Document:

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                                                                    EXHIBIT 10.7

                     SIXTH AMENDMENT TO US CREDIT AGREEMENT

         THIS SIXTH AMENDMENT TO US CREDIT AGREEMENT (herein called this
"Amendment") made as of October 5, 2001, by and among Devon Energy Corporation,
a Delaware corporation ("US Borrower"), Bank of America, N.A., individually and
as administrative agent ("US Agent"), and the US Lenders party to the Original
Agreement defined below ("US Lenders").

                                   WITNESSETH:

         WHEREAS, US Borrower, US Agent and US Lenders entered into that certain
US 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 US Lenders became obligated to make
loans to US Borrower as therein provided;

         WHEREAS, US Borrower, US Agent and US 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 US Lenders to US
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.

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

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

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                  "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.

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

                                   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 of 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", "Total Capitalization" and "US GAAP" in Annex
I to the Original Agreement are hereby amended in their entirety to read as
follows:

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                  "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.

                  "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

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         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. Representations and Warranties.

         (a) Section 5.2 and the first sentence of Section 5.3 of the Original
Agreement are hereby amended by substituting the words "Devon HoldCo, US
Borrower" for the words "US Borrower" each place where such words appear
therein.

         (b) Section 5.10 of the Original Agreement is hereby amended by
substituting the word "Devon HoldCo" for the words "US Borrower" each place
where such words appear therein and by deleting the period at the end of the
first sentence thereof and adding the words "and US Borrower and Mitchell and
its Subsidiaries." in place thereof.

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         Section 2.3. 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:

                  "Section 6.13 Bank Accounts; Offset. US Borrower hereby agrees
         that each US 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 US
         Borrower now or hereafter held or received by or in transit to any US
         Lender for the account of US Borrower, (b) any and all deposits
         (general or special, time or demand, provisional or final) of US
         Borrower with any US Lender, (c) any other credits and balances of US
         Borrower at any time existing against any US Lender, including claims
         under certificates of deposit, and (d) any indebtedness owed or payable
         by any Lender to US Borrower at any time against US 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 US
         Obligations then due and payable to it (in either case without notice
         to US Borrower), any and all items hereinabove referred to. To the
         extent that US 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 US Borrower for the account of, third party royalty or
         joint interest owners."

         Section 2.4. Negative Covenants.

         (a) Section 7.1(m) of the Original Agreement is hereby amended in its
entirety to read as follows:

                  "(m) (1) Indebtedness in an aggregate principal amount not to
         exceed US $4,300,000,000 owed by Devon Financing Corporation, U.L.C., a
         Nova Scotia unlimited liability company and wholly-owned Subsidiary of
         US Borrower, and (2) other Indebtedness of such Nova Scotia unlimited
         liability company with respect to guaranties of Indebtedness of US
         Borrower or the holding company referred to in the definition of
         Mitchell Restructuring Event, to the extent US Borrower is in
         compliance with the terms of Section 7.8 at the time such guaranties
         are executed and delivered."

         (b) 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:

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                  (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;

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

                  "Section 7.4 Limitation on Issuance of Securities by US
         Borrower and Restricted Subsidiaries; Ownership of certain Restricted
         Subsidiaries by US Borrower.

                  (a) No Restricted Subsidiary 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 or similar securities of Devon HoldCo and/or may 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, (B) Canadian Borrower may issue stock options to
         its employees from time to time to acquire such Exchangeable Shares,
         provided

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         that such options are granted under a stock option plan of Canadian
         Borrower and/or Devon HoldCo, and (C) Devon Trust may issue common
         securities to US Borrower or Devon HoldCo and the Devon Trust
         Securities.

                  (b) US Borrower will at all times own, directly or indirectly,
         100% of the partnership interests in Devon Energy Production Company,
         L.P., 100% of the outstanding shares of common stock of Devon SFS and
         Northstar Energy, and 100% of the outstanding common securities of
         Devon Trust. Devon HoldCo will at all times own directly 100% of the
         outstanding capital stock of US Borrower having ordinary voting power
         (disregarding changes in voting power based on the occurrence of
         contingencies) for the election of directors."

         (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 Prohibited Contracts. Except as expressly
         provided for in the US Loan Documents, the Support Agreement dated
         December 10, 1998 between the US Borrower and Northstar Energy, the
         Santa Fe Snyder Indentures, and documents and instruments evidencing or
         governing Acquired Debt, no Restricted Person will, directly or
         indirectly, enter into, create, or otherwise allow to exist any
         contract or other consensual restriction on the ability of (i) any
         Restricted Person that is a Subsidiary of US Borrower to pay dividends
         or make other distributions to US Borrower, to redeem equity interests
         held in it by US Borrower, to repay loans and other indebtedness owing
         by it to US Borrower, or to transfer any of its assets to US Borrower
         or (ii) any Restricted Person that is a Subsidiary of Devon HoldCo
         (other than US Borrower and its Subsidiaries) to pay dividends or make
         other distributions to Devon HoldCo, to redeem equity interests held in
         it by Devon HoldCo, to repay loans and other indebtedness owing by it
         to Devon HoldCo or US Borrower, or to transfer any of its assets to
         Devon HoldCo."

         (f) Section 7.8 of the Original Agreement is hereby amended in its
entirety to read as follows:

                  "Section 7.8 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%)."

         (g) Section 7.9 of the Original Agreement is hereby amended by
substituting the words "US Borrower or Devon HoldCo" for the words "US Borrower"
except where "US Borrower" is part of another defined term.

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         Section 2.5. 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 US Agent
         but without the separate consent of any other Lender Party, US Borrower
         may amend, supplement or otherwise modify this Agreement or any other
         US 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 US Loan Documents (i) to cure any ambiguity or
         correct or supplement any provision contained herein or in any other US
         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 US 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 US
         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 2.3(b), Section
2.4(a), Section 2.5, and "Mitchell Restructuring Event". The amendments set
forth in Section 2.3(b), Section 2.4(a), Section 2.5, 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) US Agent shall have received at US Agent's office (i) this
Amendment executed by US Borrower, US Agent and US Required Lenders and (ii) a
certificate of the Senior Vice President - Finance or the Treasurer of US
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) US Borrower shall have paid on or before such effective date all
fees and reimbursements to be paid to US Agent and US Lenders pursuant to any US
Loan Documents, or otherwise due US Agent or US Lenders and including fees and
disbursements of US 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) US Agent shall have received all of the following, at US Agent's
office, duly executed and delivered and in form and substance satisfactory to US
Agent, all of the following:

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

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

                  (iii) a certificate of the Senior Vice President - Finance or
         the Treasurer of US 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 reasonable acceptable to US 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) US Borrower shall have paid on or before such effective date all
fees and reimbursements to be paid to US Agent and US Lenders pursuant to any US
Loan Documents, or otherwise due US Agent or US Lenders and including fees and
disbursements of US Agent's attorneys.

                                   ARTICLE IV.

                         Representations and Warranties

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

         (b) US 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 US Agreement. US 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 US Borrower
hereunder.

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         (c) The execution and delivery by US Borrower of this Amendment, the
performance by US 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 US Borrower, or
(C) any agreement, judgment, license, order or permit applicable to or binding
upon US 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 US 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 US 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 US
Agreement will be a legal and binding obligation of US 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 US Lender. Since such dates no material
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 US Loan
Documents, as they may be amended or affected by this Amendment, are hereby
ratified and confirmed in all respects. Any reference to the US 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 US Lenders under the US Agreement or any other US Loan
Document nor constitute a waiver of any provision of the US Agreement or any
other US Loan Document.

         Section 5.2. Survival of Agreements. All representations, warranties,
covenants and agreements of US 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

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shall further survive until all of the Obligations are paid in full. All
statements and agreements contained in any certificate or instrument delivered
by US Borrower or any Restricted Person hereunder or under the US Agreement to
any US Lender shall be deemed to constitute representations and warranties by,
and/or agreements and covenants of, US Borrower under this Amendment and under
the US Agreement.

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

         Section 5.4. Governing Law. This Amendment shall be governed by and
construed in accordance the laws of the State of Texas and any applicable laws
of the United States of America 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.

         Section 5.6 Renumbering of Funded Debt to Total Capitalization
Covenant. The reference to Section 7.7 of the Original Agreement contained in
the Fifth Amendment to US Credit Agreement was intended to refer to Section 7.8
of the Original Agreement and is hereby renumbered as Section 7.8 of the
Original Agreement.

         THIS AMENDMENT AND THE OTHER US 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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         IN WITNESS WHEREOF, this Amendment is executed as of the date first
above written.

                                       DEVON ENERGY CORPORATION
                                       US Borrower

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

                                       BANK OF AMERICA, N.A.,
                                       Administrative Agent, US LC Issuer
                                       and Lender

                                       By: /s/  James R. Allred
                                          --------------------------------
                                          Name:   James R. Allred
                                          Title:  Managing Director

                                       ABN AMRO BANK, N.V.
                                       Lender

                                       By: /s/  James Conn
                                          --------------------------------
                                          Name:   Jamie Conn
                                          Title:  Group Vice President

                                       By: /s/  Frank R. Russo, Jr.
                                          --------------------------------
                                          Name:   Frank R. Russo, Jr.
                                          Title:  Group Vice President

                                       BANCFIRST
                                       Lender

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

                                          Sixth Amendment to US Credit Agreement

<PAGE>

                                       BANK OF MONTREAL
                                       Lender

                                       By: /s/  James B. Whitmore
                                          ------------------------------------
                                          Name:    James B. Whitmore
                                          Title:   Managing Director

                                       BANK ONE, NA (MAIN OFFICE - CHICAGO)
                                       Lender

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

                                       BAYERISCHE LANDESBANK
                                       GIROZENTRALE, CAYMAN ISLANDS
                                       BRANCH Lender

                                       By: /s/  Peter Obermann
                                          ------------------------------------
                                          Name:    Peter Obermann
                                          Title:   Senior Vice President

                                       By: /s/  James H. Boyle
                                          ------------------------------------
                                          Name:    James H. Boyle
                                          Title:   Vice President

                                       CIBC INC.
                                       Lender

                                       By: /s/  Nora Q. Catiis
                                          ------------------------------------
                                          Name:    Nora Q. Catiis
                                          Title:   Authorized Signatory

                                       CITIBANK, N.A.
                                       Lender

                                       By: /s/  Todd J. Mogil
                                          ------------------------------------
                                          Name:    Todd J.Mogil
                                          Title:   Attorney-in-fact

                                          Sixth Amendment to US Credit Agreement

<PAGE>

                                       CREDIT LYONNAIS NEW YORK
                                       BRANCH
                                       Lender

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

                                       CREDIT SUISSE FIRST BOSTON
                                       Lender

                                       By:  /s/  James P. Moran
                                          -------------------------------
                                          Name:    James P. Moran
                                          Title:   Director

                                       By:  /s/  Paul L. Colon
                                          -------------------------------
                                          Name:    Paul L.Colon
                                          Title:   Vice President

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

                                       By:  /s/  Michael E. Keating
                                          -------------------------------
                                          Name:    Michael A. 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

                                          Sixth Amendment to US Credit Agreement

<PAGE>

                                  ROYAL BANK OF CANADA
                                  Lender

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

                                  SUNTRUST BANK, ATLANTA
                                  Lender

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

                                  THE BANK OF NEW YORK
                                  Lender

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

                                  THE BANK OF TOKYO - MITSUBISHI
                                  LTD. HOUSTON AGENCY
                                  Lender

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

                                  THE CHASE MANHATTAN BANK
                                  Lender

                                  By:  /s/  Russell A. Johnson
                                     ---------------------------------------
                                     Name:   Russell A. Johnson
                                     Title:  Vice President

                                  THE FUJI BANK, LIMITED
                                  Lender

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

                                          Sixth Amendment to US Credit Agreement

<PAGE>

                                  TORONTO-DOMINION (TEXAS), INC.
                                  Lender

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

                                  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

                                  UMB BANK
                                  Lender

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

                                  WESTDEUTSCHE LANDESBANK
                                  GIROZENTRALE
                                  Lender

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

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

                                          Sixth Amendment to US Credit Agreement

<PAGE>

                                                                 Sixth Amendment

                              CONSENT AND AGREEMENT

         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 US
Agent and Lenders executed pursuant to the US Agreement and the other US 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 US 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 US Credit Agreement<PAGE>
                                                                    EXHIBIT 10.8

                  THIRD AMENDMENT TO CANADIAN CREDIT AGREEMENT

         THIS THIRD AMENDMENT TO CANADIAN CREDIT AGREEMENT (herein called this
"Amendment") made as of July 31, 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 Borrowers, 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, on January 1, 2001 Northstar Energy, Devon Energy Canada
Holding Corporation (the successor by amalgamation to Devon Energy Canada) and
certain other Alberta corporations, all of which were Subsidiaries of US
Borrower, amalgamated under the name Northstar Energy Corporation (defined above
as the "Canadian Borrower") which is now the sole Canadian Borrower;

         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.

                                    Third Amendment to Canadian Credit Agreement
<PAGE>

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

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

                                   ARTICLE II.

                        Amendments to Original Agreement

         Section 2.1. Defined Terms.

         (a) The definition of "ERISA Plan" in Annex I of the Original Agreement
is hereby amended in its entirety to read as follows:

                  "'ERISA Plan' means any employee pension benefit plan (other
         than a Multiemployer Plan) subject to Title IV of ERISA maintained by
         any ERISA Affiliate with respect to which any Restricted Person has a
         fixed or contingent liability."

         (b) The definition of "Permitted Liens" in Annex I of the Original
Agreement is hereby amended by deleting subsection (w) thereof and adding the
following new subsections (w) and (x) in lieu thereof:

                  "(w) Liens on Margin Stock.

                  (x) in addition to Liens permitted by clauses (a) through (w)
         above, Liens on property or assets if the aggregate Indebtedness
         secured thereby does not exceed US $50,000,000."

         (c) The definition of "Stamping Fee Rate" in Annex I of the Original
Agreement is hereby amended in its entirety to read as follows:

                  "`Stamping Fee Rate' means with respect to any Bankers'
         Acceptance accepted by any Canadian Resident Lender at any time, the
         Applicable Margin then in effect.

         (d) The definition of "Termination Event" in Annex I of the Original
Agreement is hereby amended in its entirety to read as follows:

                  "'Termination Event' means (a) the occurrence with respect to
         any ERISA Plan of (i) a reportable event described in Sections
         4043(c)(5) or (6) of ERISA or (ii) any other reportable event described
         in Section 4043(c) of ERISA other than a reportable event not subject
         to the provision for 30-day notice to the Pension Benefit Guaranty
         Corporation pursuant to a waiver by such corporation under Section
         4043(a) of ERISA; or (b) the withdrawal of any ERISA Affiliate from an
         ERISA Plan during a plan year in which it was

                                       2

                                    Third Amendment to Canadian Credit Agreement
<PAGE>

         a "substantial employer" as defined in Section 4001(a)(2) of ERISA; or
         (c) a complete or partial withdrawal by any ERISA Affiliate from a
         Multiemployer Plan or notification that a Multiemployer Plan is in
         reorganization; or (d) the filing of a notice of intent to terminate
         any ERISA Plan or Multiemployer Plan or the treatment of any ERISA Plan
         amendment or Multiemployer Plan amendment as a termination under
         Section 4041 or 4041A of ERISA; or (e) the institution of proceedings
         to terminate any ERISA Plan or Multiemployer Plan by the Pension
         Benefit Guaranty Corporation under Section 4042 of ERISA; or (f) any
         other event or condition which might constitute grounds under Section
         4042 of ERISA for the termination of, or the appointment of a trustee
         to administer, any ERISA Plan or Multiemployer Plan."

         (e) The definition of "Total Capitalization" in Annex I of the Original
Agreement is hereby amended in its entirety to read as follows:

                  "'Total Capitalization' means the sum (without duplication) of
         (i) US Borrower's Consolidated Total Funded Debt plus (ii) US
         Borrower'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."

         (f) The first sentence of the definition of "Unrestricted Subsidiary"
in Annex I of the Original Agreement is hereby amended in its entirety to read
as follows (it being understood that the last sentence thereof and the list of
Unrestricted Subsidiaries set forth therein are not being modified by this
Amendment):

                  "'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, 2000, which
         thereafter became a Subsidiary of US Borrower and which, within 90 days
         after becoming a Subsidiary of US Borrower, is 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."

         (g) The following defined terms are hereby added to Annex I of the
Original Agreement in alphabetical order:

                  "'Disclosure Report' means a written notice given by US
         Borrower to all Lender Parties or a certificate given by the Senior
         Vice President-Finance or the Treasurer of US Borrower under Sections
         6.2(a) and (b)."

                                       3

                                    Third Amendment to Canadian Credit Agreement
<PAGE>

                  "'Multiemployer Plan' means a multiemployer plan within the
         meaning of Section 4001(a)(3) of ERISA to which any ERISA Affiliate is
         making or is obligated to make contributions or, during the five
         preceding plan years, has made or has been obligated to make
         contributions."

                  "'Margin Stock' means 'margin stock' as defined in Reg U."

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

                  "'Reg U' means Regulation U promulgated by the Board of
         Governors of the Federal Reserve System."

         Section 2.2. Default Rate. Section 1.5(a)(vi) of the Original Agreement
is hereby amended in its entirety to read as follows:

                  "(vi) All past due principal of and past due interest on the
         Canadian Loans shall bear interest on each day outstanding at the
         applicable Default Rate in effect on such day, and such interest shall
         be due and payable daily as it accrues."

         Section 2.3. Use of Proceeds. Section 1.10 of the Original Agreement is
hereby amended in its entirety to read as follows:

                  "Section 1.10. Use of Proceeds. Canadian Borrower shall use
         all Canadian Advances and Canadian Swing Loans made under this
         Agreement to refinance existing indebtedness (including any commercial
         paper issued by or for the account of Canadian Borrower), to finance
         capital expenditures, to refinance Matured Canadian LC Obligations
         outstanding under this Agreement, and to provide working capital for
         its operations and for other general business purposes. Canadian
         Borrower shall use all Letters of Credit for its general corporate
         purposes. If any Canadian Advance or Canadian Swing Loan is used for a
         purpose which is governed by Reg U, Canadian Borrower shall comply with
         Reg U in all respects. Canadian Borrower represents and warrants that
         Canadian Borrower is not engaged principally, or as one of Canadian
         Borrower's important activities, in the business of extending credit to
         others for the purpose of purchasing or carrying Margin Stock."

         Section 2.4. Conditions Precedent. Section 4.3(c) of the Original
Agreement is hereby deleted.

         Section 2.5. Representations and Warranties; Litigation. Sections 5.2
and 5.7 of the Original Agreement are hereby amended in their entirety to read
as follows:

                  "Section 5.2 Organization and Good Standing. Each of Canadian
         Borrower and the

                                       4

                                    Third Amendment to Canadian Credit Agreement
<PAGE>

         Material Subsidiaries of Canadian Borrower is duly organized, validly
         existing and in good standing under the Laws of its jurisdiction of
         organization, having all powers required to carry on its business and
         enter into and carry out the transactions contemplated hereby. Each of
         Canadian Borrower and the Material Subsidiaries of Canadian Borrower is
         duly qualified, in good standing, and authorized to do business in all
         other jurisdictions within Canada wherein the character of the
         properties owned or held by it or the nature of the business transacted
         by it makes such qualification necessary except where failure to so
         qualify would not have a Material Adverse Effect. Each of Canadian
         Borrower and the Material Subsidiaries of Canadian Borrower has taken
         all actions and procedures customarily taken in order to enter, for the
         purpose of conducting business or owning property, each jurisdiction
         outside Canada wherein the character of the properties owned or held by
         it or the nature of the business transacted by it makes such actions
         and procedures desirable except where failure to so qualify would not
         have a Material Adverse Effect.

                  Section 5.7. Litigation. Except as disclosed in the Initial
         Financial Statements, in the financial statements delivered to each
         Lender Party pursuant to Section 6.2, in the Disclosure Schedule or in
         a Disclosure Report, there are no actions, suits or legal, equitable,
         arbitrative or administrative proceedings pending, or to the knowledge
         of Canadian Borrower threatened, against Canadian Borrower or any
         Subsidiary of Canadian Borrower that is a Restricted Person before any
         Tribunal which would reasonably be expected to have a Material Adverse
         Effect, and there are no outstanding judgments, injunctions, writs,
         rulings or orders by any such Tribunal against any such Person which
         would reasonably be expected to have a Material Adverse Effect."

         Section 2.6. Representations and Warranties; Names and Places of
Business. Section 5.9 of the Original Agreement is hereby deleted in its
entirety.

         Section 2.7. Representations and Warranties; Canadian Borrower's
Subsidiaries; Title to Properties; Licenses. Sections 5.10 and 5.11 of the
Original Agreement are hereby amended in their entirety to read as follows:

                  "Section 5.10. Canadian Borrower's Subsidiaries. Canadian
         Borrower does not presently have any Material Subsidiary except those
         listed in the Disclosure Schedule or in a Disclosure Report (it being
         understood that inclusion of a Subsidiary on the Disclosure Schedule
         does not mean that such Subsidiary is a Material Subsidiary). Canadian
         Borrower owns, directly or indirectly, the equity interest in each of
         its Material Subsidiaries which is indicated in the Disclosure Schedule
         or in a Disclosure Report.

                  Section 5.11. Title to Properties; Licenses. Canadian Borrower
         and each Subsidiary of Canadian Borrower that is a Restricted Person
         has good and defensible title to all of its material properties and
         assets, free and clear of all Liens other than Permitted Liens and of
         all impediments to the use of such properties and assets in such
         Restricted Person's business except to the extent failure to have such
         title would not have a Material Adverse Effect. Canadian Borrower and
         each Subsidiary of Canadian Borrower that is a

                                       5

                                    Third Amendment to Canadian Credit Agreement
<PAGE>

         Restricted Person possesses all licenses, permits, franchises, patents,
         copyrights, trademarks and trade names, and other intellectual property
         (or otherwise possesses the right to use such intellectual property)
         which are necessary to carry out its business as presently conducted
         and as presently proposed to be conducted hereafter except to the
         extent failure to possess such licenses, permits, franchises, and
         intellectual property would not have a Material Adverse Effect, and no
         such Restricted Person is in violation in any material respect of the
         terms under which it possesses such intellectual property or the right
         to use such intellectual property except to the extent any such
         violation would not have a Material Adverse Effect."

         Section 2.8. Notice of Material Events and Change of Address. Section
6.4 of the Original Agreement is hereby amended to replace all references
therein to the amount of "$100,000,000" to "$125,000,000", to delete the last
sentence of such section, and to amend clause (d) thereof in its entirety to
read as follows:

                  "(d) the occurrence of any Termination Event which could
         reasonably be expected to cause (i) the total amount of withdrawal
         liability that would be incurred by all ERISA Affiliates upon their
         complete withdrawal from all Multiemployer Plans to exceed US
         $125,000,000, or (ii) the aggregate Liabilities of the ERISA Affiliates
         to ERISA Plans to exceed $125,000,000."

         Section 2.9. Environmental Matters. Section 6.12(b) of the Original
Agreement is hereby amended to replace the reference therein to the amount of
"$100,000,000" to "$125,000,000."

         Section 2.10. Indebtedness. Subsections (b) and (l) of Section 7.1 of
the Original Agreement are hereby amended in their entirety to read as follows:

                  "(b) capital lease obligations (excluding oil, gas or mineral
         leases) entered into in the ordinary course of such Restricted Person's
         business in arm's length transactions at competitive market rates under
         competitive terms and conditions in all respects, provided that such
         capital lease obligations required to be paid in any Fiscal Year do not
         in the aggregate exceed US $50,000,000 for all Restricted Subsidiaries,
         whether or not Subsidiaries of Canadian Borrower.

                  (l) miscellaneous items of Indebtedness of all Restricted
         Persons (other than US Borrower) not described in subsections (a)
         through (k) which do not in the aggregate exceed US $400,000,000 in
         principal amount at any one time outstanding."

         Section 2.11. Limitation on Restricted Payments. Section 7.5 of the
Original Agreement is hereby deleted.

         Section 2.12. Events of Default. Subsection (c) and (e) of Section 8.1
of the Original Agreement are hereby amended in their entirety to read as
follows:

                                       6

                                    Third Amendment to Canadian Credit Agreement
<PAGE>

                  "(c) Any Restricted Person fails (other than as referred to in
         subsections (a) or (b) above) to (i) duly comply with Section 1.10 or
         Section 7.4(b) of the Canadian Agreement or (ii) duly observe, perform
         or comply with any other covenant, agreement, condition or provision of
         any Canadian Loan Document, and such failure remains unremedied for a
         period of thirty (30) days after notice of such failure is given by
         Canadian Agent to Canadian Borrower;

                  (e) Any Restricted Person fails to duly pay any Indebtedness
         in excess of US $125,000,000 constituting principal or interest owed by
         it with respect to borrowed money or money otherwise owed under any
         note, bond, or similar instrument, or (ii) breaches or defaults in the
         performance of any agreement or instrument by which any such
         Indebtedness is issued, evidenced, governed, or secured, other than a
         breach or default described in clause (i) above, and any such failure,
         breach or default results in the acceleration of such Indebtedness;
         provided that notwithstanding any provision of this subsection (e) to
         the contrary, to the extent that the terms of any such agreement or
         instrument governing the sale, pledge or disposal of Margin Stock or
         utilization of the proceeds of such Indebtedness in connection
         therewith would result in such acceleration and in a Default or an
         Event of Default under this Agreement, and would cause this Agreement
         or any Canadian Loan to be subject to the margin requirements or any
         other restriction under Reg U, then such acceleration shall not
         constitute a Default or Event of Default under this subsection (e);"

         Section 2.13. Additional Events of Default. Section 8.1(h) is hereby
amended by replacing all references therein to the amount of "$100,000,000" to
"$125,000,000."

         Section 2.14. Amendments to Statutes and Regulations. Section 10.18 of
the Original Agreement is hereby amended by adding the following sentence at the
end thereof:

                  "Unless the context otherwise requires or unless otherwise
         provided herein, the references in this Agreement to a particular
         statute, rule or regulation also refer to and include all amendments,
         supplements and other modifications to such statute, rule or
         regulation."

         Section 2.15. Disclosure Schedule. Paragraph 6 of the Disclosure
Schedule to the Original Agreement is hereby amended by adding the name of the
following Subsidiary thereto:

                  Canadian Mustang Energy Inc.

         Section 2.16. Canadian Notes. Each Canadian Note (and the form of
Canadian Note attached as Exhibit A-1 to the Original Agreement) are hereby
amended by deleting the proviso at the end of the first sentence of the fourth
paragraph thereof which reads as follows: "; provided that if an Event of
Default has occurred and is continuing, Canadian Base Rate Loans shall bear
interest on each day outstanding at the applicable Default Rate in effect on
such day". Each Canadian Note (and the form of Canadian Note attached as Exhibit
A-1 to the Original Agreement) are hereby further amended by deleting the
proviso at the end of the third sentence of the fourth paragraph

                                       7

                                    Third Amendment to Canadian Credit Agreement
<PAGE>

thereof which reads as follows: "; provided that if an Event of Default has
occurred and is continuing, Canadian Prime Rate Loans shall bear interest on
each day outstanding at the applicable Default Rate in effect on such day." Each
Canadian Note (and the form of Canadian Note attached as Exhibit A-1 to the
Original Agreement) are hereby further amended by deleting the proviso at the
end of the fifth sentence of the fourth paragraph thereof which reads as
follows: "; provided that if an Event of Default has occurred and is continuing,
such US Dollar Eurodollar Loan shall bear interest on each day outstanding at
the applicable Default Rate in effect on such day." Each Canadian Note (and the
form of Canadian Note attached as Exhibit A-1 to the Original Agreement) are
hereby further amended by deleting the proviso at the end of the seventh
sentence of the fourth paragraph thereof which reads as follows: "; provided
that if an Event of Default has occurred and is continuing, such Canadian Dollar
Eurodollar Loan shall bear interest on each day outstanding at the applicable
Default Rate in effect on such day."

         Section 2.17. Canadian Swing Note. The Canadian Swing Note (and the
form of Canadian Swing Note attached as Exhibit A-2 to the Original Agreement)
are hereby amended by deleting the proviso at the end of the first sentence of
the fourth paragraph thereof which reads as follows: "; provided that if an
Event of Default has occurred and is continuing, Canadian Swing Loans shall bear
interest on each day outstanding at the applicable Default Rate in effect on
such day."

         Section 2.18. Competitive Bid Notes. Each Competitive Bid Note issued
under the Canadian Agreement (and the form of Competitive Bid Note attached as
Exhibit M to the Original Agreement) are hereby amended by deleting the proviso
at the end of the first sentence of the fifth paragraph thereof which reads as
follows: "; provided that if an Event of Default has occurred and is continuing,
such Competitive Bid Loan shall bear interest on each day outstanding at the
applicable Default Rate in effect on such day."

                                  ARTICLE III.

                           Conditions of Effectiveness

         Section 3.1. Effective Date. This Amendment shall become effective as
of the date first above written when and only when:

         (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) this Amendment executed by Canadian Borrower, Canadian
         Agent and Canadian Required Lenders; provided that the amendment set
         forth in Section 2.2 hereof, insofar as it applies to the Canadian
         Notes, and in Section 2.16 hereof shall become effective only when
         executed and delivered by all Canadian Lenders, the amendment set forth
         in Section 2.3 hereof, insofar as it applies to the Canadian Swing
         Note, and in Section 2.17 hereof shall become effective only when
         executed and delivered by the Canadian Swing Lender, and the amendment
         set forth in Section 2.3 hereof, insofar as it

                                       8

                                    Third Amendment to Canadian Credit Agreement
<PAGE>

         applies to any Competitive Bid Note, and in Section 2.18 hereof shall
         become effective only when executed and delivered by the holder of such
         Competitive Bid Note; and provided further that the amendment set forth
         in Section 2.4 of this Amendment shall become effective only when
         executed and delivered by all Canadian Lenders.

                  (ii) a certificate of the Chairman of the Board, President, or
         Vice President - Finance of Canadian Borrower dated the date of this
         Amendment certifying: (i) that all of the representations and
         warranties set forth in Article IV hereof are true and correct at and
         as of such date, and (ii) that no Default exists at and as of such
         date.

         (b) Canadian Borrower shall have paid, in connection with such Canadian
Loan Documents, all fees and reimbursements to be paid to Canadian Agent
pursuant to any Canadian Loan Documents, or otherwise due Canadian Agent and
including fees and disbursements of Canadian Agent's attorneys.

                                   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

                                       9
<PAGE>

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 March 31, 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
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 and the
Canadian Notes as hereby amended are 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.

                                       10

                                    Third Amendment to Canadian Credit Agreement
<PAGE>

         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.

         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.

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

                                NORTHSTAR ENERGY CORPORATION
                                Canadian Borrower

                                By: /s/ John Richels
                                    --------------------------------------------
                                    Name:    John Richels
                                    Title:   President & Chief Executive Officer

                                       11

                                    Third Amendment to Canadian Credit Agreement
<PAGE>

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

                                By:      /s/ Donald R. Chung
                                         ---------------------------------------
                                         Name: Donald R. Chung
                                         Title: Vice President
                                                Corporate Investment Banking

                                BANK ONE, NA CANADA BRANCH
                                Lender

                                By:      /s/ Ronald L. Dierker
                                         ---------------------------------------
                                         Name: Ronald L. Dierker
                                         Title: Director, Capital Markets

                                THE CHASE MANHATTAN BANK, TORONTO BRANCH
                                Lender

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

                                By:      /s/ Ralph Kern
                                         ---------------------------------------
                                         Name: Ralph Kern
                                         Title: Authorized Representative

                                UMB BANK
                                Lender

                                By:      /s/ Richard J. Lehrter
                                         ---------------------------------------
                                         Name: Richard J. Lehrter
                                         Title: Community Bank President

                                FIRST UNION NATIONAL BANK
                                Lender

                                By:      /s/ David Humphreys
                                         ---------------------------------------
                                         Name: David Humphreys
                                         Title: Vice President

                                    Third Amendment to Canadian Credit Agreement
<PAGE>

                                WESTDEUTSCHE LANDESBANK GIROZENTRALE
                                Lender

                                By:      /s/ Salvatore Battinelli
                                         ---------------------------------------
                                         Name: Salvatore Battinelli
                                         Title: Managing Director, Credit Dept.

                                By:      /s/ Water T. Duffy III
                                         ---------------------------------------
                                         Name: Walter T. Duffy III
                                         Title: Associate Director

                                THE BANK OF NEW YORK
                                Lender

                                By:      /s/ Raymond J. Palmer
                                         ---------------------------------------
                                         Name: Raymond J. Palmer
                                         Title: Vice President

                                ROYAL BANK OF CANADA
                                Lender

                                By:      /s/ Tom J. Oberaigner
                                         ---------------------------------------
                                         Name: Tom J. Oberaigner
                                         Title: Senior Manager

                                SUNTRUST BANK, ATLANTA
                                Lender

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

                                THE CHASE MANHATTAN BANK, TORONTO BRANCH
                                Lender

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

                                    Third Amendment to Canadian Credit Agreement
<PAGE>

                                CITIBANK CANADA
                                Lender

                                By:      /s/ James K. G. Campbell
                                         ---------------------------------------
                                         Name: James K. G. Campbell
                                         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

                                CANADIAN IMPERIAL BANK OF COMMERCE
                                Lender

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

                                By:      /s/ David W. Richardson
                                         ---------------------------------------
                                         Name: David W. Richardson
                                         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

                                    Third Amendment to Canadian Credit Agreement
<PAGE>

                                BAYERISCHE LANDESBANK GIROZENTRALE,
                                CAYMAN ISLANDS BRANCH
                                Lender

                                By:      /s/ Hereward Drummond
                                         ---------------------------------------
                                         Name: Hereward Drummond
                                         Title: Senior Vice President

                                By:      /s/ James H. Boyle
                                         ---------------------------------------
                                         Name: James H. Boyle
                                         Title: Vice President

                                THE FUJI BANK, LIMITED
                                Lender

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

                                CREDIT LYONNAIS NEW YORK BRANCH
                                Lender

                                By:      /s/ Jacues Busquet
                                         ---------------------------------------
                                         Name: Jacques Busquet
                                         Title: Executive Vice President

                                BANK OF TOKYO - MITSUBISHI (CANADA)
                                Lender

                                By:      /s/ Davis J. Stewart
                                         ---------------------------------------
                                         Name: Davis J. Stewart
                                         Title: Vice President

                                    Third Amendment to Canadian Credit Agreement
<PAGE>

                                                                 Third 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 made by it for the benefit of Canadian Agent and Lenders
executed pursuant to the Credit 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 Canadian Guaranty and such other Canadian Loan Documents shall remain
in full force and effect.

                                        DEVON ENERGY CORPORATION

                                        By:  /s/ William T. Vaughn
                                             -----------------------------------
                                             Name: William T. Vaughn
                                             Title: Senior Vice President -
                                                    Finance

                                    Third Amendment to Canadian Credit Agreement

<PAGE>

                             COMPLIANCE CERTIFICATE

                          NORTHSTAR ENERGY CORPORATION

         Reference is made to that certain Third Amendment to Canadian Credit
Agreement dated as of July 31, 2001 (the "Third Amendment") among Northstar
Energy Corporation, ("Northstar"), Bank of America Canada, individually and as
administrative agent ("Canadian Agent"), and certain financial institutions
("Lenders"). Terms which are defined in the Third Amendment and which are used
but not defined herein shall have the meanings given them in the Third
Amendment. The undersigned, Paul F. Brereton, does hereby certify that he has
made a thorough inquiry into all matters certified herein and, based upon such
inquiry, experience, and the advice of counsel, does hereby further certify
that:

         1.       He is the duly elected, qualified, and acting Vice
                  President-Finance of Northstar.

         2.       All representations and warranties made by any Restricted
                  Person in any Canadian Loan Document delivered on or before
                  the date hereof are true on and as of the date hereof (except
                  to the extent that the facts upon which such representations
                  are based have been changed by the transactions contemplated
                  in the Third Amendment) as if such representations and
                  warranties had been made as of the date hereof.

         3.       No Default exists on the date hereof.

         4.       Each Restricted Person has performed and complied with all
                  agreements and conditions required in the Canadian Loan
                  Documents to be performed or complied with by it on or prior
                  to the date hereof.

         IN WITNESS WHEREOF, this instrument is executed by the undersigned as
of July 31, 2001.

                                        NORTHSTAR ENERGY CORPORATION

                                        By: /s/ Paul Brereton
                                            ------------------------------------
                                                Paul F. Brereton
                                                Vice President-Finance

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