Document:

<PAGE>
                                                                   EXHIBIT 10.11

                  SIXTH AMENDMENT TO CANADIAN CREDIT AGREEMENT

         THIS SIXTH AMENDMENT TO CANADIAN CREDIT AGREEMENT (herein called this
"Amendment") made as of October 5, 2001 by and among Northstar Energy
Corporation, an Alberta corporation ("Canadian Borrower"), Bank of America
Canada, individually and as administrative agent ("Canadian Agent"), and the
Canadian Lenders party to the Original Agreement defined below ("Canadian
Lenders").

                                   WITNESSETH:

         WHEREAS, Canadian Borrower, Canadian Agent and Canadian Lenders entered
into that certain Canadian Credit Agreement dated as of August 29, 2000 (as
amended, supplemented, or restated to the date hereof, the "Original
Agreement"), for the purpose and consideration therein expressed, whereby
Canadian Lenders became obligated to make loans to Canadian Borrowers as therein
provided;

         WHEREAS, Canadian Borrower, Canadian Agent and Canadian Lenders desire
to amend the Original Agreement as set forth herein;

         NOW, THEREFORE, in consideration of the premises and the mutual
covenants and agreements contained herein and in the Original Agreement, in
consideration of the loans which may hereafter be made by Canadian Lenders to
Canadian Borrower, and for other good and valuable consideration, the receipt
and sufficiency of which are hereby acknowledged, the parties hereto do hereby
agree as follows:

                                   ARTICLE I.

                           Definitions and References

         Section 1.1. Terms Defined in the Original Agreement. Unless the
context otherwise requires or unless otherwise expressly defined herein, the
terms defined in the Original Agreement shall have the same meanings whenever
used in this Amendment.

         Section 1.2. Other Defined Terms. Unless the context otherwise
requires, the following terms when used in this Amendment shall have the
meanings assigned to them in this Section 1.2.

                  "Amendment" means this Sixth Amendment to Canadian Credit
         Agreement.

                  "Canadian Agreement" means the Original Agreement as amended
         hereby.

<PAGE>

                  "Mitchell" means Mitchell Energy & Development Corp., a Texas
         corporation, and its successors and assigns.

                  "Mitchell Restructuring Event" means one or a series of
         transactions pursuant to which US Borrower may form or cause to be
         formed a new holding company under the law of any state of the United
         States of America, which pursuant to one or more mergers or other
         transactions would acquire all of the outstanding common stock of each
         of US Borrower and Mitchell.

                                   ARTICLE II.

                        Amendments to Original Agreement

         Section 2.1. Defined Terms.

         (a) The following definitions of "Anderson Financing", "Devon HoldCo",
"Mitchell" and "Mitchell Restructuring Event" are hereby added to Annex I to the
Original Agreement in alphabetical order:

                  "Anderson Financing" means (i) the closing of and funding of
         the initial loans under a senior unsecured bank facility in an amount
         not to exceed US $3,032,000,000 arranged by UBS Warburg LLC and Banc of
         America Securities LLC to finance the acquisition by US Borrower of
         Anderson Exploration Ltd. and/or Mitchell through wholly-owned
         Subsidiaries of US Borrower or, in the case of Mitchell, through a
         Mitchell Restructuring Event, and (ii) the acquisition shares of
         Anderson Exploration Ltd. by US Borrower or a Restricted Subsidiary
         pursuant to US Borrower's offer to purchase the shares of Anderson
         Exploration Ltd.

                  "Devon HoldCo" means a new holding company formed under the
         law of any state of the United States of America to effect a Mitchell
         Restructuring Event, together with its successors and assigns.

                  "Mitchell" means Mitchell Energy & Development Corp., a Texas
         corporation, and its successors and assigns.

                  "Mitchell Restructuring Event" means one or a series of
         transactions pursuant to which US Borrower may form or cause to be
         formed a new holding company under the law of any state of the United
         States of America, which pursuant to one or more mergers or other
         transactions would acquire all of the outstanding common stock of each
         of US Borrower and Mitchell.

         (b) The definitions of "Change of Control", "Consolidated Assets",
"ERISA Affiliate", "Material Adverse Effect", "Material Subsidiary", "Restricted
Person", "Restricted Subsidiary",

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                                    Sixth Amendment to Canadian Credit Agreement
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"Total Capitalization" and "US GAAP" in Annex I to the Original Agreement are
hereby amended in their entirety to read as follows:

                  "Change of Control" means the occurrence of either of the
         following events: (i) any Person (or syndicate or group of Persons
         which is deemed a "person" for the purposes of Section 13(d)(3) of the
         Securities Exchange Act of 1934, as amended) acquires more than fifty
         percent (50%) of the outstanding stock of Devon HoldCo having ordinary
         voting power (disregarding changes in voting power based on the
         occurrence of contingencies) for the election of directors, or (ii)
         during any period of twelve successive months a majority of the Persons
         who were directors of Devon HoldCo at the beginning of such period
         cease to be directors of Devon HoldCo, unless such cessation relates to
         a voluntary reduction by Devon HoldCo of the number of directors that
         comprise the board of directors of Devon HoldCo. For the avoidance of
         doubt, the Mitchell Restructuring Event shall not constitute or be
         deemed to constitute a "Change of Control" for purposes of the US
         Agreement, the Canadian Agreement or any other Loan Document.

                  "Consolidated Assets" means the total assets of Devon HoldCo
         and its Restricted Subsidiaries which would be shown as assets on a
         Consolidated balance sheet of Devon HoldCo and its Restricted
         Subsidiaries prepared in accordance with US GAAP, after eliminating all
         amounts properly attributable to minority interest, if any, in the
         stock and surplus of the Restricted Subsidiaries.

                  "ERISA Affiliate" means Devon HoldCo and all members of a
         controlled group of corporations and all trades or businesses (whether
         or not incorporated) under common control that, together with Devon
         HoldCo, are treated as a single employer under Section 414 of the
         Internal Revenue Code.

                  "Material Adverse Effect" means any event which would
         reasonably be expected to have a material and adverse effect upon (a)
         Devon HoldCo's Consolidated financial condition, (b) Devon HoldCo's
         Consolidated operations, properties or prospects, considered as a
         whole, (c) US Borrower's ability to timely pay the Obligations, or (d)
         the enforceability of the material terms of any Loan Documents.

                  "Material Subsidiary" means a Subsidiary of Devon HoldCo other
         than US Borrower which owns assets having a book value that exceeds ten
         percent (10%) of the book value of Devon HoldCo's Consolidated assets.

                  "Restricted Person" means any of Devon HoldCo, US Borrower and
         each Restricted Subsidiary.

                  "Restricted Subsidiary" means Canadian Borrower, Devon
         Oklahoma, Devon SFS, Mitchell and any other Subsidiary of Devon HoldCo
         (other than US Borrower) that is not an Unrestricted Subsidiary.

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                                    Sixth Amendment to Canadian Credit Agreement
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                  "Total Capitalization" means the sum (without duplication) of
         (i) Devon HoldCo's Consolidated Total Funded Debt plus (ii) Devon
         HoldCo's Consolidated shareholder's equity plus (iii) 60% of the
         outstanding balance of the Devon Trust Securities. Total Capitalization
         shall be calculated excluding non-cash write-downs and related charges
         which are required under Rule 4-10 (Financial Accounting and Reporting
         for Oil and Gas Producing Activities Pursuant to the Federal Securities
         Laws and the Energy Policy and Conservation Act of 1975) of Regulation
         S-X promulgated by Securities and Exchange Commission Regulation, or by
         US GAAP.

                  "US GAAP" means those generally accepted accounting principles
         and practices which are recognized as such from time to time by the
         Financial Accounting Standards Board (or any generally recognized
         successor) and which, in the case of Devon HoldCo and its Consolidated
         Subsidiaries, are applied in a manner consistent with the manner in
         which such principles and practices were applied in the Initial
         Financial Statements.

         (c) The first sentence of the definition of "Unrestricted Subsidiary"
in Annex I to the Original Agreement is hereby amended in its entirety to read
as follows:

                  "Unrestricted Subsidiary" means any corporation, association,
         partnership, limited liability company, joint venture, or other
         business or corporate entity, enterprise or organization (i) which is
         listed below in this definition, or (ii) in which US Borrower did not
         own an interest (directly or indirectly) as of August 29, 2001, which
         thereafter became a Subsidiary of US Borrower or Devon HoldCo and
         which, within 90 days after becoming a Subsidiary of US Borrower or
         Devon HoldCo, was designated as an Unrestricted Subsidiary by US
         Borrower to US Agent; provided that in the event any such Subsidiary
         becomes a Material Subsidiary at any time, such Subsidiary shall cease
         to be an Unrestricted Subsidiary at such time and shall automatically
         become a Restricted Subsidiary.

         (d) The definition of "Permitted Liens" is hereby amended by
substituting the words "US Borrower, Devon HoldCo" for the words "US Borrower".

         (e) The definition of "Subordinated US Borrower Debentures" is hereby
amended by substituting the words "Devon HoldCo or US Borrower" for the words
"US Borrower".

         Section 2.2. Affirmative Covenants.

         (a) The first sentence of Section 6.2(a), the first sentence of Section
6.2(b), and Section 6.2(c) of the Original Agreement are hereby amended by
substituting the words "Devon HoldCo" for the words "US Borrower".

         (b) Section 6.13 of the Original Agreement is hereby amended in its
entirety to read as follows:

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                                    Sixth Amendment to Canadian Credit Agreement
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                  "Section 6.13 Bank Accounts; Offset.Canadian Borrower hereby
         agrees that each Canadian Lender shall have the right to offset (which
         shall be in addition to all other interests, liens, and rights of any
         Lender at common Law, under the Loan Documents, or otherwise) (a) any
         and all moneys, securities or other property (and the proceeds
         therefrom) of Canadian Borrower now or hereafter held or received by or
         in transit to any Canadian Lender for the account of Canadian Borrower,
         (b) any and all deposits (general or special, time or demand,
         provisional or final) of Canadian Borrower with any Canadian Lender,
         (c) any other credits and balances of Canadian Borrower at any time
         existing against any Canadian Lender, including claims under
         certificates of deposit, and (d) any indebtedness owed or payable by
         any Lender to Canadian Borrower at any time against Canadian
         Obligations due to it that have not been paid when due. At any time and
         from time to time after the occurrence of any Event of Default and
         during the continuance thereof, each Lender is hereby authorized to
         offset against the Canadian Obligations then due and payable to it (in
         either case without notice to Canadian Borrower), any and all items
         hereinabove referred to. To the extent that Canadian Borrower has
         accounts designated as royalty or joint interest owner accounts, the
         foregoing right of offset shall not extend to funds in such accounts
         which belong to, or otherwise arise from payments to Canadian Borrower
         for the account of, third party royalty or joint interest owners."

         Section 2.3. Negative Covenants.

         (a) Section 7.3 of the Original Agreement is hereby amended in its
entirety to read as follows:

                  "Section 7.3 Limitation on Mergers. No Restricted Person will
         merge with or into or consolidate with any other Person except that:

                  (a) any Restricted Subsidiary may be merged with or into or
         consolidated with (i) Devon HoldCo, so long as Devon HoldCo is the
         surviving business entity of such merger or consolidation, (ii) US
         Borrower, so long as US Borrower is the surviving business entity of
         such merger or consolidation, or (iii) any other Subsidiary of Devon
         HoldCo, so long as the surviving business entity of such merger or
         consolidation is a Restricted Subsidiary;

                  (b) US Borrower may be merged with or into or consolidated
         with Devon HoldCo, or Devon HoldCo may be merged with or into or
         consolidated with US Borrower, so long as (i) US Borrower is the
         surviving business entity of such merger or consolidation or (ii) Devon
         HoldCo, as the surviving business entity of such merger or
         consolidation, expressly assumes, by execution of a supplement to this
         Agreement in form and substance reasonably satisfactory to US Agent,
         the due and punctual payment of all US Obligations and the performance
         of the obligations of US Borrower contained herein and in the other
         Loan Documents;

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                                    Sixth Amendment to Canadian Credit Agreement
<PAGE>

                  (c) US Borrower may merge with or into or be consolidated with
         a Subsidiary of Devon HoldCo to effect the Mitchell Restructuring Event
         so long as US Borrower is the surviving business entity of such merger
         or consolidation; and

                  (d) Any Person which is not a Restricted Person may be merged
         with or into or consolidated with a Restricted Person, so long as such
         Restricted Person is the surviving business entity of such merger or
         consolidation."

         (c) Section 7.4(a) of the Original Agreement is hereby amended in its
entirety to read as follows:

                  "(a) Neither Canadian Borrower nor any Subsidiary of Canadian
         Borrower that is a Restricted Person will issue any additional shares
         of its capital stock, additional partnership interests or other
         securities or any options, warrants or other rights to acquire such
         additional shares, partnership interests or other securities except to
         another Restricted Person which is a wholly-owned direct or indirect
         Subsidiary of Devon HoldCo unless (i) such securities are being issued
         to acquire a business, directly or indirectly through the use of the
         proceeds of such issuance, and (ii) such securities are convertible
         into the common shares or similar securities of Devon HoldCo and/or can
         be redeemed in cash at the option of the Restricted Person that issued
         such securities. In addition, (A) Canadian Borrower may issue
         "Exchangeable Shares" (as defined in the Articles of Amalgamation of
         Canadian Borrower and in this section called "Exchangeable Shares")
         upon the terms specified in the Articles of Amalgamation of Canadian
         Borrower as in effect on January 1, 2001, which terms are substantially
         the same as those set forth in the Restated Articles of Incorporation
         of Northstar Energy Corporation immediately prior to the amalgamation
         of Canadian Borrower, and (B) Canadian Borrower may issue stock options
         to its employees from time to time to acquire such Exchangeable Shares,
         provided that such options are granted under a stock option plan of
         Canadian Borrower and/or Devon HoldCo."

         (d) Section 7.6 of the Original Agreement is hereby amended by
substituting the words "Devon HoldCo" for the words "US Borrower".

         (e) Section 7.7 of the Original Agreement is hereby amended in its
entirety to read as follows:

                  "Section 7.7 Funded Debt to Total Capitalization. The ratio of
         Devon HoldCo's Consolidated Total Funded Debt to Total Capitalization
         will not exceed (i) at the end of each Fiscal Quarter prior to the
         consummation of the Anderson Financing, sixty-five percent (65%) and
         (ii) at the end of each Fiscal Quarter thereafter until and including
         June 30, 2002, seventy percent (70%) and (iii) at the end of each
         Fiscal Quarter ending after June 30, 2002 sixty-five percent (65%).

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                                    Sixth Amendment to Canadian Credit Agreement
<PAGE>

         Section 2.4. Miscellaneous. Section 10.1(a) of the Original Agreement
is hereby amended by inserting the following at the end of the fourth sentence
thereof:

                  "; provided, however, that with the consent of the Canadian
         Agent but without the separate consent of any other Lender Party,
         Canadian Borrower may amend, supplement or otherwise modify this
         Agreement or any other Canadian Loan Document in connection with the
         Mitchell Restructuring Event and the related addition of the holding
         company referred to in the definition of Mitchell Restructuring Event
         as a Restricted Person herein and in the other Canadian Loan Documents
         (i) to cure any ambiguity or correct or supplement any provision
         contained herein or in any other Canadian Loan Document which may
         thereby become defective or inconsistent with any other provisions
         contained herein or therein, so long as such amendment, supplement or
         other modification would not have an adverse effect on the interests of
         the Lender Parties hereunder and under the other Canadian Loan
         Documents or (ii) to add to the covenants and agreements of the
         Restricted Persons hereunder and thereunder such further covenants,
         agreements, restrictions, conditions or provisions as the Canadian
         Agent shall consider to be for the protection of the Lender Parties."

                                  ARTICLE III.

                           Conditions of Effectiveness

         Section 3.1. Effective Date of Amendments in Section 2.2(b), Section
2.4, and "Mitchell Restructuring Event". The amendments set forth in Section
2.2(b), Section 2.4, and the definition of "Mitchell Restructuring Event" in
Section 2.1(a) of this Amendment shall become effective as of the date first
written above when and only when:

         (a) Canadian Agent shall have received at Canadian Agent's office (i)
this Amendment executed by Canadian Borrower, Canadian Agent and Canadian
Required Lenders and (ii) a certificate of the Chairman of the Board, President,
or Vice President - Finance of Canadian Borrower dated the date of this
Amendment certifying: (A) that all of the representations and warranties set
forth in Article IV hereof are true and correct at and as of such date, and (B)
that no Default exists at and as of such date; and

         (b) Canadian Borrower shall have paid on or before such effective date
all fees and reimbursements to be paid to Canadian Agent and Canadian Lenders
pursuant to any Canadian

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<PAGE>

Loan Documents, or otherwise due Canadian Agent or Canadian Lenders and
including fees and disbursements of Canadian Agent's attorneys.

         Section 3.2. Effective Date of Entire Amendment. This Amendment (other
than the sections described in Section 3.1) shall become effective
contemporaneously with the occurrence of the Mitchell Restructuring Event on the
date the Mitchell Restructuring Event occurs; provided that the following
conditions have been satisfied:

         (a) Canadian Agent shall have received all of the following, at
Canadian Agent's office, duly executed and delivered and in form and substance
satisfactory to Canadian Agent, all of the following:

                  (i) a guaranty of the Canadian Obligations from Devon HoldCo
         in form and substance reasonably acceptable to Canadian Agent;

                  (ii) an opinion of counsel to Canadian Borrower with respect
         to this Amendment in form and substance reasonably acceptable to
         Canadian Agent;

                  (iii) a certificate of the Chairman of the Board, President,
         or Vice President - Finance of Canadian Borrower dated the date of the
         Mitchell Restructuring Event certifying: (A) that all of the
         representations and warranties set forth in Article IV hereof are true
         and correct at and as of such date, and (B) that no Default exists at
         and as of such date;

                  (iv) an opinion of counsel to Devon HoldCo with respect to the
         guaranty of Devon HoldCo referred to in clause (i) above in form and
         substance reasonably acceptable to Canadian Agent; and

                  (v) a certificate of the Senior Vice President - Finance or
         the Treasurer of Devon HoldCo dated the date of the Mitchell
         Restructuring Event with respect to its articles of incorporation,
         bylaws, incumbency, authorizing resolutions, and similar corporate
         matters.

         (b) Canadian Borrower shall have paid on or before such effective date
all fees and reimbursements to be paid to Canadian Agent and Canadian Lenders
pursuant to any Canadian Loan Documents, or otherwise due Canadian Agent or
Canadian Lenders and including fees and disbursements of Canadian Agent's
attorneys.

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                                    Sixth Amendment to Canadian Credit Agreement
<PAGE>

                                   ARTICLE IV.

                         Representations and Warranties

         Section 4.1. Representations and Warranties of Canadian Borrower. In
order to induce each Canadian Lender to enter into this Amendment, Canadian
Borrower represents and warrants to each Canadian Lender that:

         (a) The representations and warranties contained in Article V of the
Original Agreement are true and correct at and as of the time of the
effectiveness hereof, except to the extent that the facts on which such
representations and warranties are based have been changed by the extension of
credit under the Canadian Agreement.

         (b) Canadian Borrower is duly authorized to execute and deliver this
Amendment and is and will continue to be duly authorized to borrow monies and to
perform its obligations under the Canadian Agreement. Canadian Borrower has duly
taken all corporate action necessary to authorize the execution and delivery of
this Amendment and to authorize the performance of the obligations of Canadian
Borrower hereunder.

         (c) The execution and delivery by Canadian Borrower of this Amendment,
the performance by Canadian Borrower of its obligations hereunder and the
consummation of the transactions contemplated hereby do not and will not (i)
conflict with any provision of (A) any Law, (B) the organizational documents of
Canadian Borrower, or (C) any agreement, judgment, license, order or permit
applicable to or binding upon Canadian Borrower unless such conflict would not
reasonably be expected to have a Material Adverse Effect, or (ii) result in or
require the creation of any Lien upon any assets or properties of Canadian
Borrower which would reasonably be expected to have a Material Adverse Effect,
except as expressly contemplated or permitted in the Loan Documents. Except as
expressly contemplated in the Loan Documents no consent, approval, authorization
or order of, and no notice to or filing with, any Tribunal or third party is
required in connection with the execution, delivery or performance by Canadian
Borrower of this Amendment or to consummate any transactions contemplated by
this Amendment, unless failure to obtain such consent would not reasonably be
expected to have a Material Adverse Effect.

         (d) When duly executed and delivered, each of this Amendment and the
Canadian Agreement will be a legal and binding obligation of Canadian Borrower,
enforceable in accordance with its terms, except as limited by bankruptcy,
insolvency or similar laws of general application relating to the enforcement of
creditors' rights and by equitable principles of general application.

         (e) The audited annual Consolidated financial statements of US Borrower
dated as of December 31, 2000 and the unaudited quarterly Consolidated financial
statements of US Borrower dated as of June 30, 2001 fairly present the
Consolidated financial position at such dates and the Consolidated statement of
operations and the changes in Consolidated financial position for the periods
ending on such dates for US Borrower. Copies of such financial statements have
heretofore been delivered to each Canadian Lender. Since such dates no material

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                                    Sixth Amendment to Canadian Credit Agreement
<PAGE>

adverse change has occurred in the Consolidated financial condition or
businesses of US Borrower.

                                   ARTICLE V.

                                  Miscellaneous

         Section 5.1. Ratification of Agreements. The Original Agreement as
hereby amended is hereby ratified and confirmed in all respects. The Canadian
Loan Documents, as they may be amended or affected by this Amendment, are hereby
ratified and confirmed in all respects. Any reference to the Canadian Agreement
in any Loan Document shall be deemed to be a reference to the Original Agreement
as hereby amended. The execution, delivery and effectiveness of this Amendment
shall not, except as expressly provided herein, operate as a waiver of any
right, power or remedy of Canadian Lenders under the Canadian Agreement or any
other Canadian Loan Document nor constitute a waiver of any provision of the
Canadian Agreement or any other Canadian Loan Document.

         Section 5.2. Survival of Agreements. All representations, warranties,
covenants and agreements of Canadian Borrower herein shall survive the execution
and delivery of this Amendment and the performance hereof, including without
limitation the making or granting of the Loans, and shall further survive until
all of the Obligations are paid in full. All statements and agreements contained
in any certificate or instrument delivered by Canadian Borrower or any
Restricted Person hereunder or under the Canadian Agreement to any Canadian
Lender shall be deemed to constitute representations and warranties by, and/or
agreements and covenants of, Canadian Borrower under this Amendment and under
the Canadian Agreement.

         Section 5.3. Canadian Loan Documents. This Amendment is a Canadian Loan
Document, and all provisions in the Canadian Agreement pertaining to Canadian
Loan Documents apply hereto.

         Section 5.4. Governing Law. This Amendment shall be governed by and
construed in accordance the laws of the Province of Alberta and any applicable
laws of Canada in all respects, including construction, validity and
performance.

         Section 5.5. Counterparts; Fax. This Amendment may be separately
executed in counterparts and by the different parties hereto in separate
counterparts, each of which when so executed shall be deemed to constitute one
and the same Amendment. This Amendment may be validly executed by facsimile or
other electronic transmission.

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                                    Sixth Amendment to Canadian Credit Agreement
<PAGE>

         THIS AMENDMENT AND THE OTHER CANADIAN LOAN DOCUMENTS REPRESENT THE
FINAL AGREEMENT BETWEEN THE PARTIES AND MAY NOT BE CONTRADICTED BY EVIDENCE OF
PRIOR, CONTEMPORANEOUS, OR SUBSEQUENT ORAL AGREEMENTS OF THE PARTIES. THERE ARE
NO UNWRITTEN ORAL AGREEMENTS OF THE PARTIES.

            [THE REMAINDER OF THIS PAGE IS INTENTIONALLY LEFT BLANK.]

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                                    Sixth Amendment to Canadian Credit Agreement
<PAGE>

         IN WITNESS WHEREOF, this Amendment is executed as of the date first
above written.

                                       NORTHSTAR ENERGY CORPORATION
                                       Canadian Borrower

                                       By: /s/ Paul Brereton
                                          --------------------------------------
                                          Name: Paul Brereton
                                          Title: Vice President - Finance

                                       BANK OF AMERICA CANADA
                                       Administrative Agent, Canadian LC Issuer
                                       and Lender

                                       By: /s/ Nelson Lam
                                          --------------------------------------
                                          Name: Nelson Lam
                                          Title: Vice President

                                       ABN AMRO BANK CANADA
                                       Lender

                                       By: /s/ Mark Bohn
                                          --------------------------------------
                                          Name: Mark Bohn
                                          Title: Group Vice President

                                       By: /s/ Teresa Wu
                                          --------------------------------------
                                          Name: Teresa Wu
                                          Title: Vice President

                                       BANCFIRST
                                       Lender

                                       By: /s/ Arthur B. Hobbs
                                          --------------------------------------
                                          Name: Arthur B. Hobbs
                                          Title: Vice President

                                       BANK OF TOKYO - MITSUBISHI (CANADA)
                                       Lender

                                       By:
                                          --------------------------------------
                                          Name:
                                          Title:

                                    Sixth Amendment to Canadian Credit Agreement
<PAGE>

                                       BANK ONE, NA, CANADA BRANCH
                                       Lender

                                       By: /s/ Jeanie Harman
                                          --------------------------------------
                                          Name: Jeanie Harman
                                          Title: First Vice President

                                       BAYERISCHE LANDESBANK GIROZENTRALE,
                                       TORONTO BRANCH
                                       Lender

                                       By: /s/ Thomas Miller
                                          --------------------------------------
                                          Name: Thomas Miller
                                          Title: Vice President

                                       By: /s/ Bernd Erpenbeck
                                          --------------------------------------
                                          Name: Bernd Erpenbeck
                                          Title: Second Vice President

                                       CANADIAN IMPERIAL BANK OF COMMERCE
                                       Lender

                                       By: /s/ Joelle Schellenberg
                                          --------------------------------------
                                          Name: Joelle Schellenberg
                                          Title: Director

                                       By: /s/ Chris A. Perks
                                          --------------------------------------
                                          Name: Chris A. Perks
                                          Title: Executive Director

                                       CITIBANK CANADA
                                       Lender

                                       By: /s/ James K. G. Campbell
                                          --------------------------------------
                                          Name: James K. G. Campbell
                                          Title: Vice President

                                       CREDIT LYONNAIS NEW YORK BRANCH
                                       Lender

                                       By:
                                          --------------------------------------
                                          Name:
                                          Title:

                                    Sixth Amendment to Canadian Credit Agreement
<PAGE>

                                       CREDIT SUISSE FIRST BOSTON CANADA
                                       Lender

                                       By: /s/ W. M. McFarland
                                          --------------------------------------
                                          Name: W. M. McFarland
                                          Title: Vice President

                                       By: /s/ Peter Chauvin
                                          --------------------------------------
                                          Name: Peter Chauvin
                                          Title: Vice President

                                       DEUTSCHE BANK AG NEW YORK BRANCH AND/OR
                                       CAYMAN ISLANDS BRANCH
                                       Lender

                                       By: /s/ Michael E. Keating
                                          --------------------------------------
                                          Name: Michael E. Keating
                                          Title: Managing Director

                                       By: /s/ Joel Makowsky
                                          --------------------------------------
                                          Name: Joel Makowsky
                                          Title: Vice President

                                       FIRST UNION NATIONAL BANK
                                       Lender

                                       By: /s/ Robert R. Wetteroff
                                          --------------------------------------
                                          Name: Robert R. Wetteroff
                                          Title: Senior Vice President

                                       ROYAL BANK OF CANADA
                                       Lender

                                       By: /s/ Lorne Gartner
                                          --------------------------------------
                                          Name: Lorne Gartner
                                          Title: Vice President

                                       SUNTRUST BANK, ATLANTA
                                       Lender

                                       By: /s/ David J. Edge
                                          --------------------------------------
                                          Name: David J. Edge
                                          Title: Director

                                    Sixth Amendment to Canadian Credit Agreement
<PAGE>

                                       THE BANK OF NEW YORK
                                       Lender

                                       By: /s/ John V. Yancey
                                          --------------------------------------
                                          Name: John V. Yancey
                                          Title: Senior Vice President

                                       THE CHASE MANHATTAN BANK, TORONTO BRANCH
                                       Lender

                                       By: /s/ Drew McDonald
                                          --------------------------------------
                                          Name: Drew McDonald
                                          Title: Authorized Representative

                                       By: /s/ Sara Collins
                                          --------------------------------------
                                          Name: Sara Collins
                                          Title: Authorized Representative

                                       THE FUJI BANK, LIMITED
                                       Lender

                                       By: /s/ Jacques Azagury
                                          --------------------------------------
                                          Name: Jacques Azagury
                                          Title: Senior Vice President & Manager

                                       UBS AG, STAMFORD BRANCH
                                       Lender

                                       By: /s/ Patricia O'Kicki
                                          --------------------------------------
                                          Name: Patricia O'Kicki
                                          Title: Director - Banking Products
                                                 Services

                                       By: /s/ Wilfred V. Saint
                                          --------------------------------------
                                          Name: Wilfred V. Saint
                                          Title: Associate Director - Banking
                                                 Products Services, US

                                    Sixth Amendment to Canadian Credit Agreement
<PAGE>

                                       UMB BANK
                                       Lender

                                       By:
                                          --------------------------------------
                                          Name:
                                          Title:

                                       WESTDEUTSCHE LANDESBANK GIROZENTRALE
                                       Lender

                                       By:
                                          --------------------------------------
                                          Name:
                                          Title:

                                       By:
                                          --------------------------------------
                                          Name:
                                          Title:

                                    Sixth Amendment to Canadian Credit Agreement
<PAGE>

                                                                 Sixth Amendment

                              CONSENT AND AGREEMENT

         Devon Energy Corporation, a Delaware corporation ("Canadian
Guarantor"), hereby (i) consents to the provisions of this Amendment and the
transactions contemplated herein, (ii) ratifies and confirms the Guaranty dated
as of August 29, 2000 (the "Parent Guaranty") made by it for the benefit of
Canadian Agent and Lenders executed pursuant to the Canadian Agreement and the
other Canadian Loan Documents, (iii) agrees that all of its respective
obligations and covenants thereunder shall remain unimpaired by the execution
and delivery of this Amendment and the other documents and instruments executed
in connection herewith, and (iv) agrees that the Parent Guaranty and such other
Canadian Loan Documents shall remain in full force and effect.

                                       DEVON ENERGY CORPORATION

                                       By: /s/ Dale T. Wilson
                                          --------------------------------------
                                          Name: Dale T. Wilson
                                          Title: Treasurer

         Devon Financing Corporation, U.L.C., a Nova Scotia unlimited liability
company, hereby (i) consents to the provisions of this Amendment and the
transactions contemplated herein, (ii) ratifies and confirms the Guaranty dated
as of October 3, 2001 (the "DFC Guaranty") made by it for the benefit of
Canadian Agent and Lenders executed pursuant to the Canadian Agreement and the
other Canadian Loan Documents, (iii) agrees that all of its respective
obligations and covenants thereunder shall remain unimpaired by the execution
and delivery of this Amendment and the other documents and instruments executed
in connection herewith, and (iv) agrees that the DFC Guaranty and such other
Canadian Loan Documents shall remain in full force and effect.

                                       DEVON FINANCING CORPORATION, U.L.C.

                                       By: /s/ Dale T. Wilson
                                          --------------------------------------
                                          Name: Dale T. Wilson
                                          Title: Treasurer

                                    Sixth Amendment to Canadian Credit Agreement<PAGE>

                                                                     EXHIBIT 4.1

                                  U.S. BANCORP

        Up To $592,784,000 7.35% Junior Subordinated Debentures due 2031

                         Officers' Certificate Pursuant
                         to Section 3.1 of the Indenture

     Pursuant to authority expressly delegated by the Board of Directors of U.S.
Bancorp (the "Company") by resolutions duly adopted by the Board of Directors,
and pursuant to the Indenture referred to below, there is hereby established a
series of Securities (as that term is defined in the Indenture) pursuant to
Section 3.1 of the Junior Subordinated Indenture, dated as of November 15, 1996,
between the Company and Wilmington Trust Company, as Trustee (the "Indenture"),
the terms of which shall be as follows (capitalized terms not defined herein
shall have the meanings assigned to them in the Indenture):

          (1) The Securities of this series shall be known and designated as the
     "7.35% Junior Subordinated Debentures due 2031" of the Company (the
     "Debentures"). The Debentures initially shall be issued to USB Capital IV,
     a Delaware statutory business trust (the "Trust"). The Trust Agreement for
     the Trust shall be the Amended and Restated Trust Agreement, dated as of
     November 1, 2001, among the Company, as Sponsor, First Union Trust Company,
     National Association, as Property Trustee, First Union Trust Company,
     National Association, as Delaware Trustee, and the Administrative Trustees
     named therein (the "Trust Agreement"). The Guarantee will be issued
     pursuant to the Guarantee Agreement, dated as of November 1, 2001, between
     the Company and First Union Trust Company, National Association, as
     Guarantee Trustee.

          (2) The aggregate principal amount of Debentures which may be
     authenticated and delivered under the Indenture is $592,784,000 (except for
     Debentures authenticated and delivered upon registration of transfer of, or
     exchange for, or in lieu of, other Debentures pursuant to Section 3.4, 3.5,
     3.6, 9.6 or 11.6 of the Indenture).

          (3) The Debentures will be issued only in fully registered form and
     the authorized minimum denomination of the Debentures shall be $25 and any
     integral multiple of $25 in excess thereof.

          (4) The principal amount of the Debentures shall be payable in full on
     November 1, 2031 subject to and in accordance with the provisions of the
     Indenture.

          (5) The rate at which the Debentures shall bear interest will be 7.35%
     per annum; the date from which such interest shall accrue is November 1,
     2001; the Interest Payment Dates (as defined in the Indenture) on which
     such interest shall be payable are February 1, May 1, August 1 and November
     1 of each year, commencing February 1, 2002; and the Regular Record Dates
     (as defined in the Indenture) for the interest payable on any Interest
     Payment Date will be the business day preceding each Interest Payment Date,
     provided, however, in the event the Debentures are distributed to the
     holders of the Capital Securities (as defined below) of the Trust, the
     Regular Record Date for the Debentures shall be (i) in the case the
     Debentures are represented by one or more global securities, the business
     day next preceding such Interest Payment Date and (ii) in the case the

<PAGE>

     Debentures are not represented by one or more global securities, the date
     which is fifteen days next preceding such Interest Payment Date (whether or
     not a business day). The amount of interest payable for any period will be
     computed on the basis of a 360-day year comprised of twelve 30-day months.
     The amount of interest payable for any period shorter than a full quarterly
     period will be computed on the basis of a 30-day month and, for periods of
     less than a month, the actual number of days elapsed per 30-day month.

          (6) Interest will be payable to the person in whose name a Debenture
     (or one or more Predecessor Debentures) is registered at the close of
     business on the Regular Record Date next preceding the Interest Payment
     Date, except that, interest payable on the Stated Maturity of the principal
     of a Debenture shall be paid to the Person to whom principal is paid.

          (7) Interest on the Debentures shall be subject to deferral to the
     extent and in the manner provided in Section 3.11 of the Indenture at any
     one time or from time to time for a period not exceeding twenty (20)
     consecutive quarterly periods.

          (8) Payment of the principal of (and premium, if any) and interest on
     the Debentures will be made at the corporate trust office of Wilmington
     Trust Company in the City of New York, New York, in such coin or currency
     of the United States of America as at the time of payment is legal tender
     for payment of public and private debts; provided, however, that at the
     option of the Company payment of interest may be made (i) by check mailed
     to the address of the Person entitled thereto as such address shall appear
     in the Securities Register or (ii) by wire transfer in immediately
     available funds at such place and to such account as may be designated by
     the Person entitled thereto as specified in the Securities Register. The
     office where Debentures may be presented or surrendered for payment and the
     office where Debentures may be surrendered for transfer or exchange and
     where notices and demands to or upon the Company in respect of the
     Debentures and the Indenture may be served shall be the corporate trust
     office of Wilmington Trust Company in the City of New York, New York. The
     Trustee shall act as Paying Agent.

          (9) The Debentures are redeemable at the option of the Company,
     subject to the terms and conditions of Article XI of the Indenture, at 100%
     of their principal amount plus accrued and unpaid interest:

          o    in whole or in part, on one or more occasions at any time on or
               after November 1, 2006 or

          o    in whole at any time if certain changes occur in tax or
               investment company laws and regulations, or in the treatment of
               the Trust's 7.35% Trust Preferred Securities (the "Capital
               Securities") for bank regulatory capital purposes (each such
               event, a "Special Event").

          If a Special Event has occurred and is continuing, and the Company
     cannot cure that event by some reasonable action, then the Company may
     redeem the Debentures within 90 days following the occurrence of the
     Special Event. A "Special Event" means the occurrence of a "Tax Event", a
     "Regulatory Capital Event" or an "Investment Company Event".

<PAGE>

          "Tax Event" means the receipt by the Company or the Trust of an
     opinion of tax counsel (which may be the Company's counsel or counsel of an
     Affiliate but not an employee and must be reasonably acceptable to the
     Property Trustee under the Trust) experienced in such matters, to the
     effect that, as a result of:

          o    any amendment to, or change (including any announced prospective
               change) in, the laws (or any regulations thereunder) of the
               United States or any political subdivision or taxing authority
               thereof or therein; or

          o    any court, governmental agency or regulatory authority
               interpreting or applying such laws or regulations,

     there is more than an insubstantial risk that:

          o    the Trust is, or will be within 90 days of the date of such
               opinion, subject to United States federal income tax with respect
               to income received or accrued on the Debentures;

          o    interest payable by the Company on the Debentures is not, or
               within 90 days of the date of such opinion will not be,
               deductible, in whole or in part, by the Company, for United
               States federal income tax purposes; or

          o    the Trust is, or will be within 90 days of the date of such
               opinion, subject to more than a de minimis amount of other taxes,
               duties or other governmental charges.

          "Regulatory Capital Event" means the reasonable determination by the
     Company that, as a result of:

          o    any amendment to, or change (including any announced prospective
               change) in, the laws (or any regulations thereunder) of the
               United States; or

          o    any official or administrative pronouncement or action or
               judicial decision for interpreting or applying such laws or
               regulations,

     which amendment or change is effective or pronouncement or decision is
     announced on or after the date of original issuance of the Capital
     Securities, there is more than an insubstantial risk of impairment of the
     Company's ability to treat the Capital Securities (or any substantial
     portion thereof) as Tier 1 capital (or its then equivalent) for purposes of
     the capital adequacy guidelines of the Federal Reserve in effect and
     applicable to the Company.

          "Investment Company Event" means the receipt by the Company and the
     Trust of an opinion of an independent counsel experienced in matters
     relating to investment companies, to the effect that, as a result of the
     occurrence of:

<PAGE>

          o    a change in law or regulation; or

          o    a change in interpretation or application of law or regulation by
               any legislative body, court, governmental agency or regulatory
               authority (a "Change in 1940 Act Law"),

     there is more than an insubstantial risk that the Trust is or will be
     considered an "investment company" that is required to be registered under
     the Investment Company Act of 1940, which Change in 1940 Act Law becomes
     effective on or after the date of original issuance of the Capital
     Securities.

          (10) The Debentures shall not be subject to any sinking fund or
     analogous provisions.

          (11) The Debentures shall be substantially in the form of Annex A
     attached hereto, with such modifications thereto as may be approved by the
     authorized officer executing the same. The Trust Agreement shall be
     substantially in the form of Annex B attached hereto, with such
     modifications thereto as may be approved by the authorized officer
     executing the same. The Guarantee Agreement shall be substantially in the
     form of Annex C attached hereto, with such modifications thereto as may be
     approved by the authorized officer executing the same.

          (12) The subordination provisions of Article XIII of the Indenture
     shall apply.

          (13) With respect to the Debentures, the following amendments to the
     Indenture shall apply:

               (a) The following language shall be added to the end of the
          definitions of "Senior and Subordinated Debt":

               "or any obligations in respect of debt securities issued to any
               trust, or a trustee of such trust, partnership or other entity
               affiliated with the Company that is a financing entity of the
               Company in connection with the issuance by such financing entity
               of securities that are similar to the Capital Securities."

               (b) The following language shall be added to the end of Section
          10.6:

               "The Company, in its capacity as issuer, also covenants to pay
               all debts and obligations (other than with respect to the Capital
               and Common Securities) and all costs and expenses of each Trust
               and to pay any and all taxes, duties, assessments or governmental
               charges of whatever nature (other than withholding taxes) imposed
               on the Trust by the United States or any other taxing authority,
               so that the net amounts received and retained by the Trust and
               the Property Trustee after paying such amounts will be equal to
               the amounts the Trust and the Property Trustee would have
               received had no such amounts been incurred or imposed on the
               Trust. The obligations of the Company to pay such amounts shall
               constitute additional indebtedness and shall survive the
               satisfaction and discharge of this Indenture."

<PAGE>

     IN WITNESS WHEREOF, the undersigned have executed this Officers'
Certificate as of the 1st day of November, 2001.

                                       By:
                                           ------------------------------------
                                           Name:
                                           Title:

                                       By:
                                           -------------------------------------
                                           Name:
                                           Title:

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