SIXTH AMENDMENT TO COMBINED CREDIT AGREEMENTS

Exhibit 10.35

SIXTH AMENDMENT TO COMBINED CREDIT AGREEMENTS

          THIS SIXTH AMENDMENT TO COMBINED CREDIT AGREEMENTS (this “Amendment”), dated as of September 30, 2008, is entered into by and among QUICKSILVER RESOURCES INC., a Delaware corporation (the “U.S. Borrower”), QUICKSILVER RESOURCES CANADA INC., an Alberta, Canada corporation (the “Canadian Borrower” and, collectively with the U.S. Borrower, the “Combined Borrowers”), each of the Lenders (as defined in the U.S. Credit Agreement (as hereinafter defined)) party hereto (together with its successors and assigns, the “U.S. Lenders”), each of the Lenders (as defined in the Canadian Credit Agreement (as hereinafter defined)) party hereto (together with its successors and assigns, the “Canadian Lenders” and, together with the U.S. Lenders, the “Combined Lenders”), JPMORGAN CHASE BANK, N.A., as global administrative agent (in such capacity, the “Global Administrative Agent”), and JPMORGAN CHASE BANK, N.A., TORONTO BRANCH, as Canadian administrative agent (in such capacity, the “Canadian Administrative Agent”).

W I T N E S S E T H:

          1.          The U.S. Borrower, the Global Administrative Agent, the other Agents party thereto and the U.S. Lenders are parties to that certain Amended and Restated Credit Agreement dated as of February 9, 2007 (as amended, supplemented, restated or otherwise modified from time to time, the “U.S. Credit Agreement”), pursuant to which the U.S. Lenders agreed to make loans to, and extensions of credit on behalf of, the U.S. Borrower.

          2.          The Canadian Borrower, the Global Administrative Agent, the Canadian Administrative Agent, the other Agents party thereto and the Canadian Lenders are parties to that certain Amended and Restated Credit Agreement dated as of February 9, 2007 (as amended, supplemented, restated or otherwise modified from time to time, the “Canadian Credit Agreement” and, together with the U.S. Credit Agreement, the “Combined Credit Agreements”), pursuant to which the Canadian Lenders agreed to make loans to, and extensions of credit on behalf of, the Canadian Borrower.

          3.          The Combined Borrowers have requested (a) that the Global Borrowing Base (as defined in each of the Combined Credit Agreements), the U.S. Borrowing Base and the Allocated U.S. Borrowing Base (as defined in each of the Combined Credit Agreements) be increased as set forth herein and (b) that the Combined Credit Agreements be amended to amend certain other terms of the Combined Credit Agreements in certain respects as provided in this Amendment.

          4.          The U.S. Borrower has requested that Scotiabanc Inc. and Xxxxxxx Xxxxx Bank USA (each of the foregoing financial institutions are herein referred to as a “New U.S. Lender”) become new U.S. Lenders under the U.S. Credit Agreement with Global Commitments as shown on Schedule 2.1 to the U.S. Credit Agreement (as amended hereby).

          5.          Subject to and upon the terms and conditions set forth herein, the Combined Lenders have agreed to the Combined Borrowers’ requests.

1

          NOW, THEREFORE, in consideration of the premises and the mutual covenants herein contained, the parties hereto agree as follows:

          I.           Amendment to Section 10.4 of U.S. Credit Agreement.   In reliance on the representations and warranties of the U.S. Borrower and the Canadian Borrower contained herein, and subject to the terms, and satisfaction of the conditions precedent, set forth in Section VIII hereof, Section 10.4 of the U.S. Credit Agreement shall be amended effective as of the Effective Date to (a) delete the reference to “U.S.$5,000,000” set forth in clause (b)(iii) of Section 10.4 of the U.S. Credit Agreement and replace it with “U.S.$2,500,000 unless each of the Borrower (unless an Event of Default has occurred and is continuing) and the Global Administrative Agent otherwise consent”, (b) delete the reference to “U.S.$5,000,000” set forth in clause (b)(vii) of Section 10.4 of the U.S. Credit Agreement and replace it with “U.S.$2,500,000”, and (c) insert “(unless an Event of Default has occurred and is continuing)” after the reference to “Borrower” in clause (b)(vii) of Section 10.4 of the U.S. Credit Agreement.

          II.          Amendment to Section 10.4 of Canadian Credit Agreement.   In reliance on the representations and warranties of the U.S. Borrower and the Canadian Borrower contained herein, and subject to the terms, and satisfaction of the conditions precedent, set forth in Section VIII hereof, Section 10.4 of the Canadian Credit Agreement shall be amended effective as of the Effective Date to (a) delete the reference to “U.S.$5,000,000” set forth in clause (b)(iii) of Section 10.4 of the Canadian Credit Agreement and replace it with “U.S.$2,500,000 unless each of the Borrower (unless an Event of Default has occurred and is continuing) and the Global Administrative Agent otherwise consent”, (b) delete the reference to “U.S.$5,000,000” set forth in clause (b)(vii) of Section 10.4 of the Canadian Credit Agreement and replace it with “U.S.$2,500,000”, and (c) insert “(unless an Event of Default has occurred and is continuing)” after the reference to “Borrower” in clause (b)(vii) of Section 10.4 of the Canadian Credit Agreement.

          III.          Amendment to Schedule 2.1 of U.S. Credit Agreement.   In reliance on the representations and warranties of the U.S. Borrower and the Canadian Borrower contained herein, and subject to the terms, and satisfaction of the conditions precedent, set forth in Section VIII hereof, Schedule 2.1 to the U.S. Credit Agreement shall be deleted in its entirety and Schedule 2.1 – U.S. Credit Agreement attached to this Amendment shall be substituted in lieu thereof, effective as of the Effective Date.

          IV.          Amendment to Schedule 2.1 of Canadian Credit Agreement.   In reliance on the representations and warranties of the U.S. Borrower and the Canadian Borrower contained herein, and subject to the terms, and satisfaction of the conditions precedent, set forth in Section VIII hereof, Schedule 2.1 to the Canadian Credit Agreement shall be deleted in its entirety and Schedule 2.1 – Canadian Credit Agreement attached to this Amendment shall be substituted in lieu thereof, effective as of the Effective Date.

          V.           Joinder of New U.S. Lenders.   Effective as of the Effective Date, each New U.S. Lender hereby joins in, becomes a party to, and agrees to comply with and be bound by the terms and conditions of the U.S. Credit Agreement as a Lender thereunder and under each and every other Loan Document to which any U.S. Lender is required to be bound by the U.S. Credit Agreement, to the same extent as if such New U.S. Lender were an original signatory thereto.

2

         VI.          Global Borrowing Base.

          A.          Subject to adjustments pursuant to Sections 2.8(d), (e), (g), and (h) of the U.S. Credit Agreement or Sections 2.7(d), (e), (g), and (h) of the Canadian Credit Agreement, by execution of this Amendment, each of the Global Administrative Agent, the Combined Lenders, the U.S. Borrower and the Canadian Borrower agree during the period from the date hereof to the date of the next redetermination of the Global Borrowing Base (as defined in each of the Combined Credit Agreements) pursuant to the provisions of Section 2.8 of the U.S. Credit Agreement or Section 2.7 of the Canadian Credit Agreement that (a) the Global Borrowing Base (as defined in each of the Combined Credit Agreements) shall equal U.S.$1,200,000,000, (b) the U.S. Borrowing Base shall equal U.S.$915,000,000, (c) the Allocated U.S. Borrowing Base (as defined in each of the Combined Credit Agreements) shall equal U.S.$800,000,000, and (d) the Allocated Canadian Borrowing Base (as defined in each of the Combined Credit Agreements) shall equal U.S.$400,000,000.

          B.          Each of the Global Administrative Agent, the Combined Lenders, the U.S. Lenders, the U.S. Borrower and the Canadian Borrower agree and acknowledge that (a) the determination of the Global Borrowing Base (as defined in each of the Combined Credit Agreements) and U.S. Borrowing Base set forth in Section VI(A) of this Amendment is not a Scheduled Redetermination of the Global Borrowing Base (as defined in each of the Combined Credit Agreements) and the U.S. Borrowing Base pursuant to Section 2.8(b) of the U.S. Credit Agreement or Section 2.7(b) of the Canadian Credit Agreement and (b) such determination of the Global Borrowing Base (as defined in each of the Combined Credit Agreements) and the U.S. Borrowing Base shall not be considered as a request for a “discretionary determination” of the Global Borrowing Base (as defined in each of the Combined Credit Agreements) and the U.S. Borrowing Base by the Borrower, the Global Administrative Agent or the Required Lenders for the purposes of Section 2.8(e) of the U.S. Credit Agreement or Section 2.7(e) of the Canadian Credit Agreement.

          C.          In accordance with Section 2.1(c) of each of the U.S. Credit Agreement and the Canadian Credit Agreement, the Global Administrative Agent hereby notifies the Canadian Administrative Agent, the Combined Lenders, the U.S. Borrower and the Canadian Borrower of the reallocation of the Global Commitments under the Combined Credit Agreements as set forth and described on Schedule 2.1 – U.S. Credit Agreement and Schedule 2.1 – Canadian Credit Agreement attached hereto.

          VII.       Rearrangement of Existing Loans.   Upon the effectiveness of this Amendment:

          A.          All of the Combined Commitments and outstanding Combined Obligations under the Combined Credit Agreements as of the date of such effectiveness shall hereby be restructured, rearranged, renewed, extended and continued under the applicable Combined Credit Agreement (as amended hereby) and all Combined Loans and Letters of Credit (as defined in each of the Combined Credit Agreements) outstanding under the applicable Combined Credit Agreement as of the date of such effectiveness shall hereby become Combined Loans and Letters of Credit (as defined in each of the Combined Credit Agreements) outstanding under the applicable Combined Credit Agreement (as amended hereby).

3

          B.          In connection herewith, the Combined Lenders party to the Combined Credit Agreements prior to the effectiveness of this Amendment (the “Existing Lenders”) hereby sell, assign, transfer and convey, and the Combined Lenders hereby purchase and accept, so much of the aggregate Combined Commitments under, Combined Loans outstanding under, and participations in Letters of Credit (as defined in each of the Combined Credit Agreements) issued pursuant to, the Combined Credit Agreements such that the Combined Commitment of each Combined Lender shall be as set forth on Schedule 2.1 to each of the Combined Credit Agreements (as amended hereby).   The foregoing assignments, transfers and conveyances are without recourse to the Existing Lenders and without any warranties whatsoever by any Agent, any Issuing Bank or any Existing Lender as to title, enforceability, collectability, documentation or freedom from liens or encumbrances, in whole or in part, other than the warranty of each Existing Lender that it has not previously sold, transferred, conveyed or encumbered such interests.

          VIII.      Effectiveness.   This Amendment shall become effective as of the date that each of the following conditions precedent have been satisfied (the “Effective Date”):

          A.          The Global Administrative Agent shall have received counterparts hereof duly executed by the U.S. Borrower, the Canadian Borrower, the Global Administrative Agent, the Canadian Administrative Agent, each Combined Lender whose Commitment is increasing hereunder, each New U.S. Lender, the Supermajority Lenders and the U.S. Supermajority Lenders (or, in the case of any party as to which an executed counterpart shall not have been received, telegraphic, telex, or other written confirmation from such party of execution of a counterpart hereof by such party).

          B.          The Combined Borrowers shall have paid (i) all reasonable out-of-pocket fees and expenses of counsel for the Global Administrative Agent incurred, to the extent the same have been invoiced and sent to the U.S. Borrower at least two (2) Business Days prior to the Effective Date, including all such out-of-pocket fees and expenses incurred in connection with the preparation, negotiation and execution of this Amendment and any other Combined Loan Documents to be executed and delivered in connection therewith and (ii) any and all fees payable to Global Administrative Agent or certain Combined Lenders pursuant to or in connection with this Amendment in consideration for the agreements set forth herein.

          C.          Each Combined Lender that is a New U.S. Lender or whose Global Commitment is increasing hereunder that has requested a Note shall have received a duly completed and executed Note, payable to the order of such Combined Lender.

          D.          If, on the Effective Date, any Eurodollar Borrowings are outstanding under the Combined Credit Agreements and if the Effective Date is not the last day of the Interest Period(s) in respect of such Eurodollar Borrowings, the Combined Borrowers shall have paid any compensation required under Section 2.17 of the U.S. Credit Agreement and Section 2.16 of the Canadian Credit Agreement.

          E.          No Default, Event of Default, Global Borrowing Base Deficiency or U.S. Borrowing Base Deficiency shall have occurred which is continuing.

4

          IX.       Reaffirmation of Representations and Warranties.   To induce the Combined Lenders and the Global Administrative Agent to enter into this Amendment, the U.S. Borrower and the Canadian Borrower hereby reaffirm, as of the date hereof, the following:

                     (i)           The representations and warranties of each Loan Party (as such term is defined in the U.S. Credit Agreement and the Canadian Credit Agreement, collectively, the “Combined Loan Parties”) set forth in the Combined Loan Documents to which it is a party are true and correct on and as of the date hereof (or, if stated to have been made expressly as of an earlier date, were true and correct in all material respects as of such date and, except to the extent waived in writing by the Combined Lenders, the Required Lenders, the Majority Lenders, the U.S. Lenders or the U.S. Required Lenders, as applicable).

                     (ii)           Each of the Combined Loan Parties (a) is a corporation or limited partnership duly incorporated or organized (as applicable), validly existing and in good standing under the laws of its jurisdiction of incorporation or organization, (b) has all corporate or limited partnership power (as applicable) and all material governmental licenses, authorizations, consents and approvals required to carry on its businesses as now conducted and as proposed to be conducted, and (c) is duly qualified to transact business as a foreign corporation or limited partnership in each jurisdiction where a failure to be so qualified would reasonably be expected to have a Material Adverse Effect.

                     (iii)           The execution, delivery and performance of this Amendment and the other Combined Loan Documents by each Combined Loan Party (to the extent each Combined Loan Party is a party to this Amendment and such Combined Loan Documents) (a) are within such Combined Loan Party’s corporate or limited partnership powers, (b) when executed will be duly authorized by all necessary corporate or limited partnership action, (c) require no action by or in respect of, or filing with, any Governmental Authority (other than (1) actions or filings pursuant to the Exchange Act and (2) actions or filings that have been taken or made and are in full force and effect) and (d) do not contravene, or constitute a default under, any provision of applicable Governmental Rule (including, without limitation, Regulation U) or of the articles or certificate of incorporation, bylaws, regulations, partnership agreement or comparable charter documents of any Combined Loan Party or of any agreement, judgment, injunction, order, decree or other instrument binding upon any Combined Loan Party or result in the creation or imposition of any Lien on any Borrowing Base Property or Collateral other than the Liens securing the Combined Obligations.

                     (iv)           This Amendment and each other Combined Loan Document constitutes, or when executed and delivered will constitute, valid and binding obligations of each Combined Loan Party which is a party thereto, enforceable against each such Combined Loan Party which executes the same in accordance with its terms except as the enforceability thereof may be limited by (a) bankruptcy, insolvency, reorganization, moratorium, or similar Governmental Rules affecting creditors’ rights generally, and (b) equitable principles of general applicability (whether enforcement is sought by proceedings at law or in equity).

5

                     (v)          Neither a Default nor an Event of Default has occurred and will exist under either Combined Credit Agreement after giving effect to the transactions contemplated by, and the amendments contained in, this Amendment or the other Combined Loan Documents.   Neither the U.S. Borrower or any of its Subsidiaries nor the Canadian Borrower or any of its Subsidiaries is in default under, nor has any event or circumstance occurred which, but for the expiration of any applicable grace period or the giving of notice, or both, would constitute a default under, any Material Agreement to which the U.S. Borrower or any of its Subsidiaries or the Canadian Borrower or any of its Subsidiaries is a party or by which the U.S. Borrower or any of its Subsidiaries or the Canadian Borrower or any of its Subsidiaries is bound which default would reasonably be expected to have a Material Adverse Effect.   The U.S. Borrower is in compliance with the financial covenants set forth in Article VI of the U.S. Credit Agreement.

                     (vi)          No event or events have occurred since December 31, 2007 which individually or in the aggregate would reasonably be expected to have a Material Adverse Effect.

          X.          Representations and Warranties of New U.S. Lenders.   Each New U.S. Lender (i) represents and warrants that (a) it has full power and authority, and has taken all action necessary, to execute and deliver this Amendment, to consummate the transactions contemplated hereby and to become a Lender under the U.S. Credit Agreement, (b) from and after the Effective Date, it shall be bound by the provisions of the U.S. Credit Agreement as a Lender thereunder, (c) it has received a copy of the U.S. Credit Agreement, together with copies of the most recent financial statements delivered pursuant to Section 5.1 thereof, and such other documents and information as it has deemed appropriate to make its own credit analysis and decision to enter into this Amendment and to become a Lender on the basis of which it has made such analysis and decision independently and without reliance on the Global Administrative Agent or any other U.S. Lender, and (d) if it is a Foreign Lender, attached hereto is any documentation required to be delivered by it pursuant to the terms of the U.S. Credit Agreement, duly completed and executed by the New U.S. Lender; and (ii) agrees that (a) it will, independently and without reliance on the Global Administrative Agent or any other U.S. Lender, and based on such documents and information as it shall deem appropriate at the time, continue to make its own credit decisions in taking or not taking action under the Loan Documents, and (b) it will perform in accordance with their terms all of the obligations which by the terms of the Loan Documents are required to be performed by it as a Lender.

         XI.          Defined Terms.   Capitalized terms used herein when defined in the U.S. Credit Agreement (including, to the extent applicable, after giving effect to this Amendment) shall have the same meanings herein unless the context otherwise requires.

         XII.         Reaffirmation of Combined Credit Agreements.   This Amendment shall be deemed to be an amendment to the Combined Credit Agreements, and the Combined Credit Agreements, as amended hereby, are hereby ratified, approved and confirmed in each and every respect.   All references to the Combined Credit Agreements herein and in any other document, instrument, agreement or writing shall hereafter be deemed to refer to the Combined Credit Agreements as amended hereby.

6

          XIII.          Governing Law.   THIS AMENDMENT SHALL BE CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF TEXAS.

           NOTWITHSTANDING THE FOREGOING SENTENCE AND AFTER GIVING EFFECT TO THE TEXTUAL AMENDMENTS CONTAINED IN SECTIONS I, II, III AND IV OF THIS AMENDMENT, (i) THE U.S. CREDIT AGREEMENT (AS AMENDED HEREBY) SHALL CONTINUE TO BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH, THE LAW SPECIFIED IN SECTION 10.9(a) OF THE U.S. CREDIT AGREEMENT, AND (ii) THE CANADIAN CREDIT AGREEMENT (AS AMENDED HEREBY) SHALL CONTINUE TO BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH, THE LAW SPECIFIED IN SECTION 10.9(a) OF THE CANADIAN CREDIT AGREEMENT.

          XIV.          Severability of Provisions.   Any provision of this Amendment held to be invalid, illegal or unenforceable in any jurisdiction shall, as to such jurisdiction, be ineffective to the extent of such invalidity, illegality or unenforceability without affecting the validity, legality and enforceability of the remaining provisions hereof; and the invalidity of a particular provision in a particular jurisdiction shall not invalidate such provision in any other jurisdiction.

          XV.            Counterparts.   This Amendment may be executed in counterparts (and by different parties hereto on different counterparts), each of which shall constitute an original, but all of which when taken together shall constitute a single contract.   Delivery of an executed counterpart of a signature page of this Amendment by telecopy (or other electronic transmission acceptable to the Global Administrative Agent) shall be effective as delivery of a manually executed counterpart of this Amendment.

          XVI.          Headings.   Article and Section headings used herein are for convenience of reference only, are not part of this Amendment and shall not affect the construction of, or be taken into consideration in interpreting, this Amendment.

          XVII.        Successors and Assigns.   This Amendment shall be binding upon and inure to the benefit of the parties hereto and their respective successors and assigns permitted hereby (including any Affiliate of an Issuing Bank that issues any Letter of Credit), except that neither the U.S. Borrower nor the Canadian Borrower may assign or otherwise transfer any of its rights or obligations hereunder without the prior written consent of the Global Administrative Agent, each Issuing Bank and each Combined Lender (and any attempted assignment or transfer by either the U.S. Borrower or the Canadian Borrower without such consent shall be null and void).

         XVIII.        No Oral Agreements.   THIS AMENDMENT, THE COMBINED CREDIT AGREEMENTS, AS AMENDED HEREBY, AND THE OTHER COMBINED LOAN DOCUMENTS REPRESENT THE FINAL AGREEMENT BETWEEN AND AMONG THE PARTIES WITH RESPECT TO THE SUBJECT MATTER HEREOF AND THEREOF AND MAY NOT BE CONTRADICTED BY EVIDENCE OF PRIOR, CONTEMPORANEOUS, OR SUBSEQUENT ORAL AGREEMENTS OF THE PARTIES.   THERE ARE NO UNWRITTEN ORAL AGREEMENTS AMONG THE PARTIES.

7

          XIX.          Loan Document.   This Amendment constitutes a “Loan Document,” a “Canadian Loan Document” and a “Combined Loan Document” under and as defined in the U.S. Credit Agreement, and a “Loan Document,” a “U.S. Loan Document” and a “Combined Loan Document” under and as defined in the Canadian Credit Agreement.

[Signature Pages to Follow]

8

          IN WITNESS WHEREOF, the U.S. Borrower, the Canadian Borrower, the undersigned Combined Lenders, the Global Administrative Agent and the Canadian Administrative Agent have executed this Amendment as of the date first above written.

		U.S. BORROWER
		QUICKSILVER RESOURCES INC., a Delaware corporation, as U.S. Borrower
		By:		/s/ XxxXx Xxxxxx
				XxxXx Xxxxxx, Vice President – Treasurer
		CANADIAN BORROWER
		QUICKSILVER RESOURCES CANADA INC., an Alberta, Canada corporation, as Canadian Borrower
		By:		/s/ XxxXx Xxxxxx
				XxxXx Xxxxxx, Vice President – Treasurer

Each of the undersigned (i) acknowledge, consent and agree to this Amendment and each of the terms and provisions contained herein, and (ii) agree that the Combined Loan Documents (as amended hereby) to which it is a party shall remain in full force and effect and shall continue to be the legal, valid and binding obligation of such Person, enforceable against it in accordance with its terms.

		ACKNOWLEDGED, CONSENTED AND AGREED TO as of the date first above written:
		COWTOWN GAS PROCESSING L.P., a Texas limited partnership
		By:		Cowtown Pipeline Management, Inc., its general partner

		By:		/s/ XxxXx Xxxxxx
		Name:		XxxXx Xxxxxx
		Title:		Vice President – Treasurer

[Signature Page]
Sixth Amendment to Combined Credit Agreements

Quicksilver Resources Inc.

		COWTOWN PIPELINE MANAGEMENT, INC., a Texas corporation
		By:		/s/ XxxXx Xxxxxx
		Name:		XxxXx Xxxxxx
		Title:		Vice President – Treasurer
		COWTOWN PIPELINE FUNDING, INC., a Delaware corporation
		By:		/s/ XxxXx Xxxxxx
		Name:		XxxXx Xxxxxx
		Title:		Vice President – Treasurer
		COWTOWN PIPELINE L.P., a Texas limited partnership
		By:		Cowtown Pipeline Management, Inc., its general partner

		By:		/s/ XxxXx Xxxxxx
		Name:		XxxXx Xxxxxx
		Title:		Vice President – Treasurer

		QUICKSILVER RESOURCES HORN RIVER INC., an Alberta, Canada corporation
		By:		/s/ XxxXx Xxxxxx
		Name:		XxxXx Xxxxxx
		Title:		Vice President – Treasurer

[Signature Page]
Sixth Amendment to Combined Credit Agreements

Quicksilver Resources Inc.

		AGENTS AND COMBINED LENDERS
		JPMORGAN CHASE BANK, N.A., as Global Administrative Agent and as a U.S. Lender
		By:		/s/ Xxxxx Xxxxxxx
		Name:		Xxxxx Xxxxxxx
		Title:		Vice President

[Signature Page]
Sixth Amendment to Combined Credit Agreements

Quicksilver Resources Inc.

		JPMORGAN CHASE BANK, N.A., TORONTO BRANCH, as a Canadian Administrative Agent and as a Canadian Lender
		By:		/s/ Xxxxxxx X. Xxx
		Name:		Xxxxxxx X. Xxx
		Title:		Senior Vice President

[Signature Page]
Sixth Amendment to Combined Credit Agreements

Quicksilver Resources Inc.

		BANK OF AMERICA, N.A., as a U.S. Lender
		By:		/s/ Xxxxxx X. XxXxxx
		Name:		Xxxxxx X. XxXxxx
		Title:		Senior Vice President

[Signature Page]
Sixth Amendment to Combined Credit Agreements

Quicksilver Resources Inc.

		BNP PARIBAS, as a U.S. Lender
		By:		/s/ Xxxxxxxx Xxxxxxx
		Name:		Xxxxxxxx Xxxxxxx
		Title:		Vice President
		By:		/s/ Xxxxx Xxxxxx
		Name:		Xxxxx Xxxxxx
		Title:		Director

[Signature Page]
Sixth Amendment to Combined Credit Agreements

Quicksilver Resources Inc.

		FORTIS CAPITAL CORP.,
		as a U.S. Lender
		By:		/s/ Xxxxxxx Xxxxx
		Name:		Xxxxxxx Xxxxx
		Title:		Director
		By:		/s/ Xxxxxxx Xxxxxx
		Name:		Xxxxxxx Xxxxxx
		Title:		Managing Director

[Signature Page]
Sixth Amendment to Combined Credit Agreements

Quicksilver Resources Inc.

		THE BANK OF NOVA SCOTIA, as a U.S. Lender
		By:		/s/ Xxxxx X. Xxxxx
		Name:		Xxxxx Xxxxx
		Title:		Director

[Signature Page]
Sixth Amendment to Combined Credit Agreements

Quicksilver Resources Inc.

		DEUTSCHE BANK TRUST COMPANY AMERICAS, as U.S. Lender
		By:		/s/ Xxxxx Xxxxxxx
		Name:		Xxxxx Xxxxxxx
		Title:		Vice President
		By:		/s/ Xxxx Xxxxxxxxx
		Name:		Xxxx Xxxxxxxxx
		Title:		Vice President

[Signature Page]
Sixth Amendment to Combined Credit Agreements

Quicksilver Resources Inc.

		THE ROYAL BANK OF SCOTLAND plc, as a U.S. Lender
		By:		/s/ Xxxx Xxxxxx
		Name:		Xxxx Xxxxxx
		Title:		Vice President

[Signature Page]
Sixth Amendment to Combined Credit Agreements

Quicksilver Resources Inc.

		CALYON NEW YORK BRANCH, as a U.S. Lender
		By:		/s/ Xxxxxxx Xxxxxxx
		Name:		Xxxxxxx Xxxxxxx
		Title:		Managing Director
		By:		/s/ Xxxxxxx Xxxxx
		Name:		Xxxxxxx Xxxxx
		Title:		Director

[Signature Page]
Sixth Amendment to Combined Credit Agreements

Quicksilver Resources Inc.

		CITIBANK, N.A., as a U.S. Lender
		By:		/s/ Xxxxx X. Xxxx
		Name:		Xxxxx X. Xxxx
		Title:		Vice President

[Signature Page]
Sixth Amendment to Combined Credit Agreements

Quicksilver Resources Inc.

		UNION BANK OF CALIFORNIA, N.A., as a U.S. Lender
		By:		/s/ Xxxxxx Xxxxx
		Name:		Xxxxxx Xxxxx
		Title:		Assistant Vice President

[Signature Page]
Sixth Amendment to Combined Credit Agreements

Quicksilver Resources Inc.

		XXXXX FARGO BANK, N.A., as a U.S. Lender
		By:		/s/ Xxxxx X. Xxxxxx
		Name:		Xxxxx X. Xxxxxx
		Title:		Vice President

[Signature Page]
Sixth Amendment to Combined Credit Agreements

Quicksilver Resources Inc.

		TORONTO DOMINION (TEXAS) LLC, as a U.S. Lender
		By:		/s/ Xxxxx X. Xxxxx
		Name:		Xxxxx X. Xxxxx
		Title:		Authorized Signatory

[Signature Page]
Sixth Amendment to Combined Credit Agreements

Quicksilver Resources Inc.

		U.S. BANK NATIONAL ASSOCIATION, as a U.S. Lender
		By:		/s/ Xxxxx Xxxxxxx
		Name:		Xxxxx Xxxxxxx
		Title:		Vice President

[Signature Page]
Sixth Amendment to Combined Credit Agreements

Quicksilver Resources Inc.

		SUMITOMO MITSUI BANKING CORPORATION, as a U.S. Lender
		By:		/s/ Xxxxxxx Xxxx
		Name:		Xxxxxxx Xxxx
		Title:		General Manager

[Signature Page]
Sixth Amendment to Combined Credit Agreements

Quicksilver Resources Inc.

		COMPASS BANK, as a U.S. Lender
		By:		/s/ Xxxxxxx Xxxxxxxx
		Name:		Xxxxxxx Xxxxxxxx
		Title:		Senior Vice President

[Signature Page]
Sixth Amendment to Combined Credit Agreements

Quicksilver Resources Inc.

		SOCIÉTÉ GÉNÉRALE, as a U.S. Lender
		By:		/s/ Xxxxxxx X. Xxxxxx
		Name:		Xxxxxxx X. Xxxxxx
		Title:		Managing Director

[Signature Page]
Sixth Amendment to Combined Credit Agreements

Quicksilver Resources Inc.

		COMERICA BANK, as a U.S. Lender
		By:		/s/ Xxxxxxx X. Xxxxxx
		Name:		Xxxxxxx X. Xxxxxx
		Title:		Assistant Vice President

[Signature Page]
Sixth Amendment to Combined Credit Agreements
Quicksilver Resources Inc.

		STERLING BANK, as a U.S. Lender
		By:		/s/ Xxxxxxx X. Xxxxxx
		Name:		Xxxxxxx X. Xxxxxx
		Title:		Senior Vice President

[Signature Page]
Sixth Amendment to Combined Credit Agreements
Quicksilver Resources Inc.

		CIBC INC., as a U.S. Lender
		By:		/s/ Xxxxxxx X. Xxxxxxxx
		Name:		Xxxxxxx X. Xxxxxxxx
		Title:		Executive Director
		CIBC World Markets Corp. Authorized Signatory

[Signature Page]
Sixth Amendment to Combined Credit Agreements
Quicksilver Resources Inc.

		KEYBANK NATIONAL ASSOCIATION, as a U.S. Lender
		By:		/s/ Xxxx Xxxxx
		Name:		Xxxx Xxxxx
		Title:		Assistant Vice President

[Signature Page]
Sixth Amendment to Combined Credit Agreements
Quicksilver Resources Inc.

		EXPORT DEVELOPMENT CANADA, as a U.S. Lender
		By:		/s/ Xxxxxxxx Xxxxx
		Name:		Xxxxxxxx Xxxxx
		Title:		Senior Financing Manager
		By:		/s/ Xxxxxxxx Xxxxxxxxx
		Name:		Xxxxxxxx Xxxxxxxxx
		Title:		Senior Associate

[Signature Page]
Sixth Amendment to Combined Credit Agreements
Quicksilver Resources Inc.

		BARCLAYS BANK PLC, as a U.S. Lender
		By:		/s/ Xxxxxx Xxxxxxxxx
		Name:		Xxxxxx Xxxxxxxxx
		Title:		Director

[Signature Page]
Sixth Amendment to Combined Credit Agreements
Quicksilver Resources Inc.

		CREDIT SUISSE, CAYMAN ISLANDS BRANCH, as a U.S. Lender
		By:		/s/ Xxxxxxx Xxxxx
		Name: Title:		Xxxxxxx Xxxxx Director
		By:		/s/ Xxxxx Xxxxx
		Name:		Xxxxx Xxxxx
		Title:		Associate

[Signature Page]
Sixth Amendment to Combined Credit Agreements
Quicksilver Resources Inc.

		SCOTIABANC INC., as a U.S. Lender
		By:		/s/ X.X. Xxxx
		Name:		X.X. Xxxx
		Title:		Managing Director

[Signature Page]
Sixth Amendment to Combined Credit Agreements
Quicksilver Resources Inc.

		XXXXXXX SACHS BANK USA, as a U.S. Lender
		By:		/s/ Xxxx Xxxxxx
		Name:		Xxxx Xxxxxx
		Title:		Authorized Signatory

[Signature Page]
Sixth Amendment to Combined Credit Agreements
Quicksilver Resources Inc.

		BANK OF AMERICA, N.A. (by its Canada branch), as a Canadian Lender
		By:		/s/ Xxxxxx Sales xx Xxxxxxx
		Name:		Xxxxxx Sales xx Xxxxxxx
		Title:		Vice President

[Signature Page]
Sixth Amendment to Combined Credit Agreements
Quicksilver Resources Inc.

		BNP PARIBAS (CANADA), as a Canadian Lender
		By:		/s/ Xxxxx Xxxx
		Name:		Xxxxx Xxxx
		Title:		Vice President
		By:		/s/ Xxxxxxx Xxxxxxxx
		Name:		Xxxxxxx Xxxxxxxx
		Title:		Managing Director

[Signature Page]
Sixth Amendment to Combined Credit Agreements
Quicksilver Resources Inc.

		FORTIS CAPITAL (CANADA) LTD., as a Canadian Lender
		By:		/s/ Xxxx Xxxxx
		Name:		Xxxx Xxxxx
		Title:		Assistant Vice President
		By:		/s/ Xxxxx Boogers
		Name:		Xxxxx Boogers
		Title:		Director

[Signature Page]
Sixth Amendment to Combined Credit Agreements
Quicksilver Resources Inc.

		THE BANK OF NOVA SCOTIA, as a Canadian Lender
		By:		/s/ Xxxxxx Xxxxxxx
		Name:		Xxxxxx Xxxxxxx
		Title:		Director
		By:		/s/ Xxxx Xxxxxxx
		Name:		Xxxx Xxxxxxx
		Title:		Associate

[Signature Page]
Sixth Amendment to Combined Credit Agreements
Quicksilver Resources Inc.

		DEUTSCHE BANK AG CANADA BRANCH, as a Canadian Lender
		By:		/s/ Xxxxx Xxxx
		Name: Title:		Xxxxx Xxxx Chief Financial Officer
		By:		/s/ Xxxxxxxxx Xxxxx
		Name: Title:		Xxxxxxxxx Xxxxx Assistant Vice President

[Signature Page]
Sixth Amendment to Combined Credit Agreements
Quicksilver Resources Inc.

		CITIBANK, N.A., CANADIAN BRANCH, as a Canadian Lender
		By:		/s/ Xxxx Xxxxx
		Name:		Xxxx Xxxxx
		Title:		Authorised Signer

[Signature Page]
Sixth Amendment to Combined Credit Agreements
Quicksilver Resources Inc.

		UNION BANK OF CALIFORNIA, CANADA BRANCH, as a Canadian Lender
		By:		/s/ Xxxx Xxxxxx
		Name:		Xxxx Xxxxxx
		Title:		Senior Vice President

[Signature Page]
Sixth Amendment to Combined Credit Agreements
Quicksilver Resources Inc.

		XXXXX FARGO FINANCIAL CORPORATION CANADA, as a Canadian Lender
		By:		/s/ Xxxx X. Xxxxxx
		Name:		Xxxx X. Xxxxxx
		Title:		Vice President

[Signature Page]
Sixth Amendment to Combined Credit Agreements
Quicksilver Resources Inc.

		THE TORONTO-DOMINION BANK, as a Canadian Lender
		By:		/s/ Xxxxx X. Xxxxx
		Name:		Xxxxx X. Xxxxx
		Title:		Authorized Signatory

[Signature Page]
Sixth Amendment to Combined Credit Agreements
Quicksilver Resources Inc.

		U.S. BANK NATIONAL ASSOCIATION, as a Canadian Lender
		By:		/s/ Xxxxx Xxxxxxxx
		Name:		Xxxxx Xxxxxxxx
		Title:		Vice President and Principal Officer

[Signature Page]
Sixth Amendment to Combined Credit Agreements
Quicksilver Resources Inc.

		SUMITOMO MITSUI BANKING CORPORATION OF CANADA, as a Canadian Lender
		By:		/s/ Xxxxxx Xxx
		Name:		Xxxxxx Xxx
		Title:		Senior Vice President

[Signature Page]
Sixth Amendment to Combined Credit Agreements
Quicksilver Resources Inc.

		SOCIÉTÉ GÉNÉRALE (CANADA BRANCH), as a Canadian Lender
		By:		/s/ Xxxxx Xxxxxxx
		Name:		Xxxxx XXXXXXX
		Title:		Managing Director
		By:		/s/ Xxxx Xxxxxxxxx
		Name:		Xxxx XXXXXXXXX
		Title:		Vice President

[Signature Page]
Sixth Amendment to Combined Credit Agreements
Quicksilver Resources Inc.

		COMERICA BANK, a Texas banking association and authorized foreign bank under the Bank Act (Canada), as a Canadian Lender
		By:		/s/ Xxxx Xxxxx
		Name:		Xxxx Xxxxx
		Title:		Portfolio Manager

[Signature Page]
Sixth Amendment to Combined Credit Agreements
Quicksilver Resources Inc.

		CANADIAN IMPERIAL BANK OF COMMERCE, as a Canadian Lender
		By:		/s/ Xxxxx Xxxxxxxxxx
		Name:		Xxxxx Xxxxxxxxxx
		Title:		Executive Director
		By:		/s/ Xxxxx Xxxxx
		Name:		Xxxxx Xxxxx
		Title:		Executive Director

[Signature Page]
Sixth Amendment to Combined Credit Agreements
Quicksilver Resources Inc.

		KEYBANK NATIONAL ASSOCIATION, as a Canadian Lender
		By:		/s/ Xxxx Xxxxx
		Name: Title:		Xxxx Xxxxx Assistant Vice President

[Signature Page]
Sixth Amendment to Combined Credit Agreements
Quicksilver Resources Inc.

		BARCLAYS BANK PLC, as a Canadian Lender
		By:		/s/ Xxxxxx Xxxxxxxxx
		Name:		Xxxxxx Xxxxxxxxx
		Title:		Director

[Signature Page]
Sixth Amendment to Combined Credit Agreements
Quicksilver Resources Inc.

		CREDIT SUISSE, TORONTO BRANCH, as a Canadian Lender
		By:		/s/ Xxxxx Xxxxxx
		Name:		Xxxxx Xxxxxx
		Title:		Director
		By:		/s/ Xxxx Xxxxx
		Name:		Xxxx Xxxxx
		Title:		VP

[Signature Page]
Sixth Amendment to Combined Credit Agreements
Quicksilver Resources Inc.