CHIEFTAIN INTERNATIONAL INC
SC 13G/A, 1998-02-11
CRUDE PETROLEUM & NATURAL GAS
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                        SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  SCHEDULE 13G/A

                    Under the Securities Exchange Act of 1934
                               (Amendment No. 2)*

                                Chieftan International
              ----------------------------------------------------
                                (Name of Issuer)

                               Common Stock-Equity
              ----------------------------------------------------
                         (Title of Class of Securities)

                                    16867C10
              ----------------------------------------------------
                                 (CUSIP Number)

Check the following box if a fee is  being paid with this statement [_].
(A fee is not required only if the filing person:  (1) has a previous  statement
on file reporting beneficial ownership of more than five percent of the class of
securities  described  in Item 1;  and (2) has  filed  no  amendment  subsequent
thereto reporting  beneficial  ownership of five percent or less of such class.)
(See Rule 13d-7.)

*The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities, and
for any subsequent amendment containing information which would alter
disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the Securities Exchange Act of
1934 ("Act") or otherwise subject to the liabilities of that section of the Act
but shall be subject to all other provisions of the Act (however, see the
Notes).
<PAGE>

CUSIP No. 16867C10                    13G                   Page 1 of 13 pages

- --------------------------------------------------------------------------------
1     Name of Reporting Person
      S.S. or I.R.S. Identification No. of Above Person

      The Guardian Life Insurance Company of America
      13-2656036
- --------------------------------------------------------------------------------
2     Check the Appropriate Box If a Member of a Group
                                    a.  |X|
                                    b.  |_|
- --------------------------------------------------------------------------------
3     SEC Use Only

- --------------------------------------------------------------------------------
4     Citizenship or Place of Organization

      201 Park Avenue South 
      New York, New York  10003
- --------------------------------------------------------------------------------
                  5     Sole Voting Power
  Number of
   Shares               406,200
Beneficially            --------------------------------------------------------
  Owned By        6     Shared Voting Power
    Each
  Reporting             128,800  (See pages 8 and 9)
   Person               --------------------------------------------------------
    With          7     Sole Dispositive Power
 
                        406,200
                        --------------------------------------------------------
                  8     Shared Dispositive Power
 
                        128,800  (See pages 8 and 9) 
                        --------------------------------------------------------

- --------------------------------------------------------------------------------
9     Aggregate Amount Beneficially Owned by Each Reporting Person

      1,107,000 (406,200 + 185,000 + 304,000 + 8,000 + 38,000 + 37,000 + 
      87,600 + 41,200)
- --------------------------------------------------------------------------------
10    Check Box If the Aggregate Amount in Row (9) Excludes Certain Shares*  |_|


- --------------------------------------------------------------------------------
11    Percent of Class Represented By Amount in Row (9)

      8.13%
- --------------------------------------------------------------------------------
12    Type of Reporting Person*

      IC
- --------------------------------------------------------------------------------


                    *SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE>


CUSIP No. 16867C10                    13G                   Page 2 of 13 pages

- --------------------------------------------------------------------------------
1     Name of Reporting Person
      S.S. or I.R.S. Identification No. of Above Person

      The Guardian Investor Services Corporation

- --------------------------------------------------------------------------------
2     Check the Appropriate Box If a Member of a Group
                                    a.  |X|
                                    b.  |_|
- --------------------------------------------------------------------------------
3     SEC Use Only

- --------------------------------------------------------------------------------
4     Citizenship or Place of Organization

      201 Park Avenue South 
      New York, New York  10003
- --------------------------------------------------------------------------------
                  5     Sole Voting Power
  Number of
   Shares               
Beneficially            --------------------------------------------------------
  Owned By        6     Shared Voting Power
    Each
  Reporting             572,000 (See pages 3-7)
   Person               --------------------------------------------------------
    With          7     Sole Dispositive Power                                  
                                                                                
                                                                                
                        --------------------------------------------------------
                  8     Shared Dispositive Power

                        572,000 (See pages 3-7)
                        --------------------------------------------------------
                  
- --------------------------------------------------------------------------------
9     Aggregate Amount Beneficially Owned by Each Reporting Person

      1,107,000 (406,200 + 185,000 + 304,000 + 8,000 + 38,000 + 37,000 + 
      87,600 + 41,200)
- --------------------------------------------------------------------------------
10    Check Box If the Aggregate Amount in Row (9) Excludes Certain Shares  |_|


- --------------------------------------------------------------------------------
11    Percent of Class Represented By Amount in Row (9)

      8.13%
- --------------------------------------------------------------------------------
12    Type of Reporting Person*

      IA
- --------------------------------------------------------------------------------


                    *SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE>


CUSIP No. 16867C10                    13G                   Page 3 of 13 pages

- --------------------------------------------------------------------------------
1     Name of Reporting Person
      S.S. or I.R.S. Identification No. of Above Person

      The Guardian Park Avenue Fund

- --------------------------------------------------------------------------------
2     Check the Appropriate Box If a Member of a Group
                                    a.  |X|
                                    b.  |_|
- --------------------------------------------------------------------------------
3     SEC Use Only

- --------------------------------------------------------------------------------
4     Citizenship or Place of Organization

      201 Park Avenue South 
      New York, New York  10003
- --------------------------------------------------------------------------------
                  5     Sole Voting Power
  Number of
   Shares               
Beneficially            --------------------------------------------------------
  Owned By        6     Shared Voting Power
    Each
  Reporting             185,000 (See page 2)
   Person               --------------------------------------------------------
    With          7     Sole Dispositive Power                                  
                                                                                
                                                                                
                        --------------------------------------------------------
                  8     Shared Dispositive Power                                
                                                                                
                        185,000 (See page 2)                                  
                        --------------------------------------------------------
                  
                  
- --------------------------------------------------------------------------------
9     Aggregate Amount Beneficially Owned by Each Reporting Person

      1,107,000 (406,200 + 185,000 + 304,000 + 8,000 + 38,000 + 37,000 + 
      87,600 + 41,200)
- --------------------------------------------------------------------------------
10    Check Box If the Aggregate Amount in Row (9) Excludes Certain Shares  |_|


- --------------------------------------------------------------------------------
11    Percent of Class Represented By Amount in Row (9)

      8.13%
- --------------------------------------------------------------------------------
12    Type of Reporting Person*

      IV
- --------------------------------------------------------------------------------


                    *SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE>


CUSIP No. 16867C10                    13G                   Page 4 of 13 pages

- --------------------------------------------------------------------------------
1     Name of Reporting Person
      S.S. or I.R.S. Identification No. of Above Person

      The Guardian Stock Fund, Inc.

- --------------------------------------------------------------------------------
2     Check the Appropriate Box If a Member of a Group
                                    a.  |X|
                                    b.  |_|
- --------------------------------------------------------------------------------
3     SEC Use Only

- --------------------------------------------------------------------------------
4     Citizenship or Place of Organization

      201 Park Avenue South 
      New York, New York  10003
- --------------------------------------------------------------------------------
                  5     Sole Voting Power
  Number of
   Shares               
Beneficially            --------------------------------------------------------
  Owned By        6     Shared Voting Power
    Each
  Reporting             304,000 (See page 2)
   Person               --------------------------------------------------------
    With          7     Sole Dispositive Power                                  
                                                                                
                                                                                
                        --------------------------------------------------------
                  8     Shared Dispositive Power                                
                                                                                
                        304,000 (See page 2)                                  
                        --------------------------------------------------------
                  
- --------------------------------------------------------------------------------
9     Aggregate Amount Beneficially Owned by Each Reporting Person

      1,107,000 (406,200 + 185,000 + 304,000 + 8,000 + 38,000 + 37,000 + 
      87,600 + 41,200)
- --------------------------------------------------------------------------------
10    Check Box If the Aggregate Amount in Row (9) Excludes Certain Shares  |_|


- --------------------------------------------------------------------------------
11    Percent of Class Represented By Amount in Row (9)

      8.13%
- --------------------------------------------------------------------------------
12    Type of Reporting Person*

      IV
- --------------------------------------------------------------------------------


                   *SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE>


CUSIP No. 16867C10                    13G                   Page 5 of 13 pages

- --------------------------------------------------------------------------------
1     Name of Reporting Person
      S.S. or I.R.S. Identification No. of Above Person

      The Guardian Asset Allocation Fund

- --------------------------------------------------------------------------------
2     Check the Appropriate Box If a Member of a Group
                                    a.  |X|
                                    b.  |_|
- --------------------------------------------------------------------------------
3     SEC Use Only

- --------------------------------------------------------------------------------
4     Citizenship or Place of Organization

      201 Park Avenue South 
      New York, New York  10003
- --------------------------------------------------------------------------------
                  5     Sole Voting Power
  Number of
   Shares               
Beneficially            --------------------------------------------------------
  Owned By        6     Shared Voting Power
    Each
  Reporting             8,000 (See page 2)
   Person               --------------------------------------------------------
    With          7     Sole Dispositive Power                                  
                                                                                
                                                                                
                        --------------------------------------------------------
                  8     Shared Dispositive Power                                
                                                                                
                        8,000 (See page 2)                                  
                        --------------------------------------------------------
                  
                  
- --------------------------------------------------------------------------------
9     Aggregate Amount Beneficially Owned by Each Reporting Person

      1,107,000 (406,200 + 185,000 + 304,000 + 8,000 + 38,000 + 37,000 + 
      87,600 + 41,200)
- --------------------------------------------------------------------------------
10    Check Box If the Aggregate Amount in Row (9) Excludes Certain Shares  |_|


- --------------------------------------------------------------------------------
11    Percent of Class Represented By Amount in Row (9)

      8.13%
- --------------------------------------------------------------------------------
12    Type of Reporting Person*

      IV
- --------------------------------------------------------------------------------


                   *SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE>


CUSIP No. 16867C10                    13G                   Page 6 of 13 pages

- --------------------------------------------------------------------------------
1     Name of Reporting Person
      S.S. or I.R.S. Identification No. of Above Person

      The Guardian Park Avenue Small Cap Fund

- --------------------------------------------------------------------------------
2     Check the Appropriate Box If a Member of a Group
                                    a.  |X|
                                    b.  |_|
- --------------------------------------------------------------------------------
3     SEC Use Only

- --------------------------------------------------------------------------------
4     Citizenship or Place of Organization

      201 Park Avenue South 
      New York, New York  10003
- --------------------------------------------------------------------------------
                  5     Sole Voting Power
  Number of
   Shares               
Beneficially            --------------------------------------------------------
  Owned By        6     Shared Voting Power
    Each
  Reporting             38,000 (See page 2)
   Person               --------------------------------------------------------
    With          7     Sole Dispositive Power                                  
                                                                                
                                                                                
                        --------------------------------------------------------
                  8     Shared Dispositive Power                                
                                                                                
                        38,000 (See page 2)                                  
                        --------------------------------------------------------
                  
                  
- --------------------------------------------------------------------------------
9     Aggregate Amount Beneficially Owned by Each Reporting Person

      1,107,000 (406,200 + 185,000 + 304,000 + 8,000 + 38,000 + 37,000 + 
      87,600 + 41,200)
- --------------------------------------------------------------------------------
10    Check Box If the Aggregate Amount in Row (9) Excludes Certain Shares  |_|


- --------------------------------------------------------------------------------
11    Percent of Class Represented By Amount in Row (9)

      8.13%
- --------------------------------------------------------------------------------
12    Type of Reporting Person*

      IV
- --------------------------------------------------------------------------------


                    *SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE>


CUSIP No. 16867C10                    13G                   Page 7 of 13 pages

- --------------------------------------------------------------------------------
1     Name of Reporting Person
      S.S. or I.R.S. Identification No. of Above Person

      The Guardian Small Cap Stock Fund

- --------------------------------------------------------------------------------
2     Check the Appropriate Box If a Member of a Group
                                    a.  |X|
                                    b.  |_|
- --------------------------------------------------------------------------------
3     SEC Use Only

- --------------------------------------------------------------------------------
4     Citizenship or Place of Organization

      201 Park Avenue South 
      New York, New York  10003
- --------------------------------------------------------------------------------
                  5     Sole Voting Power
  Number of
   Shares               
Beneficially            --------------------------------------------------------
  Owned By        6     Shared Voting Power
    Each
  Reporting             37,000 (See page 2)
   Person               --------------------------------------------------------
    With          7     Sole Dispositive Power                                  
                                                                                
                                                                                
                        --------------------------------------------------------
                  8     Shared Dispositive Power                                
                                                                                
                        37,000 (See page 2)                                  
                        --------------------------------------------------------
                  
- --------------------------------------------------------------------------------
9     Aggregate Amount Beneficially Owned by Each Reporting Person

      1,107,000 (406,200 + 185,000 + 304,000 + 8,000 + 38,000 + 37,000 + 
      87,600 + 41,200)
- --------------------------------------------------------------------------------
10    Check Box If the Aggregate Amount in Row (9) Excludes Certain Shares  |_|


- --------------------------------------------------------------------------------
11    Percent of Class Represented By Amount in Row (9)

      8.13%
- --------------------------------------------------------------------------------
12    Type of Reporting Person*

      IV
- --------------------------------------------------------------------------------


                    *SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE>


CUSIP No. 16867C10                    13G                   Page 8 of 13 pages

- --------------------------------------------------------------------------------
1     Name of Reporting Person
      S.S. or I.R.S. Identification No. of Above Person

      The Guardian Employees' Incentive Savings Plan
- --------------------------------------------------------------------------------
2     Check the Appropriate Box If a Member of a Group
                                    a.  |X|
                                    b.  |_|
- --------------------------------------------------------------------------------
3     SEC Use Only

- --------------------------------------------------------------------------------
4     Citizenship or Place of Organization

      201 Park Avenue South 
      New York, New York  10003
- --------------------------------------------------------------------------------
                  5     Sole Voting Power
  Number of
   Shares               
Beneficially            --------------------------------------------------------
  Owned By        6     Shared Voting Power
    Each
  Reporting             87,600 (See page 1)
   Person               --------------------------------------------------------
    With          7     Sole Dispositive Power                                  
                                                                                
                                                                                
                        --------------------------------------------------------
                  8     Shared Dispositive Power                                
                                                                                
                        87,600 (See page 1)
                        --------------------------------------------------------
                  
- --------------------------------------------------------------------------------
9     Aggregate Amount Beneficially Owned by Each Reporting Person

      1,107,000 (406,200 + 185,000 + 304,000 + 8,000 + 38,000 + 37,000 + 
      87,600 + 41,200)
- --------------------------------------------------------------------------------
10    Check Box If the Aggregate Amount in Row (9) Excludes Certain Shares  |_|


- --------------------------------------------------------------------------------
11    Percent of Class Represented By Amount in Row (9)

      8.13%
- --------------------------------------------------------------------------------
12    Type of Reporting Person*

      EP
- --------------------------------------------------------------------------------


                    *SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE>

CUSIP No. 16867C10                    13G                  Page 9 of 13 pages

- --------------------------------------------------------------------------------
1     Name of Reporting Person
      S.S. or I.R.S. Identification No. of Above Person

      The Guardian Life Insurance Company of America
          Master Pension Trust
- --------------------------------------------------------------------------------
2     Check the Appropriate Box If a Member of a Group
                                    a.  |X|
                                    b.  |_|
- --------------------------------------------------------------------------------
3     SEC Use Only

- --------------------------------------------------------------------------------
4     Citizenship or Place of Organization

      201 Park Avenue South 
      New York, New York  10003
- --------------------------------------------------------------------------------
                  5     Sole Voting Power
  Number of
   Shares               
Beneficially            --------------------------------------------------------
  Owned By        6     Shared Voting Power
    Each
  Reporting             41,200 (See page 1)
   Person               --------------------------------------------------------
    With          7     Sole Dispositive Power                                  
                                                                                
                                                                                
                        --------------------------------------------------------
                  8     Shared Dispositive Power                                
                                                                                
                        41,200 (See page 1)
                        --------------------------------------------------------
                  
- --------------------------------------------------------------------------------
9     Aggregate Amount Beneficially Owned by Each Reporting Person

      1,107,000 (406,200 + 185,000 + 304,000 + 8,000 + 38,000 + 37,000 + 
      87,600 + 41,200)
- --------------------------------------------------------------------------------
10    Check Box If the Aggregate Amount in Row (9) Excludes Certain Shares  |_|


- --------------------------------------------------------------------------------
11    Percent of Class Represented By Amount in Row (9)

      8.13%
- --------------------------------------------------------------------------------
12    Type of Reporting Person*

      EP
- --------------------------------------------------------------------------------

                     *SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE>

                                                                   Page 10 of 13

Item 1.     (a)   Chieftan International 
                 
            (b)   1201 Toronto Dominion Tower, Edmonton, Alberta T5J 2Z1 Canada
                 
Item 2.     (a)   Incorporated by reference to Item 1 of the second parts of the
                  cover page (Pages 1-9 of this Schedule 13G
                 
            (b)   201 Park Avenue South, New York, New York 10003
                 
            (c)   New York, U.S.A.
                 
            (d)   Common Stock Class A
                 
            (e)   CUSIP 16867C10
               
Item 3.     If this statement is filed pursuant to Rules 13d-1(b), or  
            13d-2(b), check whether the person filing is:

            (a)   [ ]   Broker or Dealer registered under Section 15 of the
                        Act 

            (b)   [ ]   Bank as defined in section 3(a)(6) of the Act

            (c)   [ ]   Insurance Company as defined in section 3(a)(19) of
                        the Act

            (d)   [ ]   Investment Company registered under section 8 of the
                        Investment Company Act

            (e)   [ ]   Investment Adviser registered under section 203 of the
                        Investment Advisers Act of 1940

            (f)   [ ]   Employee Benefit Plan, Pension Fund which is subject
                        to the provisions of the Employee Retirement Income
                        Security Act of 1974 or Endowment Fund; see Reg.
                        240.13d-1(b)(1)(ii)(F)

            (g)   [ ]   Parent Holding Company, in accordance  with Reg.
                        240.13d-1(b)(1)(ii)(G) (Note: See item 7)

            (h)   [X]   Group, in accordance with Reg. 240.13d-1(b)(1)(ii)(H)
<PAGE>

                                                                   Page 11 of 13


Item 4.     Ownership.

            (a)  1,107,000 shares)
                                 )
            (b)    8.13%         ) Cumulative totals from Items 5-8, 9 and
                                 ) 11 of the second parts of the cover page
            (c)  (i) 406,200     ) (Pages 1-9 of this Schedule 13G) which
                (ii) 700,800     ) are incorporated herein by reference.
               (iii) 406,200     )
                (iv) 700,800

Item 5.     Ownership of Five Percent or Less of a Class.

            Not Applicable

Item 6.     Ownership of More Than Five Percent on Behalf of Another Person.

            Not applicable

Item 7.     Identification and Classification of the Subsidiary which Acquired
            the Security Being Reported on By the Parent Holding Company.

            Not applicable

Item 8.     Identification and Classification of Members of the Group.

a.   The Guardian Life Insurance Company of America ("Guardian Life"), an
     insurance company as defined in Section 3(a)(19) of the Act. IC.

b.   Guardian Investor Services Corporation ("GISC"), a wholly-owned  subsidiary
     of Guardian Life which is registered as an investment adviser under Section
     203 of the  Investment  Advisers  Act of 1940,  and which has entered  into
     Investment  Advisory  Agreements with The Guardian Park Ave. Fund, Inc. and
     The Guardian Stock Fund, Inc. IA.

c.   The Guardian Park Ave. Fund, a mutual fund sponsored by Guardian
     Life and managed by GISC which is registered as an investment company
     under Section 8 of the Investment Company Act of 1940 (the "1940
     Act"). IV.

d.   The Guardian Stock Fund, Inc., a mutual fund sponsored by Guardian
     Life and managed by GISC which is registered as an investment company
     under Section 8 of the 1940 Act. IV.

e    The Guardian Asset Allocation Fund, a mutual fund sponsored by Guardian
     Life and managed by GISC which is registered as an investment company
     under Section 8 of the 1940 Act. IV.

f.   The Guardian Park Ave. Small Cap Fund, a mutual fund sponsored by Guardian
     Life and managed by GISC which is registered as an investment company under
     Section 8 of the 1940 Act. IV.

g.   The Guardian Small Cap Stock Fund, a mutual fund sponsored by Guardian
     Life and managed by GISC which is registered as an investment company under
     Section 8 of the 1940 Act. IV
<PAGE>

                                                                   Page 12 of 13


h.   The Guardian Employees' Incentive Savings Plan, an employee benefit
     plan offered to employees of Guardian Life which is subject to the
     provisions of the Employees Retirement Income Security Act of 1974
     ("ERISA") EP.

i.   The Guardian Life Insurance Company of America Master Pension Trust, a
     pension fund for the the employees of Guardian Life which is subject
     to ERISA. EP.

Item 9.     Notice of Dissolution of Group.

            Not applicable

Item 10.    Certification.

     By signing below we certify that, to the best of our knowledge and
belief, the securities referred to above were acquired in the ordinary
course of business and were not acquired for the purpose of and do not have
the effect of changing or influencing the control of the issuer of such
securities and were not acquired in connection with or as a participant in
any transaction having such purpose or effect.

                      (This space intentionally left blank)
<PAGE>

                                                                   Page 13 of 13


                                    SIGNATURE

     After reasonable inquiry and to the best of our knowledge and belief,
we each certify that the information set forth in this statement is true,
complete and correct.

     Each of the undersigned hereby agrees that the forgoing Schedule 13G
is to be filed on its behalf by The Guardian Life Insurance Company of
America.

Date: February 11, 1998


The Guardian Life Insurance Company of America


By:   /s/ Edward K. Kane
   ---------------------------------------------
     Edward K. Kane, Executive Vice President


Guardian Investor Services Corporation


By:   /s/ John M. Smith
   ---------------------------------------------
     John M. Smith, President


The Guardian Park Ave. Fund


By:   /s/ Nikolaos Monoyios
   ---------------------------------------------
     Nikolaos Monoyios, Vice President


The Guardian Stock Fund, Inc.


By:   /s/ Nikolaos Monoyios
   ---------------------------------------------
     Nikolaos Monoyios, Vice President

The Guardian Asset Allocation Fund


By:   /s/ Nikolaos Monoyios
   ---------------------------------------------
     Nikolaos Monoyios, Vice President


The Guardian Park Ave. Small Cap Fund


By:   /s/ Nikolaos Monoyios
   ---------------------------------------------
     Nikolaos Monoyios, Vice President


The Guardian Small Cap Stock Fund


By:   /s/  John M. Smith
   ---------------------------------------------
      John M. Smith, President


The Guardian Employees' Incentive Savings Plan


By:   /s/ Edward K. Kane   
   ---------------------------------------------
     Edward K. Kane, Trustee


The Guardian Life Insurance Company of America
     Master Pension Trust


By:   /s/ Edward K. Kane
   ---------------------------------------------
     Edward K. Kane, Trustee



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