  consists
of 30,000,000 shares of Trenwick Common Stock and 2,000,000  shares of preferred
stock,  par value $.10 per share. At the close of business on June 18, 1999, (i)
10,630,510  shares of Trenwick  Common  Stock were issued and  outstanding,  (i)
1,071,170 shares of Trenwick Common Stock were reserved for issuance pursuant to
outstanding  stock options  ("Trenwick  Stock Options")  issued under Trenwick's
1989  Stock  Plan,  1993  Stock  Option  Plan and  1993  Stock  Option  Plan for
Non-Employee  Directors  all  currently in effect  (collectively,  the "Trenwick
Stock  Option  Plans"),  (ii) zero shares of Trenwick Common Stock were  held in

                                       27

<PAGE>

Trenwick's  treasury and (iii) 200,000  shares of Series B Junior  Participating
Preferred Stock, were reserved for issuance in connection with the rights issued
pursuant to the Rights  Agreement  dated as of  September  24, 1997 (the "Rights
Agreement"),  between  Trenwick  and First  Chicago  Trust  Company of New York.
Except as set forth above,  at the close of business on June 18, 1999, no shares
of capital stock or other equity  securities  of Trenwick were issued,  reserved
for issuance or outstanding. All outstanding shares of capital stock of Trenwick
are,  and all  shares  which may be issued  pursuant  to this  Agreement  or the
Trenwick  Stock  Option  Plans will be, when issued,  duly  authorized,  validly
issued,  fully paid and  nonassessable  and not  subject to  preemptive  rights.
Except as set forth in Section 3.2(c) of the Trenwick Disclosure Schedule, since
January 1, 1999,  no shares of the capital  stock of  Trenwick  have been issued
other than pursuant to Trenwick Stock Options already in existence on such date,
and,  since such date, no Trenwick  Stock  Options have been granted.  No bonds,
debentures,  notes  or other  indebtedness  of  Trenwick  or any  subsidiary  of
Trenwick  having the right to vote (or convertible  into, or  exchangeable  for,
securities having the right to vote) on any matters on which the stockholders of
Trenwick  or any  subsidiary  of  Trenwick  may vote are issued or  outstanding.
Section  3.2(b)  of the  Trenwick  Disclosure  Schedule  lists  the  Significant
Subsidiaries of Trenwick and, except for the capital stock of such subsidiaries,
Trenwick  does not own,  directly  or  indirectly,  any  capital  stock or other
ownership  interest  in any  corporation,  partnership,  joint  venture or other
entity other than any publicly-traded  corporation in which Trenwick owns 100 or
fewer shares of common stock and other than any registered  investment  company.
All the outstanding  shares of capital stock of each subsidiary of Trenwick have
been  validly  issued  and are  fully  paid and  nonassessable  and are owned by
Trenwick,  by one or more wholly owned  subsidiaries  of Trenwick or by Trenwick
and one or more such  wholly  owned  subsidiaries,  free and clear of all Liens.
Except as set forth  above,  there are not any  securities,  options,  warrants,
rights,  commitments  or  agreements  of  any  kind  to  which  Trenwick  or any
subsidiary  is a party or by which any of them is bound  obligating  Trenwick or
any subsidiary to issue,  sell or deliver,  or  repurchase,  redeem or otherwise
acquire,  shares of capital stock or other equity or voting securities of any of
them or securities  convertible into or exchangeable for capital stock or voting
securities  of Trenwick,  or  obligating  any of them to issue,  sell,  deliver,
grant,  extend  or  enter  into  any  such  security,  option,  warrant,  right,
commitment or agreement.  There are no stockholder agreements,  voting trusts or
other agreements or  understandings to which Trenwick or any of its subsidiaries
is a  party,  or to  which  any of them is  bound,  relating  to the  voting  or
disposition  of any  shares  of  capital  stock of  Trenwick  or any  subsidiary
thereof.

     (d) Authority; Noncontravention. Trenwick has all requisite corporate power
and authority to enter into this  Agreement  and,  subject to obtaining the
Trenwick  Stockholder Approval (as defined in Section 3.2(o)), to consummate the
transactions  contemplated  by  this  Agreement.   Trenwick  has  all  requisite
corporate  power and  authority to enter into the Stock Option  Agreement and to
consummate the transactions  contemplated thereby. The execution and delivery of
this Agreement and the Stock Option  Agreement by Trenwick and the  consummation
by Trenwick of the  transactions  contemplated  by this  Agreement and the Stock
Option Agreement have been duly authorized by all necessary  corporate action on
the  part of  Trenwick,  subject  to the  Trenwick  Stockholder  Approval.  This
Agreement and the Stock Option Agreement have been duly executed and delivered



                                      28
<PAGE>


by Trenwick and, assuming the due authorization,  execution and delivery of this
Agreement and the Stock Option Agreement by Chartwell  constitute  legal,  valid
and binding obligations of Trenwick,  enforceable against Trenwick in accordance
with their  respective  terms.  The execution and delivery of this Agreement and
the Stock Option  Agreement  do not,  and,  subject to the Trenwick  Stockholder
Approval with respect to this Agreement,  the  consummation of the  transactions
contemplated  by this  Agreement and the Stock Option  Agreement and  compliance
with the provisions of this  Agreement and the Stock Option  Agreement will not,
conflict with, or result in any violation of, or default (with or without notice
or lapse  of  time,  or both)  under,  or give  rise to a right of  termination,
cancellation  or  acceleration  of any obligation or loss of a benefit under, or
result  in the  creation  of any Lien  upon any of the  properties  or assets of
Trenwick or any of its subsidiaries  under, (i) the Certificate of Incorporation
or By-laws of Trenwick or the comparable  organizational documents of any of its
subsidiaries,  (ii) subject to the matters referred to in the next sentence, any
indenture or other material agreement,  permit, franchise, license or instrument
to which Trenwick or any of its  subsidiaries is a party or by which Trenwick or
any of its  subsidiaries  or any of their assets is bound or affected,  or (iii)
subject to the  matters  referred to in the next  sentence,  any  statute,  law,
ordinance, rule, regulation, order, judgment,  injunction, decree, determination
or award  applicable  to  Trenwick  or any of its  subsidiaries  or any of their
respective  properties or assets,  other than, in the case of clause (ii) above,
any  such  conflicts,   violations,  defaults,  rights,  losses  or  Liens  that
individually or in the aggregate would not (x) have a Material Adverse Effect on
Trenwick  or (y)  reasonably  be expected  to impair  materially  the ability of
Trenwick to perform its  obligations  under this  Agreement and the Stock Option
Agreement.  No consent,  approval,  order, or authorization  of, action by or in
respect of, or registration, declaration or filing with any Governmental Entity,
or of  Lloyd's,  is  required  by or  with  respect  to  Trenwick  or any of its
subsidiaries in connection with the execution and delivery of this Agreement and
the Stock Option  Agreement by Trenwick or the  consummation  by Trenwick of the
transactions  contemplated  hereby,  except  for  (A) in  connection  with or in
compliance  with the provisions of (1) the HSR Act, (2) the Securities  Act, (3)
the  Exchange  Act,  (4)  the  DGCL,  (5)  NASDAQ,  (6)  any  non-United  States
competition,  antitrust and  investment  laws,  and the securities or "blue sky"
laws of the various  states,  (7) the  approvals,  filings and notices  required
under the insurance laws of the  jurisdictions  in which Trenwick  transacts the
business of  reinsurance;  (8) the filing of the  certificate of merger with the
Delaware  Secretary  of  State  and  appropriate  documents  with  the  relevant
authorities of other states in which  Trenwick is qualified to do business,  (9)
any  required  consents  and  waivers  of Lloyd's  and (B) such other  consents,
approvals, orders, authorizations, actions, registrations, declarations, filings
or notices  (as may be  required)  the  failure of which to be made or  obtained
individually  or in the aggregate  would not have a Material  Adverse  Effect on
Trenwick.

     (e) SEC  Documents;  Financial  Statements.  (i) Trenwick  has timely filed
all  required  forms,   reports,  schedules,  statements  and  other   documents
(including  exhibits and all  other  information  incorporated   therein)   with
the SEC since  January 1, 1996.  Trenwick  has  delivered  or made  available to
Chartwell  all  registration  statements,  proxy  statements,   annual  reports,
quarterly  reports  and  reports  on  Form  8-K and  other  forms,  reports  and
documents, if any, filed by Trenwick with the SEC since January 1, 1996 (as such
documents  have been amended since the time of their filing,  collectively,  the
"Trenwick SEC Documents").  As of their  respective dates or, if amended,  as of
the date of the last such amendment,  the Trenwick SEC Documents (i) were timely
filed and complied as to


                                       29
<PAGE>


form in all material respects with the applicable requirements of the Securities
Act or the Exchange  Act, as the case may be, and the rules and  regulations  of
the SEC promulgated  thereunder  applicable to such Trenwick SEC Documents,  and
(ii) did not contain any untrue  statement of a material fact or omit to state a
material  fact  required to be stated  therein or necessary in order to make the
statements  therein,  in light of the circumstances  under which they were made,
not misleading.  The consolidated  financial  statements of Trenwick included in
the Trenwick SEC Documents  complied as to form, as of their respective dates of
filing  with  the SEC,  in all  material  respects  with  applicable  accounting
requirements  and the published  rules and  regulations  of the SEC with respect
thereto,  have been prepared in accordance  with generally  accepted  accounting
principles (except, in the case of unaudited  consolidated quarterly statements,
as permitted  by Form 10-Q of the SEC) applied on a consistent  basis during the
periods  involved  (except as may be indicated in the notes  thereto) and fairly
present in all material respects the consolidated financial position of Trenwick
and its  consolidated  subsidiaries as of the dates thereof and the consolidated
results of their  operations and cash flows for the periods then ended (subject,
in the case of unaudited quarterly statements, to normal year-end adjustments).

                           (ii)   Trenwick has previously furnished to Chartwell
true and  complete  copies of  the  annual  statements  for each  of  the  years
ended December 31, 1996, December 31, 1997, and December 31, 1998, together with
all exhibits and schedules thereto (collectively, the "Annual Statements"), with
respect to Trenwick  America  Reinsurance  Company  ("TARCO")  as filed with the
appropriate  Insurance  Regulator.   The  Annual  Statements  were  prepared  in
conformity  with  SAP and  present  fairly,  to the  extent  required  by and in
conformity with SAP in all material respects the statutory  financial  condition
of TARCO at their  respective  dates and the results of  operations,  changes in
capital and  surplus and cash flow of TARCO for each of the periods  then ended.
No  deficiencies  or violations  material to the  financial  condition of TARCO,
individually,  whether or not material in the  aggregate,  have been asserted in
writing  by any  Insurance  Regulator  which  have not been  cured or  otherwise
resolved to the satisfaction of such Insurance  Regulator  (unless not currently
pending).  Trenwick has made available to Chartwell true and complete  copies of
all financial  examination reports of state insurance  departments since January
1, 1996  relating to TARCO.  The  quarterly  statements of TARCO for the quarter
ending March 31, 1999 as filed and the quarterly  statements of TARCO thereafter
filed prior to the Closing, when filed with the insurance regulatory authorities
of the  applicable  states,  presented  and will present  fairly,  to the extent
required by and in  conformity  with SAP in all material  respects the statutory
financial  condition of TARCO at its respective  dates indicated and the results
of operations, changes in capital and surplus and cash flow of TARCO for each of
the periods therein specified (subject to normal year-end adjustments).

                           (iii) Trenwick has previously  furnished to Chartwell
true  and  complete   copies  of   the   financial   statements   of   Trenwick
International  Limited  ("Trenwick  International")  for each of the years ended
December  31,1996,  December 31, 1997, and December 31, 1998,  together with all
exhibits  and  schedules  thereto  (collectively,  the  "Trenwick  International
Financial Statements"),  as filed with the appropriate Insurance Regulator.  The
Trenwick  International  Financial  Statements  have been prepared in accordance
with the  requirements  of all  relevant  statutes and with  generally  accepted
accounting  principles  (including  to the extent  applicable,  the  Guidance on
Accounting  for Insurance  Business as published by the  Association  of British
Insurers) ("U.K. GAAP") and are complete and accurate in all material respects

                                      30

<PAGE>


and show a true and fair view of the state of affairs of Trenwick  International
and  its  subsidiaries  and  the  profit  of  Trenwick   International  and  its
subsidiaries  for the financial  period  ending on their  respective  dates.  No
deficiencies  or  violations  material to the  financial  condition  of Trenwick
International, individually, whether or not material in the aggregate, have been
asserted  in writing  by any  Insurance  Regulator  which have not been cured or
otherwise  resolved to the satisfaction of such Insurance  Regulator (unless not
currently  pending).  Trenwick has made available to Chartwell true and complete
copies of all financial  examination reports of applicable  insurance regulatory
authorities  since  January 1, 1996 relating to Trenwick  International  and its
subsidiaries. The quarterly statements of Trenwick International for the quarter
ending March 31, 1999 and thereafter  prior to the Closing,  when filed with the
appropriate Insurance Regulators, will have been prepared in accordance with the
requirements  of all relevant  statutes and with U.K.  GAAP and are complete and
accurate in all material  respects and show a true and fair view of the state of
affairs  of  Trenwick  International  and its  subsidiaries  and the  profit  of
Trenwick  International  and its subsidiaries for the financial period ending on
their respective dates (subject to normal year-end adjustments).

     (f)   Information Supplied.   None of  the  information  supplied or to  be
supplied by Trenwick for inclusion or incorporation  by  reference  in  (i)  the
Form S-4 will, at the time the Form S-4 is filed with the SEC, at any time it is
amended or supplemented or at the time it becomes effective under the Securities
Act,  contain  any  untrue  statement  of a  material  fact or omit to state any
material fact required to be stated  therein or necessary to make the statements
therein,  in light of circumstances under which they are made, not misleading or
(ii)  the  Joint  Proxy  Statement  will,  at the  date it is  first  mailed  to
Trenwick's  stockholders or at the time of the Trenwick Stockholders Meeting (as
defined in Section 5.2), contain any untrue statement of a material fact or omit
to state any material fact  required to be stated  therein or necessary in order
to make the statements  therein,  in light of the circumstances under which they
are made,  not  misleading.  The Form S-4 will comply as to form in all material
respects  with  the  requirements  of the  Securities  Act  and  the  rules  and
regulations promulgated thereunder.  The Joint Proxy Statement will comply as to
form in all material  respects with the requirements of the Exchange Act and the
rules and regulations promulgated thereunder.  Notwithstanding the foregoing, no
representation  or  warranty is made by  Trenwick  in this  Section  3.2(f) with
respect to information  supplied by Chartwell for inclusion or  incorporation by
reference in the Joint Proxy Statement.

     (g)  Absence  of  Certain  Changes or  Events.  Except in  connection  with
this   Agreement,    the   Stock   Option    Agreement   and  the   transactions
contemplated  hereby,  as  disclosed in the  Trenwick  SEC  Documents  filed and
publicly  available prior to the date of this Agreement (the "Filed Trenwick SEC
Documents")  since  the date of the most  recent  audited  financial  statements
included in the Filed Trenwick SEC Documents, Trenwick and its subsidiaries have
conducted their business in the ordinary  course  consistent with past practice,
and there has not occurred (i) any event or change having individually or in the
aggregate a Material Adverse Effect on Trenwick,  (ii) any declaration,  setting
aside or payment of any dividend or other  distribution  (whether in cash, stock
or property) with respect to any of Trenwick's  outstanding capital stock, other
than regular  quarterly cash dividends of $.26 per share on the Trenwick  Common
Stock and dividends paid by wholly owned subsidiaries, (iii) (A) any granting by
Trenwick or any of its subsidiaries to any current or former director or officer
of Trenwick or its subsidiaries of any increase in compensation,  bonus or other
benefits,  except for normal  increases in the ordinary course of business,  (B)
any  granting  by  Trenwick or any of its  subsidiaries  to any such  current or
former  director or officer of any increase in severance or  termination  pay or
(C) any entry by Trenwick or any of its subsidiaries into, or any amendments of,
any employment,  deferred compensation,  consulting,  severance,  termination or
indemnification  agreement with any such current or former  director or officer,
(iv)  any tax  election  that  individually  or in the  aggregate  would  have a
Material  Adverse  Effect  on  Trenwick  or  any of its  tax  attributes  or any
settlement or compromise of any material income tax liability, or (v) any change
in  accounting  methods,  principles  or  practices  by  Trenwick  or any of its
subsidiaries materially affecting their assets,  liabilities or business, except
insofar  as may have  been  required  or  permitted  by a change  in  applicable
accounting principles (including SAP).

                                       31

<PAGE>

     (h)  Benefit Plans.   (A) (i)  Each "employee  benefit plan" (as defined in
Section 3(3) of ERISA), and  each other plan,  arrangement  or  policy,  whether
written or oral, relating to stock options, stock purchases,  stock appreciation
rights,  profit  sharing,  group  insurance,  vacation  pay,  leave of  absence,
dependent care, cafeteria benefits, workers compensation,  consulting,  pension,
retirement,  compensation, deferred compensation,  severance, fringe benefits or
other employee benefits,  in each case maintained or contributed to, or required
to be maintained or contributed to, by Trenwick or any of its  subsidiaries  for
the  benefit of any  present or former  U.S.  officer,  employee  or director of
Trenwick or any of its subsidiaries (all the foregoing  collectively referred to
hereinafter as "Trenwick Benefit Plans") has been administered  substantially in
accordance with its terms and any related trust agreement or insurance  contract
has been administered  substantially in accordance with its terms. Trenwick, its
subsidiaries  and  all  the  Trenwick  Benefit  Plans,  and  any  related  trust
agreements  or  insurance  contracts,  are in  substantial  compliance  with the
applicable  provisions of ERISA,  the Code,  all other  applicable  laws and all
applicable collective bargaining agreements.

                           (ii)   None of Trenwick or any other person or entity
that together with Trenwick is treated  as  a  single   employer  under  Section
414 of the Code (each a "Trenwick Commonly  Controlled Entity") has incurred any
material  liability  under  Title IV of ERISA  (other  than for the  payment  of
benefits or the timely payment of Pension Benefit Guaranty Corporation insurance
premiums,  in either case in the  ordinary  course) or under  Section  412(f) or
412(n) of the Code, and no condition  exists which could  reasonably be expected
to present a risk of Trenwick or any Commonly Controlled Entity incurring such a
material liability.

                           (iii)  Neither  Trenwick  nor any  Trenwick  Commonly
Controlled  Entity is obligated to  contribute  to  any   "multiemployer   plan"
(as defined in Section 3(37) or Section 4001(a)(3) of ERISA) or has any material
liability,  including  current or  potential  withdrawal  liability  (within the
meaning of Section 4201 of ERISA) with respect to any multiemployer plan.

                           (iv)     Except as contemplated by Section 2.4 or as
disclosed in the Filed  Trenwick SEC Documents  or  in  Section  3.2(h)  of  the
Trenwick  Disclosure  Schedule,  since  the  date  of the  most  recent  audited
financial statements included in the Filed Trenwick SEC Documents, there has not
been any  adoption or amendment  by Trenwick or any of its  subsidiaries  of any
collective  bargaining  agreement  or  any  Trenwick  Benefit  Plan.  Except  as
disclosed  in the Filed  Trenwick  SEC  Documents  or in  Section  3.2(h) of the
Trenwick Disclosure Schedule, there exist no employment,  consulting,  change in
control, severance,  termination or indemnification agreements,  arrangements or
understandings  between  Trenwick  or any  subsidiary  and any current or former
employee,  officer or director of Trenwick  or any  subsidiary  or any  Trenwick
Benefit Plan.

                                       32

<PAGE>


                           (v) All  material  contributions  and other  payments
required  to  be   made  by  Trenwick  and  its  subsidiaries  to  any  Trenwick
Benefit Plan prior to the date hereof have been made and all  accruals  required
to be made under any Trenwick  Benefit  Plan have been made.  There is no claim,
dispute,  grievance,   charge,  complaint,   restraining  or  injunctive  order,
litigation or proceeding pending,  or, to the knowledge of Trenwick,  threatened
or anticipated  (other than routine claims for benefits)  against or relating to
any Trenwick  Benefit  Plan or against the assets of any  Trenwick  Benefit Plan
which could  reasonably be expected to result in the  imposition of any material
liability  of  Trenwick.  Neither  Trenwick  nor  any  of its  subsidiaries  has
communicated  generally to employees or specifically  to any employee  regarding
any future increase of benefit levels (or future creations of new benefits) with
respect to any Trenwick Benefit Plans.

                           (vi) Each Trenwick  Benefit Plan can be terminated or
otherwise  discontinued without any  liability  to  Trenwick or  any  subsidiary
that would  reasonably  be  expected  to have a Material  Adverse  Effect.  With
respect  to each  Trenwick  Benefit  Plan  subject to Title IV of ERISA and with
respect to each plan of a Trenwick  Commonly  Controlled Entity subject to Title
IV of ERISA (each a "Trenwick  Defined Benefit Plan")  Trenwick  Defined Benefit
Plan (i) no  termination  of any  Trenwick  Defined  Benefit  Plan has  occurred
pursuant to which all liabilities  have not been satisfied in full, and no event
has occurred and no condition exists that could reasonably be expected to result
in Trenwick or any Trenwick Commonly Controlled Entity incurring liability under
Title IV of ERISA or could  constitute  grounds  for  terminating  any  Trenwick
Defined Benefit Plan;  (ii) each Trenwick  Defined Benefit Plan which is subject
to Part 3 of Subtitle B of Title I of ERISA or Section 412 of the Code, has been
maintained in  compliance  with the minimum  funding  standards of ERISA and the
Code and no such  Trenwick  Defined  Benefit Plan has incurred any  "accumulated
funding  deficiency,"  as defined in Section  412 of the Code and Section 302 of
ERISA,  whether or not waived;  (iii) neither Trenwick nor any Trenwick Commonly
Controlled  Entity has sought or received a waiver of its  funding  requirements
with respect to any Trenwick Defined Benefit Plan and all material contributions
payable with respect to each Defined Benefit Plan have been timely made; (iv) no
reportable  event,  within the  meaning of Section  4043 of ERISA,  and no event
described  in Section 4062 or 4063 of ERISA,  has  occurred  with respect to any
Trenwick Defined Benefit Plan; (v) the aggregate accumulated benefit obligations
of each  Trenwick  Defined  Benefit Plan subject to Title IV of ERISA (as of the
date of the most recent actuarial  valuation  prepared for such Trenwick Defined
Benefit Plan) do not exceed the fair market value of the assets of such Trenwick
Defined Benefit Plan (as of the date of such  valuation);  and (vi) no amendment
has been made to any  Trenwick  Defined  Benefit Plan that has required or would
require the  provision  of  security  under  ERISA  Section 307 or Code  Section
401(a)(29).

                           (vii) The execution, delivery and performance of this
Agreement  and the   transactions   contemplated  hereby  will  not in  and  of
themselves  result in the  imposition of any federal  excise tax with respect to
any Trenwick Benefit Plan.

                                       33

<PAGE>


                           (viii) Neither Trenwick nor any subsidiary  maintains
or contributes (or has maintained  or  contributed  to)  any  Trenwick   Benefit
Plan which provides,  or has a liability to provide,  life  insurance,  medical,
severance,  or  other  employee  welfare  benefits  to  any  employee  upon  his
retirement or termination  of  employment,  except as may be required by Section
4980B of the Code.

                           (ix)   Neither Trenwick nor any  of its subsidiaries
maintains or contributes to a trust,  organization or association described  in
any of the Sections 501(c)(9), 501(c)(17) or 501(c)(2) of the Code.

                           (x)   Favorable   determination   letters  have  been
received  from  the  Internal   Revenue  Service with respect  to  each Trenwick
Benefit Plan which is intended to comply with the  provisions of Section  401(a)
of the  Code,  and each  such  Trenwick  Benefit  Plan  complies  in form and in
operation in all material  respects with the  requirements of a "qualified plan"
under Section 401(a) of the Code.

                           (xi)  Neither Trenwick  nor any of its subsidiaries,
nor  any  of  their   respective  directors,  officers,  employees  or,  to  the
knowledge of Trenwick any other  "fiduciary," as such term is defined in Section
3(21) of ERISA,  has any  liability for failure to comply with ERISA or the Code
for any  action or  failure  to act in  connection  with the  administration  or
investment of the Trenwick Benefit Plans.

                           (xii)  There  has  been  no act or acts  which  would
result in a disallowance of a deduction or the  imposition  of  a  tax  pursuant
to Section 4980B,  or with regard to plan years  beginning  before  December 31,
1988, Section 162(i) of the Code as in effect immediately prior to the enactment
of the  Technical  and  Miscellaneous  Revenue Act of 1988,  or any  regulations
promulgated  thereunder,  whether  final,  temporary or  proposed.  No event has
occurred  with  respect to which  Trenwick or any of its  subsidiaries  could be
liable for a tax imposed by Chapter 43 of Subtitle A of the Code, or for a civil
penalty or other liability under Section 502(c) or Section 501(l) of ERISA. Each
Trenwick Benefit Plan that is a "group health plan" as defined in Section 607 of
ERISA  complies in all material  respects and has been  operated in  substantial
compliance  in all  respects  with  Part 7 of Title I,  Subtitle  B of ERISA and
Subtitle K of the Code.

                           (xiii) With respect to each of the  Trenwick  Benefit
Plans, Trenwick has delivered to  Chartwell  true  and  complete  copies of: (a)
the plan documents, including any related trust agreements,  insurance contracts
or other funding arrangements,  or a written summary of the terms and conditions
of the  plan  if  there  is no  written  plan  document;  (b)  the  most  recent
determination  letter received from the Internal Revenue  Service;  (c) the most
recent IRS Form 5500;  (d) the most  recent  actuarial  valuation;  (e) the most
recent financial  statement;  (f) all material  correspondence with the Internal
Revenue  Service,  the  Department  of Labor and the  Pension  Benefit  Guaranty
Corporation  with  respect to the past three plan years other than IRS Form 5500
filings  and  PBGC  premium  payments;  and (g) the  most  recent  summary  plan
description.

                           (B)   Except as  would not  have a  Materia  Adverse
Effect  on   Trenwick  and  so  fa r as  the  senior   management   of  Trenwick
International as hereinafter defined (and for this purpose the senior management
means the following  individuals:  Pierre D. Croizat and Russell J. English) are
aware:

                                       34

<PAGE>


                           (i)     There is no existing or threatened or pending
industrial  or  trade  dispute  involving Trenwick International and any of  the
employees of Trenwick  International and there are no facts known or which would
on reasonable  inquiry be known to Trenwick  International  which might indicate
that there may be any such dispute  (excluding  the Merger and the  transactions
contemplated  by  this  Agreement).  There  are no  agreements  or  arrangements
(whether  oral or in writing or  existing by reason of custom and  practice  and
whether or not legally  binding) between  Trenwick  International  and any trade
union  or  other  employees'   representatives  or  organization  concerning  or
affecting the employees of Trenwick  International and there are no trade unions
or other employees'  representatives whom Trenwick  International  recognizes to
any  extent  for  collective   bargaining  purposes  nor,  so  far  as  Trenwick
International is aware, has Trenwick  International  done any act which might be
construed as recognition.

                           (ii)  Trenwick  International  has given no notice of
any redundancies to the U.K.  Secretary  of  State  nor  started   consultations
with any  independent  trade  union or  employees'  representatives  within  the
preceding  period  of one  year in  relation  to any of  employees  of  Trenwick
International.  No circumstances have arisen under which Trenwick  International
is likely to be  required to pay damages  for  wrongful  dismissal  or breach of
contract, to make any contractual or statutory redundancy payment or make or pay
any compensation in respect of unfair dismissal, to make any other payment under
any  employment  protection  legislation or to reinstate or re-engage any former
employee.  No  circumstances  have arisen under which Trenwick  International is
likely to be required to pay damages or  compensation,  or suffer any penalty or
be required to take  corrective  action or be subject to any form of  discipline
under the  Employment  Rights Act 1996,  the Trade  Union and  Labour  Relations
(Consolidation)   Act  1992,  the  Transfer  of   Undertakings   (Protection  of
Employment) Regulations 1981, the Sex Discrimination Act 1975, the Equal Pay Act
1970, the Treaty of Rome or any Directive or recommendation made pursuant to it,
the Race Relations Act 1976 or the Disability Discrimination Act 1995. So far as
Trenwick  International  is aware,  there are no current,  pending or threatened
claims of any type  against  Trenwick  International  by any  existing or former
employees or directors  of Trenwick  International  or by any existing or former
consultants to Trenwick International.

                           (iii)  There  are  no   existing   service  or  other
agreements  or   contracts   between  Trenwick  International  and  any  of  its
directors or executives or employees which cannot be lawfully  terminated by six
calendar  months' notice or less without giving rise to any claim for damages or
compensation  other than a  statutory  redundancy  payment or a claim for unfair
dismissal   depending  on  the   circumstances  of  the  termination.   Trenwick
International  has  complied  with  all  its  material   obligations  under  all
legislation,  regulations  and  other  requirements  having  the  force  of  law
(including,  without  limitation,  orders  and  awards) in  connection  with its
employees, directors and consultants.

                           (iv)  Trenwick   International  is  not  involved  in
negotiations (whether with employees or any trade union or other employees'
representatives) to vary the terms and conditions of employment or engagement of
any  of  its  employees,   directors  or  consultants   and  has  not  made  any
representations,  promises,  offers  or  proposals  to  any  of  its  employees,
directors   or   consultants   or  to  any  trade  union  or  other   employees'
representatives  concerning or affecting the terms and  conditions of employment
or engagement of any of its employees, directors or consultants.


                                       35


<PAGE>

                           (v)  Trenwick   International   has   discharged  its
obligations  in   full  in  relation  to   salary,  wages,   fees,   commission,
bonuses,  overtime  pay,  holiday  pay,  sick  pay and all  other  benefits  and
emoluments  relating to its employees,  consultants  and directors in respect of
all prior periods.
                           (vi)  There  are  no  pension,  share  option,  share
incentive, life  assurance,  disability  or  similar  schemes,  arrangements or
obligations  for  any  employees or directors of  Trenwick   International,  and
Trenwick   International   has  no  obligations   (whether  legally  binding  or
established  by  custom)  to pay any  pension  or make any other  payment  after
retirement  or death or  otherwise  to provide  "relevant  benefits"  within the
meaning of section 612 of the U.K. Income and  Corporation  Taxes Act 1988 or to
make any payment for the purpose of providing such "relevant  benefits" to or in
respect of any person who is now or has been an officer or  employee of Trenwick
International  and is not a party to any  scheme  or  arrangement  having as its
purpose or one of its purposes the making of such  payments or the  provision of
such benefits.

                           (vii) All Retirement Benefits Schemes comply with and
have  at  all  time   complied  with the provisions of the relevant  legislation
and the requirements of the Pension Schemes Office and the Contributions  Agency
affecting  schemes  approved under Chapter I of Part XIV of the U.K.  Income and
Corporation  Taxes Act 1988.  Trenwick  International  and the  trustees of such
schemes have duly complied  with their  respective  obligations  under the trust
deeds  and the  rules  thereof  and under  the  aforementioned  legislation  and
requirements.  All  amounts  due to the  trustees  thereof  or to any  insurance
company in connection therewith have been paid.

                           (viii)  Neither   Trenwick   International   nor  the
trustees  of  any pension   scheme is  engaged in any  litigation or arbitration
proceedings in respect of any Retirement Benefits Scheme or any benefit provided
thereunder  in  relation  to the  employees  or  former  employees  of  Trenwick
International and there are no current  submissions or referrals to the Pensions
Ombudsman  or to the  Occupational  Pensions  Advisory  Service  in  respect  of
Trenwick International or any pension scheme.

                           (ix) No Retirement Benefits Scheme in which employees
or  former employees of Trenwick International participate or have participated
has been or is in the process of being (or is proposed to be) wound up (in whole
or in part) or closed to new entrants (in whole or in part).


            (i)  Taxes.    (i)  Trenwick  is the common parent of an  affiliated
group of  corporations  (within the  meaning  of Section 1504(a) of   the  Code)
eligible to file consolidated  federal income tax returns,  of which each of the
subsidiaries that is an includible corporation under Section 1504(b) of the Code
is a member;

                           (ii)     Trenwick and each of its  subsidiaries  have
     filed (or  joined  in the  filing  of) when due all  material  tax  returns
required by  applicable  law to be filed with  respect to Trenwick or any of the
subsidiaries and all taxes shown to be due on such tax returns have been paid;


                                       36
<PAGE>

                           (iii) all such tax  returns  were true,  correct  and
complete as of the time of such filing;

                           (iv) all material taxes relating to periods ending on
or before the  Effective  Time owed by  Trenwick  or any  of  its   subsidiaries
(whether  or not shown on any tax  return)  or to which  Trenwick  or any of its
subsidiaries may be liable under Treasury Regulations ss. 1.1502-6 (or analogous
state  or  foreign  provisions)  by  virtue  of  having  been  a  member  of any
"affiliated group" (or other group filing on a combined or unitary basis) at any
time on or prior to the Effective Time, if required to have been paid, have been
paid (except for taxes which are being contested in good faith);

                           (v)     any  liability  of Trenwick  or  any  of  its
subsidiaries  for  material  taxes not yet due and payable, or which  are  being
contested in good faith,  has been provided for on the  financial  statements of
Trenwick in accordance with generally accepted accounting principles;

                           (vi)   there   is  no   action,   suit,   proceeding,
investigation,  audit or claim   now  pending  against,  or  with   respect  to,
Trenwick  or  any  of  its  subsidiaries  in  respect  of  any  material  tax or
assessment,  nor is any claim for additional  tax or assessment  asserted by any
tax authority;

                           (vii) since January 1, 1991, no claim has  been  made
by  any  tax   authority  in a  jurisdiction  where  Trenwick  or  any  of  its
subsidiaries  does not currently  file a tax return that it is or may be subject
to material tax by such  jurisdiction,  nor to Trenwick's  knowledge is any such
assertion threatened;

                           (viii) there is no outstanding request by Trenwick or
any of its  subsidiaries  for any extension of time within which to pay any
taxes or file any tax returns;

                           (ix)  there has been no waiver  or  extension  of any
applicable statute of limitations for the assessment or collection of any  taxes
of Trenwick or any of its subsidiaries;

                           (x)   no property of Trenwick or any of its
subsidiaries is "tax-exempt use property" within the meaning of Section  168(h)
of the Code;

                           (xi) neither  Trenwick nor any of its subsidiaries is
a party to any lease made pursuant to former Section 168(f)(8) of the Internal
Revenue Code of 1954;

                           (xii) no excess loss  account  (within the meaning of
Treasury Regulations ss. 1.1502-19) exists with respect to any of Trenwick's
subsidiaries;

                                       37

<PAGE>

                           (xiii) neither  Trenwick nor any of its  subsidiaries
has any deferred gain or loss arising from any intercompany transactions, within
the meaning of Treasury Regulations ss. 1.1502-13;

                           (xiv)  neither  Trenwick nor any of its  subsidiaries
has filed any agreement or consent under Section 341(f) of the Code;

                           (xv) except as set forth in Section 3.2(i)(xv) of the
Trenwick Disclosure Schedule, neither Trenwick nor any of its  subsidiaries  is
a party to any  agreement,  whether  written or unwritten,  providing  for  the
payment  of  taxes, payment for tax  losses, entitlements to refunds or similar
tax matters;

                           (xvi) no ruling with  respect to taxes  (other than a
request for determination of the status  of a qualified pension  plan)  has been
requested by or on behalf of Trenwick or any of its subsidiaries;

                           (xvii) neither  Trenwick nor any of its  subsidiaries
has been a United States real property holding corporation within the meaning of
Section 897(c)(2) of the Code during the applicable period specified in Section
897(c)(1)(A)(ii) of the Code;

                           (xviii)  Trenwick and each of its  subsidiaries  have
withheld and paid all material taxes required to be withheld in connection with
any amounts paid or owing to any employee, creditor, independent contractor or
other third party; and

                           (xix)  neither  Trenwick nor any of its  subsidiaries
has  taken  any  action  or knows  of any  fact,   agreement,  plan or  other
circumstance  that is reasonably likely to prevent the Merger from qualifying as
a reorganization within the meaning of Section 368(a) of the Code.


          (j)   Compliance with Applicable Laws.  Trenwick and its  subsidiaries
have in full force  and effect  all Permits  necessary for  them  to own, lease
or  operate  their  respective  properties  and  assets  and to  carry  on their
respective  business as now  conducted,  and there has occurred no default under
any such  Permit,  except for failures of Permits to be in full force and effect
and for defaults under Permits which  individually or in the aggregate would not
have a Material  Adverse  Effect on  Trenwick.  Except as disclosed in the Filed
Trenwick SEC Documents, Trenwick and its subsidiaries are in compliance with all
applicable  statutes,  laws,  ordinances,  rules,  regulations and orders of any
Governmental Entity,  except for such noncompliance which individually or in the
aggregate would not have a Material Adverse Effect on Trenwick. Trenwick and its
subsidiaries  are  in  compliance  with  all  applicable   recommendations   and
requirements of the Underwriting  Agency Department of Lloyd's,  except for such
noncompliance  which  individually or in the aggregate would not have a Material
Adverse Effect on Trenwick.

          (k) Litigation.  There is no suit, action,  proceeding or arbitration
(excluding  those  arising in  the ordinary  course  of  business  relating  to
policies of insurance or reinsurance  written by Trenwick and its  subsidiaries)
pending  or, to the  knowledge  of  Trenwick,  threatened  against or  affecting
Trenwick or any of its  subsidiaries  or any of their  respective  properties or
assets that individually or in the aggregate could reasonably be expected to (i)
have a Material Adverse Effect on Trenwick,  (ii) impair the ability of Trenwick
to  perform  its   obligations   under  this  Agreement  or  (iii)  prevent  the
consummation of any of the transactions  contemplated by this Agreement,  nor is
there any judgment, writ, decree, injunction or order of any Governmental Entity
or arbitrator outstanding against Trenwick or any of its subsidiaries having, or
which could be reasonably expected to have any such effect.

                                       38

<PAGE>

          (l) No  Undisclosed  Liabilities. Except (i) as disclosed in the Filed
Trenwick  SEC  Documents,  (ii)  obligations  for losses,  loss  adjustment
expenses,  unearned  premiums and  reinsurance  premiums under  reinsurance  and
insurance contracts entered into by Trenwick and its subsidiaries and (iii) as a
result of any transaction which has been approved in writing by Chartwell,  none
of  Trenwick or its  subsidiaries  has any  liabilities  or  obligations  of any
nature, whether or not accrued,  contingent or otherwise,  and whether due or to
become due or asserted or unasserted  which,  individually  or in the aggregate,
would have a Material Adverse Effect on Trenwick.

          (m)  Reserves.   (i)  All  reserves  for  claims,  losses  (including,
without  limitation,  incurred but not reported losses) and loss adjustment
expenses (whether allocated or unallocated) as reflected in the Annual Statement
of TARCO for each of the years ended  December 31, 1996,  December 31, 1997, and
December 31, 1998,  together  with all exhibits and  schedules  thereto (a) were
determined in accordance with SAP and commonly accepted actuarial  standards and
principles  consistently applied and were fairly stated in accordance with sound
actuarial  principles  specified by the Actuarial  Standards Board, (b) meet the
requirements of all applicable  insurance laws,  rules,  and regulations of each
applicable  jurisdiction  in all  material  respects,  and  (c)  were  based  on
actuarial assumptions which were in accordance with those called for in relevant
policy and contract  provisions,  and such reserves made reasonable provision in
the  aggregate to cover the total amount of  liabilities  under all  outstanding
policies and  contracts of insurance,  reinsurance  and  retrocession  as of the
dates of such statutory  statements (it being understood that no  representation
or warranty is made in this  Agreement to the effect that such  reserves were in
fact adequate to cover the actual amount of such liabilities that are eventually
paid after the date thereof).  Each Insurer owns assets that qualify as admitted
assets under  applicable  insurance  laws and  regulations in an amount at least
equal to all such  required  reserves  plus its  minimum  statutory  capital and
surplus as required under  applicable  insurance  laws,  rules and  regulations.
Except  as set forth in  Section  3.2(m) of the  Trenwick  Disclosure  Schedule,
TARCO's  reserves have not been  discounted  on either a tabular or  non-tabular
basis.

                           (ii)  All net reserves for claims, losses (including,
without  limitation,  incurred but not reported losses) and loss adjustment
expenses  (whether  allocated  or  unallocated)  of  Trenwick  International  as
reflected in the audited financial  statements of Trenwick for each of the years
ended December 31, 1997 and December 31, 1998 (a) were  determined in accordance
with GAAP and commonly accepted actuarial standards and principles  consistently
applied and were fairly stated in  accordance  with sound  actuarial  principles
specified  by the  Actuarial  Standards  Board and (b) were  based on  actuarial
assumptions  which were in accordance  with those called for in relevant  policy
and contract  provisions,  and such  reserves made  reasonable  provision in the
aggregate  to cover  the  total  amount of  liabilities  under  all  outstanding
policies and  contracts of insurance,  reinsurance  and  retrocession  as of the
dates  of  such  audited  financial  statements  (it  being  understood  that no
representation  or  warranty is made in this  Agreement  to the effect that such
reserves were in fact  adequate to cover the actual  amount of such  liabilities
that are eventually paid after the date thereof).

                                       39

<PAGE>

          (n)   Opinion  of  Financial   Advisor.  Trenwick  has  received  the
opinion of Donaldson,  Lufkin & Jenrette  Securities  Corporation dated as  of
the date of this Agreement to the effect that the  Conversion  Number is fair to
the stockholders of Trenwick from a financial point of view.

          (o)   Voting  Requirements.  The  affirmative  vote of holders  of  a
majority  of the  shares of  Trenwick  Common  Stock  (with  each  share of
Trenwick  Common  Stock  having one vote per  share) to  approve  and adopt this
Agreement   and  the  Merger  and  to  authorize   the  issuance  of  the  Stock
Consideration  (the  "MetroCo  Stockholder  Approval")  is the only  vote of the
holders of any class or series of capital stock of MetroCo  necessary to approve
and adopt  this  Agreement  and the  Merger  and the  transactions  contemplated
hereby.

          (p)    Brokers.  No broker,  investment banker,  financial advisor or
other  person,   other   than   Donaldson,   Lufkin  &  Jenrette    Securities
Corporation,  the  fees  and  expenses  of which  will be paid by  Trenwick,  is
entitled to any broker's,  finder's, financial advisor's or other similar fee or
commission in connection  with the  transactions  contemplated by this Agreement
based upon arrangements made by or on behalf of Trenwick. Trenwick has furnished
to Chartwell  true and complete  copies of all  agreements  under which any such
fees or  expenses  are  payable  and all  indemnification  and other  agreements
related to the engagement of the persons to whom such fees are payable.

          (q)    No Default. Except as disclosed in the Trenwick SEC Documents,
the  business  of  Trenwick  and  each  of its   subsidiaries  is  not   being
conducted in default or violation of any term, condition or provision of (i) its
respective  certificate of  incorporation  or by-laws or similar  organizational
documents,  or (ii) any company  agreement,  excluding from the foregoing clause
(ii),  defaults or violations  that would not have a Material  Adverse Effect on
Trenwick or would not  materially  impair the ability of Trenwick to  consummate
the Merger or the other transactions contemplated hereby.

          (r)    Related  Party  Transactions.  All  transactions,  agreements,
arrangements  or   understandings  between   Trenwick  or any  of  Trenwick's
subsidiaries,   on  the  one  hand,  and  Trenwick's   affiliates   (other  than
wholly-owned subsidiaries of Trenwick) or other Persons, on the other hand, that
are required to be disclosed in the Trenwick SEC  Documents in  accordance  with
Item 404 of Schedule S-K under the Securities Act have been so disclosed.  Since
March 31, 1999,  there have been no  transactions,  agreements,  arrangements or
understandings between Trenwick or any of its subsidiaries, on the one hand, and
Trenwick's  affiliates  (other than  wholly-owned  subsidiaries  of Trenwick) or
other  Persons,  on the other hand,  that would be required to be  disclosed  in
future  public  filings  under the Exchange Act pursuant to such Item which have
not already been disclosed in the Trenwick SEC Documents filed prior to the date
hereof.

                                       40

<PAGE>

          (s) Title to Property.  (i) Trenwick  and its  subsidiaries have  good
and valid title to, have valid leasehold  interests in or valid contractual
rights to use, all of the assets, tangible and intangible,  used by or necessary
for the conduct of, their  business,  except where the failure to have such good
and valid title,  valid leasehold  interests or such valid contractual rights do
not,  individually  or in the  aggregate,  have a  Material  Adverse  Effect  on
Trenwick.

                           (ii)     Trenwick and its subsidiaries:

                                    (a) own and have good and  marketable  title
                  in fee simple to the real property  owned by such party,  free
                  and  clear  of  all  mortgages,   pledges,   liens,   charges,
                  encumbrances, defects, security interests, claims, options and
                  restrictions of all kind except for (y) minor imperfections of
                  title, easements and rights of way, none of which individually
                  or in the aggregate,  materially detracts from the value of or
                  impairs  the  use of the  affected  property  or  impairs  the
                  operations  of  Trenwick  or any of its  subsidiaries  and (z)
                  liens for current taxes not yet due and payable;

                                    (b)   is   in   peaceful   and   undisturbed
                  possession  of the space and/or  estate under each lease under
                  which it is a tenant, and there are no material defaults by it
                  as tenant thereunder; and

                                    (c) has good and valid rights of ingress and
                  egress  to and from all the real  property  owned or leased by
                  such party from and to the public street systems for all usual
                  street, road and utility purposes.

          (t) Environmental.  (i) Trenwick and its subsidiaries are in material
compliance with all applicable Environmental Laws.

                              (ii)     To the knowledge of Trenwick, no facts,
events or  conditions  with respect to the operation of its business or the
business of its  subsidiaries,  or the locations of those businesses exist which
could reasonably be expected to interfere with or prevent  continued  compliance
with,  or could  give  rise to any  liability  (including,  without  limitation,
liability for clean up costs,  personal  injury or property  damage) or form the
basis for any claim, action, suit, proceeding,  hearing or investigation against
or involving Trenwick or any of its subsidiaries or their respective businesses,
under any applicable Environmental Law.

                           (iii) Trenwick and its subsidiaries have not received
any written  notice,  report or other  information  regarding any actual or
alleged  violation  of, or  liability  under,  Environmental  Laws  relating  to
Trenwick  or its  subsidiaries,  or the  locations  of the  operation  of  their
businesses, which violation or liability could have a Material Adverse Effect on
Trenwick.

                           (iv) There is no action,  suit, claim,  proceeding or
investigation pending, or to the knowledge of
Trenwick,  threatened against Trenwick or its subsidiaries that alleges or would
allege any violation of any applicable Environmental Laws.

                           (v)   To the knowledge of Trenwick, neither Trenwick
nor its subsidiaries has ever generated,  transported,  treated,  stored or
disposed of any  Hazardous  Material at any site,  location or facility,  and no
such  Hazardous  Material  is present on, in or under any  location  occupied by
Trenwick or its subsidiaries,  including without limitation, containment of such
Hazardous Material by means of any underground storage tank.

                                       41

<PAGE>

               Notwithstanding the foregoing, this Section 3.2(t) does not
include any  representation  or warranty with respect to Trenwick or any of
its subsidiaries  arising in their respective  capacities as reinsurer or issuer
of any insurance product.

          (u)  Reinsurance Contracts, Coverholders and MGAs. (i) Section 3.2(u)
of the Trenwick  Disclosure  Schedule  contains a true and complete list of
all MGAs and  Coverholders  with whom each  subsidiary of Trenwick does business
and all Reinsurance Contracts to which each subsidiary of Trenwick is a party as
the cedent  thereunder or by or to which each subsidiary of Trenwick is bound or
subject as the cedent  thereunder,  as each such  Reinsurance  Contract may have
been amended, modified or supplemented.  Except as would not, individually or in
the  aggregate,  have a Material  Adverse  Effect on  Trenwick:  (i) each of the
foregoing  Reinsurance  Contracts  is valid and binding in  accordance  with its
terms,  and is in full force and effect and (ii)  neither  the  Subsidiaries  of
Trenwick  nor, to the  knowledge of  Trenwick,  any other party  thereto,  is in
default in any material respect with respect to any such  Reinsurance  Contract,
nor to the knowledge of Trenwick  does any  condition  exist that with notice or
lapse of time or both would constitute such a material default thereunder.  None
of the contracts,  treaties or  arrangements  involving the MGAs or Coverholders
contain "change of control" provisions and no such Reinsurance Contract contains
any provision providing that any such other party thereto may terminate,  cancel
or commute the same by reason of the transactions contemplated by this Agreement
or any other provision which would be altered or otherwise become  applicable by
reason  of such  transactions,  and no party has  given  notice of  termination,
cancellation or commutation of any such Reinsurance  Contract or that it intends
to terminate, cancel or commute any such Reinsurance Contract as a result of the
transactions contemplated hereby.

                           (ii)     Except as set forth in Section 3.2(u) of the
Trenwick Disclosure Schedule,  TARCO is entitled under applicable insurance
laws, rules and regulations to take credit in its statutory financial statements
in accordance  with Chapter 22 of the NAIC  Accounting  Practices and Procedures
Manual for Property and  Casualty  Insurance  Companies as in effect on the date
hereof,  with respect to the Reinsurance  Contracts  listed in Section 3.2(u) of
the Trenwick  Disclosure Schedule and all such amounts are properly reflected in
the statutory  financial  statements of TARCO. Each of Trenwick and TARCO has no
knowledge of any disputes as to reinsurance or retrocessional coverage under, or
any terms or provisions of, any such Reinsurance  Contract.  To the knowledge of
Trenwick  and TARCO,  the  financial  condition  of any other  party to any such
Reinsurance  Contract is not  impaired  to the extent that a default  thereunder
could reasonably be expected to occur.

          (v)  Trenwick  Investees.  Other  than  its  Subsidiaries,  any
publicly-traded  corporation  in which Trenwick owns 100 or fewer shares of
common stock, or investments in registered investment  companies,  Trenwick does
not have any equity  investments or other ownership  interest in any corporation
or other entity.

                                       42
<PAGE>

          (w)   Insurance Issued. TARCO does not currently issue and has not
     issued since January 1, 1991 any primary  insurance  policies in the United
States.

          (x)  Approvals and Permits. To the  knowledge of Trenwick and without
inquiry,  Trenwick has no reason to believe that it and  its  affiliates  will
not be able to promptly  obtain all  necessary  approvals,  authorizations,  and
consents  of  Governmental  Entities  and  Lloyd's  required  to be  obtained to
consummate the transactions contemplated by this Agreement.

                                   ARTICLE IV

                    COVENANTS RELATING TO CONDUCT OF BUSINESS

          SECTION 4.1.   Conduct of Business.

          (a)    Conduct  of Business  by Chartwell.  Except   as  specifically
     contemplated by this Agreement or the Stock Option Agreement  (including as
set forth on Section 4.1 of the  Chartwell  Disclosure  Schedule),  or as may be
required  by law,  during  the  period  from the date of this  Agreement  to the
Effective Time,  Chartwell  shall, and shall cause its subsidiaries to, carry on
their respective businesses in the ordinary course substantially consistent with
past  practice and, to the extent  consistent  therewith,  use all  commercially
reasonable  efforts to preserve intact their current business  organizations and
their relationships with agents, brokers, insureds, reinsureds and other persons
having  business  dealings  with them.  Without  limiting the  generality of the
foregoing (but subject to the above exceptions), during the period from the date
of this Agreement to the Effective Time, or as may be required by law, Chartwell
shall not, and shall not permit any of its  subsidiaries  to,  without the prior
written consent of Trenwick:

                           (i)      (x) declare, set aside or pay any dividends
     on, or make any other distributions (whether in cash, stock or property) in
respect of, any of its  capital  stock  other than the  regular  quarterly  cash
dividends  of $.04 per share with respect to the  Chartwell  Common  Stock,  (y)
split,  combine or reclassify any of its capital stock or issue or authorize the
issuance of any other  securities  in respect of, in lieu of or in  substitution
for shares of its capital stock or (z) purchase, redeem or otherwise acquire any
shares of outstanding  capital stock of Chartwell or any of its  subsidiaries or
any other securities  thereof or any rights,  warrants or options to acquire any
such shares;

                           (ii) issue, deliver, sell, grant, pledge or otherwise
encumber or subject to any Lien, any shares of its capital stock, any other
voting securities or any securities convertible into, or any rights, warrants or
options to acquire, any such shares, voting securities or convertible securities
(other than (x) the  issuance of  Chartwell  Common  Stock upon the  exercise of
Stock Options, ESPP Stock Options,  Sharesave Stock Options or Warrants, in each
case,  outstanding as of the date hereof in accordance with their present terms,
(y) in accordance  with the Chartwell  Rights  Agreement and (z) the issuance of
Chartwell Common Stock pursuant to the Stock Option Agreement);

                           (iii) amend its certificate of incorporation,  bylaws
or other comparable organizational documents;

                                       43
<PAGE>

                           (iv)     (x) acquire (by merger, amalgamation,
consolidation   or  acquisition  of  stock  or  assets  or  otherwise)  any
corporation,   partnership,   joint  venture,   association  or  other  business
organization or division thereof or (y) make any material  investment  either by
purchase of stock or securities,  contributions or capital property, transfer or
acquisition including by lease of any material amount of assets or properties of
any other individual  entity,  except  acquisitions of investment  assets in the
ordinary course of business in accordance with Chartwell's investment guidelines
and consistent with past practice;

                           (v) sell,  lease,  mortgage or otherwise  encumber or
subject to any Lien or otherwise dispose of any of its properties or assets
(including   securitizations)   (collectively,    "Dispositions")   except   (a)
Dispositions  of  investment  assets  in the  ordinary  course  of  business  in
accordance  with  Chartwell's  investment  guidelines and  consistent  with past
practice  and (b)  Dispositions  of assets other than  investment  assets in the
ordinary  course  of  business  consistent  with  past  practice  and in no case
exceeding 1.0 million U.S. dollars;

                           (vi) (x) incur any indebtedness for borrowed money or
guarantee or otherwise  become  responsible  for any such  indebtedness  of
another  person other than pursuant to existing line of credit  arrangements  of
Chartwell or its  subsidiaries  and letters of credit and related  agreements of
Chartwell and its subsidiaries,  in each case in the ordinary course of business
consistent  with  past  practice  or (y) make any  loans,  advances  or  capital
contributions  to, or investments in, any other person,  other than to Chartwell
or to any direct or indirect  subsidiary of Chartwell  and  customary  loans and
advances to employees and as permitted under clause (iv);

                           (vii) make any tax  election or settle or  compromise
any income tax  liability  that  would  have a Material  Adverse  Effect on
Chartwell and its subsidiaries taken as a whole;

                           (viii) make any change in  accounting  principles  or
practices used by Chartwell or any of its subsidiaries materially affecting
its assets,  liabilities or business,  including any such change with respect to
establishment  of reserves for  unearned  premiums,  losses and loss  adjustment
expenses,  except for any such change required by reason of a concurrent  change
in GAAP or SAP or applicable U.K. accounting rules or principles;

                           (ix) make any material capital expenditure other than
in the  ordinary  course of  business  substantially  consistent  with past
practice and in each case not exceeding 1.0 million U.S. dollars;

                           (x) (A) enter into,  adopt,  amend  (except as may be
required  by law) or  terminate  any bonus,  profit-sharing,  compensation,
severance,  termination,  change in control,  consulting,  fringe benefit, stock
option,  stock  appreciation  right,  restricted stock,  performance unit, stock
equivalent,   stock   purchase   agreement,   pension,   retirement,    deferred
compensation,  employment, severance or other employee benefit agreement, trust,
plan,  fund,  award or other  arrangement  for the  benefit  or  welfare  of any
director,  officer  or  employee  in any  manner,  or (B)  except  for (x) merit
increases in salaries of  non-officer  employees at  regularly  scheduled  times
substantially  consistent with past practice and in each case not exceeding a 5%
increase in each  individual  non-officer  employee's  current salary and (y) as
required under existing  agreements or benefit plans set forth on Section 3.1(h)
of the Chartwell Disclosure  Schedule,  increase in any manner the compensation,
employee benefits or fringe benefits of any director, officer or employee;

                                       44
<PAGE>

                           (xi) enter into any  agreement  or  arrangement  that
limits or otherwise  restricts  Chartwell or any of its subsidiaries or any
successor thereto or that could, after the Effective Time, limit or restrict the
Surviving  Corporation and its affiliates  (including Trenwick) or any successor
thereto, from engaging or competing in any line of business or in any geographic
area;

                           (xii) settle or  compromise  any  derivative  suit or
other  litigation  or claim  arising out of the  transactions  contemplated
hereby,  or any other litigation or claim involving  Chartwell if the settlement
thereof  involves  payment  of in excess of  $100,000  (other  than  claims  for
contractual  benefits  under any insurance or  reinsurance  contract under which
Chartwell or any subsidiary of Chartwell is the insurer or reinsurer) which, for
purposes of this clause (xii),  prior written  consent of Trenwick  shall not be
unreasonably withheld;

                           (xiii)  take or allow to be taken or fail to take any
action which act or omission would jeopardize  qualification of the  Merger as a
"reorganization" with the meaning of Section 368(a)(1)(A) of the Code;

                           (xiv)  commute any  corporate  aggregate  excess loss
reinsurance contracts or arrangements of Chartwell or any of its Subsidiaries;or

                           (xv) authorize any of, or commit or agree to take any
of, the foregoing actions.

          In addition to, and notwithstanding,  the foregoing, Chartwell shall
cause the business of the Chartwell  Syndicates  which are the subject of a
proposal  for the merger of Chartwell  Syndicates  270,  741,  2741 and 544 into
Chartwell  Syndicate  839 for the 2000 Year of  Account  (set  forth in  Section
4.1(a) of the  Chartwell  Disclosure  Schedule,  the  "Lloyd's  Business  Plan")
previously  submitted  to Lloyd's by or on behalf of  Chartwell  to be conducted
substantially  as set forth in the Lloyd's  Business Plan, and shall not sell or
otherwise  transfer or dispose of all or any material portion of its interest in
any Chartwell Syndicate without the prior written consent of Trenwick.

          (b)   Conduct of Business by Trenwick. Except as specifically
contemplated by this Agreement or the Stock Option Agreement  (including as
set forth on Section  4.1 of the  Trenwick  Disclosure  Schedule),  or as may be
required  by law,  during  the  period  from the date of this  Agreement  to the
Effective Time,  Trenwick shall,  and shall cause its  subsidiaries to, carry on
their respective businesses in the ordinary course substantially consistent with
past  practice and, to the extent  consistent  therewith,  use all  commercially
reasonable  efforts to preserve intact their current business  organizations and
their relationships with agents, brokers, insureds, reinsureds and other persons
having  business  dealings  with them.  Without  limiting the  generality of the
foregoing (but subject to the above exceptions), during the period from the date
of this Agreement to the Effective Time, or as may be required by law,  Trenwick
shall not, and shall not permit any of its  subsidiaries  to,  without the prior
written consent of Chartwell:

                                       45

<PAGE>


                           (i)      (x) declare, set aside or pay any dividends
on, or make any other distributions (whether in cash, stock or property) in
respect of, any of its  capital  stock  other than the  regular  quarterly  cash
dividends  of $.26 per share with  respect to the  Trenwick  Common  Stock,  (y)
split,  combine or reclassify any of its capital stock or issue or authorize the
issuance of any other  securities  in respect of, in lieu of or in  substitution
for shares of its capital stock or (z) purchase, redeem or otherwise acquire any
shares of outstanding  capital stock of Trenwick or any of its  subsidiaries  or
any other securities  thereof or any rights,  warrants or options to acquire any
such shares;
                           (ii) issue, deliver, sell, grant, pledge or otherwise
encumber or subject to any Lien, any shares of its capital stock, any other
voting securities or any securities convertible into, or any rights, warrants or
options  to  acquire,   any  such  shares,   voting  securities  or  convertible
securities,  (other  than (x) the  issuance of  Trenwick  Common  Stock upon the
exercise of Trenwick Employee Stock Options outstanding as of the date hereof in
accordance  with their  present  terms and (y) in  accordance  with the Trenwick
Rights Agreement);

                           (iii) amend its certificate of incorporation,  bylaws
or other comparable organizational documents;

                           (iv)     (x) acquire (by merger, amalgamation,
consolidation   or  acquisition  of  stock  or  assets  or  otherwise)  any
corporation,   partnership,   joint  venture,   association  or  other  business
organization or division thereof or (y) make any material  investment  either by
purchase of stock or securities,  contributions or capital property, transfer or
acquisition including by lease of any material amount of assets or properties of
any other individual  entity,  except  acquisitions of investment  assets in the
ordinary course of business in accordance with Trenwick's  investment guidelines
and consistent with past practice.

                           (v) sell,  lease,  mortgage or otherwise  encumber or
subject to any Lien or otherwise dispose of any of its properties or assets
including   securitizations   )   (collectively,   "Dispositions")   except  (a)
Dispositions  of  investment  assets  in the  ordinary  course  of  business  in
accordance  with  Trenwick's  investment  guidelines  and  consistent  with past
practice  and (b)  Dispositions  of assets other than  investment  assets in the
ordinary  course  of  business  consistent  with  past  practice  and in no case
exceeding $1.0 million U.S. dollars;

                           (vi) (x) incur any indebtedness for borrowed money or
guarantee or otherwise become responsible for  any such indebtedness of another
person other than  pursuant to existing  line of credit arrangements of Trenwick
or its   subsidiaries   and   letters   of credit  and   related  agreements  of
Trenwick and its  subsidiaries,  in each case in the ordinary course of business
consistent  with  past  practice  or (y) make any  loans,  advances  or  capital
contributions to, or investments in, any other person, other than to Trenwick or
to any  direct or  indirect  subsidiary  of  Trenwick  and  customary  loans and
advances to employees and as permitted under clause (iv);


                                       46

<PAGE>

                           (vii) make any tax  election or settle or  compromise
any income tax liability that would have a Material Adverse Effect on Trenwick
and its subsidiaries taken as a whole;

                           (viii) make any change in  accounting  principles  or
practices used by Trenwick or any of its subsidiaries  materially affecting
its assets,  liabilities or business,  including any such change with respect to
establishment  of reserves for  unearned  premiums,  losses and loss  adjustment
expenses,  except for any such change required by reason of a concurrent  change
in GAAP or SAP or applicable U.K. accounting rules or principles;

                           (ix) make any material capital expenditure other than
in the  ordinary  course of  business  substantially  consistent  with past
practice and in no case exceeding 1.0 million U.S. dollars;

                           (x) (A) enter into,  adopt,  amend  (except as may be
required  by law) or  terminate  any bonus,  profit-sharing,  compensation,
severance,  termination,  change in control,  consulting,  fringe benefit, stock
option,  stock  appreciation  right,  restricted stock,  performance unit, stock
equivalent,   stock   purchase   agreement,   pension,   retirement,    deferred
compensation,  employment, severance or other employee benefit agreement, trust,
plan,  fund,  award or other  arrangement  for the  benefit  or  welfare  of any
director,  officer or employee in any manner,  or (B) except (x) merit increases
in salaries of non-officer  employees at regularly scheduled times substantially
consistent  with past practice and (y) as required under existing  agreements or
Trenwick  Benefit  Plans,  increase  in any  manner the  compensation,  employee
benefits or fringe benefits of any director, officer or employee;

                           (xi) enter into any  agreement  or  arrangement  that
limits or otherwise   restricts   Trenwick  or  any of  its  subsidiaries or any
successor thereto or that could, after the Effective Time, limit or restrict the
Surviving  Corporation and its affiliates (including Chartwell) or any successor
thereto, from engaging or competing in any line of business or in any geographic
area;

                           (xii) settle or  compromise  any  derivative  suit or
other  litigation  or claim  arising out of the  transactions  contemplated
hereby,  or any other  litigation or claim involving  Trenwick if the settlement
thereof  involves  payment  of in excess of  $100,000  (other  than  claims  for
contractual  benefits  under any insurance or  reinsurance  contract under which
Trenwick or any subsidiary of Trenwick is the insurer or reinsurer)  which,  for
purposes of this clause (xii),  prior written  consent of Chartwell shall not be
unreasonably withheld;

                           (xiii)  take or allow to be taken or fail to take any
action which act or omission would  jeopardize  qualification of the Merger
as a "reorganization" with the meaning of Section 368(a)(1)(A) of the Code;

                           (xiv) commute any corporate  aggregate excess of loss
reinsurance contracts or arrangements of Trenwick or any of its Subsidiaries; or

                           (xv)  authorize any of, or commit or agree to take
any of, the foregoing actions.


                                       47

<PAGE>

          (c)    Other  Actions.    Except as required by law,  and  subject  to
Section 4.2(a),  Chartwell and Trenwick shall  not, and  shall  not  permit any
of their respective  subsidiaries to, voluntarily take any action that would, or
that could  reasonably be expected to, result in (i) any of the  representations
and  warranties  of such party set forth in this  Agreement  or the Stock Option
Agreement  that are  qualified as to  materiality  being untrue at the Effective
Time, (ii) any of such  representations and warranties that are not so qualified
being untrue in any material  respect at the Effective Time, or (iii) any of the
conditions to the Merger set forth in Article VI not being satisfied.

          (d) Advice of Changes.  Chartwell and Trenwick shall  promptly  advise
the other party orally and in writing to the extent it has knowledge of (i)
any  representation  or warranty  made by it contained in this  Agreement or the
Stock Option  Agreement that is qualified as to materiality  becoming  untrue or
inaccurate in any respect or any such  representation or warranty that is not so
qualified  becoming  untrue or  inaccurate  in any  material  respect,  (ii) the
failure  by it to comply  in any  material  respect  with or to  satisfy  in any
material  respect any  covenant,  condition or agreement to be complied  with or
satisfied by it under this Agreement or the Stock Option Agreement and (iii) any
change or event having,  or which,  insofar as can reasonably be foreseen at the
time,  would  reasonably be expected to have a Material  Adverse  Effect on such
party or on the truth of their respective  representations and warranties or the
ability to satisfy the  conditions set forth in Article VI;  provided,  however,
that  no  such  notification  shall  affect  the  representations,   warranties,
covenants or agreements of the parties (or remedies with respect thereto) or the
conditions to the  obligations  of the parties under this Agreement or the Stock
Option Agreement.

          SECTION 4.2.   No Solicitation by Chartwell.

                  (a)  Chartwell  shall  not,  nor  shall it  permit  any of its
subsidiaries to, nor shall it authorize or permit any of its directors, officers
or employees or any investment banker, financial advisor,  attorney,  accountant
or other  representative  retained by it or any of its  subsidiaries  to, and it
shall use  commercially  reasonable  efforts to ensure that such  persons do not
directly or indirectly,  (i) solicit, initiate or encourage (including by way of
furnishing  non-public  information),  or take  any  other  action  designed  to
facilitate,  any inquiries or the making of any proposal which  constitutes  any
Chartwell  Takeover  Proposal  (as  defined  below) or (ii)  participate  in any
discussions or negotiations regarding any Chartwell Takeover Proposal; provided,
however,  that if at any time prior to Chartwell  Stockholder Approval the Board
of Directors of Chartwell  determines  in good faith,  after  consultation  with
outside  counsel,  that it is  necessary  to do so in order to  comply  with its
fiduciary duties to Chartwell's  stockholders  under  applicable law,  Chartwell
may, in response to a Chartwell Superior Proposal (as defined in Section 4.2(b))
which was not solicited by it or which did not otherwise result from a breach of
this  Section  4.2(a),  and subject to  providing  prior  written  notice of its
decision to take such action to Trenwick and compliance with Section 4.2(c), (x)
furnish information with respect to Chartwell and its subsidiaries to any person
making a Chartwell  Superior  Proposal  pursuant to a customary  confidentiality
agreement  (as  determined  by  Chartwell  after  consultation  with its outside
counsel) and (y)  participate  in  discussions  or  negotiations  regarding such
Chartwell Superior Proposal. For purposes of this Agreement, "Chartwell Takeover
Proposal"  means any inquiry,  proposal or offer from any person relating to any
direct or indirect acquisition or purchase of a business that constitutes 15% or
more  of  the  net  revenues,   net  income  or  assets  of  Chartwell  and  its
subsidiaries, taken as a whole, or 15% or more of any class of equity securities
of Chartwell or any of its subsidiaries, any tender offer or exchange offer that
if consummated would result in any person beneficially owning 15% or more of any
class of equity  securities  of  Chartwell  or any of its  subsidiaries,  or any
merger,  consolidation,  business  combination,  recapitalization,  liquidation,
dissolution or similar transaction involving Chartwell or any of its Significant
Subsidiaries,  other than the transactions contemplated by this Agreement or the
Stock Option Agreement.


                                       48

<PAGE>

                  (b) Except as expressly permitted by this Section 4.2, neither
the Board of Directors of Chartwell nor any committee thereof shall (i) withdraw
or modify,  or propose  publicly to withdraw or modify,  in a manner  adverse to
Trenwick,  the  approval or  recommendation  by such Board of  Directors or such
committee of this  Agreement  and the  transactions  contemplated  hereby,  (ii)
approve or recommend, or propose publicly to approve or recommend, any Chartwell
Takeover Proposal,  or (iii) cause Chartwell to enter into any letter of intent,
agreement in principle, acquisition agreement or other similar agreement (each a
"Chartwell  Acquisition  Agreement") related to any Chartwell Takeover Proposal.
Notwithstanding the foregoing, the Board of Directors of Chartwell may terminate
this  Agreement  (upon  payment to Trenwick of the  Termination  Fee required by
Section  5.14(b))  and  concurrently  with or after such  termination,  if it so
chooses,  cause Chartwell to enter into any Chartwell Acquisition Agreement with
respect to any  Chartwell  Superior  Proposal,  and  withdraw  its  approval and
recommendation to stockholders of the transactions contemplated hereby, but only
at a time that is after the fifth business day following  Trenwick's  receipt of
written  notice  advising  Trenwick  that the Board of Directors of Chartwell is
prepared to accept a Chartwell Superior Proposal,  specifying the material terms
and conditions of such Chartwell  Superior  Proposal and  identifying the person
making such Chartwell Superior  Proposal,  all of which information will be kept
confidential by Trenwick pursuant to the terms of the confidentiality agreement,
dated  May 20,  1998  between  Trenwick  and  Chartwell.  For  purposes  of this
Agreement,  a "Chartwell  Superior  Proposal" means any proposal made by a third
party to acquire, directly or indirectly,  including pursuant to a tender offer,
exchange offer, merger, consolidation,  business combination,  recapitalization,
liquidation, dissolution or similar transaction, for consideration consisting of
cash and/or securities, more than 50% of the combined voting power of the shares
of  Chartwell  Common Stock then  outstanding  or all or  substantially  all the
assets of  Chartwell  and  otherwise  on terms which the Board of  Directors  of
Chartwell  determines  in its good  faith  judgment  (based  on the  advice of a
financial advisor of nationally  recognized  reputation) to be more favorable to
Chartwell's  stockholders than this Agreement and the transactions  contemplated
hereby and for which  financing,  to the extent  required,  is then committed or
which,  in the good faith  judgment of the Board of Directors of  Chartwell,  is
reasonably capable of being obtained by such third party.

                  (c) In addition to the  obligations  of Chartwell set forth in
paragraphs (a) and (b) of this Section 4.2,  Chartwell shall immediately  advise
Trenwick  orally and in writing of any request for non-public  information or of
any  Chartwell  Takeover  Proposal,  the material  terms and  conditions of such
request or Chartwell  Takeover  Proposal  and the identity of the person  making
such  request or  Chartwell  Takeover  Proposal.  Chartwell  will keep  Trenwick
reasonably informed of the status and material details (including  amendments or
proposed  amendments) of any such request or Chartwell  Takeover  Proposal.  Any
such  information  provided to Trenwick  will be kept  confidential  by Trenwick
pursuant  to the  terms of the  confidentiality  agreement  dated  May 20,  1998
between Trenwick and Chartwell.

                                       49

<PAGE>

Nothing  contained in this Section 4.2 shall prohibit  Chartwell from taking and
disclosing  to  its  stockholders  a  position  contemplated  by  Rule  14e-2(a)
promulgated  under the Exchange Act or from making any disclosure to Chartwell's
stockholders  if,  in the good  faith  judgment  of the  Board of  Directors  of
Chartwell, after consultation with outside counsel, failure so to disclose would
be inconsistent with its obligations under applicable law.


                                   ARTICLE V

                              ADDITIONAL AGREEMENTS

          SECTION 5.1.  Preparation  of the Form S-4 and the Joint Proxy
     Statement.  As soon as is reasonably practicable following the date of this
Agreement,  Chartwell and Trenwick shall prepare and file with the SEC the Joint
Proxy  Statement  and a  registration  statement  of  Trenwick  on Form S-4 with
respect to the  transactions  contemplated by this Agreement.  Each of Chartwell
and Trenwick  shall use its  commercially  reasonable  efforts to have the Joint
Proxy  Statement  cleared  by the SEC  under the  Exchange  Act and the Form S-4
declared  effective  under the Securities  Act as promptly as practicable  after
such filing. Chartwell will use its commercially reasonable efforts to cause the
Joint Proxy  Statement to be mailed to  Chartwell's  stockholders,  and Trenwick
will use its commercially  reasonable efforts to cause the Joint Proxy Statement
to be mailed to Trenwick's stockholders, in each case as promptly as practicable
after the Form S-4 is declared  effective  under the  Securities  Act.  Trenwick
shall  also  take any  action  (other  than  qualifying  to do  business  in any
jurisdiction in which it is not now so qualified or to file a general consent to
service of process)  required to be taken under any applicable  state securities
laws in connection  with the issuance of Trenwick Common Stock in the Merger and
Chartwell   shall  furnish  all   information   concerning   Chartwell  and  its
stockholders as may be reasonably  requested in connection with any such action.
No filing of, or  amendment  or  supplement  to, the Form S-4 or the Joint Proxy
Statement  will be made by Trenwick or  Chartwell  without  providing  the other
parties the  opportunity  to review and comment  thereon.  Trenwick  will advise
Chartwell,  promptly after it receives notice thereof, of the time when the Form
S-4 has become  effective or any  supplement  or amendment  has been filed,  the
issuance of any stop order,  the  suspension  of the  qualification  of Trenwick
Common Stock issuable in connection  with the Merger for offering or sale in any
jurisdiction,  or any  request  by the  SEC for  amendment  of the  Joint  Proxy
Statement or the Form S-4 or comments  thereon or responses  thereto or requests
by the SEC for  additional  information.  If at any time prior to the  Effective
Time  any  information  relating  to  Trenwick  or  Chartwell,  or any of  their
respective affiliates,  officers or directors,  should be discovered by Trenwick
or Chartwell  which should be set forth in an amendment or  supplement to any of
the Form S-4 or Joint  Proxy  Statement,  so that any such  documents  would not
include any  misstatement  of a material fact or omit to state any material fact
necessary to make the statements  therein,  in light of the circumstances  under
which  they  were  made,  not  misleading,   the  party  which  discovered  such
information  shall  promptly  notify the other party  hereto and an  appropriate
amendment or supplement describing such information shall be promptly filed with
the SEC and, to the extent required by law,  disseminated to the stockholders of
Trenwick and Chartwell.

                                       50
<PAGE>


          SECTION 5.2.   Stockholder Approval.

                  (a) Chartwell,  acting through its Board of Directors,  shall,
in accordance with applicable law and Chartwell's  Certificate of  Incorporation
and By-laws,  (i) convene a meeting of its  stockholders  as soon as practicable
after the date of this  Agreement  to consider  and vote on the approval of this
Agreement and the Merger (the "Chartwell Stockholders Meeting") and (ii) subject
to the  fiduciary  duties  of its  Board  of  Directors  to  stockholders  under
applicable law, (A) solicit proxies from its stockholders to obtain the approval
of its stockholders  with respect to this Agreement and (B) include in the Joint
Proxy Statement the  recommendation  of the Board of Directors of Chartwell that
the  stockholders  of Chartwell  vote in favor of the approval of this Agreement
and the Merger.

                  (b) Trenwick, acting through its Board of Directors, shall, in
accordance   with  applicable  law  and  Trenwick's   Restated   Certificate  of
Incorporation and By-laws,  (i) convene a meeting of its stockholders as soon as
practicable  after  the  date of this  Agreement  to  consider  and  vote on the
approval of the issuance of Trenwick  Common Stock in the Merger (the  "Trenwick
Stockholders Meeting"), (ii) solicit proxies from its stockholders to obtain the
approval of its stockholders with respect thereto and (iii) include in the Joint
Proxy  Statement the  recommendation  of the Board of Directors of Trenwick that
the stockholders of Trenwick vote in favor of such issuance.

                  (c) Chartwell and Trenwick shall coordinate and cooperate with
respect to the timing of such meetings and shall  endeavor to hold such meetings
on the same day and as soon as practicable after the date hereof.

          SECTION 5.3.    Access to  Information;   Confidentiality.  Each of
Chartwell  and   Trenwick  shall,  and shall  cause  each of  its   respective
subsidiaries  to,  afford to the other  party  and to the  officers,  employees,
counsel,  financial  advisors  and other  representatives  of such other  party,
reasonable  access during normal  business  hours during the period prior to the
Effective Time to all its respective properties, books, contracts,  commitments,
personnel  and records and,  during such period,  each of Chartwell and Trenwick
shall,  and shall  cause  each of its  respective  subsidiaries  to,  furnish as
promptly as practicable to the other party (a) a copy of each report,  schedule,
registration  statement  and  other  document  filed by it  during  such  period
pursuant to the  requirements of domestic or foreign federal or state securities
or  insurance  laws  and (b) all  other  information  concerning  its  business,
properties  and  personnel as such other party may from time to time  reasonably
request.  Trenwick will hold, and will cause its  subsidiaries and each of their
respective directors, officers, employees, counsel, financial advisors and other
representatives and affiliates to hold, any non-public information in confidence
to the extent  required  by,  and in  accordance  with,  the  provisions  of the
existing  confidentiality  agreement,  dated May 20, 1998,  between Trenwick and
Chartwell,  and Chartwell will hold, and will cause its subsidiaries and each of
their respective directors, officers, employees, counsel, financial advisors and
other  representatives  and affiliates to hold,  any  non-public  information in
confidence to the extent required by, and in accordance  with, the provisions of
the confidentiality agreement dated May 26, 1998, between Chartwell and Trenwick
(collectively, the "Confidentiality Agreements").

                                       51

<PAGE>


          SECTION 5.4.  Commercially  Reasonable Efforts.  Upon the terms and
subject to the conditions and other agreements set forth  in  this  Agreement,
each of the parties agrees to use its commercially  reasonable  efforts to take,
or cause to be taken, all actions, and to do, or cause to be done, and to assist
and cooperate with the other parties in doing, all things  necessary,  proper or
advisable to  consummate  and make  effective,  in the most  expeditious  manner
practicable,  the  Merger  and  the  other  transactions  contemplated  by  this
Agreement and the Stock Option Agreement.  Nothing set forth in this Section 5.4
will limit or affect actions permitted to be taken pursuant to Section 4.2.

          SECTION 5.5. Benefit Plans.

                  (a)  Trenwick  will cause those  employees of Chartwell or its
subsidiaries who are employed at the Effective Time by the Surviving Corporation
or its subsidiaries  (the  "Continuing  Employees") to be provided with employee
benefits  other than  severance  benefits  which are covered in clause (b) below
which are no less  favorable in the aggregate  than those  benefits  provided to
other similar situated employees of Trenwick and its subsidiaries.

                  For  purposes of the  employee  benefits to be provided to the
Continuing  Employees,  solely to the extent permissible  pursuant to applicable
law,  Trenwick  will cause the  Continuing  Employees to receive full credit for
purposes  of  eligibility  and  vesting  (but  not  benefit  accrual)  for  such
Continuing  Employees'  service with Chartwell or its subsidiaries  prior to the
Effective  Time.  Such service also shall apply for purposes of  satisfying  any
waiting periods,  evidence of insurability  requirements,  or the application of
any preexisting condition limitation.

                  (b) Trenwick shall provide, or cause the Surviving Corporation
to provide,  severance  benefits to  Continuing  Employees  whose  employment is
terminated  without  cause by Trenwick or its  subsidiaries  during the one year
period  following  the  Effective  Time,  which  severance  benefits are no less
favorable  in the  aggregate  than those  severance  benefits  provided to other
similarly situated employees of Trenwick or its subsidiaries, giving full credit
to  the  Continuing  Employees  for  time  of  service  with  Chartwell  or  its
subsidiaries.

          SECTION 5.6. Indemnification and Insurance.

                  (a) From and after the Effective Time, Trenwick agrees that it
will  indemnify  and hold  harmless  each person who is, or has been at any time
prior to the date hereof or who becomes prior to the Effective  Time, an officer
or director of Chartwell or any of its subsidiaries (the "Indemnified Parties"),
in respect of acts or  omissions  occurring  on or prior to the  Effective  Time
(including but not limited to the transactions  contemplated by this Agreement),
to the same extent provided under the Certificate of  Incorporation  and By-laws
of  Chartwell  or the  certificate  of  incorporation  or  bylaws  of  any  such
subsidiary as in effect on the date hereof;  provided, that such indemnification
shall be subject to any  limitation  imposed from time to time under  applicable
law.  The  Indemnified  Parties  shall be  entitled to  advancement  of expenses
provided  such  Indemnified  Party  provides  Trenwick  with an  undertaking  to
reimburse  Trenwick in a form comparable to the undertaking  provided for by the
DGCL. Any  determination to be made as to whether any Indemnified  Party has met
any standard of conduct imposed by law shall be made by legal counsel reasonably
acceptable to such Indemnified Party and the Surviving Corporation,  retained at
the Surviving Corporation's expense.

                                       52

<PAGE>


                  (b)  Trenwick  will  cause to be  maintained  in effect  for a
period of not less than six years from the Effective Time the current directors'
and  officers'   liability   insurance,   fiduciary   liability   insurance  and
indemnification  policies  maintained by Chartwell and its  subsidiaries  to the
extent that such  policies  provide  coverage for any matter  existing or act or
omission  occurring on or prior to the Effective Time (the "D&O  Insurance") for
all current or former  directors,  officers or  employees  of  Chartwell  or any
subsidiary on the date of this Agreement, so long as the annual premium therefor
would not be in excess of two hundred  percent (200%) of the last annual premium
paid prior to the date of this  Agreement  (200% of such  premium,  the "Maximum
Premium");  provided,  however,  that Trenwick may, in lieu of maintaining  such
existing D&O Insurance as provided above, cause no less favorable coverage to be
provided  under any  policy  maintained  for the  benefit of the  directors  and
officers of Trenwick or any of its  subsidiaries,  so long as (i) the  insurance
company  providing  such coverage has an A.M. Best Company rating of A or better
and (ii) the material terms thereof are no less  advantageous  than the existing
D&O Insurance. If the existing D&O Insurance expires, is terminated or cancelled
or if the annual  premium would exceed the Maximum  Premium during such six-year
period, Trenwick will use reasonable efforts to cause to be obtained as much D&O
Insurance as can be obtained for the  remainder of such period for an annualized
premium not in excess of the Maximum  Premium,  on terms and  conditions no less
advantageous  than  the  existing  D&O  Insurance  to  the  extent  commercially
available.  Section 5.6 (b) of the Chartwell  Disclosure Schedule sets forth the
amount of Maximum Premium.

                  (c) The provisions of this Section 5.6 are in addition to, and
not in  substitution  for any other  rights that an  Indemnified  Party may have
under the applicable  certificate of  incorporation  or by-laws of or agreements
with Chartwell or any of its  subsidiaries  or under  applicable  law.  Trenwick
agrees to pay all costs and  expenses  (including  fees and expenses of counsel)
that may be incurred by any  Indemnified  Party in  successfully  enforcing  the
indemnity  or other  obligations  under this  Section.  The  provisions  of this
Section  shall survive the Merger and are intended to be for the benefit of, and
shall be enforceable by, each of the Indemnified Parties,  their heirs and their
representatives.

                  (d) In the event that  Trenwick  or any of its  successors  or
assigns (i)  consolidates  with or merges  into any other  person and is not the
continuing or surviving corporation or entity of such consolidation or merger or
(ii) transfers or conveys all or substantially  all of its properties and assets
to any person,  then,  and in each such case,  proper  provision will be made so
that the successors and assigns of Trenwick  assume the obligations set forth in
this Section 5.6.

          SECTION 5.7.   Public  Announcements.  Trenwick and  Chartwell  will
consult  with   each  other  before  issuing,   and   provide   each  other the
opportunity to review,  comment upon, and concur with any press release or other
public  statements  with  respect  to  the  transactions  contemplated  by  this
Agreement,  including the Merger and the Stock Option  Agreement,  and shall not
issue any such press  release or make any such  public  statement  prior to such
consultation,  except as either party may  determine  is required by  applicable
law, court process or by obligations  pursuant to any listing agreement with any
national  securities  exchange or authorized  interdealer  quotation system. The
parties  agree that the initial  press  release to be issued with respect to the
transactions contemplated by this Agreement and the Stock Option Agreement shall
be in the form hereto agreed by the parties.

                                       53

<PAGE>

          SECTION 5.8.   Consents,    Approvals and Filings.   (a) Chartwell and
Trenwick  will make  and  cause   their   respective   subsidiaries  to make all
necessary registrations and filings, as promptly as practicable, including those
required  under  the HSR Act,  the  Securities  Act,  the  Exchange  Act,  state
securities  laws  and  state  insurance  laws,  in order  to  facilitate  prompt
consummation  of  the  Merger,   the  Stock  Option   Agreement  and  the  other
transactions contemplated by this Agreement. In addition, Chartwell and Trenwick
will each use their commercially  reasonable  efforts,  and will cooperate fully
with each other (i) to comply as promptly as practicable  with all  governmental
requirements  applicable to the Merger, the Stock Option Agreement and the other
transactions  contemplated by this Agreement,  and (ii) to obtain as promptly as
practicable  all  necessary  permits,  orders or other  consents,  approvals  or
authorizations  from, or to avoid an action or proceeding  by, any  Governmental
Entity and  consents,  approvals  or waivers from all third  parties  (including
Lloyd's)  necessary in connection with the consummation of the Merger, the Stock
Option Agreement and the other transactions contemplated by this Agreement. Each
of  Chartwell  and Trenwick  shall use its  commercially  reasonable  efforts to
provide such information and communications to Governmental Entities and Lloyd's
as they may reasonably request.

                  (b) Each of the  parties  shall  provide  to the  other  party
copies of all  applications  or other  communications  in  advance  of filing or
submission of such applications or  communications  to Governmental  Entities or
Lloyd's in  connection  with this  Agreement.  Trenwick  shall give to Chartwell
prompt written notice if it receives any notice or other  communication from any
Insurance Regulator or Lloyd's in connection with the transactions  contemplated
by this Agreement, and, in the case of any such notice or communication which is
in writing,  shall promptly furnish  Chartwell with a copy thereof.  Each of the
parties shall give to the other party  reasonable  prior  written  notice of the
time and place when any meetings may be held by it with Insurance  Regulators or
Lloyd's in connection with the transactions  contemplated by this Agreement, and
the  party to whom such  notice  shall be given  shall  have the right to have a
representative or representatives present at any such meeting.

                  (c)  Chartwell  shall  give  prompt  notice to  Trenwick,  and
Trenwick  shall give prompt notice to Chartwell,  of (i) any  representation  or
warranty  made  by it  contained  in this  Agreement  that  is  qualified  as to
materiality   becoming   untrue  or  inaccurate  in  any  respect  or  any  such
representation  or  warranty  that  is  not  so  qualified  becoming  untrue  or
inaccurate  in any material  respect or (ii) the failure by it to comply with or
satisfy in any  material  respect any  covenant,  condition  or  agreement to be
complied with or satisfied by it under this Agreement;  provided,  however, that
no such notification shall affect the representations,  warranties, covenants or
agreements of the parties or the  conditions to the  obligations  of the parties
under this Agreement.

          SECTION 5.9.   NASDAQ  Approval.  Trenwick shall use its reasonable
best  efforts to cause the shares of Trenwick  Common Stock to be issued in
the Merger  and the other  transactions  contemplated  by this  Agreement  to be
approved for listing on the NASDAQ National  Market,  subject to official notice
of issuance,  as promptly as practicable  after the date hereof and in any event
prior to the Effective Time.

                                       54

<PAGE>

          SECTION 5.10.  Affiliates and  Certain  Stockholders.   Prior  to  the
Closing Date,  Chartwell  shall deliver  to  Trenwick  a  list  identifying  all
persons who are, at the time of the Chartwell Stockholders Meeting, "affiliates"
of Chartwell for purposes of Rule 145 under the Securities Act.  Chartwell shall
furnish such  information  and documents as Trenwick may reasonably  request for
the  purpose  of  reviewing  such  list.  Chartwell  shall use its  commercially
reasonable  efforts to cause each such person to execute and deliver to Trenwick
on or prior to the Closing Date a written  agreement in a form  satisfactory  to
Trenwick (an "Affiliate Agreement"),  that such person will not offer or sell or
otherwise  dispose of any of the shares of Trenwick  Common Stock issued to such
person pursuant to the Merger in violation of the Securities Act or the rules or
regulations  promulgated by the SEC thereunder.  The  certificates  representing
Trenwick  Common Stock  received by such  affiliates  in the Merger shall bear a
customary legend regarding applicable  Securities Act transfer  restrictions and
the provisions of this Section 5.10.

          SECTION 5.11.  Tax Matters. Trenwick and Chartwell shall each use  all
reasonable efforts to cause the  Merger to  qualify  as a  reorganization  under
the  provisions of Section  368(a)(1) of the Code,  and neither shall  knowingly
take,  nor shall it permit any  subsidiary  knowingly  to take,  any action that
would jeopardize such treatment.

          SECTION 5.12.   Letters of  Accountants.   (a) Chartwell shall use its
reasonable  efforts  to  cause to be  delivered  to  Trenwick  two  letters from
Chartwell's independent  accountants,  one dated a date within two business days
before  the date on which the Form S-4 shall  become  effective  and one dated a
date within two  business  days before the  Effective  Time,  each  addressed to
Trenwick,  in  form  and  substance  reasonably  satisfactory  to  Trenwick  and
customary in scope and substance for comfort  letters  delivered by  independent
public  accountants in connection with  registration  statements  similar to the
Form S-4.

                  (b) Trenwick shall use its  reasonable  efforts to cause to be
delivered to Chartwell two letters from Trenwick's independent accountants,  one
dated a date  within  two  business  days  before the date on which the Form S-4
shall become  effective and one dated a date within two business days before the
Effective  Time, each addressed to Chartwell,  in form and substance  reasonably
satisfactory  to  Chartwell  and  customary in scope and  substance  for comfort
letters  delivered  by  independent   public   accountants  in  connection  with
registration statements similar to the Form S-4.

          SECTION 5.13.  Stockholder Litigation. Each of Chartwell and Trenwick
shall (to the extent  their  interests  do not  diverge)  cooperate  in the
defense of any litigation against Chartwell or Trenwick, as applicable,  and its
directors  and  officers  relating  to the  transactions  contemplated  by  this
Agreement and the Stock Option Agreement.

          SECTION 5.14.  Fees and Expenses.  (a) Except as  provided  in this
Section  5.14,  all  fees  and  expenses  incurred  in  connection  with  this
Agreement, the Stock Option Agreement and the transactions  contemplated by this
Agreement and the Stock Option  Agreement  shall be paid by the party  incurring

                                       55

<PAGE>


such fees or  expenses,  whether or not the Merger is  consummated,  except that
each of  Chartwell  and  Trenwick  shall bear and pay  one-half of the costs and
expenses incurred in connection with (1) the filing, printing and mailing of the
Form S-4 and the Joint Proxy  Statement  (including SEC filing fees) and (2) the
filings  of the  premerger  notification  and  report  forms  under  the HSR Act
(including  filing fees).  Each of Chartwell and Trenwick  shall file any return
with  respect  to,  and shall  pay,  any  state or local  taxes  (including  any
penalties or interest with respect  thereto),  if any, which are attributable to
the  transfer of the  beneficial  ownership of real  property of  Chartwell  and
Trenwick  (collectively,  the "Real Estate  Transfer  Taxes") as a result of the
transactions  contemplated  by this  Agreement.  Trenwick  and  Chartwell  shall
cooperate with each other in the filing of such returns,  including supplying in
a timely manner a complete list of all real  property  interests  held by it and
any  information  with respect to such property that is reasonably  necessary to
complete such returns. The fair market value of any real property of Trenwick or
Chartwell  subject  to the Real  Estate  Transfer  Taxes  shall be as  agreed to
between Chartwell and Trenwick.

                  (b) In the event that (w) the Board of  Directors of Chartwell
shall terminate this Agreement  pursuant to Section  7.1(c)(ii)  hereof, (x) the
Board of  Directors  of Trenwick  shall  terminate  this  Agreement  pursuant to
Section 7.1(d)(ii),  (y) the Board of Directors of Trenwick shall terminate this
Agreement  pursuant to Section  7.1(d)(iii)  hereof or the Board of Directors of
Chartwell shall terminate this Agreement pursuant to Section  7.1(c)(iii) and in
either  case  there  shall  have been made or  commenced  a  Chartwell  Takeover
Proposal (other than the Merger) with respect to Chartwell,  or (z) the Board of
Directors  of  Trenwick  shall  terminate  this  Agreement  pursuant  to Section
7.1(d)(i) and within one year of such termination,  Chartwell shall have entered
into a definitive agreement with respect to a Chartwell Superior Proposal,  then
Chartwell shall, as a condition  precedent to such termination of this Agreement
in the cases of clauses  (w),  (x),  (y) above,  and,  in the case of (z) above,
within 24 hours of such event,  pay to Trenwick  $6.5 million U.S.  dollars (the
"Termination Fee") in cash by wire transfer of same day funds.

                  (c) If the Board of Directors of Trenwick shall terminate this
Agreement  pursuant to Section 7.1(d)(i) then Chartwell shall pay or cause to be
paid to Trenwick on the date of such  termination  $2.0 million U.S.  dollars in
respect of liquidated damages;  provided,  however, that such liquidated damages
shall  be  credited   towards  any  Termination  Fee  that  becomes  payable  as
contemplated by Section  5.14(b)(z) hereof. If within 1 year of such termination
Chartwell  shall have  entered  into a  definitive  agreement  with respect to a
Chartwell  Superior  Proposal,  such that the  Termination  Fee  contemplated by
Section 5.14(b)(z) shall become payable,  the  aforementioned  $2.0 million U.S.
dollars  in  liquidated  damages  shall  be  allowed  as a credit  against  such
Termination Fee.

                  (d) Chartwell  acknowledges  that the agreements  contained in
this Section  5.14(b) are an integral part of the  transactions  contemplated by
this Agreement,  and that,  without these  agreements,  Trenwick would not enter
into this Agreement;  accordingly, if Chartwell fails promptly to pay the amount
due  pursuant  to this  Section  5.14,  and,  in order to obtain  such  payment,
Trenwick  commences a suit which results in a judgment against Chartwell for the
fee set forth in this Section  5.14,  Chartwell  shall pay to Trenwick its costs
and expenses  (including  attorneys'  fees and expenses) in connection with such
suit,  together  with  interest  on the  amount of the fee at the prime  rate as
reported in the Wall Street  Journal on the date such payment was required to be
made.

                                       56
<PAGE>


          SECTION  5.15.      Reinsurance  Agreement.  Chartwell  shall use  its
commercially reasonable efforts to obtain  not  later  than the  Effective  Time
the  Reinsurance  Agreement  on the  terms set  forth in  Section  3.1(z) of the
Chartwell Disclosure Schedule.

                                   ARTICLE VI

                              CONDITIONS PRECEDENT

          SECTION 6.1.   Conditions to Each Party's Obligation To Effect the
Merger.  The  respective  obligation  of each party to effect the Merger is
subject to the  satisfaction  or waiver on or prior to the  Closing  Date of the
following conditions:

          (a) Stockholder  Approval.  Each of the Chartwell Stockholder Approval
and the Trenwick Stockholder Approval shall have been obtained.

          (b) Governmental,  Regulatory and Lloyd's  Consents.  All filings
required to be made prior to the  Effective  Time with,  and all  consents,
approvals,  permits and  authorizations  required  to be  obtained  prior to the
Effective  Time from,  Governmental  Entities  or  Lloyd's,  including,  without
limitation,  those set forth in  Sections  3.1(d) and  3.2(d) of the  Disclosure
Schedule,  in connection  with the execution and delivery of this  Agreement and
the  consummation  of the  transactions  contemplated  hereby by  Chartwell  and
Trenwick  shall  have  been  made or  obtained  (as the case may be);  provided,
however,  that such  consents,  approvals,  permits  and  authorizations  may be
subject to conditions customarily imposed by insurance regulatory authorities or
Lloyd's and other  conditions that are consistent with the parties'  obligations
to use commercially reasonable efforts to complete the transactions contemplated
hereby.

          (c) HSR Act. The waiting period (and any extension thereof) applicable
to the  Merger  under  the HSR Act  shall  have been  terminated  or shall  have
expired.

          (d) No  Injunctions  or  Restraints.  No  preliminary  or permanent
injunction,  judgment,  order,  decree,  statute,  law, ordinance,  rule or
regulation,  entered,  enacted,  promulgated,  enforced  or issued by any court,
arbitrator,  Insurance  Regulator  or any other  Government  Entity of competent
jurisdiction   or  other   legal   restraint   or   prohibition   (collectively,
"Restraints")  shall be in effect (i) preventing the  consummation of the Merger
or any of the  transactions  contemplated by this Agreement (ii)  prohibiting or
limiting  the  ownership  or  operation  by  Trenwick  or  Chartwell  and  their
respective  subsidiaries  of any  material  portion of the business or assets of
Trenwick or Chartwell and their respective subsidiaries taken as a whole, in the
event that the Merger or any of the transactions  contemplated by this Agreement
is consummated as contemplated hereby, or (iii) compelling Trenwick or Chartwell
and their  respective  subsidiaries  to dispose of or hold separate any material
portion of the business or assets of Trenwick or Chartwell and their  respective
subsidiaries  taken as a whole, in the event that the Merger or any of the other
transactions  contemplated  by this  Agreement is  consummated  as  contemplated
hereby; provided, however, that the party invoking the condition shall have used
reasonable  efforts to prevent the entry of any such Restraints and to appeal as
promptly as possible any such Restraints that may be entered.

                                       57
<PAGE>


          (e) Form S-4. The Form S-4 shall have become  effective under the
Securities Act and shall not be the  subject  of any stop order or  proceedings
seeking a stop order.

          (f) NASDAQ.  The shares of Trenwick  Common Stock to be issued in the
Merger and the other transactions contemplated by this Agreement shall have been
approved for trading on NASDAQ, subject to official notice of issuance.

          (g) Third-Party Consents.  All consents and waivers of third parties
(other than  Governmental  Entities) to the  consummation of the Merger and
the  transactions  contemplated  by this Agreement that are set forth in Section
3.1(d)  of  the  Chartwell  Disclosure  Schedule  and  3.2(d)  of  the  Trenwick
Disclosure  Schedule  shall have been obtained,  other than those which,  if not
obtained  do not  have,  and are not  likely  to  have,  individually  or in the
aggregate, a Material Adverse Effect on Trenwick or Chartwell.

          SECTION 6.2.   Conditions to Obligation of Trenwick.  The obligation
of Trenwick to effect the Merger is further subject to the  satisfaction or
waiver  by  Trenwick  at or  prior  to  the  Effective  Time  of  the  following
conditions:

          (a)    Representations  and   Warranties.   The  representations   and
warranties of Chartwell  set forth  herein,  shall be true  and  correct  as  of
the date of this Agreement and as of the Effective Time as though made on and as
of the  Effective  Time  (except to the extent  expressly  made as of an earlier
date,  in  which  case  as of such  date),  except  where  the  failure  of such
representations  and warranties to be so true and correct (without giving effect
to any limitation as to  "materiality"  or "material  adverse  effect" set forth
therein)  does not  have,  and is not  likely  to have,  individually  or in the
aggregate,  a Material  Adverse  Effect on  Chartwell,  and Trenwick  shall have
received a certificate  signed on behalf of Chartwell by an executive officer of
Chartwell to the effect set forth in this paragraph.

          (b)  Performance of Obligations of Chartwell.  Chartwell shall have
performed in all material respects all obligations required to be performed
by it under this  Agreement at or prior to the Closing Date,  and Trenwick shall
have  received  a  certificate  signed on behalf of  Chartwell  by an  executive
officer of Chartwell to such effect.

          (c) Tax  Opinion.  Trenwick  shall have  received  an opinion of its
special tax counsel,  Baker & McKenzie, in form and substance  satisfactory
to Trenwick,  dated the  Effective  Time,  to the effect that the Merger will be
treated as a  reorganization  under Section  368(a)(1) of the Code. In rendering
its opinion pursuant to this Section 6.2(c),  Baker & McKenzie shall be entitled
to rely upon representations of officers of Chartwell and Trenwick.

          (d) No Material  Adverse  Change.  At any time after the date of this
Agreement  there  shall  not have  occurred  any  Material  Adverse  Change
relating  to  Chartwell;  provided,  that  this  condition  shall no  longer  be
applicable following the Chartwell Stockholder Approval.

                                       58

<PAGE>

          (e) Ratings. None of the  claims-paying or financial strength  ratings
assigned by  A.M. Best & Co.  or Standard & Poor's   Corporation  to  Chartwell
or its Subsidiaries, as in effect on the date of this Agreement, shall have been
lowered  on or prior  to the  Effective  Time  (other  than as a  result  of the
announcement or consummation of the transactions  contemplated  hereby),  and no
such ratings shall have been placed on credit watch with  negative  implications
(other than as a result of the  announcement or consummation of the transactions
contemplated hereby) without being reversed on or prior to the Effective Time.

          (f)  Reinsurance  Agreement.  Chartwell  shall  have  obtained  the
Reinsurance Agreement which shall be effective at the Effective Time.

          (g) Opinion.Trenwick shall have received the opinion of LeBoeuf, Lamb,
Greene & MacRae, L.L.P., in the form set forth as Exhibit 6.2(g) hereto, to
the effect that the Merger will not  constitute a "change of control" as defined
in the Contingent Interest Notes Indenture.

          SECTION  6.3   Conditions to Obligation of Chartwell. The  obligation
of Chartwell to effect the Merger is further subject to the satisfaction or
waiver  by  Chartwell  at or  prior  to the  Effective  Time  of  the  following
conditions:

          (a)    Representations  and  Warranties.  The   representations  and
warranties  of Trenwick set forth  herein,  shall  be  true and correct  as of
the date of this Agreement and as of the Effective Time as though made on and as
of the  Effective  Time  (except to the extent  expressly  made as of an earlier
date,  in  which  case  as of  such  date)  except  where  the  failure  of such
representations  and warranties to be so true and correct (without giving effect
to any limitation as to  "materiality"  or "material  adverse  effect" set forth
therein)  does not  have,  and is not  likely  to have,  individually  or in the
aggregate,  a Material  Adverse  Effect on Trenwick,  and  Chartwell  shall have
received a certificate  signed on behalf of Trenwick by an executive  officer of
Trenwick to the effect set forth in this paragraph.

         (b) Performance of Obligations of Trenwick. Trenwick shall have
performed in all material respects all obligations required to be performed
by it under this Agreement at or prior to the Closing Date, and Chartwell  shall
have received a certificate signed on behalf of Trenwick by an executive officer
of Trenwick to such effect.

          (c) Tax  Opinion.  Chartwell  shall have  received  an opinion  of its
counsel,  LeBoeuf,  Lamb,  Greene & MacRae,  L.L.P.,  in form and substance
satisfactory  to  Chartwell,  dated the  Effective  Time, to the effect that the
Merger will be treated as a reorganization  under Section 368(a)(1) of the Code.
In giving such opinion, LeBoeuf, Lamb, Greene & MacRae, L.L.P. shall be entitled
to rely upon representations of officers of Trenwick and Chartwell.

          (d) Material Adverse Change. At any time after the date of this
Agreement, there shall not have occurred any Material Adverse Change relating to
Trenwick.

          (e) Ratings.   None of the claims-paying or financial strength ratings
assigned by A.M. Best & Co. or Standard & Poor's Corporation to Trenwick or
its  Subsidiaries,  as in effect on the date of this Agreement,  shall have been
lowered  on or prior  to the  Effective  Time  (other  than as a  result  of the
announcement or consummation of the transactions  contemplated  hereby),  and no
such ratings shall have been placed on credit watch with  negative  implications
(other than as a result of the  announcement or consummation of the transactions
contemplated hereby) without being reversed on or prior to the Effective Time.

                                       59

<PAGE>

                                   ARTICLE VII

                        TERMINATION, AMENDMENT AND WAIVER

SECTION  7.1.    Termination.  Anything  herein  contained  or  elsewhere to the
contrary  notwithstanding,  this  Agreement  may be  terminated  and the  Merger
contemplated  herein may be abandoned at any time prior to the  Effective  Time,
whether  before or after the  Chartwell  Stockholder  Approval  or the  Trenwick
Stockholder Approval:

                  (a)    By the mutual written consent of the Board of Directors
of Trenwick and the Board of Directors of Chartwell;

                  (b)    By the written notice by either of the Board of
Directors of Trenwick or of the Board of Directors of Chartwell:

                           (i)     if the Merger shall not have become effective
on or  before  December  31,  1999;  provided,  however,  that the right to
terminate this Agreement under this Section  7.1(b)(i) shall not be available to
any party whose failure to fulfill any obligation  under this Agreement has been
the cause of, or resulted  in, the failure of the Merger to occur on or prior to
such date;

                           (ii)  if  Trenwick   fails  to  obtain  the  required
approval of its stockholders at the Trenwick Stockholders
Meeting; or

                           (iii) if any Governmental Entity shall have issued an
order,  decree or ruling or taken any other action  (which  order,  decree,
ruling  or  other  action  the  parties  hereto  shall  use  their  commercially
reasonable efforts to lift) in each case permanently  restraining,  enjoining or
otherwise  prohibiting the transactions  contemplated by this Agreement and such
order, decree, ruling or other action shall have become final and nonappealable;

                  (c)      By the Board of Directors of Chartwell:

                           (i)  if Trenwick (x) breaches or fails in any
material  respect to perform or comply with any of its  material  covenants
and  agreements  contained  herein  or  (y)  breaches  its  representations  and
warranties  in any  material  respect  and such  breach  would  have or would be
reasonably  likely  to  have a  Material  Adverse  Effect  on  Trenwick  and its
subsidiaries, in each case such that the conditions set forth in Section 6.1 and
Section 6.3 would not be  satisfied;  provided,  however,  that if any breach is
curable by the breaching  party  through the exercise of the  breaching  party's
best efforts and for so long as the  breaching  party shall be so using its best
efforts to cure such breach, Chartwell may not terminate this Agreement pursuant
to this Section 7.1(c)(i);

                                       60

<PAGE>


                           (ii) as provided in Section  4.2(b);  provided,  that
Chartwell shall have given Trenwick  forty-eight  (48) hours advance notice
of any termination  pursuant to this Section 7.1(c)(ii) and that Chartwell shall
have paid Trenwick the Termination Fee required to be paid by Chartwell pursuant
to Section 5.14(b) hereof. Chartwell agrees to notify Trenwick promptly if it is
no longer prepared to accept the Chartwell  Superior Proposal referred to in its
notification under Section 4.2(b); or

                           (iii) if  Chartwell  fails  to  obtain  the  required
approval of its  stockholders  at the  Chartwell  Stockholders  Meeting and
Chartwell  shall have paid Trenwick any  Termination  Fee required to be paid by
Chartwell pursuant to Section 5.14(b) hereof;

                  (d)      By the Board of Directors of Trenwick:

                  (i) if Chartwell (x) breaches or fails in any material respect
to perform or comply with any of its material covenants and agreements contained
herein or (y) breaches its representations or warranties in any material respect
and such  breach  would  have or would be  reasonably  likely to have a Material
Adverse Effect on Chartwell and its  subsidiaries,  in each case,  such that the
condition  set  forth in  Section  6.2(a)  or  6.2(b)  would  not be  satisfied;
provided,  however,  that if such  breach is curable by  Chartwell  through  the
exercise of  Chartwell's  best efforts and for so long as Chartwell  shall be so
using its best efforts to cure such  breach,  Trenwick  may not  terminate  this
agreement pursuant to this Section 7.1(d)(i); or

                  (ii)  if the  Board  of  Directors  of  Chartwell  shall  have
withdrawn  or  modified  or  changed  its  approval  or  recommendation  of this
Agreement or the Merger in a manner  adverse to Trenwick or shall have  approved
or recommended a Chartwell Takeover Proposal,  (including, without limitation, a
Chartwell  Superior  Proposal) or Chartwell shall have entered into an agreement
in principle  (or similar  agreement) or  definitive  agreement  providing for a
Chartwell  Takeover  Proposal with a person or entity other than Trenwick or any
of its subsidiaries  (or the Board of Directors of Chartwell  resolves to do any
of the foregoing); or

                  (iii) if the  stockholders  of  Chartwell  do not  approve the
Merger at the Chartwell Stockholders Meeting.

          SECTION 7.2.   Effect of Termination.

                  (a) In the event of  termination  of this  Agreement by either
Chartwell or Trenwick as provided in Section 7.1,  written  notice thereof shall
promptly be given to the other party,  and this Agreement shall forthwith become
void and there  shall be no  liability  or  obligation  on the part of any party
hereto  (or of any of its  directors,  officers,  employees,  agents,  legal and
financial  advisors or other  representatives)  other than the  liabilities  and
obligations  provided for in Sections  3.1(s) and 3.2(p),  the last  sentence of
Section 5.3, Section 5.14, this Section 7.2 and Article VIII.  Nothing contained
in this section shall relieve any party from any  liability  resulting  from any
willful and material breach of any of its representations, warranties, covenants
or agreements set forth in this Agreement.

                                       61

<PAGE>

          SECTION 7.3.   Amendment. Subject to the applicable provisions of the
DGCL, this Agreement may be amended,  modified and  supplemented in any and
all respects  whether before or after the Trenwick  Stockholder  Approval or the
Chartwell  Stockholder  Approval only by written agreement signed by the parties
hereto,  pursuant to action taken by respective Boards of Directors with respect
to any of the terms contained  herein;  provided,  however,  that after any such
stockholder  approval,  there shall not be any  amendment  that by law  requires
further  approval  by the  stockholders  of Trenwick  or  Chartwell  without the
further approval of such stockholders.

          SECTION 7.4.   Extension;  Waiver. At any time prior to the Effective
Time, the parties may (a) extend the time for the performance of any of the
obligations or other acts of the other parties,  (b) waive any  inaccuracies  in
the  representations  and  warranties  of the other  parties  contained  in this
Agreement or in any document delivered pursuant to this Agreement or (c) subject
to Section 7.3,  waive  compliance by the other party with any of the agreements
or conditions of the other party contained in this  Agreement.  Any agreement on
the part of a party to any such  extension  or waiver shall be valid only if set
forth in an instrument in writing signed on behalf of such party. The failure of
any party to this  Agreement to assert any of its rights under this Agreement or
otherwise shall not constitute a waiver of such rights.

          SECTION 7.5.   Procedure for  Termination,  Amendment,  Extension or
Waiver.  A  termination  of this  Agreement  pursuant  to Section  7.1,  an
amendment  of this  Agreement  pursuant to Section 7.3 or an extension or waiver
pursuant to Section 7.4 shall, in order to be effective,  require in the case of
Trenwick or Chartwell,  action by its Board of Directors or, with respect to any
amendment  to this  Agreement,  the duly  authorized  designee  of its  Board of
Directors.

                                  ARTICLE VIII

                               GENERAL PROVISIONS

          SECTION  8.1.  Nonsurvival of  Representations  and  Warranties.  None
of the representations and warranties in this Agreement or in any schedule,
instrument or other document  delivered pursuant to this Agreement shall survive
the Effective  Time.  This Section 8.1 shall not limit any covenant or agreement
of the parties which by its terms  contemplates  performance after the Effective
Time including but not limited to Sections 5.5 and 5.6.
SECTION 8.2.  ..Definitions.  For purposes of this Agreement:

                  (a)  an  "affiliate"  of  or a  person  "affiliated"  with,  a
specified  person,  means a person that directly or  indirectly,  through one or
more  intermediaries,  controls,  is controlled  by, or is under common  control
with, the person specified;

                  (b) "control"  (including  "controlling,"  "controlled by" and
"under common control with") means the  possession,  direct or indirect,  of the
power to direct or cause the  direction  of the  management  and  policies  of a
person,  whether  through the  ownership  of voting  securities,  by contract or
otherwise.

                                       62

<PAGE>

                  (c)  "person"  means  any  individual,   corporation,  estate,
partnership, limited liability company, joint venture, association,  joint-stock
company,  trust,  unincorporated  organization  or  government  or an  agency or
political subdivision thereof or other entity;

                  (d) a "subsidiary"  means with respect to any person,  (i) any
corporation  at least a  majority  of the  outstanding  voting  stock (or equity
interest  if  no  voting  interest  exists)  of  which  is  owned,  directly  or
indirectly,  by such  person or by one or more of its  subsidiaries,  or by such
person and one or more of its subsidiaries,  (ii) any general partnership, joint
venture or similar entity, at least a majority of whose outstanding  partnership
or similar  interests  shall at the time be owned by such  person,  or by one or
more of its subsidiaries, or by such person and one or more of its subsidiaries,
(iii) any limited partnership of which such person or any of its subsidiaries is
a general partner and (iv) any statutory business trust formed under the laws of
the State of Delaware all of the  beneficial  interests  (represented  by common
securities)  of which shall be owned by such  person.  For the  purposes of this
definition,  "voting  stock" means shares,  interests,  participations  or other
equivalents in the equity  interest  (however  designated) in such person having
ordinary  voting power for the election of a majority of the  directors  (or the
equivalent)  of such person,  other than shares,  interests,  participations  or
other  equivalents  having  such  power  only by reason of the  occurrence  of a
contingency; and

                  (e) "knowledge" of any person which is not an individual means
the knowledge of such person's executive officers after reasonable inquiry.

                  (f) "Environmental Law" means the Comprehensive  Environmental
Response,  Compensation, and Liability Act, the Water Pollution Control Act, the
Safe  Drinking  Water Act,  the Clean Water Act, the Clean Air Act, the Resource
Conservation and Recovery Act, the Hazardous  Materials  Transportation Act, the
Solid Waste Disposal Act, the Federal Toxic Substances  Control Act, the Federal
Insecticide,  Fungicide and  Rodenticide  Act, and analogous state acts, and all
other statutes, rules and regulations relating to pollution or protection of the
environment, each as amended and implemented as of the date of this Agreement.

                  (g)  "Hazardous   Material"  means  (i)  hazardous  materials,
hazardous  substances,  extremely  hazardous  substances or hazardous wastes, as
those  terms are  defined in  applicable  Environmental  Laws;  (ii)  petroleum,
including, without limitation, crude oil or any fraction thereof which is liquid
at standard  conditions of temperature  and pressure (60 degrees  Fahrenheit and
14.7 pounds per square inch absolute);  (iii) asbestos in any form or condition;
and (iv) any other material,  substance or waste to which liability or standards
of conduct may be imposed under any applicable Environmental Law.

                  (h) "Material  Adverse  Change" or "Material  Adverse  Effect"
means, when used in connection with Trenwick or Chartwell,  any change,  effect,
event, occurrence or state of facts that is or will be materially adverse to the
business,  results of  operations  or financial  condition of such party and its
subsidiaries taken as a whole other than any change,  effect, event,  occurrence
or state of facts  relating  to (i) the  United  States  or  global  economy  or
securities  markets  in  general,   (ii)  this  Agreement  or  the  transactions
contemplated hereby (including with respect to Chartwell, the items set forth in
Section  8.2(h) of the  Chartwell  Disclosure  Schedule  and,  with  respect  to
Trenwick,  the items  set forth in  Section  8.2(h) of the  Trenwick  Disclosure
Schedule),  or the announcement  thereof,  (iii) any segment of the property and
casualty  insurance or  reinsurance  industry in which such person or any of its
subsidiaries  participates in general, and not specifically relating to Trenwick
or Chartwell or their respective subsidiaries, (iv) any decrease in the value of
portfolio  investments  resulting from an increase in prevailing market interest
rates  or  (v)  any  losses  under  insurance,   reinsurance  or  retrocessional
agreements  (other  than where a  subsidiary  of  Chartwell  or  Trenwick is the
cedent) in respect of any event that is designated to be a "catastrophe"  by the
Property Claims Services Division of the American Insurance Services Group, Inc.
after the date hereof.

                                       63

<PAGE>


          SECTION  8.3.  Notices.  All  notices,  requests, claims, demands  and
other  communications under this Agreement shall be in writing and shall be
deemed given if delivered personally,  sent by facsimile (which is confirmed) or
sent by overnight  courier  (providing  proof of delivery) to the parties at the
following  addresses (or at such other address for a party as shall be specified
by like notice):

           (a)  if to Trenwick, to

                Alan L. Hunte
                Vice President and Chief Financial Officer
                Trenwick Group Inc.
                One Canterbury Green
                Stamford, CT 06901
                Fax:  (203) 353-5557

                with a copy to:

                Baker & McKenzie
                805 Third Avenue
                New York, NY  10022
                Attention: James R. Cameron
                Fax:  (212) 891-3835

           (b)  if to Chartwell, to

                President
                Chartwell Re Corporation
                Four Stamford Plaza
                107 Elm Street
                Stamford CT 06902
                Fax: (203) 705-2710

                with a copy to:

                LeBoeuf, Lamb, Greene & MacRae, L.L.P.
                125 West 55th Street
                New York, NY 10019
                Attention: Robert S. Rachofsky
                Fax:  (212) 424-8500

                                       64

<PAGE>

          SECTION 8.4.   Interpretation.  When  a  reference  is  made  in this
Agreement to  an  Article,  Section, Exhibit or Schedule, such  reference  shall
be to an Article or Section  of, or an Exhibit or Schedule  to,  this  Agreement
unless otherwise indicated. The table of contents and headings contained in this
Agreement  are for  reference  purposes only and shall not affect in any way the
meaning or  interpretation  of this  Agreement.  Whenever  the words  "include,"
"includes" or "including" are used in this Agreement, they shall be deemed to be
followed by the words "without  limitation." The phrase "made available" in this
Agreement shall mean that the information referred to has been made available if
requested by the party to whom such  information  is to be made  available.  The
words  "hereof",  "herein" and "hereunder" and words or similar import when used
in this  Agreement  shall  refer  to this  Agreement  as a whole  and not to any
particular  provision of this  Agreement.  All terms  defined in this  Agreement
shall have the defined  meanings when used in any  certificate or other document
made  or  delivered  pursuant  hereto  unless  otherwise  defined  therein.  The
definitions  contained in this  Agreement are applicable to the singular as well
as the  plural  forms  of  such  terms  and to the  masculine  as well as to the
feminine and neuter genders of such term.  Any agreement,  instrument or statute
defined or referred to herein or in any agreement or instrument that is referred
to herein  means  such  agreement,  instrument  or  statute as from time to time
amended,  modified or  supplemented,  including  (in the case of  agreements  or
instruments) by wavier or consent and (in the case of statutes) by succession of
comparable successor statutes.  References to a person are also to its permitted
successors and assigns.

          SECTION  8.5.  Counterparts.  This Agreement  may  be  executed in one
or more  counterparts,  each of which shall  be an original  and  all  of  which
shall be considered one and the same  agreement and shall become  effective when
one or more  counterparts  have been signed by each of the parties and delivered
to the other party.

          SECTION   8.6.   Entire  Agreement;   No Other  Representations;   No
Third-Party   Beneficiaries.  This  Agreement  (including  any   exhibits  and
schedules  hereto),   the  Stock  Option  Agreement,   and  the  Confidentiality
Agreements constitute the entire agreement,  and supersede all prior agreements,
understandings, representations and warranties, both written and oral, among the
parties  with  respect  to  the  subject  matter  of  this  Agreement.  Trenwick
acknowledges  that neither  Chartwell  nor any  affiliate or officer,  director,
employee,  representative  or  advisor  of any of them  makes  or has  made  any
representation  or  warranty,   express  or  implied,   to  Trenwick  except  as
specifically  made in this  Agreement or in any  certificate  or other  document
delivered  pursuant  hereto.  This  Agreement is not intended to confer upon any
person other than the parties hereto, any rights or remedies except as set forth
in Section 5.6(c).

                                       65

<PAGE>

          SECTION 8.7.   Governing Law. This Agreement shall be governed by, and
construed in accordance  with,  the laws of the State of Delaware,  without
regard to conflicts of laws principles thereof.

          SECTION  8.8.  Assignment.  Neither this  Agreement  nor any of the
rights, interests or obligations under this Agreement shall be assigned, in
whole or in part,  by  operation  of law or  otherwise  by either of the parties
hereto without the prior written  consent of the other party.  Any assignment in
violation of the preceding  sentence shall be void. Subject to the preceding two
sentences,  this Agreement will be binding upon, inure to the benefit of, and be
enforceable by, the parties and their respective successors and assigns.

          SECTION 8.9.   Enforcement and Consent to Jurisdiction.  The parties
agree that  irreparable  damage would occur and that the parties  would not
have any adequate  remedy at law in the event that any of the provisions of this
Agreement  were not performed in accordance  with their  specific  terms or were
otherwise breached.  It is accordingly agreed that the parties shall be entitled
to an injunction or  injunctions  to prevent  breaches of this  Agreement in any
court of the United States located in the State of Delaware or in Delaware state
court (any such federal or state court, a "Delaware Court"),  in addition to any
other remedy to which they are entitled at law or in equity.  In addition,  each
of the parties hereto (a) consents to submit itself to the personal jurisdiction
of any Delaware  Court in the event any dispute  arises out of this Agreement or
any of the  transactions  contemplated  by this Agreement and (b) agrees that it
will not attempt to deny or defeat such personal jurisdiction or venue by motion
or other request for leave from any such Delaware Court,  and (c) agrees that it
will not bring any action relating to this Agreement or any of the  transactions
contemplated by this Agreement in any court other than any Delaware Court.

          SECTION 8.10.  Severability.  If any term, provision, covenant or
restriction of this Agreement is held by a court of competent  jurisdiction
or other authority to be invalid, void,  unenforceable or against its regulatory
or  public  policy,  the  remainder  of the  terms,  provisions,  covenants  and
restrictions  of this Agreement  shall remain in full force and effect and shall
in no way be affected, impaired or invalidated.  Upon any determination that any
term,  provision,  covenant or restriction is invalid,  void,  unenforceable  or
against its regulatory or public policy,  the parties hereto shall  negotiate in
good faith to modify this  Agreement so as to effect the original  intent of the
parties as closely as possible to the fullest extent permitted by applicable law
in an acceptable manner to the end that the transactions contemplated hereby are
fulfilled to the extent possible.

                                       66
<PAGE>


      IN WITNESS  WHEREOF,  the parties  hereto have caused this Agreement to be
signed by their respective  officers  thereunto duly  authorized,  all as of the
date first written above.

                                             TRENWICK GROUP INC.

                                             By:    /s/ James F. Billett, Jr.
                                             ----------------------------------
                                             Name:  James F. Billett, Jr.
                                             Title: Chairman, President and
                                                    Chief Executive Officer


                                             CHARTWELL RE CORPORATION

                                             By:    /s/ Richard E. Cole
                                             -----------------------------------
                                             Name:  Richard E. Cole
                                             Title: Chairman and Chief
                                                    Executive Officer



<PAGE>


                                                               EXHIBIT 6.2(g)






                                                           _____________, 1999


Trenwick Group Inc.
One Canterbury Green
Stamford, CT  06901

                  Re:      Chartwell

Dear Sirs:

                  We have acted as special  counsel to Chartwell Re  Corporation
("Chartwell")  in connection with the execution and delivery by Chartwell of the
Agreement  and  Plan  of  Merger,  dated  as  of  June  21,  1999  (the  "Merger
Agreement"), between Chartwell and Trenwick Group Inc. ("Trenwick"), pursuant to
which  Chartwell shall be merged with and into Trenwick on the terms and subject
to the conditions set forth in the Merger Agreement (the "Merger"). This opinion
is being rendered to you pursuant to Section 6.2(g) of the Merger Agreement.

                  For purpose of  rendering  this  opinion we have  examined and
relied upon the  following:  (i) the Merger  Agreement;  and (ii) the Indenture,
dated as of December 1, 1995,  between  Chartwell,  as the successor to Piedmont
Management Company Inc. and Fleet National Bank of Connecticut,  as Trustee, for
the  Contingent  Interest  Notes due June 30, 2006,  and the First  Supplemental
Indenture  thereto,  dated as of December 13, 1995,  among  Piedmont  Management
Company Inc.,  Chartwell and Fleet National Bank of Connecticut,  as Trustee (as
so  supplemented,   the  "Indenture").  In  addition,  as  special  counsel  for
Chartwell,  we  have  examined  originals  (or  copies  certified  or  otherwise
identified to our satisfaction) of such instruments,  certificates and documents
and  have  reviewed  such  questions  of  law as we  have  deemed  necessary  or
appropriate  for the  purposes  of this  opinion.  In such  examination  we have
assumed the  genuineness of all  signatures,  the  authenticity of all documents
submitted to us as originals and the conformity to authentic  original documents
of all  documents  submitted  to us as copies.  As to any facts  material to our
opinion, we have, when relevant facts were not independently  established by us,
relied upon the aforesaid instruments, certificates and documents.

                  In addition, in rendering this opinion, we have assumed that:

                  (i) as a result of the Merger,  no "person" or "group" (within
the meaning of Rule 13d-5 under the Securities  Exchange Act of 1934, as amended
(the  "Exchange  Act") and Sections  13(d) and 14(d) of the  Exchange  Act) will
become the direct or indirect "beneficial owner" (as defined in Rule 13d-3 under
the Exchange  Act), of greater than 50% of the total voting power (as defined in
the  definition  of  "Change  of  Control"  set  forth in  Section  1.1.  of the
Indenture) entitled to vote in the election of directors of Trenwick; and

                  (ii) prior to the time that the Common  Stock,  par value $.01
per share,  of  Chartwell  ceases to be listed on the New York  Stock  Exchange,
Trenwick  will  have  executed  and  delivered  to the  Trustee  a  supplemental
indenture and succeeded to the rights, powers and obligations of Chartwell under
the Indenture pursuant to and in accordance with Article 5 thereof.

                  Based on the  foregoing,  and  subject  to the  qualifications
stated herein,  we are of the opinion that the  consummation  of the Merger will
not constitute a "Change of Control" as defined in Section 1.1 of the Indenture.

                  We express no opinion  with respect to any laws other than the
laws of the State of New York. This opinion is delivered  solely to you pursuant
to the Merger  Agreement,  and it may not be  delivered to or relied upon in any
manner  by  any  other  person  or  entity,  or in  connection  with  any  other
transaction or matter, without our express prior written consent.

                                            Very truly yours,







                             STOCK OPTION AGREEMENT

                  STOCK  OPTION  AGREEMENT,  dated  as of  June  21,  1999  (the
"Agreement")  by  and  between  Trenwick  Group  Inc.,  a  Delaware  corporation
("Trenwick"),  and Chartwell Re Corporation, a Delaware corporation ("Chartwell"
or the "Issuer").

                  WHEREAS,  concurrently with the execution and delivery of this
Agreement,  Trenwick and  Chartwell  are entering  into an Agreement and Plan of
Merger,  dated as of the date hereof (the "Merger  Agreement"),  which provides,
among other things,  upon the terms and subject to the conditions  thereof,  for
the merger of Chartwell with and into  Trenwick,  with Trenwick as the surviving
corporation (the "Merger"); and

                  WHEREAS,  as a condition to  Trenwick's  willingness  to enter
into the Merger  Agreement,  Trenwick has requested  that Chartwell  agree,  and
Chartwell  has so  agreed,  to grant to  Trenwick  an option to  purchase  up to
1,918,729  shares of  common  stock,  par value  $.01 per  share,  of  Chartwell
("Chartwell  Common  Stock")  in  accordance  with the terms and  subject to the
conditions set forth herein.

                  NOW,  THEREFORE,  to induce  Trenwick to enter into the Merger
Agreement, and in consideration of the foregoing and the mutual representations,
warranties,  covenants  and  agreements  set  forth  herein  and in  the  Merger
Agreement, the parties hereto agree as follows:

               1.  Grant of  Option.  Subject  to the terms and  conditions set
forth herein,  Chartwell  hereby grants to Trenwick an  irrevocable  option
(the  "Chartwell  Option") to purchase up to 1,918,729 (as adjusted as set forth
herein) shares (the "Option  Shares") of Chartwell  Common Stock (such number of
Option  Shares  representing  19.9% of the number of shares of Chartwell  Common
Stock issued and  outstanding  on the date hereof) in the manner set forth below
at a price (the  "Exercise  Price") of $23.82 per Option  Share (which price per
share is equal to the product of the Conversion Number (as defined in the Merger
Agreement) and the closing price per share of Trenwick  common stock,  par value
$.01 per share,  on the Nasdaq Stock Market National Market on the date hereof),
payable  in cash in  accordance  with  Section  4  hereof.  Notwithstanding  the
foregoing, in no event shall the number of Option Shares for which the Chartwell
Option is  exercisable  exceed  19.9% of the  number of issued  and  outstanding
shares of Chartwell Common Stock.  Capitalized terms used herein but not defined
herein shall have the meanings set forth in the Merger Agreement.

                2.  Exercise of Option. The Chartwell Option may be exercised by
Trenwick,  in whole or in part,  at any time or from time to time after the
Merger Agreement becomes terminable by Trenwick under  circumstances which would
or could  entitle  Trenwick to receive the  Termination  Fee pursuant to Section
5.14(b) of the Merger Agreement (a "Trigger  Event")  (regardless of whether the
Merger  Agreement  is  actually  terminated  or whether  there  occurs a closing
involving  Chartwell);  provided,  that a Trigger  Event  shall not occur in the
circumstances  contemplated by Section 5.14(b)(z) of the Merger Agreement unless
and until a Termination Fee shall be payable  pursuant to Section  5.14(b)(z) of
the Merger  Agreement.  In the  event Trenwick  wishes to exercise the Chartwell


<PAGE>

Option,  Trenwick  shall  deliver to  Chartwell a written  notice (an  "Exercise
Notice")  specifying  the total  number of Option  Shares it wishes to purchase.
Each closing of a purchase of Option Shares (an "Option  Closing")  shall occur,
but subject to the satisfaction or waiver of the conditions set forth in Section
3 hereof,  at a place,  on a date and at a time  designated  by  Trenwick  in an
Exercise  Notice  delivered at least two business  days prior to the date of the
Option  Closing.  The Chartwell  Option shall terminate upon the earlier of: (i)
the Effective  Time;  (ii) the  termination of the Merger  Agreement  other than
under  circumstances  which also  constitute a Trigger Event; or (iii) the 180th
day following a Trigger  Event (or if, at the  expiration of such 180 day period
the Chartwell  Option cannot be exercised by reason of any applicable  judgment,
decree,  order,  law or  regulation,  10 business days after such  impediment to
exercise  shall have been  removed or shall have become final and not subject to
appeal,  but in no event  under  this  clause  (iii)  later  than the  365th day
following such Trigger  Event).  Notwithstanding  the  foregoing,  the Chartwell
Option may not be  exercised  if Trenwick  is in  material  breach of any of its
representations or warranties,  or in material breach of any of its covenants or
agreements,  contained in this  Agreement or in the Merger  Agreement.  Upon the
giving by Trenwick to  Chartwell  of the  Exercise  Notice and the tender of the
applicable  aggregate  Exercise Price, but subject to the satisfaction or waiver
of the conditions set forth in Section 3 hereof,  Trenwick shall be deemed to be
the  holder  of  record  of the  Option  Shares  issuable  upon  such  exercise,
notwithstanding  that the stock transfer books of Chartwell shall then be closed
or that certificates  representing such Option Shares shall not then be actually
delivered to Trenwick.

                3. Conditions to Closing. The obligation of Chartwell to issue
the Option Shares to Trenwick hereunder is subject to the conditions, which
(other than the  conditions  described in clauses (i), (iii) and (iv) below) may
be waived by Chartwell in its sole discretion,  that (i) all waiting periods, if
any,  under  the HSR  Act,  applicable  to the  issuance  of the  Option  Shares
hereunder  shall have expired or have been  terminated;  (ii) the Option  Shares
shall  have  been  approved  for  listing  on the NYSE upon  official  notice of
issuance;  (iii)  all  consents,  approvals,  orders  or  authorizations  of, or
registrations,  declarations  or  filings  with,  any  federal,  state  or local
administrative   agency  or  commission  or  other   federal,   state  or  local
Governmental  Entity,  if any,  required in connection  with the issuance of the
Option  Shares  hereunder  shall have been  obtained or made, as the case may be
including, without limitation, by Trenwick; and (iv) no preliminary or permanent
injunction or other order or decree by any court of competent jurisdiction,  law
or regulation  prohibiting  or otherwise  restraining  such issuance shall be in
effect.

               4.       Payment and Delivery of Certificates.

               (a) At any  Option  Closing,  Trenwick  shall  pay to  Chartwell
the aggregate purchase price (equal to the Exercise Price multiplied by the
number of Option  Shares to be purchased at such Option  Closing) for the shares
of Chartwell  Common Stock  purchased  pursuant to the exercise of the Chartwell
Option  in  immediately  available  funds  by wire  transfer  to a bank  account
designated in writing by Chartwell;  provided,  however, that failure or refusal
of  Chartwell  to  designate  such  account  shall not  preclude  Trenwick  from
exercising the Chartwell Option.

                                       -2-
<PAGE>


               (b) At any Option  Closing,  simultaneously  with the  delivery
of immediately  available funds as provided in Section 4(a), Chartwell will
deliver to Trenwick a certificate  or  certificates  representing  the number of
Option Shares to be purchased by Trenwick at such Option  Closing,  which Option
Shares will be free and clear of all liens, claims,  charges and encumbrances of
any kind whatsoever and if the option is exercised in part only, Chartwell shall
deliver a new option  evidencing the rights of Trenwick  thereof to purchase the
balance of the shares  purchasable  hereunder  and (ii) Trenwick will deliver to
Chartwell a copy of this Agreement and a letter  agreeing that Trenwick will not
offer to sell or otherwise dispose of such shares in violation of applicable law
or the provisions of this Agreement. If at the time of issuance of Option Shares
pursuant  to an  exercise  of the  option  hereunder,  Chartwell  shall not have
redeemed the Chartwell Rights, or shall have issued any similar securities, then
each Option Share issued  pursuant to such exercise will also  represent  such a
corresponding Chartwell Right or new rights with terms substantially the same as
and at least as favorable to Trenwick as are  provided in the  Chartwell  Rights
Agreement or similar agreement then in effect. Chartwell shall pay all expenses,
and any and all United States  federal,  state and local taxes and other charges
that may be payable in connection  with the  preparation,  issue and delivery of
stock certificates under this Section 4 in the name of Trenwick or its designee.

               5. Representations and Warranties of Chartwell. Chartwell hereby
represents  and warrants to Trenwick  that (a)  Chartwell is a  corporation
duly  organized,  validly  existing and in good  standing  under the laws of the
State of Delaware and has the  corporate  power and authority to enter into this
Agreement, (b) the execution and delivery of this Agreement by Chartwell and the
consummation by Chartwell of the transactions contemplated hereby have been duly
authorized  by all  necessary  corporate  action on the part of Chartwell and no
other corporate  proceedings on the part of Chartwell are necessary to authorize
this  Agreement  or  any of  the  transactions  contemplated  hereby,  (c)  this
Agreement has been duly executed and delivered by Chartwell, constitutes a valid
and binding  obligation of Chartwell and, assuming this Agreement  constitutes a
valid and binding  obligation of Trenwick,  is enforceable  against Chartwell in
accordance  with its terms,  (d)  Chartwell  has taken all  necessary  corporate
action to authorize  and reserve for  issuance  and to permit it to issue,  upon
exercise of the Chartwell Option,  and at all times from the date hereof through
the expiration of the Chartwell Option will have reserved,  1,918,729 authorized
and unissued Option Shares,  such amount being subject to adjustment as provided
in Section 9, all of which,  upon their issuance and delivery in accordance with
the  terms  of  this  Agreement,   will  be  validly  issued,   fully  paid  and
nonassessable,  (e) upon  delivery  of the Option  Shares to  Trenwick  upon the
exercise of the Chartwell  Option,  Trenwick will acquire the Option Shares free
and clear of all claims, liens, charges,  encumbrances and security interests of
any nature  whatsoever,  and (f) none of  Chartwell,  any of its  affiliates  or
anyone acting on its or their behalf has issued, sold or offered any security of
Chartwell  to any person under  circumstances  that would cause the issuance and
sale of the Option Shares,  as contemplated by this Agreement,  to be subject to
the  registration  requirements  of the  Securities Act as in effect on the date
hereof and, assuming the  representations  of Trenwick contained in Section 6(d)
are true and correct and based on Trenwick's  commitment in its letter  referred
to in Section 4 hereof,  the  issuance,  sale and delivery of the Option  Shares
hereunder  would  be  exempt  from  the  registration  and  prospectus  delivery
requirements  of the  Securities  Act,  as in  effect  on the date  hereof  (and
Chartwell  shall not take any action  which would cause the  issuance,  sale and
delivery  of  the  Option   Shares   hereunder   not  to  be  exempt  from  such
requirements).

                                       -3-
<PAGE>

               6.   Representations and Warranties of Trenwick.  Trenwick
represents  and  warrants to Chartwell  that (a) Trenwick is a  corporation
duly  organized,  validly  existing and in good  standing  under the laws of the
State of Delaware and has the  corporate  power and authority to enter into this
Agreement  and to carry out its  obligations  hereunder,  (b) the  execution and
delivery of this Agreement by Trenwick and the  consummation  by Trenwick of the
transactions  contemplated  hereby have been duly  authorized  by all  necessary
corporate  action on the part of Trenwick and no other corporate  proceedings on
the part of Trenwick are  necessary to  authorize  this  Agreement or any of the
transactions  contemplated hereby, (c) this Agreement has been duly executed and
delivered  by  Trenwick  and  constitutes  a valid  and  binding  obligation  of
Trenwick,   and,  assuming  this  Agreement  constitutes  a  valid  and  binding
obligation of Chartwell,  is enforceable against Trenwick in accordance with its
terms,  and (d) any Option Shares acquired upon exercise of the Chartwell Option
will be acquired for  Trenwick's own account,  for investment  purposes only and
will not be, and the Chartwell Option is not being,  acquired by Trenwick with a
view to the public distribution thereof in violation of any applicable provision
of the Securities Act.

               7.   Restrictions on Transfer.

               (a)  Restrictions  on Transfer.  Prior to the first  anniversary
of the date on which  Trenwick  purchases any Option Shares  hereunder (the
"Expiration Date"), Trenwick shall not, directly or indirectly,  by operation of
law or otherwise,  sell, assign, pledge, or otherwise dispose of or transfer any
Option  Shares  acquired by Trenwick  pursuant  to this  Agreement  ("Restricted
Shares") beneficially owned by it, other than in accordance with Section 7(b) or
Section 8. Subsequent to the Expiration  Date,  Trenwick shall not,  directly or
indirectly, by operation of law or otherwise,  sell, assign, pledge or otherwise
dispose of or transfer any  Restricted  Shares  beneficially  owned by it to any
purchaser,  assignee,  pledgee or other transferee who would,  immediately after
such sale, assignment,  pledge,  disposition or transfer,  beneficially own more
than 4.9% of the then  outstanding  voting power of the issuer of the Restricted
Shares,  except in  accordance  with Section 7(b) or Section 8 and other than in
market transactions at prevailing prices.

               (b) Permitted Sales. Following the termination of the Merger
Agreement,  Trenwick  shall be permitted to sell or transfer any Restricted
Shares  beneficially  owned by it if such sale is made  pursuant  to a tender or
exchange  offer or merger that has been  approved or  recommended,  or otherwise
determined  to be fair  to and in the  best  interests  of the  shareholders  of
Chartwell,  by a majority of the members of the Board of  Directors of Chartwell
(which  majority shall include a majority of directors who were directors  prior
to the announcement of such tender or exchange offer or merger).

                                       -4-
<PAGE>

               8.  Registration Rights.  Following the termination of the Merger
Agreement,  but not later than the second anniversary of the last date that
Trenwick  acquired Option Shares under this  Agreement,  Trenwick (a "Designated
Holder") may by written  notice (the  "Registration  Notice") to Chartwell  (the
"Registrant") request the Registrant to register under the Securities Act all or
any part of the Restricted  Shares  beneficially  owned by the Designated Holder
(the  "Registrable   Securities")  pursuant  to  a  bona  fide  firm  commitment
underwritten public offering in which the Designated Holder and the underwriters
shall  effect  as wide a  distribution  of  such  Registrable  Securities  as is
reasonably  practicable and shall use their  commercially  reasonable efforts to
prevent  any  person  (including  any  Group  (as used in Rule  13d-5  under the
Exchange  Act))  and  its  affiliates  from  purchasing  through  such  offering
Restricted Shares  representing more than 1% of the outstanding shares of common
stock of the Registrant on a fully diluted basis (a "Permitted  Offering").  The
Registration  Notice  shall  include a  certificate  executed by the  Designated
Holder and its proposed  managing  underwriter,  which  underwriter  shall be an
investment  banking firm of  nationally  recognized  standing  (the  "Manager"),
stating  that (i) they  have a good  faith  intention  to  commence  promptly  a
Permitted  Offering and (ii) the Manager in good faith believes  that,  based on
the then prevailing market  conditions,  it will be able to sell the Registrable
Securities  at a per share  price  equal to at least 80% of the then Fair Market
Value (as  defined  below) of such  shares.  The  Registrant  (and/or any person
designated by the  Registrant)  shall  thereupon have the option  exercisable by
written notice delivered to the Designated  Holder within 10 business days after
the receipt of the Registration Notice,  irrevocably to agree to purchase all or
any  part of the  Registrable  Securities  proposed  to be so sold for cash at a
price (the "Option Price") equal to the product of (i) the number of Registrable
Securities  to be so purchased by the  Registrant  and (ii) the then Fair Market
Value of such  shares.  Any  such  purchase  of  Registrable  Securities  by the
Registrant (or its designee)  hereunder shall take place at a closing to be held
at the principal  executive  offices of the  Registrant or at the offices of its
counsel at any reasonable date and time designated by the Registrant and/or such
designee in such notice within 20 business  days after  delivery of such notice.
Any payment for the shares to be purchased shall be made by delivery at the time
of such  closing of the Option Price in  immediately  available  funds.  As used
herein,  the "Fair Market  Value" of any share shall be the average of the daily
closing  sales price for such share on the NYSE during the 10 NYSE  trading days
prior to the fifth NYSE trading day preceding the date such Fair Market Value is
to be determined.
                  If the  Registrant  does not  elect  to  exercise  its  option
pursuant to this Section 8 with respect to all Registrable Securities,  it shall
use its commercially  reasonable  efforts to effect, as promptly as practicable,
the  registration  under  the  Securities  Act  of the  unpurchased  Registrable
Securities proposed to be so sold;  provided,  however,  that (i) Trenwick shall
not be  entitled  to  more  than  an  aggregate  of two  effective  registration
statements  hereunder and (ii) the  Registrant  will not be required to file any
such  registration  statement  during  any period of time (not to exceed 90 days
after such  request in the case of clauses  (A),  (B) or (C) below) when (A) the
Registrant  is  in  possession  of  material  non-public  information  which  it
reasonably  believes  would be  detrimental to be disclosed at such time and, in
the  opinion of counsel to the  Registrant,  such  information  would have to be
disclosed  if a  registration  statement  were  filed  at  that  time;  (B)  the
Registrant is required  under the Securities  Act to include  audited  financial
statements  for any period in such  registration  statement  and such  financial
statements are not yet available for inclusion in such  registration  statement;
or  (C)  the  Registrant  determines,  in its  reasonable  judgment,  that  such
registration  would interfere with any financing,  acquisition or other material
transaction  involving the Registrant or any of its  affiliates.  The Registrant
shall  use its  reasonable  best  efforts  to cause any  Registrable  Securities
registered  pursuant  to this  Section  8 to be  qualified  for sale  under  the
securities or blue sky laws of such  jurisdictions as the Designated  Holder may
reasonably  request and shall continue such  registration  or  qualification  in
effect in such jurisdiction; provided, however, that the Registrant shall not be
required to qualify to do business in, or consent to general  service of process
in, any jurisdiction by reason of this provision.

                                       -5-
<PAGE>


                  The  registration  rights  set  forth  in this  Section  8 are
subject to the condition that the Designated Holder shall provide the Registrant
with such information with respect to such holder's Registrable Securities,  the
plans for the distribution  thereof,  and such other information with respect to
such holder as, in the  reasonable  judgment of counsel for the  Registrant,  is
necessary to enable the Registrant to include in such registration statement all
material  facts  required  to  be  disclosed  with  respect  to  a  registration
thereunder.

                  A registration effected under this Section 8 shall be effected
at the Registrant's expense,  except for underwriting  discounts and commissions
and the fees and the  expenses  of counsel  to the  Designated  Holder,  and the
Registrant  shall  provide to the  underwriters  such  documentation  (including
certificates,  opinions of counsel and "comfort"  letters from  auditors) as are
customary in connection with underwritten  public offerings as such underwriters
may reasonably  require.  In connection with any such registration,  the parties
agree (i) to indemnify each other and the  underwriters in the customary  manner
(provided that the Designated  Holder shall only be required to indemnify  other
parties  to  such  underwriting  agreement  for  information  relating  to  such
Designated  Holder  and  supplied  by it  for  inclusion  in  such  registration
statement),  (ii) to enter into an underwriting  agreement in form and substance
customary  for  transactions  of such  type  with  the  Manager  and  the  other
underwriters  participating  in such  offering  and  (iii) to take  all  further
actions which shall be reasonably necessary to effect such registration and sale
(including,  if the  Manager  deems it  necessary,  participating  in road  show
presentations).

                  The  Registrant  shall be entitled to include (at its expense)
additional  shares of its common stock in a  registration  effected  pursuant to
this  Section  8 only if and to the  extent  the  Manager  determines  that such
inclusion will not adversely affect the prospects for success of such offering.

                 9.  Adjustment  upon  Changes  in  Capitalization.  Without
limitation to any  restriction on Chartwell  contained in this Agreement or
in the Merger Agreement, in the event of any change in Chartwell Common Stock by
reason of stock dividends, split-ups, mergers, recapitalizations,  subdivisions,
conversions,  combinations,  exchange of shares or the like, the type and number
of shares or securities  subject to the Chartwell Option, and the Exercise Price
per Option  Share  provided  in Section 1, shall be  adjusted  appropriately  to
restore to Trenwick its rights  hereunder,  including the right to purchase from
the Chartwell (or its successors)  shares of Chartwell Common Stock representing
19.9% of the outstanding Chartwell Common Stock for the aggregate Exercise Price
calculated as of the date of this Agreement as provided in Section 1.

                                       -6-
<PAGE>

               10.  Restrictive  Legends.  Each  certificate representing shares
of  Chartwell  Common Stock issued to Trenwick at a Closing will have typed
or printed thereon a restrictive legend in substantially the following form:

                           THE SECURITIES  REPRESENTED BY THIS  CERTIFICATE HAVE
         NOT BEEN REGISTERED  UNDER THE SECURITIES ACT OF 1933, AS AMENDED,  AND
         MAY BE REOFFERED OR SOLD ONLY IF SO REGISTERED OR IF AN EXEMPTION  FROM
         SUCH  REGISTRATION  IS AVAILABLE.  SUCH  SECURITIES ARE ALSO SUBJECT TO
         ADDITIONAL  RESTRICTIONS  ON TRANSFER AS SET FORTH IN THE STOCK  OPTION
         AGREEMENT,  DATED AS OF JUNE 21,  1999, A COPY OF WHICH MAY BE OBTAINED
         FROM THE ISSUER UPON REQUEST.

                  It is  understood  and agreed that:  (i) the  reference to the
resale  restrictions  of the Securities Act in the above legend shall be removed
by delivery of substitute  certificate(s)  without such reference if such Option
Shares have been  registered  pursuant to the Securities Act, such Option Shares
have  been  sold in  reliance  on and in  accordance  with  Rule 144  under  the
Securities  Act or Trenwick  has  delivered to Chartwell a copy of a letter from
the staff of the Securities and Exchange  Commission,  or an opinion of counsel,
in form and substance  satisfactory to Chartwell and its counsel,  to the effect
that such legend is not required for purposes of the  Securities  Act;  (ii) the
reference to  restrictions  pursuant to this Agreement in the above legend shall
be removed by delivery of substitute  certificate(s)  without such  reference if
the Option Shares  evidenced by  certificate(s)  containing  such reference have
been sold or transferred in compliance with the provisions of this Agreement and
under  circumstances  that do not require the retention of such  reference;  and
(iii) the legend  shall be  removed in its  entirety  if the  conditions  in the
preceding  clauses  (i)  and  (ii)  are  both  satisfied.   In  addition,   such
certificate(s)  shall  bear  any  other  legend  as  may  be  required  by  law.
Certificates  representing  shares sold in a registered public offering pursuant
to Section 8 shall not be required to bear the legend set forth in this  Section
10.

               11. Profit Limitation.

               (a)  Notwithstanding  any  other  provision  of  this  Agreement
or the Merger  Agreement,  in no event shall  Trenwick's  Total  Profit (as
hereinafter  defined) exceed $9.0 million (such amount, the "Profit Limit") and,
if it would otherwise exceed such amount, Trenwick, at its sole election, shall,
within five  business  days,  either (i) deliver to the Issuer for  cancellation
Option  Shares  (valued,  for  purposes of this Section 11, at their Fair Market
Value on the date of such  delivery),  (ii) pay cash to the  Issuer or refund in
cash any  Termination  Fee  previously  paid to  Trenwick or reduce or waive the
amount of any Termination Fee payable to Trenwick pursuant to Section 5.14(b) of
the Merger  Agreement,  or (iii)  undertake  any  combination  thereof,  so that
Trenwick's  Total  Profit  shall not exceed the Profit  Limit after  taking into
account  the  foregoing  actions.  As used  herein,  "Total  Profit"  means  the
aggregate amount (before taxes) of (i) the amount of Termination Fee received by
Trenwick  pursuant  to  Section  5.14(b)  of the  Merger  Agreement  and any fee
received by Trenwick  pursuant to Section  5.14(c) of the Merger  Agreement  and
(ii) (x) the net cash  amounts  received  by  Trenwick  pursuant  to the sale of
Option  Shares  (or any other  securities  into  which  such  Option  Shares are
converted or exchanged) to any unaffiliated  party, less (y) Trenwick's purchase
price for such Option Shares.

                                       -7-
<PAGE>

               (b)  Notwithstanding  any  other  provision  of  this  Agreement
     or the Merger  Agreement,  the Chartwell  Option may not be exercised for a
number of Option  Shares  that  would,  as of the date of the  Exercise  Notice,
result in a Notional  Total  Profit (as  hereinafter  defined)  of more than the
Profit Limit and, if exercise of the Chartwell Option otherwise would exceed the
Profit Limit,  Trenwick, at its discretion,  may increase the Exercise Price for
that  number  of Option  Shares  set  forth in the  Exercise  Notice so that the
Notional Total Profit shall not exceed the Profit Limit; provided,  that nothing
in this sentence shall restrict any exercise of the Chartwell  Option  permitted
hereby on any  subsequent  date at the  Exercise  Price  set forth in  Section 1
hereof.  As used herein,  the term  "Notional  Total Profit" with respect to any
number of  Option  Shares as to which  Trenwick  may  propose  to  exercise  the
Chartwell  Option  shall be the Total  Profit  determined  as of the date of the
Exercise Notice  assuming that the Chartwell  Option were exercised on such date
for such number of Option Shares and assuming that such Option Shares,  together
with all  other  shares of  Chartwell  Common  Stock  held by  Trenwick  and its
subsidiaries as of such date, were sold for cash at the closing market price for
the Chartwell  Common Stock on the NYSE  Composite Tape at the close of business
on the preceding trading day (less customary brokerage commissions).

               12. Binding Effect; No Assignment; No Third Party Beneficiaries.
This  Agreement  shall be  binding  upon and  inure to the  benefit  of the
parties hereto and their respective  successors and permitted  assigns.  Neither
this  Agreement  nor the rights or the  obligations  of either  party hereto are
assignable, except by operation of law, or with the written consent of the other
party.  Nothing contained in this Agreement,  express or implied, is intended to
confer  upon any person  other  than the  parties  hereto  and their  respective
permitted  assigns any rights or remedies of any nature  whatsoever by reason of
this  Agreement.  Any Restricted  Shares sold by a party in compliance  with the
provisions of Section 8 shall,  upon  consummation  of such sale, be free of the
restrictions  imposed with respect to such shares by this Agreement,  unless and
until such party shall  repurchase or otherwise  become the beneficial  owner of
such  shares,  and any  transferee  of such shares  shall not be entitled to the
registration rights of such party.

               13. Specific Performance. The parties recognize and agree that if
for any reason any of the provisions of this Agreement are not performed in
accordance  with their specific terms or are otherwise  breached,  immediate and
irreparable  harm or injury would be caused for which money damages would not be
an adequate  remedy.  Accordingly,  each party agrees that, in addition to other
remedies,  the other party shall be entitled to an  injunction  restraining  any
violation or threatened  violation of the provisions of this  Agreement.  In the
event that any action  should be brought in equity to enforce the  provisions of
the  Agreement,  neither  party will allege,  and each party  hereby  waives the
defense, that there is adequate remedy at law.

               14. Entire  Agreement.  This  Agreement,  the Merger  Agreement
(including  any exhibits  and  schedules  thereto) and the  Confidentiality
Agreement  constitute  the  entire  agreement,  and  supersede  all other  prior
agreements and  understandings,  both written and oral, between the parties with
respect to the subject matter of this Agreement.

                                       -8-
<PAGE>

               15.  Further  Assurances.  Each party will  execute and deliver
all such further documents and instruments and take all such further action
as may be necessary in order to consummate the transactions contemplated hereby.

               16.  Validity.  The  invalidity  or  unenforceability  of any
provision of this Agreement shall not affect the validity or enforceability
of the other provisions of this Agreement,  which shall remain in full force and
effect. In the event any court or other competent authority holds any provisions
of this Agreement to be null,  void or  unenforceable,  the parties hereto shall
negotiate  in good faith the  execution  and  delivery of an  amendment  to this
Agreement  in  order,  as nearly  as  possible,  to  effectuate,  to the  extent
permitted  by law,  the  intent  of the  parties  hereto  with  respect  to such
provision and the economic effects thereof.  If for any reason any such court or
regulatory  agency determines that Trenwick is not permitted to acquire the full
number of shares of Chartwell  Common Stock provided in Section 1 hereof (as the
same  may be  adjusted),  it is the  express  intention  of  Chartwell  to allow
Trenwick to acquire such lesser number of shares as may be permissible,  without
any amendment or modification  hereof.  Each party agrees that, should any court
or other competent authority hold any provision of this Agreement or part hereof
to be null,  void or  unenforceable,  or  order  any  party  to take any  action
inconsistent  herewith,  or not take any action required herein, the other party
shall not be entitled to specific  performance  of such provision or part hereof
or to any other remedy,  including but not limited to money damages,  for breach
hereof or of any other  provision of this Agreement or part hereof as the result
of such holding or order.

               17. Notices.  All notices,  requests, claims,  demands and other
communications under this Agreement shall be in writing and shall be deemed
given if (i) delivered,  personally,  or (ii) sent by overnight  courier service
(providing proof of delivery), or (iii) telecopied (which is confirmed), or (iv)
five days after being mailed by  registered  or certified  mail (return  receipt
requested) to the parties at the  following  addresses (or at such other address
for a party as shall be specified by like notice):

                  If to Trenwick:

                      Alan L. Hunte
                      Vice President and
                         Chief Financial Officer
                      Trenwick Group Inc.
                      One Canterbury Green
                      Stamford, CT  06901
                      Fax:  (203) 353-5544


                  with a copy to:

                      Baker & Mc Kenzie
                      805 Third Avenue
                      New York, New York 10022
                      Attention:  James R. Cameron
                      Fax:  (212) 891-3835



                                       -9-
<PAGE>

                  If to Chartwell, to:

                      President
                      Chartwell Re Corporation
                      Four Stamford Plaza
                      107 Elm Street
                      Stamford, CT  06902
                      Fax:  (203) 705-2710

                  with a copy to:

                      LeBoeuf, Lamb, Greene & MacRae, L.L.P.
                      125 West 55th Street
                      New York, New York  10019
                      Attention:  Robert S. Rachofsky
                      Fax: (212) 424-8500

               18.  Governing Law;  Choice of Forum.  This Agreement  shall be
governed by, and  construed in  accordance  with,  the laws of the State of
Delaware without regard to the conflicts of law principles thereof.  Each of the
parties hereto (a) consents to submit itself to the personal jurisdiction of any
federal  court  located in the State of Delaware or any Delaware  state court in
the event any dispute  arises out of this  Agreement or any of the  transactions
contemplated by this  Agreement,  (b) agrees that it will not attempt to deny or
defeat such personal  jurisdiction by motion or other request for leave from any
such court and (c) agrees  that it will not bring any  action  relating  to this
Agreement or any of the transactions contemplated by this Agreement in any court
other than a federal court sitting in the state of Delaware or a Delaware  state
court.

               19.  Interpretation.  When a reference  is made in this Agreement
to a Section, such reference shall be to a Section of this Agreement unless
otherwise indicated. Whenever the words "include", "includes" or "including" are
used in this  Agreement,  they  shall be  deemed  to be  followed  by the  words
"without   limitation."  The  descriptive   headings  herein  are  inserted  for
convenience  of  reference  only and are not intended to be part of or to affect
the meaning or interpretation of this Agreement.

               20.  Counterparts. This Agreement may be executed in one or more
counterparts,  each of which shall be deemed to be an original, but both of
which, taken together, shall constitute one and the same instrument.

               21.  Expenses.  Except as otherwise  expressly  provided herein
or in the Merger  Agreement,  all costs and expenses incurred in connection
with the transactions  contemplated by this Agreement shall be paid by the party
incurring such expenses.

                                      -10-
<PAGE>

               22.  Amendment.  This  Agreement may not be amended,  except by
an instrument in writing signed on behalf of each of the parties.

               23.  Extension;  Waiver.  Any  agreement  on the part of a party
to  waive  any  provision  of this  Agreement,  or to  extend  the time for
performance,  will be valid only if set forth in an instrument in writing signed
on behalf of such party.  The failure of any party to this  Agreement  to assert
any of its rights under this Agreement or otherwise will not constitute a waiver
of such rights.

               24.  Loss or  Mutilation.  Upon  receipt by  Chartwell  of
evidence reasonably  satisfactory to it of the loss, theft,  destruction or
mutilation of this Agreement, and (in the case of loss, theft or destruction) of
reasonably satisfactory indemnification,  and upon surrender and cancellation of
this Agreement,  if mutilated,  Chartwell will execute and deliver to Trenwick a
new  Agreement  of like  tenor and date.  Any such new  Agreement  executed  and
delivered will  constitute an additional  contractual  obligation on the part of
Chartwell, whether or not the Agreement so lost, stolen, destroyed, or mutilated
shall at any time be enforceable by anyone.



                                      -11-
<PAGE>



                  IN WITNESS  WHEREOF,  the  parties  hereto  have  caused  this
Agreement to be executed by their respective duly authorized  officers as of the
date first above written.

                                              TRENWICK GROUP INC.

                                              By:    /s/ James F. Billett, Jr.
                                              ----------------------------------
                                              Name:  James F. Billett, Jr.
                                              Title: Chairman, President and
                                                     Chief Executive Officer


                                              CHARTWELL RE CORPORATION

                                              By:    /s/ Richard E. Cole
                                              ----------------------------------
                                              Name:   Richard E. Cole
                                              Title:  Chairman and Chief
                                                      Executive Officer






 Alan L. Hunte, Vice President, Chief Financial Officer and Treasurer,
               Trenwick Group Inc., (NASDAQ National Market: TREN)
                                 (203) 353-5500

            Steven J. Bensinger, President, Chartwell Re Corporation
                 (NYSE: CWL) (203) 705-2520; 011-44-171-369-3000


    TRENWICK GROUP INC. TO ACQUIRE CHARTWELL RE CORPORATION THROUGH A MERGER


     Stamford Connecticut, June 22, 1999 . . .

     Trenwick  Group  Inc.   ("Trenwick")   and  Chartwell  Re  Corporation
     ("Chartwell")  announced today that they have signed a definitive agreement
     for Trenwick to acquire Chartwell.  James F. Billett,  Jr. will continue as
     Chairman, President and Chief Executive Officer of Trenwick, and Richard E.
     Cole,  Chartwell's Chairman and Chief Executive Officer, will join Trenwick
     as  Vice  Chairman  and a  member  of its  Board  of  Directors.  Three  of
     Chartwell's independent directors will be invited to join Trenwick's Board.

     Under the terms of the merger agreement, shareholders of Chartwell will
     receive  0.825  Trenwick  shares  for each  Chartwell  share in a  tax-free
     transaction.  Based on  Trenwick's  closing  price of  $28.88  per share on
     Monday,  June 21, each Chartwell  share would be valued at $23.82,  and the
     total  consideration  for the  acquisition,  including  the  assumption  of
     Chartwell's   debt  and  the  planned  purchase  by  Chartwell  of  reserve
     protection,  would be approximately $368 million.  The equity consideration
     plus the cost of the reserve protection is approximately equal to 0.9 times
     Chartwell's book value at March 31, 1999.

     The  transaction  is subject to the approval of the  respective  companies'
     shareholders,  expiration  of  the  applicable  waiting  period  under  the
     Hart-Scott-Rodino  Antitrust  Improvements  Act,  regulatory  approvals and
     other customary closing conditions.

     On a combined basis, the new Trenwick would have had assets in excess of $3
     billion, shareholders' equity of $517 million and total capitalization of
     $806 million as of March 31, 1999. Based on current  projections,  combined
     gross written  premiums for 1999 are expected to approximate  $891 million.
     At closing,  the  combination  of Trenwick and Chartwell will result in the
     second largest  independent  reinsurer in the U.S., as measured by surplus.
     The company  would have placed  within the top ten domestic  reinsurers  as
     ranked by surplus on the  Reinsurance  Association  of America's  March 31,
     1999 report.

     The companies believe that the transaction  provides a cost-effective means
     of augmenting  capital,  accelerating  premium growth and adding structural
     platforms  for  further   expansion.   The  addition  of  Chartwell's  U.S.
     reinsurance   business,   its  admitted  and  non-admitted  U.S.  insurance
     companies and its operations at Lloyd's continues

     Trenwick's  strategy of entering  new markets and product  lines that began
     with  Trenwick's  acquisition of Trenwick  International  (formerly  Sorema
     U.K.) in 1998.  Trenwick expects that  consolidating the two companies will
     generate  substantial  economies and financial  benefits and will produce a
     transaction that will be immediately accretive to Trenwick's  shareholders.
     The  combination  is  expected  to produce  $15  million and $25 million in
     expense savings in 2000 and 2001, respectively.

     As part of the transaction, Chartwell will purchase $100 million in reserve
     protection.  The  coverage  will  apply  to  all of  Chartwell's  business,
     including its operations at Lloyd's,  underwritten  prior to closing.  This
     reinsurance insulates the future results of the combined companies from any
     unanticipated problems which may arise from Chartwell's past operations.

     Trenwick  Group Inc.  is a holding  company  with two  principal  operating
     subsidiaries,  Trenwick  America Re, which provides  treaty and facultative
     reinsurance  to  insurers  of  property  and  casualty  risks in the United
     States,   and  Trenwick   International,   which  underwrites   treaty  and
     facultative  reinsurance  as well as  specialty  insurance  on a  worldwide
     basis.  Trenwick America Re is rated A+ (Superior) by A.M. Best Company and
     is  assigned a  claims-paying  ability  rating of A+ by  Standard & Poor's.
     Trenwick  International is rated A (Excellent) by A.M. Best Company and has
     also been  assigned  a  claims-paying  ability  rating of A+ by  Standard &
     Poor's.

     Chartwell is an insurance  holding  company  with global  underwriting  and
     service operations, conducting its business in the United States and in the
     Lloyd's market through its principal operating subsidiaries, Chartwell
     Reinsurance Company, INSCORP and Chartwell Managing Agents Limited ("CMA").
     Chartwell   Reinsurance  Company  underwrites  treaty  reinsurance  through
     reinsurance brokers for casualty and, to a lesser extent, property risks as
     well as for marine and aviation risks. INSCORP writes property and casualty
     insurance through specialty program  administrators.  Chartwell Reinsurance
     Company  and  INSCORP  are  rated  A   (Excellent)   and  A-   (Excellent),
     respectively,  by A.M.  Best Company and are  assigned an A-  claims-paying
     ability rating by Standard & Poor's.  CMA manages seven Lloyd's  syndicates
     with a total  underwriting  capacity for 1999 of  approximately  (pound)300
     million ($500 million).  All of CMA's  syndicates  enjoy the benefit of the
     ratings of Lloyd's, which is rated "A" (Excellent) by A.M. Best Company and
     has an A+ claims-paying ability rating from Standard & Poor's.

     Donaldson, Lufkin & Jenrette Securities Corporation acted as financial
     advisor to Trenwick for the transaction  and Goldman,  Sachs & Co. acted as
     financial  advisor to Chartwell.

                                      * * *
     This press release contains forward looking statements of management's
     beliefs,   estimates,   projections   and  assumptions  for  the  financial
     condition,  results of operations  business and prospects of Trenwick after
     the  transaction,  including  anticipated  cost savings and  potential  for
     premium  growth and  business  expansion  that will result.  These  forward
     looking statements involve certain risks and uncertainties, including those
     detailed  from  time to time in  Trenwick's  and  Chartwell's  reports  and
     filings with the Securities  and Exchange  Commission.  Additional  factors
     that may cause actual results to differ materially from those  contemplated
     by such forward looking  statements  include,  among others,  that expected
     cost savings may not be fully realized within the  anticipated  time frame,
     that difficulties  related to the integration of the businesses of Trenwick
     and Chartwell are greater than expected or that expectations for growth may
     not be realizable.



     June 22, 1999



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