WESTERN NATIONAL CORP
SC 13E3/A, 1998-02-19
LIFE INSURANCE
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<PAGE>
 
================================================================================
                      SECURITIES AND EXCHANGE COMMISSION
                            WASHINGTON, D.C.  20549

                               -----------------
                               AMENDMENT NO. 4     
                                      TO
                                SCHEDULE 13E-3

                       RULE 13E-3 TRANSACTION STATEMENT
      (PURSUANT TO SECTION 13(e) OF THE SECURITIES EXCHANGE ACT OF 1934)

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

                         WESTERN NATIONAL CORPORATION
                             (NAME OF THE ISSUER)

                         WESTERN NATIONAL CORPORATION
                            ASTRO ACQUISITION CORP.
                         AMERICAN GENERAL CORPORATION
                      (NAME OF PERSONS FILING STATEMENT)
                               -----------------
                    COMMON STOCK, PAR VALUE $.001 PER SHARE
                        (TITLE OF CLASS OF SECURITIES)

                                  958845109  
                               (CUSIP Numbers of
                             Class of Securities)

      MORRIS J. KRAMER, ESQ.                       JAMES C. MORPHY, ESQ.
  SKADDEN, ARPS, SLATE, MEAGHER                     SULLIVAN & CROMWELL
          & FLOM LLP                                  125 BROAD STREET
       919 THIRD AVENUE                             NEW YORK, NY  10004
     NEW YORK, NY  10022                               (212) 558-4000
       (212) 735-3000

     (NAME, ADDRESS AND TELEPHONE OF PERSONS AUTHORIZED TO RECEIVE NOTICES
           AND COMMUNICATIONS ON BEHALF OF PERSONS FILING STATEMENT)

This statement is filed in connection with (check the appropriate box):
 
a.   [X]   The filing of solicitation materials or an information statement
           subject to Regulation 14A, Regulation 14C or Rule 13e-3(c) under the
           Securities Exchange Act of 1934.                           
b.   [X]   The filing of a registration statement under the Securities Act of 
           1933.
c.   [_]   A tender offer.
d.   [_]   None of the above.

     Check the following box if the soliciting materials or information
statement referred to in checking box (a) are preliminary copies. [ ]
================================================================================



<PAGE>
 
                                  INTRODUCTION
        
     This Amendment No. 4 to Rule 13e-3 Transaction Statement on Schedule 13E-3
(this "Amendment No. 4 to Schedule 13E-3") is being filed as an amendment to the
Schedule 13E-3 originally filed with the Commission on October 29, 1997 and
subsequently amended on December 19, 1997, January 16, 1998 and January 26, 1998
by Western National Corporation, a Delaware corporation (the "Company"), and
American General Corporation, a Texas corporation ("American General"), and
Astro Acquisition Corp, a Delaware corporation ("Merger Sub"), in connection
with the proposed merger (the "Merger") of Merger Sub with and into the Company
pursuant to an Agreement and Plan of Merger, dated as of September 11, 1997 and
amended as of January 15, 1998 (the "Merger Agreement"), by and among the
Company, American General and Merger Sub.

     The Merger Agreement provides for the merger of Merger Sub with and into
the Company, with the Company being the surviving corporation (the "Surviving
Corporation"). Upon the effectiveness of the Merger (the "Effective Time"), each
share of common stock, par value $.001 per share, of the Company (the "Common
Shares"), issued and outstanding immediately prior to the Effective Time (except
Common Shares held by the Company as treasury stock and Common Shares owned by
American General or any of its subsidiaries) will be converted into and become
exchangeable for, at the election of the holder thereof, the right to receive
(i) $30.8951 in cash (the "Cash Consideration") or (ii) 0.5413 shares of common
stock, par value $.50 per share, of American General (the "Stock
Consideration").
    
     This Amendment No. 4 to Schedule 13E-3 is being filed with the Securities
and Exchange Commission in connection with the registration statement on Form 
S-4 previously filed by American General (the "Proxy Statement/Prospectus") and
declared effective on January 27, 1998. The Proxy Statement/Prospectus is
incorporated herein by reference. The following cross reference sheet is being
supplied pursuant to General Instruction F to Schedule 13E-3 and shows the
location in the Proxy Statement/Prospectus of the information required to be
included in this Amendment No. 4 to Schedule 13E-3. The information contained in
the Proxy Statement/Prospectus, including all the annexes thereto, is expressly
incorporated herein by reference and the responses to each item are qualified in
their entirety by reference to the information contained in the Proxy
Statement/Prospectus and the annexes thereto. Capitalized terms used herein and
not otherwise defined herein shall have the meanings ascribed to such terms in
the Proxy Statement/Prospectus.     

                                       2
<PAGE>
 
<TABLE> 
<CAPTION> 
    
         ITEM NUMBER AND
     CAPTION IN SCHEDULE 13E-3         LOCATION IN THE PROXY STATEMENT
     -------------------------         -------------------------------
<S>  <C>                               <C> 
1.   ISSUER AND CLASS OF SECURITY 
     SUBJECT TO THE TRANSACTION
     (a)                               "Summary of Proxy Statement/Prospectus,"
                                         and "Certain Information
                                         Concerning Western National"
     (b)                               "Summary of Proxy Statement/Prospectus"
                                         and "The Special Meeting"
     (c)                               "Summary of Proxy Statement/Prospectus" 
                                         and "Market Price Data and Dividends"
     (d)                               "Market Price Data and Dividends"
     (e)                               Not Applicable
     (f)                               "Special Factors--Background of the
                                         Merger" "Special Factors--Certain
                                         Transactions in Company Common Stock"

2.    IDENTITY AND BACKGROUND         "Summary of Proxy Statement/Prospectus," 
                                      "Certain Information Concerning American
                                       General" and "Certain Information
                                       Concerning Western National"

3.    PAST CONTACTS, TRANSACTIONS OR
      NEGOTIATIONS
      (a)(1)                           "Special Factors"
      (a)(2)                           "Special Factors"  
      (b)                              "Special Factors"
 
4.   TERMS OF THE TRANSACTION
     (a)                               "Summary of Proxy Statement/Prospectus,"
                                       "Special Factors" and "The Proposed 
                                       Merger"
     (b)                               "Summary of Proxy Statement/Prospectus,"
                                       "Special Factors" and "The Proposed 
                                       Merger"

5.   PLANS OR PROPOSALS OF THE
     ISSUER OR AFFILIATE
     (a) - (g)                         "Special Factors -- Purpose and Structure
                                       of the Merger" and "Special Factors --
                                       Certain Effects of the Merger; Plans
                                       for the Company after the Merger"

6.   SOURCE AND AMOUNTS OF FUNDS
     OR OTHER CONSIDERATION
     (a) - (c)                         "Special Factors -- Source and Amount of
                                       Funds" and "The Proposed Merger --The
                                       Merger Agreement --Expenses "

     (d)                               Not Applicable

7.   PURPOSE(S), ALTERNATIVES,
     REASONS AND EFFECTS
     (a) - (c)                         "Special Factors -- Background of the
                                       Merger," "Special Factors -- Purpose and
                                       Structure of the Merger," "Special
                                       Factors -- Recommendation of the Board of
                                       Directors of the Company and the Special
                                       Committee of: Fairness of the Merger,"
                                       "Special Factors -- Opinion of Western
                                       National's Financial Advisor;" "Special
                                       Factors -- Opinion of American General's
                                       Financial Advisor" and "Special Factors
       </TABLE>


                                       3
<PAGE>
 
<TABLE> 
<S>  <C>                               <C> 
                                       -- Certain Effects of the Merger; Plans 
                                       for the Company after the Merger,"
     (d)                               "Special Factors -- Purpose and Structure
                                       of the Merger," "Special Factors --
                                       Interests of Certain Persons in the
                                       Merger," "Special Factors -- Certain
                                       Effects of the Merger; Plans for the
                                       Company after the Merger," "Special
                                       Factors -- Certain Federal Income Tax
                                       Consequences of the Merger," "Special
                                       Factors -- Accounting Treatment" and
                                       "The Proposed Merger Agreement --
                                       Conversion of Shares"

8.   FAIRNESS OF THE TRANSACTION
     (a) - (e)                         "The Special Meeting -- Votes Required;
                                       Voting Rights," "Special Factors --
                                       Background of the Merger," "Special
                                       Factors -- Purpose and Structure of the
                                       Merger," "Special Factors --
                                       Recommendation of the Board of Directors
                                       of the Company and the Special Committee;
                                       Fairness of the Merger," " Special
                                       Factors -- Opinion of Western National's
                                       Financial Advisor" and "Special Factors
                                       -- Opinion of American General's 
                                       Financial Advisor "

     (f)                               Not Applicable

9.   REPORTS, OPINIONS, APPRAISALS
     AND CERTAIN NEGOTIATIONS
     (a) - (c)                         "Special Factors -- Background of the
                                       Merger," "Special Factors --
                                       Recommendation of the Board of Directors
                                       of the Company and the Special Committee;
                                       Fairness of the Merger," "Special Factors
                                       -- Opinion of Western National's 
                                       Financial Advisor" and "Special Factors 
                                       -- Opinion of American General's 
                                       Financial Advisor "

10.  INTEREST IN SECURITIES OF THE
     ISSUER
     (a)                               "Security Ownership" "Special Factors --
                                       Background of the Merger" and "Special
                                       Factors -- Interests of Certain Persons
                                       in the Merger"
     (b)                               Not Applicable
11.  CONTRACTS, ARRANGEMENTS OR
     UNDERSTANDINGS WITH RESPECT
     TO THE ISSUER'S SECURITIES        "Summary of Proxy Statement/Prospectus,"
                                       "Special Factors -- Background of the
                                       Merger," "The Proposed Merger --
                                       Conversion of Shares," "The Proposed
                                       Merger -- The Merger Agreement --
                                       Conditions to the Merger" and "The
                                       Proposed Merger -- Votes Required, Voting
                                       Rights"

12.  PRESENT INTENTION AND
     RECOMMENDATION OF CERTAIN
     PERSONS WITH REGARD TO THE
     TRANSACTION
     (a) - (b)                         "Summary of Proxy Statement/Prospectus,"
                                       "Special Factors -- Background of the
                                       Merger," "Special Factors --
                                       Recommendation of the Board of Directors
                                       of the Company and the Special Committee;
                                       Fair-

</TABLE> 

                                       4
<PAGE>
 
<TABLE> 
<S>  <C>                               <C> 
                                       ness of the Merger" and "The Special 
                                       Meeting -- Votes Required; Voting Rights"

13.  OTHER PROVISIONS OF THE
     TRANSACTION
     (a)                               "Summary of Proxy Statement/Prospectus"
                                       and "The Proposed Merger -- Rights of
                                       Dissenting Stockholders"
     (b)                               Not Applicable
     (c)                               Not Applicable

14.  FINANCIAL INFORMATION
     (a)                               "Summary of Proxy Statement/Prospectus --
                                       Summary Historical Financial Data of
                                       Western National," "Summary of Proxy
                                       Statement/Prospectus -- Summary
                                       Historical Financial Data of American
                                       General," "Selected Historical Financial
                                       Data of Western National" and "Selected
                                       Historical Financial Data of American
                                       General"
     (b)                               "Summary of Proxy Statement/Prospectus --
                                       Summary Pro Forma Per Share and Other
                                       Data"

15.  PERSONS AND ASSETS EMPLOYED,
     RETAINED OR UTILIZED
     (a)                               "Special Factors -- Interests of Certain
                                       Persons in the Merger," "Special Factors--
                                       Post-Acquisition Compensation and
                                       Benefits," and "The Proposed Merger --The
                                       Merger Agreement -- Expenses"
    (b)                               "The Special Meeting -- Solicitation of 
                                       Proxies"
</TABLE> 

                                       5
<PAGE>
 
ITEM 1.   ISSUER AND CLASS OF SECURITY SUBJECT TO THE TRANSACTION

          (a) The information set forth in "Summary of Proxy
Statement/Prospectus," and "Certain Information Concerning Western National" in
the Proxy Statement/Prospectus is hereby incorporated herein by reference.

          (b) The information set forth in "Summary of Proxy
Statement/Prospectus" and "The Special Meeting" in the Proxy
Statement/Prospectus is hereby incorporated herein by reference.

          (c)  The information set forth in "Summary of Proxy 
Statement/Prospectus" and "Market Price Data and Dividends" in the  
Proxy Statement/Prospectus is hereby incorporated herein by reference.

          (d)  The information set forth in "Market Price Data and Dividends" in
the Proxy Statement/Prospectus is hereby incorporated herein by 
reference.

          (e)  Not Applicable.

          (f) The information set forth in "Special Factors -- Background of the
Merger" and "Special Factors -- Certain Transactions in Company Common Stock" in
the Proxy Statement/Prospectus is hereby incorporated herein by 
reference.

ITEM 2.   IDENTITY AND BACKGROUND

        
          (a) - (d) and (g) This Amendment No. 4 to Schedule 13E-3 is being
filed by the Company, and by Astro Acquisition Corporation and American General
as affiliates of the Company. The Company is the issuer of the common stock
which is the subject of the Rule 13e-3 transaction. The information set forth in
"Summary of Proxy Statement Prospectus," "Certain Information Concerning
American General" and "Certain Information Concerning Western National" in the
Proxy Statement/Prospectus is incorporated herein by reference.     

          The following is certain information regarding the Company's 
affiliates.

          American General Corporation was incorporated in the State of Texas.
Its address is 2929 Allen Parkway, 36th Floor, Houston, Texas  77019.

          Astro Acquisition Corp. was incorporated in the State of Delaware. The
mailing address is c/o American General Corporation, 2929 Allen Parkway, 36th
Floor, Houston, Texas 77019.

          (e) - (f)  During the last five years, no person listed above has been
convicted in a criminal proceeding or has been party to a civil proceeding of a
judicial or administrative body of competent jurisdiction and as a result of
such proceeding was or is subject to a judgment, decree or final order enjoining
further violations of, or prohibiting activities, subject to, federal or state
securities laws or finding any violations of such laws.

ITEM 3.   PAST CONTACTS, TRANSACTIONS OR NEGOTIATIONS.
    
          (a) (1)  The information set forth in "Special Factors" in the 
Proxy Statement/Prospectus is hereby incorporated herein by reference.     

          (a) (2)  The information set forth in "Special Factors" in
the Proxy Statement/Prospectus is hereby incorporated herein by 
reference.

          (b) The information set forth in "Special Factors" in the  
Proxy Statement/Prospectus is hereby incorporated herein by reference.

ITEM 4.   TERMS OF THE TRANSACTION

          (a) The information set forth in "Summary of Proxy
Statement/Prospectus," "Special Factors" and "The Proposed Merger" in the
Proxy Statement/Prospectus is hereby incorporated herein by reference.

          (b) The information set forth in "Summary of Proxy
Statement/Prospectus," "Special Factors" and "The Proposed Merger" in the
Proxy Statement/Prospectus is hereby incorporated herein by reference.

                                       6

<PAGE>
 
ITEM 5.   PLANS OR PROPOSALS OF THE ISSUER OR AFFILIATE

          (a) - (g)  The information set forth in "Special Factors -- Purpose
and Structure of the Merger" and "Special Factors -- Certain Effects of the
Merger; Plans for the Company after the Merger" in the Proxy
Statement/Prospectus is hereby incorporated herein by reference.

ITEM 6.   SOURCE AND AMOUNTS OF FUNDS OR OTHER CONSIDERATION.

          (a) - (c) The information set forth in "Special Factors -- Source and
Amount of Funds" and "The Proposed Merger --The Merger Agreement -- Expenses" in
the Proxy Statement/Prospectus is hereby incorporated herein by 
reference.

          (d)  Not Applicable.

ITEM 7.   PURPOSE(S), ALTERNATIVES, REASONS AND EFFECTS.

          (a) - (c) The information set forth in "Special Factors -- Background
of the Merger;" "Special Factors -- Purpose and Structure of the Merger;"
"Special Factors -- Recommendation of the Board of Directors of the Company and
the Special Committee; Fairness of the Merger," "Special Factors -- Opinion of
Western National's Financial Advisor," "Special Factors -- Opinion of American
General's Financial Advisor," and "Special Factors -- Certain Effects of the
Merger; Plans for the Company after the Merger" in the Proxy
Statement/Prospectus is hereby incorporated herein by reference.

          (d) The information set forth in "Special Factors -- Purpose and
Structure of the Merger," "Special Factors -- Interests of Certain Persons in
the Merger," "Special Factors -- Post Acquisition Compensation and Benefits"
"Special Factors -- Certain Effects of the Merger; Plans for the Company after
the Merger," "The Merger Agreement -- Certain Federal Income Tax Consequences of
the Merger," "Special Factors -- Accounting Treatment," "The Proposed Merger 
Agreement -- Conversion of Shares," "Summary of Proxy Statement/Prospectus --
Summary Pro Forma Per Share and Other Data" and "Risk Factors" in the 
Proxy Statement/Prospectus is hereby incorporated herein by reference.

ITEM 8.   FAIRNESS OF THE TRANSACTION.

          (a) - (e)   The information set forth in "The Special Meeting -- Votes
Required; Voting Rights," "Special Factors -- Background of the Merger;"
"Special Factors -- Purpose and Structure of the Merger," "Special Factors --
Recommendation of the Board of Directors and the Special Committee of the
Company; Fairness of the Merger," "Special Factors  -- Opinion of Western
National's Financial Advisor" and "Special Factors -- Opinion of American
General's Financial Advisor" in the Proxy Statement/Prospectus is hereby
incorporated by reference.

          (f)  Not Applicable.

ITEM 9.   REPORTS, OPINIONS, APPRAISALS AND CERTAIN NEGOTIATIONS.

          (a) - (c) The information set forth in "Special Factors -- Background
of the Merger," "Special Factors -- Recommendation of the Board of Directors of
the Company and the Special Committee; Fairness of the Merger," "Special 
Factors -- Opinion of Western National's Financial Advisor" and "Special 
Factors -- Opinion of American General's Financial Advisor" in the Proxy
Statement/Prospectus is hereby incorporated herein by reference.

          A copy of the DLJ Opinion is attached as Annex B to the Proxy 
Statement/Prospectus; and a copy of the Goldman Sachs opinion is attached as 
Annex C to the Proxy Statement/Prospectus.

ITEM 10.  INTEREST IN SECURITIES OF THE ISSUER.

          (a) The information set forth in "Security Ownership" and "Special
Factors -- Background of the Merger," "Special Factors -- Interests of Certain
Persons in the Merger" in the Proxy Statement/Prospectus is hereby 
incorporated herein by reference.

          (b)  Not Applicable.
                                       7
<PAGE>
 
ITEM 11.  CONTRACTS, ARRANGEMENTS OR UNDERSTANDINGS WITH RESPECT TO THE ISSUER'S
          SECURITIES.

          The information set forth in "Summary of Proxy Statement/Prospectus,"
"Special Factors -- Background of the Merger," "The Proposed Merger --Conversion
of Shares," "The Proposed Merger -- The Merger Agreement -- Conditions to the
Merger" and "The Proposed Merger -- Votes Required; Voting Rights" in the
Proxy Statement/Prospectus is hereby incorporated herein by reference.

ITEM 12.  PRESENT INTENTION AND RECOMMENDATION OF CERTAIN PERSONS WITH REGARD TO
          THE TRANSACTION.

          (a) - (b) The information set forth in "Summary of Proxy
Statement/Prospectus," "Special Factors -- Background of the Merger," "Special
Factors -- Recommendation of the Board of Directors of the Company and the
Special Committee; Fairness of the Merger" and "The Special Meeting -- Votes
Required; Voting Rights" in the Proxy Statement/Prospectus is hereby
incorporated herein by reference.

ITEM 13.  OTHER PROVISIONS OF THE TRANSACTION.

          (a) The information set forth in "Summary of Proxy
Statement/Prospectus" and "The Proposed Merger -- Rights of Dissenting
Stockholders" in the Proxy Statement/Prospectus is hereby incorporated by
reference.

          (b)  Not Applicable.

          (c)  Not Applicable.

ITEM 14.  FINANCIAL INFORMATION.

          (a) The information set forth in "Summary of Proxy
Statement/Prospectus -- Summary Historical Financial Data of Western National;"
"Summary of Proxy Statement/Prospectus -- Summary Historical Financial Data of
American General," "Selected Historical Financial Data of American General"
and "Selected Historical Financial Data of Western National" in the Proxy
Statement/Prospectus is hereby incorporated herein by reference.

          (b) The information set forth in "Summary of Proxy 
Statement/Prospectus -- Summary Pro Forma Per Share and Other Data" in the
Proxy Statement/Prospectus is hereby incorporated herein by reference.

ITEM 15.  PERSONS AND ASSETS EMPLOYED, RETAINED OR UTILIZED.

          (a) The information set forth in "Special Factors -- Interests of
Certain Persons in the Merger," "The Proposed Merger -- The Merger Agreement --
Expenses" and "Special Factors -- Post-Acquisition Compensation and Benefits" in
the Proxy Statement/Prospectus is hereby incorporated herein by reference.

          (b) The information set forth in "The Special Meeting -- Solicitation
of Proxies" in the Proxy Statement/Prospectus is hereby incorporated herein by
reference.

ITEM 16.  ADDITIONAL INFORMATION.

          On February 18, 1998, American General and the Company issued a press 
release announcing the closing date and exchange ratio in connection with the 
Merger. A copy of the press release is attached as Exhibit (c)(2) hereto.

ITEM 17.  MATERIAL TO BE FILED AS EXHIBITS.

          (a) Not Applicable.

          (b)(1) Opinion of Donaldson, Lufkin & Jenrette Securities Corporation
("DLJ"), financial advisor to the Special Committee of the Board of Directors of
Western National Corporation included as Annex B in the Proxy
Statement/Prospectus is hereby incorporated by reference.*

          (b)(2) Written materials prepared by DLJ for the Special Committee of
the Board of Directors of Western National Corporation.*

          (b)(3) Opinion of Goldman, Sachs & Co. ("Goldman Sachs"), financial
advisor to the Board of Directors of American General Corporation included as
Annex C in the Proxy Statement/Prospectus is hereby incorporated by reference.*

          (b)(4) Discussion materials prepared by Goldman Sachs for the Board of
Directors of American General Corporation.*

    
          (c)(1) Agreement and Plan of Merger, dated as of September 11, 1997
and amended as of January 15, 1998, by and among Western National Corporation,
American General Corporation and Astro Acquisition Corporation included as Annex
A in the Proxy Statement/Prospectus is hereby incorporated by reference.*

          (c)(2) Press release issued by American General and the Company on 
February 18, 1998 regarding the announcement of the closing date and the 
exchange ratio with respect to the Merger.

          (d) The Proxy Statement/Prospectus relating to the proposed Merger is
hereby incorporated by reference.

          (e) The information set forth in "Comparison of Stockholder Rights--
Dissenters' Rights" and Section 262 from the Delaware General Corporation Law 
Regarding Appraisal Rights included as Annex D in the Proxy Statement/Prospectus
is hereby incorporated by reference.
 
          (f) Not Applicable.


- ----------------
     * Previously Filed

                                       8
<PAGE>
 

                                   SIGNATURE

  After due inquiry and to the best of my knowledge and belief, I certify that 
the information set forth in this statement is true, complete and correct.
 
        
                                               February 19, 1998     
                                        ----------------------------
                                                   (Date)
                                        
                                          /s/ Nicholas R. Rasmussen
                                        ----------------------------
                                                 (Signature)

                                            Nicholas R. Rasmussen
                                        ----------------------------
                                                   (Name)
                                        American General Corporation

        
                                               February 19, 1998     
                                        ----------------------------
                                                   (Date)

                                              /s/ Pamela J. Penny
                                        ----------------------------
                                                 (Signature)

                                              Pamela J. Penny
                                        ----------------------------
                                                   (Name)
                                           Astro Acquisition Corp.

        
                                             February 19, 1998
                                        ----------------------------
                                                   (Date)

                                          /s/ Dwight L. Cramer
                                        ----------------------------
                                                 (Signature)

                                              Dwight L. Cramer
                                        ----------------------------
                                                   (Name)
                                        Western National Corporation

<PAGE>
 
                                                                  EXHIBIT (C)(2)

<TABLE>
<CAPTION>
 
                    AMERICAN GENERAL                                          WESTERN NATIONAL
                    ----------------                                          ----------------
<S>                 <C>                                                       <C>
 
[American General   David W. Entrekin  or  John E. Pluhowski                  Patrick E. Grady
Logo]               Vice President -            Director - Corporate          Vice President -
                    Investor Relations         Communications                 Investor Relations
                    (212) 446-3109             (713) 831-1149                 (713) 888-7848
</TABLE>


FOR IMMEDIATE RELEASE
- ---------------------

           AMERICAN GENERAL ANNOUNCES CLOSING DATE AND EXCHANGE RATIO
           ----------------------------------------------------------
                    FOR WESTERN NATIONAL CORPORATION ACQUISITION
                    --------------------------------------------


     Houston, February 18, 1998 -- American General Corporation (NYSE: AGC) and
Western National Corporation (NYSE: WNH) today jointly announced that American
General expects to complete the $1.2 billion acquisition of the remaining 54% of
Western National on February 25, 1998. The transaction, which was announced on
September 12, 1997, is subject only to approval by Western National shareholders
at a meeting to be held on February 25, 1998.

     Western National shareholders will receive consideration valued at $30.8951
for each share of Western National common stock. Shareholders may elect to have
each share of their Western National common stock converted into 0.5413 shares
of American General common stock or $30.8951 in cash. Elections for cash and
American General common stock are each limited to no more than 50% of the
aggregate consideration. The number of diluted shares outstanding will increase
from 253.2 million to approximately 264.1 million as a result of the
transaction.

     Both the exchange ratio and cash consideration were computed using an
average price of $57.0719 per share of American General common stock. This
average was determined by the average of the daily high and low sales prices of
American General common stock during the 10 consecutive trading days ending on
February 18, 1998.
<PAGE>
 
     Elections must be made using the Form of Election and Letter of Transmittal
previously mad available to Western National shareholders, and must be received,
together with appropriate share certificates or notice of guaranteed delivery,
by First Chicago Trust Company of New York, the Exchange Agent, no later than
5:00 p.m. EST on February 23, 1998. A description of the election and allocation
procedures is included in the Proxy Statement/Prospectus previously delivered to
Western National shareholders. Western National shareholders requesting
additional information or a Form of Election and Letter of Transmittal should
contact Morrow & Company, Inc., the Information Agent, by calling (800) 662-
5200.

     In December 1994, American General acquired 40% of Western National for
$274 million or $11 per share. American General increased its ownership interest
in Western National to 46% in September 1996 for $130 million or $17.92 per
share.

                                       2
<PAGE>
 
     Founded in 1944 and headquartered in Houston, Texas, Western National
Corporation is a leading provider of retirement annuity products.  The company
has assets of more than $11 billion and annuity reserves of $10 billion. Western
National is the parent company of Western National Life Insurance Company, one
of the largest life insurance companies in the United States.

               __________________________________________________

     American General Corporation is one of the nation's largest diversified
financial services organizations with assets of $81 billion and shareholders'
equity of $7.6 billion.  Headquartered in Houston, it is a leading provider of
retirement services, life insurance, and consumer loans to 12 million customers.
American General common stock is listed on the New York, Pacific, London, and
Swiss stock exchanges.

                                       3



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