Amendment No. 1 to Credit Agreement among Quicksilver Resources Inc., Lenders, and Credit Suisse, dated June 3, 2009

     AMENDMENT NO. 1 dated as of June 3, 2009 (this “Amendment”), to the Credit Agreement dated as of August 8, 2008 (as amended, supplemented or otherwise modified through the date hereof, the “Credit Agreement”), among Quicksilver Resources Inc., a Delaware corporation (the “Borrower”), the Lenders from time to time party thereto and Credit Suisse, Cayman Islands Branch, as the Administrative Agent.

          WHEREAS, pursuant to the Credit Agreement, the Lenders have made Loans to the Borrower;

          WHEREAS, the Borrower has informed the Administrative Agent that it desires to refinance all or a portion of the Loans outstanding under the Credit Agreement with the proceeds of an offering and sale of new senior notes of the Borrower (the “New Senior Notes”);

          WHEREAS, the Borrower has requested that, in the event the Loans outstanding under the Credit Agreement are refinanced with the proceeds of the New Senior Notes in part but not in full, the Credit Agreement and the other Loan Documents be amended (a) to permit the issuance of the New Senior Notes, and the grant of a security interest in the Collateral to secure the obligations of the Borrower and the Subsidiaries under the New Senior Notes, and (b) to effect such other amendments as are set forth herein; and

          WHEREAS, the Lenders party hereto, which represent at least the Required Lenders, are willing to agree to such amendments on the terms and subject to the conditions set forth herein.

          NOW, THEREFORE, in consideration of the mutual agreements herein contained and other good and valuable consideration, the sufficiency and receipt of which are hereby acknowledged, the parties hereto hereby agree as follows:

          SECTION 1. Defined Terms. Capitalized terms used but not otherwise defined herein (including in the recitals hereto) have the meanings assigned to them in the Credit Agreement.

          SECTION 2. Amendments to the Credit Agreement. (a) Section 1.01 of the Credit Agreement is hereby amended as follows:

     (i) The following new defined terms are inserted in the appropriate alphabetical order:

          “First Amendment” means the Amendment No. 1 dated as of June 3, 2009, to this Agreement.

          “First Amendment Effective Date” has the meaning given to the term “Amendment Effective Date” in the First Amendment.

          “New Senior Notes” means senior notes of the Borrower issued on or after the First Amendment Effective Date, and the Indebtedness represented thereby.

          “New Senior Notes Documents” means the New Senior Notes, the New Senior Notes Indenture and all promissory notes, guarantees and other documents, instruments and agreements executed and delivered pursuant to the New Senior Notes Indenture evidencing, guaranteeing or otherwise pertaining to the New Senior Notes, other than any Security Documents.

          “New Senior Notes Indenture” means that certain Indenture dated as of December 22, 2005, between the Borrower and The Bank of New York Mellon Trust Company, N.A. (as successor in interest), as trustee (or any successor trustee), as supplemented by a Supplemental Indenture to be entered into in connection with the issuance of the New Senior Notes.

     (ii) The following defined terms are hereby amended and restated in their entirety as follows:

          “Alternate Base Rate” means, for any day, a rate per annum equal to the greatest of (a) the Prime Rate in effect on such day, (b) the Federal Funds Effective Rate in effect on such day plus 1/2 of 1%, (c) the Adjusted Eurodollar Rate for a one month Interest Period on such day (or if such day is not a Business Day, the immediately preceding Business Day) plus 1% (provided that, for the avoidance of doubt, the Adjusted Eurodollar Rate for any day shall be based on the British Bankers’ Association LIBOR rate for deposits in U.S. Dollars as reported by any generally recognized financial information service at approximately 11:00 a.m., London time, on such day) and (d) 4.25%. Any change in the Alternate Base Rate due to a change in the Prime Rate, the Federal Funds Effective Rate or the Adjusted Eurodollar Rate shall be effective on the effective date of such change in the Prime Rate, the Federal Funds Effective Rate or the Adjusted Eurodollar Rate, as the case may be. If the Administrative Agent shall have determined (which determination shall be conclusive and binding, absent manifest error) that it is unable to ascertain the Federal Funds Effective Rate for any reason, including the inability or failure of the Administrative Agent to obtain sufficient quotations in accordance with the terms of the definition of such term, the Alternate Base Rate shall be determined without regard to clause (b) of the preceding sentence until the circumstances giving rise to such inability no longer exist.

          “Applicable Margin” means, for any day, (a) with respect to any Eurodollar Loan, 4.50% per annum, and (b) with respect to any ABR Loan, 3.50% per annum, in each case plus an Incremental Applicable Margin, if any, applicable on such day; provided, however, that, after June 30, 2009, the term “Applicable Margin” shall mean (i) with respect to any Eurodollar Loan, 7.00% per annum, and (ii) with respect to any ABR Loan, 6.00% per annum, in each case plus an Incremental Applicable Margin, if any, applicable on such day.

          “Existing Notes” means the Existing Convertible Debentures, the Existing Senior Notes, the Existing Subordinated Notes and the New Senior Notes.

          “Existing Notes Documents” means the Existing Convertible Debentures Documents, the Existing Senior Notes Documents, the Existing Subordinated Notes Documents and the New Senior Notes Documents.

          “Existing Notes Indentures” means the Existing Convertible Debentures Indenture, the Existing Senior Notes Indenture, the Existing Subordinated Notes Indenture and the New Senior Notes Indenture.

     (iii) The defined term “Prepayment Event” is hereby amended by amending and restating clause (d) thereof in its entirety as follows: “(d) the incurrence by the Borrower or any other Credit Party of any Permitted Subordinated Indebtedness or any New Senior Notes; or”.

          (b) Section 1.03 of the Credit Agreement is hereby amended by adding the following sentence at the end thereof:

“Notwithstanding any other provision contained herein, all terms of an accounting or financial nature used herein shall be construed, and all computations of amounts and ratios referred to herein shall be made, without giving effect to any election under Statement of Financial Accounting Standards No. 159 (and any other Financial Accounting Standard having a similar result or effect) to value any Indebtedness or other liabilities of the Borrower or any Subsidiary at “fair value”, as defined therein.”

          (c) Section 2.10 of the Credit Agreement is hereby amended by (i) the designation of the existing paragraph thereof as paragraph “(a)” and (ii) the insertion of the a new paragraph at the end thereof as follows:

   “(b) The Borrower agrees to pay to the Administrative Agent, for the account of each Lender, a fee (the “Duration Fee”) equal to 0.50% of the aggregate principal amount of the Loans of such Lender outstanding on June 30, 2009. The Duration Fees shall be payable on the first Business Day following June 30, 2009, in immediately available funds, and shall not be refundable under any circumstances absent manifest error (e.g., as a result of a clerical mistake).”

          (d) Section 6.03 of the Credit Agreement is hereby amended and restated in its entirety as follows:

     “SECTION 6.03. Total Debt Asset Coverage Ratio. The Borrower will not permit, as of the last day of any Fiscal Quarter, the ratio of (a) the sum of (i) the Proved PV-10 Value as of such day plus (ii) 50% of the BBEP Fair Market Value as of such day to (b) the Total Debt as of

such day to be less than the ratio set forth below opposite the period that includes such day:

Period		Ratio
June 30, 2009 to March 31, 2010		1.30 to 1.00
June 30, 2010 and thereafter		1.50 to 1.00”

          (e) Section 6.04 of the Credit Agreement is hereby amended is hereby amended and restated in its entirety as follows:

     “SECTION 6.04. Total Secured Debt Asset Coverage Ratio. The Borrower will not permit, as of the last day of any Fiscal Quarter, the ratio of (a) the sum of (i) the Proved PV-10 Value as of such day plus (ii) 50% of the BBEP Fair Market Value as of such day to (b) the Total Secured Debt as of such day to be less than the ratio set forth below opposite the period that includes such day:

Period		Ratio
September 30, 2008 through March 31, 2009		2.00 to 1.00
June 30, 2009 through March 31, 2010		1.60 to 1.00
June 30, 2010 through September 30, 2010		2.00 to 1.00
December 31, 2010 and thereafter		2.25 to 1.00”

          (f) Section 7.01 of the Credit Agreement is hereby amended (i) to delete the word “and” at the end of clause (p) thereof, (ii) to replace the period at the end of clause (q) thereof with “; and” and (iii) to add immediately after the end of clause (q) thereof the following new clause (r):

“(r) the New Senior Notes, provided that the Net Cash Proceeds thereof are applied in the manner required, and to the extent required, by Section 2.09(b) to prepay the Loans.”

(g) Section 7.13 of the Credit Agreement is hereby amended as follows:

     (i) by amending and restating clause (i) of the first proviso set forth therein in its entirety as follows:

“(i) so long as no Default or Event of Default has occurred and is continuing or would result therefrom, the Borrower or any other

Credit Party may, in connection with any refinancing of any Existing Notes (other than any New Senior Notes) or any Permitted Subordinated Indebtedness, or of any Refinancing Indebtedness in respect of any thereof, permitted by Section 7.01, prepay all or any portion of the principal of, and accrued interest and premiums, if any, on, any such Existing Notes, any Permitted Subordinated Indebtedness or any such Refinancing Indebtedness prior to the scheduled maturity thereof;”; and

     (ii) by amending and restating in its entirety the last sentence thereof as follows:

“Notwithstanding the foregoing, the provisions of this Section shall in no event or circumstance apply to or restrict any payment (whether in respect of a purchase, repurchase, redemption, defeasance, prepayment or otherwise) that the Borrower is obligated to make in respect of any Existing Senior Notes or any New Senior Notes; provided, however, that, except for any actions permitted under clause (i) or (iii) above, the Borrower will not, nor will the Borrower permit any other Credit Party to, take any action, or omit to take any action, if, as the direct result of such action or omission, any Existing Senior Notes or any New Senior Notes shall become due and payable prior to the scheduled maturity thereof.”.

          (h) Section 7.14 of the Credit Agreement is hereby amended by amending clause (i) of the first proviso set forth therein (i) to insert in subclause (C) thereof the phrase “(other than any New Senior Notes)” immediately after each reference to “the Existing Notes”, (ii) to replace the word “and” at the end of subclause (C) thereof with a comma, (iii) to renumber subclause (D) thereof as subclause (E) and (iv) to add immediately after the end of subclause (C) thereof the following new subclause (D):

“(D) restrictions and conditions imposed by any definitive agreements governing or evidencing any of the New Senior Notes, provided that the restrictions and conditions contained in any such definitive agreements are not materially less favorable to the Lenders, taken as a whole, than the restrictions and conditions imposed by the definitive agreements governing or evidencing the Existing Senior Notes as in effect on the date hereof, and”.

          (i) Section 10.16 of the Credit Agreement is hereby amended by replacing the phrase “Section 7.02 thereof” set forth therein with the phrase “Section 7.01 or 7.02 thereof”.

          SECTION 3. Concerning the New Senior Notes. (a) Each Lender party hereto acknowledges that the Borrower desires that obligations of the Borrower and the Subsidiaries under the New Senior Notes Documents be secured by Liens created under the Security Documents on substantially the same terms as such Liens secure obligations of the Borrower and the Subsidiaries under the Existing Senior Notes Documents. Each

Lender party hereto irrevocably (i) consents to such amendments, supplements or other modifications to the Security Documents as the Administrative Agent determines to be required or desired in order to secure thereunder obligations of the Borrower and the Subsidiaries under the New Senior Notes Documents on substantially the same terms as the obligations of the Borrower and the Subsidiaries under the Existing Senior Notes Documents are secured thereunder, and to provide to the New Senior Notes, and the holders thereof, all the other rights, powers and privileges that are provided for thereunder with respect to the Existing Senior Notes and the holders thereof, (ii) authorizes and directs the Administrative Agent to execute and deliver such agreement or agreements as shall effectuate such amendments, supplements or other modifications, in each case without any further consent, authorization or other action by such Lender, and (iii) agrees that such Lender shall not have any right of action whatsoever against the Administrative Agent as a result of any action taken by the Administrative Agent pursuant to this paragraph. Without limiting the foregoing, each Lender party hereto consents to (A) the amendment of the term “Secured Obligations” to include Indebtedness due with respect to the New Senior Notes and the Guarantees of the Subsidiaries in respect thereof and (B) the amendment of the term “Secured Parties” to include each holder of the New Senior Notes.

          (b) Each Lender party hereto acknowledges that, as a condition precedent under the First Lien Loan Documents to the issuance of the New Senior Notes, the Liens securing the New Senior Notes and the holders thereof are required to be subject to the terms of the Intercreditor Agreement. Each Lender party hereto irrevocably (i) consents to such amendments, supplements or other modifications to the Intercreditor Agreement as the Administrative Agent determines to be required or desired in order to subject the Liens securing the New Senior Notes, and the rights, powers and privileges of the holders of the New Senior Notes, to the provisions of the Intercreditor Agreement on substantially the same terms as such provisions apply to the Liens securing the Existing Senior Notes and the rights, powers and privileges of the holders of the Existing Senior Notes, (ii) authorizes and directs the Administrative Agent to execute and deliver such agreement or agreements as shall effectuate such amendments, supplements or other modifications, in each case without any further consent, authorization or other action by such Lender, and (iii) agrees that such Lender shall not have any right of action whatsoever against the Administrative Agent as a result of any action taken by the Administrative Agent pursuant to this paragraph.

          (c) The Administrative Agent shall have the benefit of the provisions of Article IX of the Credit Agreement with respect to all actions taken by it pursuant to this Section to the full extent thereof.

          (d) The Loans and other Term Obligations are hereby designated as “Senior Indebtedness” for purposes of the New Senior Notes Indenture.

          (e) The Lenders party hereto agree that, in respect of any Prepayment Event arising from the incurrence of any New Senior Notes, the Borrower shall be deemed to be in compliance with Section 2.09(e) so long as the Borrower shall have

given the notice contemplated by such Section in connection with such Prepayment Event on or prior to the Prepayment Date with respect thereto.

          SECTION 4. Representations and Warranties. The Borrower represents and warrants to the Administrative Agent and the Lenders that:

          (a) The execution, delivery and performance by the Borrower of this Amendment have been duly authorized by all necessary corporate or other organizational action on the part of the Borrower. This Amendment has been duly executed and delivered by the Borrower and this Amendment and the Credit Agreement, as amended by this Amendment, constitute legal, valid and binding obligations of the Borrower, enforceable against it in accordance with their terms, except as the enforceability thereof may be limited by (i) bankruptcy, insolvency, reorganization, moratorium, or similar Governmental Rules affecting creditors’ rights generally, and (ii) equitable principles of general applicability (whether enforcement is sought by proceedings at law or in equity).

          (b) The representations and warranties of the Borrower and the other Loan Parties set forth in the Credit Agreement and the other Loan Documents are true and correct in all material respects on and as of the Amendment Effective Date (as defined below), except in the case of any such representation or warranty that is made expressly as of an earlier date, in which case such representation or warranty is true and correct in all material respects on and as of such earlier date.

          (c) On and as of the Amendment Effective Date, no Default has occurred and is continuing.

          SECTION 5. Amendment Fees. The Borrower agrees to pay to the Administrative Agent, for the account of each Lender that executes and delivers a copy of this Amendment to the Administrative Agent (or its counsel) at or prior to 5:00 p.m., New York City time, on June 3, 2009, an amendment fee (collectively, the “Amendment Fees”) in an amount equal to 0.25% of the aggregate principal amount of the Loans of such Lender outstanding on such date. The Amendment Fees shall be payable in immediately available funds on, and subject to the occurrence of, the Amendment Effective Date.

          SECTION 6. Conditions to Effectiveness. This Amendment shall become effective on and as of the date on which each of the following conditions precedent is satisfied (such date, the “Amendment Effective Date”):

          (a) The Administrative Agent (or its counsel) shall have received either signed counterparts of this Amendment or written evidence satisfactory to the Administrative Agent (which may include facsimile or other customary electronic transmission acceptable to the Administrative Agent of a signed signature page of this Amendment) that, when taken together, bear the authorized signatures of the Borrower and the Required Lenders.

          (b) The Administrative Agent shall have received such documents and certificates as the Administrative Agent or its counsel may reasonably request relating to

the authorization of the transactions contemplated hereby and any other legal matters relating to the Borrower, the Loan Documents or the transactions contemplated hereby, all in form and substance reasonably satisfactory to the Administrative Agent.

          (c) The representations and warranties of the Borrower set forth in Section 4 hereof shall be true and correct as of the Amendment Effective Date, and the Administrative Agent shall have received a certificate, dated the Amendment Effective Date and signed by the Chief Executive Officer or a Financial Officer of the Borrower, confirming the accuracy thereof, which shall be in form and substance reasonably satisfactory to the Administrative Agent.

          (d) The Administrative Agent shall have received the Amendment Fees and all fees payable to the Administrative Agent or any Affiliate thereof pursuant to that certain engagement letter entered into in connection with this Amendment that are required to be paid on or before the Amendment Effective Date and all amounts required to be paid to the Administrative Agent or any Affiliate thereof in accordance with any Loan Document on or prior to the Amendment Effective Date, including reimbursement or payment of all reasonable out-of-pocket expenses (including reasonable fees, charges and disbursements of counsel) required to be reimbursed or paid by any Loan Party under any Loan Document.

          SECTION 7. Effect of Amendment. (a) Except as expressly set forth herein, this Amendment shall not by implication or otherwise limit, impair, constitute a waiver of or otherwise affect the rights and remedies of the Lenders, the Administrative Agent (or any sub-agent thereof) or the Arrangers under the Credit Agreement or any other Loan Document, and shall not alter, modify, amend or in any way affect any of the terms, conditions, obligations, covenants or agreements contained in the Credit Agreement or any other Loan Document, all of which are ratified and affirmed in all respects and shall continue in full force and effect. Nothing herein shall be deemed to entitle any Loan Party to a consent to, or a waiver, amendment, modification or other change of, any of the terms, conditions, obligations, covenants or agreements contained in the Credit Agreement or any other Loan Document in similar or different circumstances.

          (b) On and after the Amendment Effective Date, each reference in the Credit Agreement to “this Agreement”, “hereunder”, “hereof”, “herein”, or words of like import, and each reference to the Credit Agreement in any other Loan Document shall be deemed to be a reference to the Credit Agreement as amended hereby. This Amendment shall constitute a “Loan Document” for all purposes of the Credit Agreement and the other Loan Documents.

          SECTION 8. Governing Law. THIS AMENDMENT SHALL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK.

          SECTION 9. 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 facsimile or other electronic imaging shall be as effective as delivery of a manually executed counterpart of this Amendment.

          SECTION 10. Headings. 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.

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          IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be duly executed by their respective authorized officers as of the day and year first written above.

		QUICKSILVER RESOURCES INC.,
		by		/s/ MarLu S. Hiller
				Name: MarLu S. Hiller
				Title: Vice President — Treasurer

				CREDIT SUISSE, CAYMAN ISLANDS BRANCH, individually and as Administrative Agent,
		by		/s/ Vanessa Gomez
				Name: Vanessa Gomez
				Title: Director
		by		/s/ Mikhail Faybusovich
				Name: Mikhail Faybusovich
				Title: Vice President

SIGNATURE PAGE TO AMENDMENT NO 1. TO
CREDIT AGREEMENT DATED AS OF AUGUST 8, 2008, OF
QUICKSILVER RESOURCES INC.

Name of Lender:		LOOMIS SAYLES CLO I, LTD.
by		Loomis, Sayles and Company, L.P., its Collateral Manager
by		Loomis, Sayles and Company, Inc., its General Partner
		/s/ Kevin P. Charleston
		Name: Kevin P. Charleston
		Title: Executive Vice President

SIGNATURE PAGE TO AMENDMENT NO 1. TO
CREDIT AGREEMENT DATED AS OF AUGUST 8, 2008, OF
QUICKSILVER RESOURCES INC.

Name of Lender:		AMMC CLO III, LIMITED
by		American Money Management Corp., as Collateral Manager
		/s/ Chester M. Eng
		Name: Chester M. Eng
		Title: Senior Vice President

SIGNATURE PAGE TO AMENDMENT NO 1. TO
CREDIT AGREEMENT DATED AS OF AUGUST 8, 2008, OF
QUICKSILVER RESOURCES INC.

Name of Lender:		AMMC CLO IV, LIMITED
by		American Money Management Corp., as Collateral Manager
		/s/ Chester M. Eng
		Name: Chester M. Eng
		Title: Senior Vice President

SIGNATURE PAGE TO AMENDMENT NO 1. TO
CREDIT AGREEMENT DATED AS OF AUGUST 8, 2008, OF
QUICKSILVER RESOURCES INC.

Name of Lender:		PUTNAM HIGH YIELD TRUST
by		/s/ Beth Mazor
		Name: Beth Mazor
		Title: VP

SIGNATURE PAGE TO AMENDMENT NO 1. TO
CREDIT AGREEMENT DATED AS OF AUGUST 8, 2008, OF
QUICKSILVER RESOURCES INC.

Name of Lender:		PUTNAM VARIABLE TRUST — PVT DIVERSIFIED INCOME FUND
by		/s/ Beth Mazor
		Name: Beth Mazor
		Title: VP

SIGNATURE PAGE TO AMENDMENT NO 1. TO
CREDIT AGREEMENT DATED AS OF AUGUST 8, 2008, OF
QUICKSILVER RESOURCES INC.

Name of Lender:		INTERPOLIS PENSIOENEN GLOBAL HIGH YIELD POOL
by		/s/ Angela Patel
		Name: Angela Patel
		Title: Vice President

SIGNATURE PAGE TO AMENDMENT NO 1. TO
CREDIT AGREEMENT DATED AS OF AUGUST 8, 2008, OF
QUICKSILVER RESOURCES INC.

Name of Lender:		PUTNAM HIGH YIELD ADVANTAGE FUND
by		/s/ Beth Mazor
		Name: Beth Mazor
		Title: VP

SIGNATURE PAGE TO AMENDMENT NO 1. TO
CREDIT AGREEMENT DATED AS OF AUGUST 8, 2008, OF
QUICKSILVER RESOURCES INC.

Name of Lender:		PUTNAM ASSET ALLOCATION FUND: BALANCED PORTFOLIO
by		/s/ Suzanne Deshaies
		Name: Suzanne Deshaies
		Title: Vice President

SIGNATURE PAGE TO AMENDMENT NO 1. TO
CREDIT AGREEMENT DATED AS OF AUGUST 8, 2008, OF
QUICKSILVER RESOURCES INC.

Name of Lender:		PUTNAM FLOATING RATE INCOME FUND
by		/s/ Beth Mazor
		Name: Beth Mazor
		Title: V.P.

SIGNATURE PAGE TO AMENDMENT NO 1. TO
CREDIT AGREEMENT DATED AS OF AUGUST 8, 2008, OF
QUICKSILVER RESOURCES INC.

Name of Lender:		PUTNAM DIVERSIFIED INCOME TRUST (CAYMAN) MASTER FUND
by		/s/ Angela Patel
		Name: Angela Patel
		Title: Vice President

SIGNATURE PAGE TO AMENDMENT NO 1. TO
CREDIT AGREEMENT DATED AS OF AUGUST 8, 2008, OF
QUICKSILVER RESOURCES INC.

Name of Lender:		THE PUTNAM ADVISORY COMPANY, LLC ON BEHALF OF PUTNAM GLOBAL FUNDS — PUTNAM WORLDWIDE INCOME FUND
by		/s/ Lauren Silk
		Name: Lauren Silk
		Title: Vice President

SIGNATURE PAGE TO AMENDMENT NO 1. TO
CREDIT AGREEMENT DATED AS OF AUGUST 8, 2008, OF
QUICKSILVER RESOURCES INC.

Name of Lender:		PUTNAM PREMIER INCOME TRUST
by		/s/ Beth Mazor
		Name: Beth Mazor
		Title: Vice President

SIGNATURE PAGE TO AMENDMENT NO 1. TO
CREDIT AGREEMENT DATED AS OF AUGUST 8, 2008, OF
QUICKSILVER RESOURCES INC.

Name of Lender:		PUTNAM MASTER INTERMEDIATE INCOME TRUST
by		/s/ Beth Mazor
		Name: Beth Mazor
		Title: Vice President

SIGNATURE PAGE TO AMENDMENT NO 1. TO
CREDIT AGREEMENT DATED AS OF AUGUST 8, 2008, OF
QUICKSILVER RESOURCES INC.

Name of Lender:		PUTNAM VARIABLE TRUST — PUTNAM VT GLOBAL ASSET ALLOCATION FUND
by		Putnam Investment Management, LLC
		/s/ Lauren Silk
		Name: Lauren Silk
		Title: Vice President

SIGNATURE PAGE TO AMENDMENT NO 1. TO
CREDIT AGREEMENT DATED AS OF AUGUST 8, 2008, OF
QUICKSILVER RESOURCES INC.

Name of Lender:		PUTNAM DIVERSIFIED INCOME TRUST
by		/s/ Beth Mazor
		Name: Beth Mazor
		Title:   Vice President

SIGNATURE PAGE TO AMENDMENT NO 1. TO
CREDIT AGREEMENT DATED AS OF AUGUST 8, 2008, OF
QUICKSILVER RESOURCES INC.

Name of Lender:		PUTNAM TOTAL RETURN TRUST
by		Putnam Investment Management LLC
by		/s/ Suzanne Deshaies
		Name: Suzanne Deshaies
		Title:   Vice President

SIGNATURE PAGE TO AMENDMENT NO 1. TO
CREDIT AGREEMENT DATED AS OF AUGUST 8, 2008, OF
QUICKSILVER RESOURCES INC.

Name of Lender:		PUTNAM RETIREMENT ADVANTAGE GAA BALANCE PORTFOLIO
by		Putnam Investment Management LLC
by		/s/ Suzanne Deshaies
		Name: Suzanne Deshaies
		Title:   Vice President

SIGNATURE PAGE TO AMENDMENT NO 1. TO
CREDIT AGREEMENT DATED AS OF AUGUST 8, 2008, OF
QUICKSILVER RESOURCES INC.

Name of Lender:		PUTNAM RETIREMENT ADVANTAGE GAA GROWTH PORTFOLIO
by		Putnam Investment Management, LLC
by		/s/ Suzanne Deshaies
		Name: Suzanne Deshaies
		Title:   Vice President

SIGNATURE PAGE TO AMENDMENT NO 1. TO
CREDIT AGREEMENT DATED AS OF AUGUST 8, 2008, OF
QUICKSILVER RESOURCES INC.

Name of Lender:		THE PUTNAM ADVISORY COMPANY, LLC ON BEHALF OF IG PUTNAM HIGH YIELD INCOME FUND
by		/s/ Suzanne Deshaies
		Name: Suzanne Deshaies
		Title:   Vice President

SIGNATURE PAGE TO AMENDMENT NO 1. TO
CREDIT AGREEMENT DATED AS OF AUGUST 8, 2008, OF
QUICKSILVER RESOURCES INC.

Name of Lender:		PUTNAM VARIABLE TRUST — PVT HIGH YIELD FUND
by		/s/ Beth Mazor
		Name: Beth Mazor
		Title:   Vice President

SIGNATURE PAGE TO AMENDMENT NO 1. TO
CREDIT AGREEMENT DATED AS OF AUGUST 8, 2008, OF
QUICKSILVER RESOURCES INC.

Name of Lender:		THE PUTNAM ADVISORY COMPANY, LLC ON BEHALF OF STICHTING PENSIOENFONDS VOOR FYSIOTHERAPEUTEN
by		/s/ Suzanne Deshaies
		Name: Suzanne Deshaies
		Title:   Vice President

SIGNATURE PAGE TO AMENDMENT NO 1. TO
CREDIT AGREEMENT DATED AS OF AUGUST 8, 2008, OF
QUICKSILVER RESOURCES INC.

Name of Lender:		ANCHORAGE CROSSOVER CREDIT FINANCE, LTD
by		Anchorage Advisors, L.L.C., its Investment Manager
		/s/ Daniel Allen
		Name: Daniel Allen
		Title:   Senior Portfolio Manager
Name of Lender:		PCI FUND L.L.C.
by		Anchorage Advisors, L.L.C., its Investment Manager
		/s/ Daniel Allen
		Name: Daniel Allen
		Title:   Senior Portfolio Manager

SIGNATURE PAGE TO AMENDMENT NO 1. TO
CREDIT AGREEMENT DATED AS OF AUGUST 8, 2008, OF
QUICKSILVER RESOURCES INC.

Name of Lender:		GRAND CENTRAL ASSET TRUST, LBAM SERIES
by		/s/ Adam Jacobs
		Name: Adam Jacobs
		Title:   Attorney-in-Fact

SIGNATURE PAGE TO AMENDMENT NO 1. TO
CREDIT AGREEMENT DATED AS OF AUGUST 8, 2008, OF
QUICKSILVER RESOURCES INC.

Name of Lender:		LIGHTPOINT CLO 2004-1, LTD.
by		/s/ Colin Donlan
		Name: Colin Donlan
		Title:   Authorized Signatory

SIGNATURE PAGE TO AMENDMENT NO 1. TO
CREDIT AGREEMENT DATED AS OF AUGUST 8, 2008, OF
QUICKSILVER RESOURCES INC.

Name of Lender:		LIGHTPOINT CLO III, LTD.
by		/s/ Colin Donlan
		Name: Colin Donlan
		Title:   Authorized Signatory

SIGNATURE PAGE TO AMENDMENT NO 1. TO
CREDIT AGREEMENT DATED AS OF AUGUST 8, 2008, OF
QUICKSILVER RESOURCES INC.

Name of Lender:		LIGHTPOINT CLO IV, LTD.
by		/s/ Colin Donlan
		Name: Colin Donlan
		Title:   Authorized Signatory

SIGNATURE PAGE TO AMENDMENT NO 1. TO
CREDIT AGREEMENT DATED AS OF AUGUST 8, 2008, OF
QUICKSILVER RESOURCES INC.

Name of Lender:		LIGHTPOINT CLO V, LTD.
by		/s/ Colin Donlan
		Name: Colin Donlan
		Title:   Authorized Signatory

SIGNATURE PAGE TO AMENDMENT NO 1. TO
CREDIT AGREEMENT DATED AS OF AUGUST 8, 2008, OF
QUICKSILVER RESOURCES INC.

Name of Lender:		LIGHTPOINT CLO VIII LTD.
by		/s/ Colin Donlan
		Name: Colin Donlan
		Title:   Authorized Signatory

SIGNATURE PAGE TO AMENDMENT NO 1. TO
CREDIT AGREEMENT DATED AS OF AUGUST 8, 2008, OF
QUICKSILVER RESOURCES INC.

Name of Lender:		ARLIE CLO 2006-I, LTD.
by		/s/ Colin Donlan
		Name: Colin Donlan
		Title:   Authorized Signatory

SIGNATURE PAGE TO AMENDMENT NO 1. TO
CREDIT AGREEMENT DATED AS OF AUGUST 8, 2008, OF
QUICKSILVER RESOURCES INC.

Name of Lender:		ALTICOR INC.
by		/s/ Colin Donlan
		Name: Colin Donlan
		Title:   Authorized Signatory

SIGNATURE PAGE TO AMENDMENT NO 1. TO
CREDIT AGREEMENT DATED AS OF AUGUST 8, 2008, OF
QUICKSILVER RESOURCES INC.

Name of Lender:		NEUBERGER BERMAN HIGH INCOME BOND FUND
by		/s/ Colin Donlan
		Name: Colin Donlan
		Title:   Authorized Signatory

SIGNATURE PAGE TO AMENDMENT NO 1. TO
CREDIT AGREEMENT DATED AS OF AUGUST 8, 2008, OF
QUICKSILVER RESOURCES INC.

Name of Lender:		NEUBERGER BERMAN INCOME OPPORTUNITY FUND, INC.
by		/s/ Colin Donlan
		Name: Colin Donlan
		Title:   Authorized Signatory

SIGNATURE PAGE TO AMENDMENT NO 1. TO
CREDIT AGREEMENT DATED AS OF AUGUST 8, 2008, OF
QUICKSILVER RESOURCES INC.

Name of Lender:		OHIO POLICE & FIRE PENSION FUND
by		/s/ Colin Donlan
		Name: Colin Donlan
		Title:   Authorized Signatory

SIGNATURE PAGE TO AMENDMENT NO 1. TO
CREDIT AGREEMENT DATED AS OF AUGUST 8, 2008, OF
QUICKSILVER RESOURCES INC.

Name of Lender:		PLUMBERS & PIPEFITTER NATIONAL PENSION FUND
by		/s/ Colin Donlan
		Name: Colin Donlan
		Title:   Authorized Signatory

SIGNATURE PAGE TO AMENDMENT NO 1. TO
CREDIT AGREEMENT DATED AS OF AUGUST 8, 2008, OF
QUICKSILVER RESOURCES INC.

Name of Lender:		PRINCIPAL INVESTORS FUND, INC — HIGH YIELD FUND
by		/s/ Colin Donlan
		Name: Colin Donlan
		Title:   Authorized Signatory

SIGNATURE PAGE TO AMENDMENT NO 1. TO
CREDIT AGREEMENT DATED AS OF AUGUST 8, 2008, OF
QUICKSILVER RESOURCES INC.

Name of Lender:		GMAM INVESTMENT FUNDS TRUST
by		/s/ Colin Donlan
		Name: Colin Donlan
		Title:   Authorized Signatory

SIGNATURE PAGE TO AMENDMENT NO 1. TO
CREDIT AGREEMENT DATED AS OF AUGUST 8, 2008, OF
QUICKSILVER RESOURCES INC.

Name of Lender:		LEHMAN BROTHERS FIRST TRUST INCOME OPPORTUNITY FUND
by		/s/ Colin Donlan
		Name: Colin Donlan
		Title:   Authorized Signatory

SIGNATURE PAGE TO AMENDMENT NO 1. TO
CREDIT AGREEMENT DATED AS OF AUGUST 8, 2008, OF
QUICKSILVER RESOURCES INC.

Name of Lender:		NORTHWOODS CAPITAL IV, LIMITED
by		Angelo, Gordon & Co. L.P., as Collateral Manager
		/s/ Bruce Martin
		Name: Bruce Martin
		Title:   Managing Director
Name of Lender:		NORTHWOODS CAPITAL V, LIMITED
by		Angelo, Gordon & Co. L.P., as Collateral Manager
		/s/ Bruce Martin
		Name: Bruce Martin
		Title:   Managing Director

SIGNATURE PAGE TO AMENDMENT NO 1. TO
CREDIT AGREEMENT DATED AS OF AUGUST 8, 2008, OF
QUICKSILVER RESOURCES INC.

Name of Lender:		NORTHWOODS CAPITAL VI, LIMITED
by		Angelo, Gordon & Co. L.P., as Collateral Manager
		/s/ Bruce Martin
		Name: Bruce Martin
		Title:   Managing Director
Name of Lender:		NORTHWOODS CAPITAL VII, LIMITED
by		Angelo, Gordon & Co. L.P., as Collateral Manager
		/s/ Bruce Martin
		Name: Bruce Martin
		Title:   Managing Director

SIGNATURE PAGE TO AMENDMENT NO 1. TO
CREDIT AGREEMENT DATED AS OF AUGUST 8, 2008, OF
QUICKSILVER RESOURCES INC.

Name of Lender:		AG DIVERSIFIED CREDIT STRATEGIES MASTER, L.P.
by		AG Diversified Credit Strategies GP, LLC, its General Partner
by		Angelo, Gordon & Co. L.P., its Manager
		/s/ Bruce Martin
		Name: Bruce Martin
		Title:   Managing Director
Name of Lender:		JRG REINSURANCE COMPANY, LTD.
by		Angelo, Gordon & Co. L.P., as Investment Manager
by		/s/ Bruce Martin
		Name: Bruce Martin
		Title:   Managing Director

SIGNATURE PAGE TO AMENDMENT NO 1. TO
CREDIT AGREEMENT DATED AS OF AUGUST 8, 2008, OF
QUICKSILVER RESOURCES INC.

Name of Lender:		BLACKSTONE SPECIAL FUNDING (IRELAND) GSO CAPITOL PARTNERS LP, its Manager
by		/s/ George Fan
		Name: George Fan
		Title:   Attorney-in-Fact

SIGNATURE PAGE TO AMENDMENT NO 1. TO
CREDIT AGREEMENT DATED AS OF AUGUST 8, 2008, OF
QUICKSILVER RESOURCES INC.

Name of Lender:		CENTRAL STATES, S.E. & S.W. AREAS PENSION FUND
by		/s/ Beth Semmel
		Name: Beth Semmel
		Title:   Portfolio Manager

SIGNATURE PAGE TO AMENDMENT NO 1. TO
CREDIT AGREEMENT DATED AS OF AUGUST 8, 2008, OF
QUICKSILVER RESOURCES INC.

Name of Lender:		STONE HARBOR HIGH YIELD BOND FUND
by		/s/ Beth Semmel
		Name: Beth Semmel
		Title:   Portfolio Manager

SIGNATURE PAGE TO AMENDMENT NO 1. TO
CREDIT AGREEMENT DATED AS OF AUGUST 8, 2008, OF
QUICKSILVER RESOURCES INC.

Name of Lender:		LIBRA GLOBAL LIMITED
by		/s/ Beth Semmel
		Name: Beth Semmel
		Title:   Portfolio Manager

SIGNATURE PAGE TO AMENDMENT NO 1. TO
CREDIT AGREEMENT DATED AS OF AUGUST 8, 2008, OF
QUICKSILVER RESOURCES INC.

Name of Lender:		LOYALIS SCHADE NV
by		/s/ Beth Semmel
		Name: Beth Semmel
		Title:   Portfolio Manager

SIGNATURE PAGE TO AMENDMENT NO 1. TO
CREDIT AGREEMENT DATED AS OF AUGUST 8, 2008, OF
QUICKSILVER RESOURCES INC.

Name of Lender:		MULTI MANAGER PROGRAMMES PCC LIMITED GLOBAL HIGH YIELD MASTER FUND
by		/s/ Beth Semmel
		Name: Beth Semmel
		Title:   Portfolio Manager

SIGNATURE PAGE TO AMENDMENT NO 1. TO
CREDIT AGREEMENT DATED AS OF AUGUST 8, 2008, OF
QUICKSILVER RESOURCES INC.

Name of Lender:		NEW YORK TIMES COMPANY PENSION TRUST
by		/s/ Beth Semmel
		Name: Beth Semmel
		Title:   Portfolio Manager

SIGNATURE PAGE TO AMENDMENT NO 1. TO
CREDIT AGREEMENT DATED AS OF AUGUST 8, 2008, OF
QUICKSILVER RESOURCES INC.

Name of Lender:		COMMONWEALTH OF PENNSYLVANIA STATE EMPLOYEES RETIREMENT SYSTEM
by		/s/ Beth Semmel
		Name: Beth Semmel
		Title:   Portfolio Manager

SIGNATURE PAGE TO AMENDMENT NO 1. TO
CREDIT AGREEMENT DATED AS OF AUGUST 8, 2008, OF
QUICKSILVER RESOURCES INC.

Name of Lender:		STONE HARBOR LEVERAGED LOAN PORTFOLIO
by		/s/ Beth Semmel
		Name: Beth Semmel
		Title:   Portfolio Manager

SIGNATURE PAGE TO AMENDMENT NO 1. TO
CREDIT AGREEMENT DATED AS OF AUGUST 8, 2008, OF
QUICKSILVER RESOURCES INC.

Name of Lender:		SAN JOAQUIN COUNTY EMPLOYEES’ RETIREMENT ASSOCIATION
by		/s/ Beth Semmel
		Name: Beth Semmel
		Title:   Portfolio Manager

SIGNATURE PAGE TO AMENDMENT NO 1. TO
CREDIT AGREEMENT DATED AS OF AUGUST 8, 2008, OF
QUICKSILVER RESOURCES INC.

Name of Lender:		STONE HARBOR INVEST FUNDS PLC — STONE HARBOR HIGH YIELD BOND FUND
by		/s/ Beth Semmel
		Name: Beth Semmel
		Title:   Portfolio Manager

SIGNATURE PAGE TO AMENDMENT NO 1. TO
CREDIT AGREEMENT DATED AS OF AUGUST 8, 2008, OF
QUICKSILVER RESOURCES INC.

Name of Lender:		UBS (UK) PENSION AND LIFE ASSURANCE SCHEME
by		/s/ Beth Semmel
		Name: Beth Semmel
		Title:   Portfolio Manager

SIGNATURE PAGE TO AMENDMENT NO 1. TO
CREDIT AGREEMENT DATED AS OF AUGUST 8, 2008, OF
QUICKSILVER RESOURCES INC.

Name of Lender:		REGENTS OF THE UNIVERSITY OF CALIFORNIA
by		/s/ Beth Semmel
		Name: Beth Semmel
		Title:   Portfolio Manager

SIGNATURE PAGE TO AMENDMENT NO 1. TO
CREDIT AGREEMENT DATED AS OF AUGUST 8, 2008, OF
QUICKSILVER RESOURCES INC.

Name of Lender:		VIRGINIA RETIREMENT SYSTEM
by		/s/ Beth Semmel
		Name: Beth Semmel
		Title:   Portfolio Manager

SIGNATURE PAGE TO AMENDMENT NO 1. TO
CREDIT AGREEMENT DATED AS OF AUGUST 8, 2008, OF
QUICKSILVER RESOURCES INC.

Name of Lender:		WELLS FARGO & COMPANY MASTER PENSION TRUST
by		/s/ Beth Semmel
		Name: Beth Semmel
		Title:   Portfolio Manager

SIGNATURE PAGE TO AMENDMENT NO 1. TO
CREDIT AGREEMENT DATED AS OF AUGUST 8, 2008, OF
QUICKSILVER RESOURCES INC.

Name of Lender:		GALE FORCE 1 CLO, LTD.
by		GSO/Blackstone Debt Funds Management LLC, as Collateral Manager
		/s/ Daniel H. Smith
		Name: Daniel H. Smith
		Title:   Authorized Signatory

SIGNATURE PAGE TO AMENDMENT NO 1. TO
CREDIT AGREEMENT DATED AS OF AUGUST 8, 2008, OF
QUICKSILVER RESOURCES INC.

Name of Lender:		GALE FORCE 2 CLO, LTD.
by		GSO/Blackstone Debt Funds Management LLC, as Collateral Manager
		/s/ Daniel H. Smith
		Name: Daniel H. Smith
		Title:   Authorized Signatory

SIGNATURE PAGE TO AMENDMENT NO 1. TO
CREDIT AGREEMENT DATED AS OF AUGUST 8, 2008, OF
QUICKSILVER RESOURCES INC.

Name of Lender:		GALE FORCE 3 CLO, LTD.
by		GSO/Blackstone Debt Funds Management LLC, as Collateral Manager
		/s/ Daniel H. Smith
		Name: Daniel H. Smith
		Title:   Authorized Signatory

SIGNATURE PAGE TO AMENDMENT NO 1. TO
CREDIT AGREEMENT DATED AS OF AUGUST 8, 2008, OF
QUICKSILVER RESOURCES INC.

Name of Lender:		GALE FORCE 4 CLO, LTD.
by		GSO/Blackstone Debt Funds Management LLC, as Collateral Manager
		/s/ Daniel H. Smith
		Name: Daniel H. Smith
		Title:   Authorized Signatory

SIGNATURE PAGE TO AMENDMENT NO 1. TO
CREDIT AGREEMENT DATED AS OF AUGUST 8, 2008, OF
QUICKSILVER RESOURCES INC.

Name of Lender:		CHELSEA PARK CLO LTD.
by		GSO/Blackstone Debt Funds Management LLC, as Collateral Manager
		/s/ Daniel H. Smith
		Name: Daniel H. Smith
		Title:   Authorized Signatory

SIGNATURE PAGE TO AMENDMENT NO 1. TO
CREDIT AGREEMENT DATED AS OF AUGUST 8, 2008, OF
QUICKSILVER RESOURCES INC.

Name of Lender:		COLUMBUS PARK CDO LTD.
by		GSO/Blackstone Debt Funds Management LLC, as Collateral Manager
		/s/ Daniel H. Smith
		Name: Daniel H. Smith
		Title:   Authorized Signatory

SIGNATURE PAGE TO AMENDMENT NO 1. TO
CREDIT AGREEMENT DATED AS OF AUGUST 8, 2008, OF
QUICKSILVER RESOURCES INC.

Name of Lender:		JACKSON SQUARE CLO LTD.
by		GSO/Blackstone Debt Funds Management LLC, as Collateral Manager
		/s/ Daniel H. Smith
		Name: Daniel H. Smith
		Title:   Authorized Signatory

SIGNATURE PAGE TO AMENDMENT NO 1. TO
CREDIT AGREEMENT DATED AS OF AUGUST 8, 2008, OF
QUICKSILVER RESOURCES INC.

Name of Lender:		LAFAYETTE SQUARE CDO LTD.
by		Blackstone Debt Advisors L.P., as Collateral Manager
		/s/ Dean T. Criares
		Name: Dean T. Criares
		Title:   Authorized Signatory

SIGNATURE PAGE TO AMENDMENT NO 1. TO
CREDIT AGREEMENT DATED AS OF AUGUST 8, 2008, OF
QUICKSILVER RESOURCES INC.

Name of Lender:		UNION SQUARE CDO LTD.
by		Blackstone Debt Advisors L.P., as Collateral Manager
		/s/ Dean T. Criares
		Name: Dean T. Criares
		Title:   Authorized Signatory

SIGNATURE PAGE TO AMENDMENT NO 1. TO
CREDIT AGREEMENT DATED AS OF AUGUST 8, 2008, OF
QUICKSILVER RESOURCES INC.

Name of Lender:		HIGH YIELD BOND COMMON TRUST FUND (CMN1)
by		/s/ Kali Ramachandran
		Name: Kali Ramachandran
		Title:   Vice President

SIGNATURE PAGE TO AMENDMENT NO 1. TO
CREDIT AGREEMENT DATED AS OF AUGUST 8, 2008, OF
QUICKSILVER RESOURCES INC.

Name of Lender:		PUTNAM INVESTMENT MANAGEMENT LLC, on behalf of its series, ASSET ALLOCATION CONSERVATIVE
by		PUTNAM INVESTMENT MANAGEMENT, LLC
		/s/ Suzanne Deshaies
		Name: Suzanne Deshaies
		Title:   Vice President

SIGNATURE PAGE TO AMENDMENT NO 1. TO
CREDIT AGREEMENT DATED AS OF AUGUST 8, 2008, OF
QUICKSILVER RESOURCES INC.

Name of Lender:		SILVER LAKE CREDIT FUND, L.P.
by		SILVER LAKE FINANCIAL ASSOCIATES, L.P., its General Partner
		/s/ Roger Wittlin
		Name: Roger Wittlin
		Title:   Managing Director

SIGNATURE PAGE TO AMENDMENT NO 1. TO
CREDIT AGREEMENT DATED AS OF AUGUST 8, 2008, OF
QUICKSILVER RESOURCES INC.

Name of Lender:		OREGON PUBLIC EMPLOYEES RETIREMENT FUND
by		/s/ Sue Wawreycki
		Name: Sue Wawreycki
		Title:   Authorized Signatory
Name of Lender:		KKR FI PARTNERS I, LP
by		/s/ Sue Wawreycki
		Name: Sue Wawreycki
		Title:   Authorized Signatory

SIGNATURE PAGE TO AMENDMENT NO 1. TO
CREDIT AGREEMENT DATED AS OF AUGUST 8, 2008, OF
QUICKSILVER RESOURCES INC.

Name of Lender:		NUVEEN FLOATING RATE INCOME FUND
by		Symphony Asset Management, LLC
		/s/ James Kim
		Name: James Kim
		Title:   Associate Portfolio Manager

SIGNATURE PAGE TO AMENDMENT NO 1. TO
CREDIT AGREEMENT DATED AS OF AUGUST 8, 2008, OF
QUICKSILVER RESOURCES INC.

Name of Lender:		NUVEEN SENIOR INCOME FUND
by		Symphony Asset Management, LLC
		/s/ James Kim
		Name: James Kim
		Title:   Associate Portfolio Manager

SIGNATURE PAGE TO AMENDMENT NO 1. TO
CREDIT AGREEMENT DATED AS OF AUGUST 8, 2008, OF
QUICKSILVER RESOURCES INC.

Name of Lender:		ARES ENHANCED CREDIT OPPORTUNITIES FUND LTD.
by		Ares Enhanced Credit Opportunities Fund Management, L.P,
		/s/ Americo Cascella
		Name: Americo Cascella
		Title:   Authorized Signatory
Name of Lender:		ARES ENHANCED LOAN INVESTMENT STRATEGY IR LTD.
by		Ares Enhanced Loan Management IR, L.P., as Portfolio Manager
by		Ares Enhanced Loan IR GP, LLC, as its General Partner
by		Ares Management LLC, as its Manager
		/s/ Americo Cascella
		Name: Americo Cascella
		Title:   Authorized Signatory
Name of Lender:		ARES INSTITUTIONAL LOAN FUND B.V.
by		Ares Management Limited, its Investment Advisor
		/s/ Americo Cascella
		Name: Americo Cascella
		Title:   Authorized Signatory

SIGNATURE PAGE TO AMENDMENT NO 1. TO
CREDIT AGREEMENT DATED AS OF AUGUST 8, 2008, OF
QUICKSILVER RESOURCES INC.

Name of Lender:		ARES XII CLO LTD.
by		Ares CLO Management XII, L.P.
by		Ares CLO GP XII, LLC, its General Partner
by		Ares Management LLC, its Manger
		/s/ Americo Cascella
		Name: Americo Cascella
		Title:   Authorized Signatory
Name of Lender:		ARES ENHANCED LOAN INVESTMENT STRATEGY II, LTD.
by		Ares Enhanced Loan Management II, L.P., Investment Manager
by		Ares Enhanced Loan GP II, LLC, its General Partner
		/s/ Americo Cascella
		Name: Americo Cascella
		Title:   Authorized Signatory
Name of Lender:		FUTURE FUND BOARD OF GUARDIANS
by		Ares Enhanced Loan Investment Strategy Advisor IV, L.P., its Investment Manager
by		Ares Enhanced Loan Investment Strategy Advisor IV, LLC., its General Partner

SIGNATURE PAGE TO AMENDMENT NO 1. TO
CREDIT AGREEMENT DATED AS OF AUGUST 8, 2008, OF
QUICKSILVER RESOURCES INC.

by		Ares Management LLC, its Managing Member
		/s/ Americo Cascella
		Name: Americo Cascella
		Title:   Authorized Signatory
Name of Lender:		ARES XI CLO LTD.
by		Ares CLO Management XI, L.P.
by		Ares CLO GP XI, LLC, its General Partner
by		Ares Management LLC, its Manager
		/s/ Americo Cascella
		Name: Americo Cascella
		Title:   Authorized Signatory
Name of Lender:		ARES X CLO LTD.
by		Ares CLO Management X, L.P., Investment Manager
by		Ares CLO GP X, LLC, its General Partner
		/s/ Americo Cascella
		Name: Americo Cascella
		Title:   Authorized Signatory

SIGNATURE PAGE TO AMENDMENT NO 1. TO
CREDIT AGREEMENT DATED AS OF AUGUST 8, 2008, OF
QUICKSILVER RESOURCES INC.

Name of Lender:		ARES IIR CLO LTD.
by		Ares CLO Management IIR, L.P., Investment Manager
by		Ares CLO GP IIR, LLC, its General Partner
		/s/ Americo Cascella
		Name: Americo Cascella
		Title:   Authorized Signatory
Name of Lender:		ARES VR CLO LTD.
by		Ares CLO Management VR, L.P., Investment Manager
by		Ares CLO GP VR, LLC, its General Partner
		/s/ Americo Cascella
		Name: Americo Cascella
		Title:   Authorized Signatory
Name of Lender:		ARES VIII CLO LTD.
by		Ares CLO Management VIII, L.P., Investment Manager
by		Ares CLO GP VIII, LLC, its General Partner
		/s/ Americo Cascella
		Name: Americo Cascella
		Title:   Authorized Signatory

SIGNATURE PAGE TO AMENDMENT NO 1. TO
CREDIT AGREEMENT DATED AS OF AUGUST 8, 2008, OF
QUICKSILVER RESOURCES INC.

Name of Lender:		GLOBAL LOAN OPPORTUNITY FUND B.V.
by		Ares Management Limited, its Portfolio Manager
		/s/ Americo Cascella
		Name: Americo Cascella
		Title: Authorized Signatory
Name of Lender:		ARES IIIR/IVR CLO LTD.
by		Ares CLO Management IIIR/IVR, L.P.
by		Ares CLO GP IIIR/IVR, LLC, its General Partner
by		Ares Management LLC, its Manager
		/s/ Americo Cascella
		Name: Americo Cascella
		Title: Authorized Signatory
Name of Lender:		ARES VIR CLO LTD.
by		Ares CLO Management VIR, L.P., Investment Manager
by		Ares CLO GP VIR, LLC, its General Manager
		/s/ Americo Cascella
		Name: Americo Cascella
		Title: Authorized Signatory

SIGNATURE PAGE TO AMENDMENT NO 1. TO
CREDIT AGREEMENT DATED AS OF AUGUST 8, 2008, OF
QUICKSILVER RESOURCES INC.

Name of Lender:		ARES IX CLO LTD.
by		Ares CLO Management IX, L.P., Investment Manager
by		Ares CLO GP IX, LLC, its General Partner
by		Ares Management LLC, its Managing Member
		/s/ Americo Cascella
		Name: Americo Cascella
		Title: Authorized Signatory
Name of Lender:		SEI INSTITUTIONAL INVESTMENT TRUST — HIGH YIELD BOND FUND
by		Ares Management LLC, as Sub-Adviser
		/s/ Americo Cascella
		Name: Americo Cascella
		Title: Authorized Signatory

SIGNATURE PAGE TO AMENDMENT NO 1. TO
CREDIT AGREEMENT DATED AS OF AUGUST 8, 2008, OF
QUICKSILVER RESOURCES INC.

Name of Lender:		COLUMBUSNOVA CLO LTD. 2006-II
by		/s/ John Bengough
		Name: John Bengough
		Title: Director

SIGNATURE PAGE TO AMENDMENT NO 1. TO
CREDIT AGREEMENT DATED AS OF AUGUST 8, 2008, OF
QUICKSILVER RESOURCES INC.

Name of Lender:		COLUMBUSNOVA CLO LTD. 2007-I
by		/s/ John Bengough
		Name: John Bengough
		Title: Director

SIGNATURE PAGE TO AMENDMENT NO 1. TO
CREDIT AGREEMENT DATED AS OF AUGUST 8, 2008, OF
QUICKSILVER RESOURCES INC.

Name of Lender:		COLUMBUSNOVA CLO IV LTD. 2007-II
by		/s/ John Bengough
		Name: John Bengough
		Title: Director

SIGNATURE PAGE TO AMENDMENT NO 1. TO
CREDIT AGREEMENT DATED AS OF AUGUST 8, 2008, OF
QUICKSILVER RESOURCES INC.

Name of Lender:		EAGLE CREEK CLO LTD.
by		/s/ Bryan Higgins
		Name: Bryan Higgins
		Title: Authorized Signatory

SIGNATURE PAGE TO AMENDMENT NO 1. TO
CREDIT AGREEMENT DATED AS OF AUGUST 8, 2008, OF
QUICKSILVER RESOURCES INC.

Name of Lender:		FALL CREEK CLO, LTD.
by		/s/ Bryan Higgins
		Name: Bryan Higgins
		Title: Authorized Signatory

SIGNATURE PAGE TO AMENDMENT NO 1. TO
CREDIT AGREEMENT DATED AS OF AUGUST 8, 2008, OF
QUICKSILVER RESOURCES INC.

Name of Lender:		CLYDESDALE CLO 2003 LTD.
by		Nomura Corporate Research and Asset Management Inc., as Collateral Manager
		/s/ Robert Hoffman
		Name: Robert Hoffman
		Title: Director

SIGNATURE PAGE TO AMENDMENT NO 1. TO
CREDIT AGREEMENT DATED AS OF AUGUST 8, 2008, OF
QUICKSILVER RESOURCES INC.

Name of Lender:		CLYDESDALE CLO 2004, LTD.
by		Nomura Corporate Research and Asset Management Inc., as Investment Manager
		/s/ Robert Hoffman
		Name: Robert Hoffman
		Title: Director

SIGNATURE PAGE TO AMENDMENT NO 1. TO
CREDIT AGREEMENT DATED AS OF AUGUST 8, 2008, OF
QUICKSILVER RESOURCES INC.

Name of Lender:		CLYDESDALE STRATEGIC CLO I, LTD.
by		Nomura Corporate Research and Asset Management Inc., as Investment Manager
		/s/ Robert Hoffman
		Name: Robert Hoffman
		Title: Director

SIGNATURE PAGE TO AMENDMENT NO 1. TO
CREDIT AGREEMENT DATED AS OF AUGUST 8, 2008, OF
QUICKSILVER RESOURCES INC.

Name of Lender:		CLYDESDALE 2005, LTD.
by		Nomura Corporate Research and Asset Management Inc., as Investment Manager
		/s/ Robert Hoffman
		Name: Robert Hoffman
		Title: Director

SIGNATURE PAGE TO AMENDMENT NO 1. TO
CREDIT AGREEMENT DATED AS OF AUGUST 8, 2008, OF
QUICKSILVER RESOURCES INC.

Name of Lender:		CLYDESDALE CLO 2006, LTD.
by		Nomura Corporate Research and Asset Management Inc., as Investment Manager
by		/s/ Robert Hoffman
		Name: Robert Hoffman
		Title: Director

SIGNATURE PAGE TO AMENDMENT NO 1. TO
CREDIT AGREEMENT DATED AS OF AUGUST 8, 2008, OF
QUICKSILVER RESOURCES INC.

Name of Lender:		CLYDESDALE CLO 2007, LTD.
by		Nomura Corporate Research and Asset Management Inc., as Investment Manager
		/s/ Robert Hoffman
		Name: Robert Hoffman
		Title: Director

SIGNATURE PAGE TO AMENDMENT NO 1. TO
CREDIT AGREEMENT DATED AS OF AUGUST 8, 2008, OF
QUICKSILVER RESOURCES INC.

Name of Lender:		NCRAM LOAN TRUST
by		Nomura Corporate Research and Asset Management Inc., as Investment Adviser
		/s/ Robert Hoffman
		Name: Robert Hoffman
		Title: Director

SIGNATURE PAGE TO AMENDMENT NO 1. TO
CREDIT AGREEMENT DATED AS OF AUGUST 8, 2008, OF
QUICKSILVER RESOURCES INC.

Name of Lender:		NCRAM SENIOR LOAN TRUST - 2005
by		Nomura Corporate Research and Asset Management Inc., as Investment Adviser
		/s/ Robert Hoffman
		Name: Robert Hoffman
		Title: Director

SIGNATURE PAGE TO AMENDMENT NO 1. TO
CREDIT AGREEMENT DATED AS OF AUGUST 8, 2008, OF
QUICKSILVER RESOURCES INC.

Name of Lender:		PIMCO HIGH YIELD FUND
by		Pacific Investment Management Company LLC, as its Investment Advisor for the PIMCO High Yield Fund, acting through Investors Fiduciary Trust Company in the Nominee Name of IFTCO
by		/s/ Arthur Y.D. Ong
		Name: Arthur Y.D. Ong
		Title: Executive Vice President