Document:

<Page>

                                                           EXHIBIT 4.8 and 10.26

                       FIRST AMENDMENT TO CREDIT AGREEMENT

      THIS FIRST AMENDMENT TO CREDIT AGREEMENT (hereinafter referred to as the
"First Amendment") executed as of the 14th of November, 2001, by and among EXCO
RESOURCES, INC., a Texas corporation and EXCO OPERATING, LP, a Delaware limited
partnership (collectively hereinafter referred to as "Borrower") and BANK ONE,
NA, a national banking association ("Bank One"), and each of the financial
institutions which is a party hereto (as evidenced by the signature pages to the
Agreement) or which may from time to time become a party thereto pursuant to the
provisions of Section 28 thereof or any successor or assignee thereof
(hereinafter collectively referred to as "Lenders", and individually, "Lender")
and Bank One, as Administrative Agent (the "Agent") and Fleet National Bank, as
Syndication Agent, BNP Paribas, as Documentation Agent and Banc One Capital
Markets, Inc., as Lead Arranger and Bookrunner ("Arranger").

                                   WITNESSETH:

      WHEREAS, as of April 26, 2001, EXCO Resources, Inc., the Lenders and the
Agent entered into a Credit Agreement pursuant to which the Lenders made
available to the Borrower a credit facility (the "Credit Agreement"); and

      WHEREAS, as of September 13, 2001, EXCO Resources, Inc., the Lenders and
the Agent entered into a letter amendment amending the Credit Agreement; and

      WHEREAS, EXCO Resources, Inc. has requested that Majority Lenders agree to
make certain amendments to the Credit Agreement including, but not limited to,
the addition of a new borrower, EXCO Operating, LP ("Operating"), and Majority
Lenders have agreed to do so on the terms and conditions hereinafter set forth.

      NOW, THEREFORE, the parties agree to amend the Credit Agreement as
follows:

      1. Unless otherwise defined herein all defined terms used herein shall
have the same meaning as ascribed to such terms in the Credit Agreement.

      2. Section 1 of the Credit Agreement is hereby amended in the following
respects:

            (a) The definition of "Consolidated Current Assets" is hereby
      deleted and the following inserted in lieu thereof:

                  "Consolidated Current Assets means the total of the
            consolidated current assets determined in accordance with GAAP,
            plus, as of any date, the unused availability on the Revolving
            Commitment, less any amount required to be included in Consolidated
            Current Assets as a result of the application of FASB Statement
            133."

            (b) The definition of "Consolidated Current Liabilities" is hereby
      deleted and the following inserted in lieu thereof:
<PAGE>

                  "Consolidated Current Liabilities means the total of
            consolidated current obligations as determined in accordance with
            GAAP, excluding therefrom any amount required to be included in
            Consolidated Current Liabilities as a result of the application of
            FASB Statement 133."

            (c) The definition of "Consolidated Net Income" is hereby deleted
      and the following inserted in lieu thereof:

                  "Consolidated Net Income shall mean Borrower's consolidated
            net income after income taxes calculated in accordance with GAAP,
            but excluding (i) any non-cash gains or losses as a result of the
            application of FASB Statement 133, and (ii) the effect of ceiling
            test write downs."

      3. Additional Borrower. The Lenders hereby agree to allow Operating to
become a Borrower hereunder and Operating hereby agrees to be bound by the
provisions of the Credit Agreement, as amended by this First Amendment, and all
of the provisions of the other Loan Documents and hereby assumes, jointly and
severally, with the other Borrower, any and all obligations owed to the Lenders
under the terms of the Credit Agreement, the Notes issued thereunder and the
other Loan Documents. The obligations of Operating under the Credit Agreement,
the Notes and the other Loan Documents shall be joint and several with the
obligations of EXCO Resources, Inc. but the liability of Operating thereunder
shall be limited to the maximum amount of liability that can be incurred without
rendering the obligations of Operating under the Loan Documents voidable under
applicable law relating to fraudulent conveyance or fraudulent transfer, and not
for any greater amount.

      4. Section 13 of the Credit Agreement is hereby amended in the following
respects:

            (a) Subsection 13(d) of the Credit Agreement is deleted in its
      entirety and the following inserted in lieu thereof:

                  "(d) Minimum Consolidated Tangible Net Worth. The Borrower
            will not allow its Consolidated Tangible Net Worth to ever be less
            than the sum of (i) $48,000,000, plus (ii) as of the end of each
            fiscal quarter beginning with the fiscal quarter ending June 30,
            2001, 50% of Borrower's Consolidated Net Income for such fiscal
            quarter then ended (but only if positive) and (iii) 75% of the net
            proceeds received by Borrower from the issuance of any equity
            securities after the Effective Date, excluding, in each instance,
            the effect of ceiling test write downs."

            (b) Subsection 13(e) of the Credit Agreement is deleted in its
      entirety and the following inserted in lieu thereof:

                  "(e) Leverage Ratio. Borrower will not allow its ratio of
            Consolidated Debt to Consolidated Total Capital to ever be greater
            than 0.7 to 1.0 tested at the end of each fiscal quarter beginning
            with the fiscal quarter ending June 30, 2001, excluding the effect
            of ceiling test write

                                       -2-
<PAGE>

            downs."

            (c) Subsection 13(n) of the Credit Agreement is hereby amended by
      deleting Subsections (iv) and (v) therefrom in their entirety and
      substituting the following three new Subsections in lieu thereof:

           "(iv)  investments in Addison not exceeding the amount of all
                  dividends received from Addison;

            (v)   investments in Subsidiaries (excluding Addison) but only to
                  the extent of such investments as of the Effective Date; or

            (vi)  other investments not exceeding in the aggregate at the time
                  of the incurrence thereof the amount of (A) $5,000,000
                  (measured in costs on a cumulative basis) whenever the
                  Borrowing Base Usage is equal to or greater than 75%, and (B)
                  $10,000,000 (measured in costs on a cumulative basis) whenever
                  the Borrowing Base Usage is less than 75%.

      5. The Borrower has requested a waiver of the following:

            (a) The Events of Default under the terms of Sections 13(i) and (l)
      of the Credit Agreement which occurred as a result of loans made by
      Borrower to Addison to repay its indebtedness owed to Bank One Canada, et
      al. and

            (b) Any Event of Default that may occur under Section 12(q) or 13(a)
      of the Credit Agreement as a result of the assignment by EXCO Resources,
      Inc. of Oil and Gas Properties located in the State of Texas to Operating.

      6. Majority Lenders hereby agree to waive any Event of Default that may
have occurred under Sections 13(i) or (l) of the Credit Agreement as a result of
Borrower loaning monies to Addison to allow Addison to repay its obligations
owed to Bank One Canada, et al. and any Event of Default that may occur under
Section 12(q) and 13(a) of the Credit Agreement as a result of the assignment of
certain Oil and Gas Properties by EXCO Resources, Inc. to Operating. The waiver
of any Event of Default which occurred as a result of the transfer of assets
from EXCO Resources, Inc. to Operating is made subject to the requirement that
all such Oil and Gas Properties be assigned subject to all indebtedness owed
under the Loan Documents and that Operating assume any and all obligations owed
Lenders under the Loan Documents. The waivers contained in this paragraph 4 are
waivers of specific sections referred to herein and are not waivers of any other
Defaults or Events of Default that may have occurred under the provisions of the
Credit Agreement.

      7. Except to the extent its provisions are specifically amended, modified
or superseded by this First Amendment, the representations, warranties and
affirmative and negative covenants of the Borrower contained in the Credit
Agreement are incorporated herein by reference for all purposes as if copied
herein in full. The Borrower hereby restates and

                                      -3-
<PAGE>

reaffirms each and every term and provision of the Credit Agreement, as amended,
including, without limitation, all representations, warranties and affirmative
and negative covenants (except to the extent that such representations and
warranties related solely to an earlier date). Except to the extent its
provisions are specifically amended, modified or superseded by this First
Amendment, the Credit Agreement, as amended, and all terms and provisions
thereof shall remain in full force and effect, and the same in all respects are
confirmed and approved by the Borrower and the Lenders.

      8. This First Amendment shall be effective as of the date first above
written, but only upon the satisfaction of the conditions precedent set forth in
Paragraph 9 hereof (the "First Amendment Effective Date").

      9. The obligations of Lenders under this First Amendment shall be subject
to the following conditions precedent:

            (a) Execution and Delivery. Each Borrower shall have executed and
      delivered this First Amendment, the Amended Notes in the form of Exhibits
      A-1 through A-4 hereto, and other required documents, all in form and
      substance satisfactory to the Agent;

            (b) Assignments. EXCO Resources, Inc. shall have executed and
      delivered to Operating assignments of its interest in certain of its Oil
      and Gas Properties located within the State of Texas, said form of
      assignment to be in form and substance satisfactory to the Agent;

            (c) Resolutions. The Agent shall have received certified Resolutions
      of each Borrower;

            (d) Good Standing and Existence. The Agent shall have received
      evidence of existence and good standing for each Borrower;

            (b) Representations and Warranties. The representations and
      warranties of the Borrowers under this First Amendment are true and
      correct in all material respects as of such date, as if then made (except
      to the extent that such representations and warranties related solely to
      an earlier date);

            (c) No Event of Default. No Event of Default shall have occurred and
      be continuing nor shall any event have occurred or failed to occur which,
      with the passage of time or service of notice, or both, would constitute
      an Event of Default.

            (d) Other Documents. The Agent shall have received such other
      instruments and documents incidental and appropriate to the transaction
      provided for herein as the Agent or its counsel may reasonably request,
      and all such documents shall be in form and substance satisfactory to the
      Agent;

                                      -4-
<PAGE>

            (e) Legal Matters. All legal matters incident to the consummation of
      the transactions contemplated hereby shall be reasonably satisfactory to
      special counsel for the Agent retained at the expense of Borrower.

      10. Borrower hereby represents and warrants that all factual information
heretofore and contemporaneously furnished by or on behalf of Borrower to Agent
for purposes of or in connection with this First Amendment does not contain any
untrue statement of a material fact or omit to state any material fact necessary
to keep the statements contained herein or therein from being materially
misleading. Each of the foregoing representations and warranties shall
constitute a representation and warranty of Borrower made under the Credit
Agreement, and it shall be an Event of Default if any such representation and
warranty shall prove to have been incorrect or false in any material respect at
the time given. Each of the representations and warranties made under the Credit
Agreement (including those made herein) shall survive and not be waived by the
execution and delivery of this First Amendment or any investigation by Lenders.

      11. The Borrower agrees to indemnify and hold harmless the Lenders and
their respective officers, employees, agents, attorneys and representatives
(singularly, an "Indemnified Party", and collectively, the "Indemnified
Parties") from and against any loss, cost, liability, damage or expense
(including the reasonable fees and out-of-pocket expenses of counsel to the
Lender, including all local counsel hired by such counsel) ("Claim") incurred by
the Lenders in investigating or preparing for, defending against, or providing
evidence, producing documents or taking any other action in respect of any
commenced or threatened litigation, administrative proceeding or investigation
under any federal securities law, federal or state environmental law, or any
other statute of any jurisdiction, or any regulation, or at common law or
otherwise, which is alleged to arise out of or is based upon any acts, practices
or omissions or alleged acts, practices or omissions of the Borrower or its
agents or arises in connection with the duties, obligations or performance of
the Indemnified Parties in negotiating, preparing, executing, accepting,
keeping, completing, countersigning, issuing, selling, delivering, releasing,
assigning, handling, certifying, processing or receiving or taking any other
action with respect to the Loan Documents and all documents, items and materials
contemplated thereby even if any of the foregoing arises out of an Indemnified
Party's ordinary negligence. The indemnity set forth herein shall be in addition
to any other obligations or liabilities of the Borrower to the Lenders hereunder
or at common law or otherwise, and shall survive any termination of this First
Amendment, the expiration of the Loan and the payment of all indebtedness of the
Borrower to the Lenders hereunder and under the Notes, provided that the
Borrower shall have no obligation under this section to the Lenders with respect
to any of the foregoing arising out of the gross negligence or willful
misconduct of the Lenders. If any Claim is asserted against any Indemnified
Party, the Indemnified Party shall endeavor to notify the Borrower of such Claim
(but failure to do so shall not affect the indemnification herein made except to
the extent of the actual harm caused by such failure). The Indemnified Party
shall have the right to employ, at the Borrower's expense, counsel of the
Indemnified Parties' choosing and to control the defense of the Claim. The
Borrower may at its own expense also participate in the defense of any Claim.
Each Indemnified Party may employ separate counsel in connection with any Claim
to the extent such Indemnified Party believes it reasonably prudent to protect
such Indemnified Party. The

                                      -5-
<PAGE>

parties intend for the provisions of this Section to apply to and protect each
Indemnified Party from the consequences of strict liability imposed or
threatened to be imposed on any Indemnified Party as well as from the
consequences of its own negligence, whether or not that negligence is the sole,
contributing, or concurring cause of any Claim.

      12. This First Amendment may be executed in any number of counterparts and
all of such counterparts taken together shall be deemed to constitute one and
the same instrument.

      13. WRITTEN CREDIT AGREEMENT. THE CREDIT AGREEMENT, AS AMENDED BY THIS
FIRST AMENDMENT REPRESENTS THE FINAL AGREEMENT BETWEEN AND AMONG 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 BETWEEN AND
AMONG THE PARTIES.

      IN WITNESS WHEREOF, the parties have caused this First Amendment to Credit
Agreement to be duly executed as of the date first above written.

                               BORROWER:

                               EXCO RESOURCES, INC.

                               By: /s/ J. DOUGLAS RAMSEY
                                   --------------------------------------------
                                   J. Douglas Ramsey, Vice President

                               EXCO OPERATING, LP

                               By: EXCO Investment II, LLC, its General Partner

                               By: /s/ T. W. EUBANK
                                   --------------------------------------------
                                   T. W. Eubank, President

                                      -6-
<PAGE>

                                   LENDERS:

                                   BANK ONE, NA, a national banking
                                   association, as a Lender and as
                                   Administrative Agent
                                   (Main Office Chicago)

                                   By: /s/ WM. MARK CRANMER
                                      ------------------------------------------
                                      Wm. Mark Cranmer, Director Capital Markets

                                   FLEET NATIONAL BANK
                                   as a Lender and as Syndication Agent

                                   By: /s/ JEFFREY RATHKAMP
                                      ------------------------------------------
                                   Name: Jeffrey Rathkamp
                                        ----------------------------------------
                                   Title: Vice President
                                         ---------------------------------------

                                   BNP PARIBAS
                                   as a Lender and as Documentation Agent

                                   By: /s/ A. DAVID DODD
                                      ------------------------------------------
                                   Name: A. David Dodd
                                        ----------------------------------------
                                   Title: Vice President
                                         ---------------------------------------

                                   By: /s/ BRIAN M. MALONE
                                      ------------------------------------------
                                   Name: Brian M. Malone
                                        ----------------------------------------
                                   Title: Managing Director
                                         ---------------------------------------

                                   COMERICA BANK-TEXAS

                                   By: /s/ PETER L. SEFZIK
                                      ------------------------------------------
                                   Name: Peter L. Sefzik
                                        ----------------------------------------
                                   Title: Corporate Banking Officer
                                         ---------------------------------------

                                      -7-
<PAGE>

                                   EXHIBIT A-1

                             AMENDED REVOLVING NOTE

$25,924,653.56                    Dallas, Texas              November 14, 2001

      FOR VALUE RECEIVED, the undersigned EXCO RESOURCES, INC. and EXCO
OPERATING, LP (herein collectively, the "Borrower") hereby unconditionally
promises to pay to the order of BANK ONE, NA (the "Lender") at the offices of
BANK ONE, NA (the "Agent") in Dallas County, Texas, the principal sum of
TWENTY-FIVE MILLION NINE HUNDRED TWENTY-FOUR THOUSAND SIX HUNDRED FIFTY-THREE
AND 56/100 DOLLARS ($25,924,653.56), or so much thereof as may be advanced and
outstanding at any time or from time to time pursuant to the Credit Agreement
(as hereinafter defined) in lawful money of the United States of America
together with interest from the date hereof until paid at the rates specified in
the Credit Agreement (as hereinafter defined). All payments of principal and
interest due hereunder are payable at the offices of Agent at 1717 Main Street,
4th Floor, Bank One Center, Dallas, Texas 75201, attention: Energy Department,
or at such other address as Lender shall designate in writing to Borrower.

      The principal and all accrued interest on this Note shall be due and
payable in accordance with the terms and provisions of the Credit Agreement.

      This Note is executed pursuant to that certain First Amendment to Credit
Agreement dated of even date herewith between Borrower, the Agents and Lenders
(the "First Amendment"), and is one of the Notes referred to therein. The First
Amendment amended that certain Credit Agreement dated as of April 26, 2001
between Borrower, the Agents and the Lenders (the Credit Agreement as amended by
the First Amendment is hereinafter referred to as the "Credit Agreement").
Reference is made to the Credit Agreement for a statement of prepayment rights
and obligations of Borrower, for a statement of the terms and conditions under
which the due date of this Note may be accelerated and for statements regarding
other matters affecting this Note (including without limitation the obligations
of the holder hereof to advance funds hereunder, principal and interest payment
due dates, voluntary and mandatory prepayments, exercise of rights and remedies,
payment of attorneys' fees, court costs and other costs of collection and
certain waivers by Borrower and others now or hereafter obligated for payment of
any sums due hereunder). Upon the occurrence of an Event of Default, as that
term is defined in the Credit Agreement and Loan Documents, the Agent may
declare forthwith to be entirely and immediately due and payable the principal
balance hereof and the interest accrued hereon, and the Lender shall have all
rights and remedies of the Lender under the Credit Agreement and Loan Documents.
This Note may be prepaid in accordance with the terms and provisions of the
Credit Agreement.

      Regardless of any provision contained in this Note, the holder hereof
shall never be entitled to receive, collect or apply, as interest on this Note,
any amount in excess of the Maximum Rate (as such term is defined in the Credit
Agreement), and, if the holder hereof ever receives, collects, or applies as
interest, any such amount which would be excessive interest, it shall be deemed
a partial prepayment of principal and treated hereunder as such; and, if the
indebtedness evidenced hereby is paid in full, any remaining excess shall
forthwith be paid to
<PAGE>

Borrower. In determining whether or not the interest paid or payable, under any
specific contingency, exceeds the Maximum Rate, Borrower and the holder hereof
shall, to the maximum extent permitted under applicable law (i) characterize any
non-principal payment as an expense, fee or premium rather than as interest,
(ii) exclude voluntary prepayments and the effects thereof, and (iii) spread the
total amount of interest throughout the entire contemplated term of the
obligations evidenced by this Note and/or referred to in the Credit Agreement so
that the interest rate is uniform throughout the entire term of this Note;
provided that, if this Note is paid and performed in full prior to the end of
the full contemplated term thereof; and if the interest received for the actual
period of existence thereof exceeds the Maximum Rate, the holder hereof shall
refund to Borrower the amount of such excess or credit the amount of such excess
against the indebtedness evidenced hereby, and, in such event, the holder hereof
shall not be subject to any penalties provided by any laws for contracting for,
charging, taking, reserving or receiving interest in excess of the Maximum Rate.

      If any payment of principal or interest on this Note shall become due on a
day other than a Business Day (as such term is defined in the Credit Agreement),
such payment shall be made on the next succeeding Business Day and such
extension of time shall in such case be included in computing interest in
connection with such payment.

      If this Note is placed in the hands of an attorney for collection, or if
it is collected through any legal proceeding at law or in equity or in
bankruptcy, receivership or other court proceedings, Borrower agrees to pay all
costs of collection, including, but not limited to, court costs and reasonable
attorneys' fees.

      Borrower and each surety, endorser, guarantor and other party ever liable
for payment of any sums of money payable on this Note, jointly and severally
waive presentment and demand for payment, notice of intention to accelerate the
maturity, protest, notice of protest and nonpayment, as to this Note and as to
each and all installments hereof, and agree that their liability under this Note
shall not be affected by any renewal or extension in the time of payment hereof,
or in any indulgences, or by any release or change in any security for the
payment of this Note, and hereby consent to any and all renewals, extensions,
indulgences, releases or changes.

      This Note shall be governed by and construed in accordance with the
applicable laws of the United States of America and the laws of the State of
Texas.

      This Note is given in amendment (but not in extinguishment) of that
certain Note dated April 26, 2001 executed by EXCO Resources, Inc. and payable
to the order of the aforesaid Lender.

      THIS WRITTEN NOTE, THE CREDIT AGREEMENT AND THE OTHER LOAN DOCUMENTS
REPRESENT THE FINAL AGREEMENTS 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 BETWEEN THE PARTIES.

                                      -2-
<PAGE>

      EXECUTED as of the date and year first above written.

                                       BORROWER:
                                       --------

                                       EXCO RESOURCES, INC.
                                       a Texas corporation

                                       By: /s/ J. DOUGLAS RAMSEY
                                           ---------------------------------
                                           J. Douglas Ramsey, Vice President

                                       EXCO OPERATING, LP
                                       a Delaware limited partnership

                                       By: EXCO Investment II, LLC,
                                           its General Partner

                                       By: /s/ T. W. EUBANK
                                           ---------------------------------
                                           T. W. Eubank, President

                                       -3-
<PAGE>

                                   EXHIBIT A-2

                             AMENDED REVOLVING NOTE

$46,632,478.63                    Dallas, Texas               November 14, 2001

      FOR VALUE RECEIVED, the undersigned EXCO RESOURCES, INC. and EXCO
OPERATING, LP (herein collectively, the "Borrower") hereby unconditionally
promises to pay to the order of FLEET NATIONAL BANK (the "Lender") at the
offices of BANK ONE, NA (the "Agent") in Dallas County, Texas, the principal sum
of FORTY-SIX MILLION SIX HUNDRED THIRTY-TWO THOUSAND FOUR HUNDRED SEVENTY-EIGHT
AND 63/100 DOLLARS ($46,632,478.63), or so much thereof as may be advanced and
outstanding at any time or from time to time pursuant to the Credit Agreement
(as hereinafter defined) in lawful money of the United States of America
together with interest from the date hereof until paid at the rates specified in
the Credit Agreement (as hereinafter defined). All payments of principal and
interest due hereunder are payable at the offices of Agent at 1717 Main Street,
4th Floor, Bank One Center, Dallas, Texas 75201, attention: Energy Department,
or at such other address as Lender shall designate in writing to Borrower.

      The principal and all accrued interest on this Note shall be due and
payable in accordance with the terms and provisions of the Credit Agreement.

      This Note is executed pursuant to that certain First Amendment to Credit
Agreement dated of even date herewith between Borrower, the Agents and Lenders
(the "First Amendment"), and is one of the Notes referred to therein. The First
Amendment amended that certain Credit Agreement dated as of April 26, 2001
between Borrower, the Agents and the Lenders (the Credit Agreement as amended by
the First Amendment is hereinafter referred to as the "Credit Agreement").
Reference is made to the Credit Agreement for a statement of prepayment rights
and obligations of Borrower, for a statement of the terms and conditions under
which the due date of this Note may be accelerated and for statements regarding
other matters affecting this Note (including without limitation the obligations
of the holder hereof to advance funds hereunder, principal and interest payment
due dates, voluntary and mandatory prepayments, exercise of rights and remedies,
payment of attorneys' fees, court costs and other costs of collection and
certain waivers by Borrower and others now or hereafter obligated for payment of
any sums due hereunder). Upon the occurrence of an Event of Default, as that
term is defined in the Credit Agreement and Loan Documents, the Agent may
declare forthwith to be entirely and immediately due and payable the principal
balance hereof and the interest accrued hereon, and the Lender shall have all
rights and remedies of the Lender under the Credit Agreement and Loan Documents.
This Note may be prepaid in accordance with the terms and provisions of the
Credit Agreement.

      Regardless of any provision contained in this Note, the holder hereof
shall never be entitled to receive, collect or apply, as interest on this Note,
any amount in excess of the Maximum Rate (as such term is defined in the Credit
Agreement), and, if the holder hereof ever receives, collects, or applies as
interest, any such amount which would be excessive interest, it shall be deemed
a partial prepayment of principal and treated hereunder as such; and, if the
indebtedness evidenced hereby is paid in full, any remaining excess shall
forthwith be paid to
<PAGE>

Borrower. In determining whether or not the interest paid or payable, under any
specific contingency, exceeds the Maximum Rate, Borrower and the holder hereof
shall, to the maximum extent permitted under applicable law (i) characterize any
non-principal payment as an expense, fee or premium rather than as interest,
(ii) exclude voluntary prepayments and the effects thereof, and (iii) spread the
total amount of interest throughout the entire contemplated term of the
obligations evidenced by this Note and/or referred to in the Credit Agreement so
that the interest rate is uniform throughout the entire term of this Note;
provided that, if this Note is paid and performed in full prior to the end of
the full contemplated term thereof; and if the interest received for the actual
period of existence thereof exceeds the Maximum Rate, the holder hereof shall
refund to Borrower the amount of such excess or credit the amount of such excess
against the indebtedness evidenced hereby, and, in such event, the holder hereof
shall not be subject to any penalties provided by any laws for contracting for,
charging, taking, reserving or receiving interest in excess of the Maximum Rate.

      If any payment of principal or interest on this Note shall become due on a
day other than a Business Day (as such term is defined in the Credit Agreement),
such payment shall be made on the next succeeding Business Day and such
extension of time shall in such case be included in computing interest in
connection with such payment.

      If this Note is placed in the hands of an attorney for collection, or if
it is collected through any legal proceeding at law or in equity or in
bankruptcy, receivership or other court proceedings, Borrower agrees to pay all
costs of collection, including, but not limited to, court costs and reasonable
attorneys' fees.

      Borrower and each surety, endorser, guarantor and other party ever liable
for payment of any sums of money payable on this Note, jointly and severally
waive presentment and demand for payment, notice of intention to accelerate the
maturity, protest, notice of protest and nonpayment, as to this Note and as to
each and all installments hereof, and agree that their liability under this Note
shall not be affected by any renewal or extension in the time of payment hereof,
or in any indulgences, or by any release or change in any security for the
payment of this Note, and hereby consent to any and all renewals, extensions,
indulgences, releases or changes.

      This Note shall be governed by and construed in accordance with the
applicable laws of the United States of America and the laws of the State of
Texas.

      This Note is given in amendment (but not in extinguishment) of that
certain Note dated April 26, 2001 executed by EXCO Resources, Inc. and payable
to the order of the aforesaid Lender.

      THIS WRITTEN NOTE, THE CREDIT AGREEMENT AND THE OTHER LOAN DOCUMENTS
REPRESENT THE FINAL AGREEMENTS 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 BETWEEN THE PARTIES.

                                      -2-
<PAGE>

      EXECUTED as of the date and year first above written.

                                       BORROWER:
                                       --------

                                       EXCO RESOURCES, INC.
                                       a Texas corporation

                                       By: /s/ J. DOUGLAS RAMSEY
                                           ---------------------------------
                                           J. Douglas Ramsey, Vice President

                                       EXCO OPERATING, LP
                                       a Delaware limited partnership

                                       By: EXCO Investment II, LLC,
                                           its General Partner

                                       By: /s/ T. W. EUBANK
                                           ---------------------------------
                                           T. W. Eubank, President

                                      -3-
<PAGE>

                                   EXHIBIT A-3

                             AMENDED REVOLVING NOTE

$33,384,615.38                    Dallas, Texas               November 14, 2001

      FOR VALUE RECEIVED, the undersigned EXCO RESOURCES, INC. and EXCO
OPERATING, LP (herein collectively, the "Borrower") hereby unconditionally
promises to pay to the order of BNP PARIBAS (the "Lender") at the offices of
BANK ONE, NA (the "Agent") in Dallas County, Texas, the principal sum of
THIRTY-THREE MILLION THREE HUNDRED EIGHTY-FOUR THOUSAND SIX HUNDRED FIFTEEN AND
38/100 DOLLARS ($33,384,615.38), or so much thereof as may be advanced and
outstanding at any time or from time to time pursuant to the Credit Agreement
(as hereinafter defined) in lawful money of the United States of America
together with interest from the date hereof until paid at the rates specified in
the Credit Agreement (as hereinafter defined). All payments of principal and
interest due hereunder are payable at the offices of Agent at 1717 Main Street,
4th Floor, Bank One Center, Dallas, Texas 75201, attention: Energy Department,
or at such other address as Lender shall designate in writing to Borrower.

      The principal and all accrued interest on this Note shall be due and
payable in accordance with the terms and provisions of the Credit Agreement.

      This Note is executed pursuant to that certain First Amendment to Credit
Agreement dated of even date herewith between Borrower, the Agents and Lenders
(the "First Amendment"), and is one of the Notes referred to therein. The First
Amendment amended that certain Credit Agreement dated as of April 26, 2001
between Borrower, the Agents and the Lenders (the Credit Agreement as amended by
the First Amendment is hereinafter referred to as the "Credit Agreement").
Reference is made to the Credit Agreement for a statement of prepayment rights
and obligations of Borrower, for a statement of the terms and conditions under
which the due date of this Note may be accelerated and for statements regarding
other matters affecting this Note (including without limitation the obligations
of the holder hereof to advance funds hereunder, principal and interest payment
due dates, voluntary and mandatory prepayments, exercise of rights and remedies,
payment of attorneys' fees, court costs and other costs of collection and
certain waivers by Borrower and others now or hereafter obligated for payment of
any sums due hereunder). Upon the occurrence of an Event of Default, as that
term is defined in the Credit Agreement and Loan Documents, the Agent may
declare forthwith to be entirely and immediately due and payable the principal
balance hereof and the interest accrued hereon, and the Lender shall have all
rights and remedies of the Lender under the Credit Agreement and Loan Documents.
This Note may be prepaid in accordance with the terms and provisions of the
Credit Agreement.

      Regardless of any provision contained in this Note, the holder hereof
shall never be entitled to receive, collect or apply, as interest on this Note,
any amount in excess of the Maximum Rate (as such term is defined in the Credit
Agreement), and, if the holder hereof ever receives, collects, or applies as
interest, any such amount which would be excessive interest, it shall be deemed
a partial prepayment of principal and treated hereunder as such; and, if the
indebtedness evidenced hereby is paid in full, any remaining excess shall
forthwith be paid to

<PAGE>

Borrower. In determining whether or not the interest paid or payable, under any
specific contingency, exceeds the Maximum Rate, Borrower and the holder hereof
shall, to the maximum extent permitted under applicable law (i) characterize any
non-principal payment as an expense, fee or premium rather than as interest,
(ii) exclude voluntary prepayments and the effects thereof, and (iii) spread the
total amount of interest throughout the entire contemplated term of the
obligations evidenced by this Note and/or referred to in the Credit Agreement so
that the interest rate is uniform throughout the entire term of this Note;
provided that, if this Note is paid and performed in full prior to the end of
the full contemplated term thereof; and if the interest received for the actual
period of existence thereof exceeds the Maximum Rate, the holder hereof shall
refund to Borrower the amount of such excess or credit the amount of such excess
against the indebtedness evidenced hereby, and, in such event, the holder hereof
shall not be subject to any penalties provided by any laws for contracting for,
charging, taking, reserving or receiving interest in excess of the Maximum Rate.

      If any payment of principal or interest on this Note shall become due on a
day other than a Business Day (as such term is defined in the Credit Agreement),
such payment shall be made on the next succeeding Business Day and such
extension of time shall in such case be included in computing interest in
connection with such payment.

      If this Note is placed in the hands of an attorney for collection, or if
it is collected through any legal proceeding at law or in equity or in
bankruptcy, receivership or other court proceedings, Borrower agrees to pay all
costs of collection, including, but not limited to, court costs and reasonable
attorneys' fees.

      Borrower and each surety, endorser, guarantor and other party ever liable
for payment of any sums of money payable on this Note, jointly and severally
waive presentment and demand for payment, notice of intention to accelerate the
maturity, protest, notice of protest and nonpayment, as to this Note and as to
each and all installments hereof, and agree that their liability under this Note
shall not be affected by any renewal or extension in the time of payment hereof,
or in any indulgences, or by any release or change in any security for the
payment of this Note, and hereby consent to any and all renewals, extensions,
indulgences, releases or changes.

      This Note shall be governed by and construed in accordance with the
applicable laws of the United States of America and the laws of the State of
Texas.

      This Note is given in amendment (but not in extinguishment) of that
certain Note dated April 26, 2001 executed by EXCO Resources, Inc. and payable
to the order of the aforesaid Lender.

      THIS WRITTEN NOTE, THE CREDIT AGREEMENT AND THE OTHER LOAN DOCUMENTS
REPRESENT THE FINAL AGREEMENTS 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 BETWEEN THE PARTIES.

                                      -2-
<PAGE>

      EXECUTED as of the date and year first above written.

                                       BORROWER:
                                       --------

                                       EXCO RESOURCES, INC.
                                       a Texas corporation

                                       By: /s/ J. DOUGLAS RAMSEY
                                           ---------------------------------
                                           J. Douglas Ramsey, Vice President

                                       EXCO OPERATING, LP
                                       a Delaware limited partnership

                                       By: EXCO Investment II, LLC,
                                           its General Partner

                                       By: /s/ T. W. EUBANK
                                           ---------------------------------
                                           T. W. Eubank, President

                                      -3-
<PAGE>

                                   EXHIBIT A-4

                             AMENDED REVOLVING NOTE

$18,058,252.43                    Dallas, Texas               November 14, 2001

      FOR VALUE RECEIVED, the undersigned EXCO RESOURCES, INC. and EXCO
OPERATING, LP (herein collectively, the "Borrower") hereby unconditionally
promises to pay to the order of COMERICA BANK-TEXAS (the "Lender") at the
offices of BANK ONE, NA (the "Agent") in Dallas County, Texas, the principal sum
of EIGHTEEN MILLION FIFTY-EIGHT THOUSAND TWO HUNDRED FIFTY-TWO AND 43/100
DOLLARS ($18,058,252.43), or so much thereof as may be advanced and outstanding
at any time or from time to time pursuant to the Credit Agreement (as
hereinafter defined) in lawful money of the United States of America together
with interest from the date hereof until paid at the rates specified in the
Credit Agreement (as hereinafter defined). All payments of principal and
interest due hereunder are payable at the offices of Agent at 1717 Main Street,
4th Floor, Bank One Center, Dallas, Texas 75201, attention: Energy Department,
or at such other address as Lender shall designate in writing to Borrower.

      The principal and all accrued interest on this Note shall be due and
payable in accordance with the terms and provisions of the Credit Agreement.

      This Note is executed pursuant to that certain First Amendment to Credit
Agreement dated of even date herewith between Borrower, the Agents and Lenders
(the "First Amendment"), and is one of the Notes referred to therein. The First
Amendment amended that certain Credit Agreement dated as of April 26, 2001
between Borrower, the Agents and the Lenders (the Credit Agreement as amended by
the First Amendment is hereinafter referred to as the "Credit Agreement").
Reference is made to the Credit Agreement for a statement of prepayment rights
and obligations of Borrower, for a statement of the terms and conditions under
which the due date of this Note may be accelerated and for statements regarding
other matters affecting this Note (including without limitation the obligations
of the holder hereof to advance funds hereunder, principal and interest payment
due dates, voluntary and mandatory prepayments, exercise of rights and remedies,
payment of attorneys' fees, court costs and other costs of collection and
certain waivers by Borrower and others now or hereafter obligated for payment of
any sums due hereunder). Upon the occurrence of an Event of Default, as that
term is defined in the Credit Agreement and Loan Documents, the Agent may
declare forthwith to be entirely and immediately due and payable the principal
balance hereof and the interest accrued hereon, and the Lender shall have all
rights and remedies of the Lender under the Credit Agreement and Loan Documents.
This Note may be prepaid in accordance with the terms and provisions of the
Credit Agreement.

      Regardless of any provision contained in this Note, the holder hereof
shall never be entitled to receive, collect or apply, as interest on this Note,
any amount in excess of the Maximum Rate (as such term is defined in the Credit
Agreement), and, if the holder hereof ever receives, collects, or applies as
interest, any such amount which would be excessive interest, it shall be deemed
a partial prepayment of principal and treated hereunder as such; and, if the
indebtedness evidenced hereby is paid in full, any remaining excess shall
forthwith be paid to
<PAGE>

Borrower. In determining whether or not the interest paid or payable, under any
specific contingency, exceeds the Maximum Rate, Borrower and the holder hereof
shall, to the maximum extent permitted under applicable law (i) characterize any
non-principal payment as an expense, fee or premium rather than as interest,
(ii) exclude voluntary prepayments and the effects thereof, and (iii) spread the
total amount of interest throughout the entire contemplated term of the
obligations evidenced by this Note and/or referred to in the Credit Agreement so
that the interest rate is uniform throughout the entire term of this Note;
provided that, if this Note is paid and performed in full prior to the end of
the full contemplated term thereof; and if the interest received for the actual
period of existence thereof exceeds the Maximum Rate, the holder hereof shall
refund to Borrower the amount of such excess or credit the amount of such excess
against the indebtedness evidenced hereby, and, in such event, the holder hereof
shall not be subject to any penalties provided by any laws for contracting for,
charging, taking, reserving or receiving interest in excess of the Maximum Rate.

      If any payment of principal or interest on this Note shall become due on a
day other than a Business Day (as such term is defined in the Credit Agreement),
such payment shall be made on the next succeeding Business Day and such
extension of time shall in such case be included in computing interest in
connection with such payment.

      If this Note is placed in the hands of an attorney for collection, or if
it is collected through any legal proceeding at law or in equity or in
bankruptcy, receivership or other court proceedings, Borrower agrees to pay all
costs of collection, including, but not limited to, court costs and reasonable
attorneys' fees.

      Borrower and each surety, endorser, guarantor and other party ever liable
for payment of any sums of money payable on this Note, jointly and severally
waive presentment and demand for payment, notice of intention to accelerate the
maturity, protest, notice of protest and nonpayment, as to this Note and as to
each and all installments hereof, and agree that their liability under this Note
shall not be affected by any renewal or extension in the time of payment hereof,
or in any indulgences, or by any release or change in any security for the
payment of this Note, and hereby consent to any and all renewals, extensions,
indulgences, releases or changes.

      This Note shall be governed by and construed in accordance with the
applicable laws of the United States of America and the laws of the State of
Texas.

      THIS WRITTEN NOTE, THE CREDIT AGREEMENT AND THE OTHER LOAN DOCUMENTS
REPRESENT THE FINAL AGREEMENTS 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 BETWEEN THE PARTIES.

                                      -2-
<PAGE>

      EXECUTED as of the date and year first above written.

                                       BORROWER:
                                       --------

                                       EXCO RESOURCES, INC.
                                       a Texas corporation

                                       By: /s/ J. DOUGLAS RAMSEY
                                           ---------------------------------
                                           J. Douglas Ramsey, Vice President

                                       EXCO OPERATING, LP
                                       a Delaware limited partnership

                                       By: EXCO Investment II, LLC,
                                           its General Partner

                                       By: /s/ T. W. EUBANK
                                           ---------------------------------
                                           T. W. Eubank, President

                                      -3-<Page>

                                                           EXHIBIT 4.9 and 10.27

                      SECOND AMENDMENT TO CREDIT AGREEMENT

      THIS SECOND AMENDMENT TO CREDIT AGREEMENT (hereinafter referred to as the
"Second Amendment") executed as of the 14th of November, 2001, by and between
ADDISON ENERGY INC. ("Borrower") and BANK ONE, NA, CANADA BRANCH (successor by
merger to Bank One Canada) ("Bank One"), and each of the financial institutions
which is a party thereto (as evidenced by the signature pages to the Agreement)
or which may from time to time become a party thereto pursuant to the provisions
of Section 28 of the Credit Agreement or any successor or assignee thereof
(hereinafter collectively referred to as "Lenders", and individually, "Lender")
and Bank One, as Administrative Agent (the "Agent") and BNP Paribas (Canada), as
Documentation Agent and Banc One Capital Markets, Inc., as Lead Arranger and
Bookrunner ("Arranger").

                                   WITNESSETH:

      WHEREAS, as of April 26, 2001, Borrower, the Lenders and the Agent entered
into a Credit Agreement pursuant to which the Lenders made available to the
Borrower a revolving credit facility of up to $77,500,000 Canadian (the "Credit
Agreement"); and

      WHEREAS, as of April 26, 2001, Borrower, the Lenders and the Agent entered
into a First Amendment to Credit Agreement (the "First Amendment"); and

      WHEREAS, the Borrower has requested that Majority Lenders agree to make
certain amendments to the Credit Agreement and Majority Lenders have agreed to
do so on the terms and conditions hereinafter set forth.

      NOW, THEREFORE, the parties agree to amend the Credit Agreement as
follows:

      1. Unless otherwise defined herein all defined terms used herein shall
have the same meaning as ascribed to such terms in the Credit Agreement.

      2. Section 1 of the Credit Agreement is hereby amended in the following
respects:

            (a) The definition of "Consolidated Current Assets" is hereby
      deleted and the following inserted in lieu thereof:

                  "Consolidated Current Assets means the total of the
            consolidated current assets determined in accordance with GAAP,
            plus, as of any date, the unused availability on the Revolving
            Commitment, less any amount required to be included in Consolidated
            Current Assets as a result of the application of FASB Statement
            133."

            (b) The definition of "Consolidated Current Liabilities" is hereby
      deleted and the following inserted in lieu thereof:

                  "Consolidated Current Liabilities means the total of
            consolidated current obligations as determined in accordance with
            GAAP, excluding
<PAGE>

            therefrom any amount required to be included in Consolidated Current
            Liabilities as a result of the application of FASB Statement 133."

            (c) The definition of "Consolidated Debt" is hereby deleted and the
      following inserted in lieu thereof:

                  "Consolidated Debt means, without duplication, all obligations
            and liabilities of a Person on a consolidated basis to any other
            person, including, without limitation, all debts, claims and
            indebtedness, heretofore, now and/or from time to time hereafter
            owing, due or payable, however evidenced, created, incurred,
            acquired or owing and however arising, whether under written or oral
            agreement, operation of law, or otherwise. Debt includes, without
            limiting the foregoing, (i) indebtedness for borrowed money
            (including without duplication obligations to reimburse the issuer
            of any letter of credit or any guarantor or surety), (ii)
            indebtedness for the deferred purchase price of property or
            services, excluding trade accounts payable within ninety (90) days
            and arising in the ordinary course of business, (ii) indebtedness
            evidenced by bonds, debentures, notes or other similar instruments,
            (iv) obligations and liabilities secured by a Lien on property owned
            by such Person whether or not such Person has assumed such
            obligations and liabilities and the amount of which Debt shall not
            exceed the fair market value of the property subject to the Lien if
            such Person has not assumed such obligations and liabilities, (v)
            obligations or liabilities created or arising under any capitalized
            lease, (vi) all net payments or amounts owing by such Person in
            respect of interest rate protection agreements, foreign currency
            exchange agreements, commodity swap agreements or other interests,
            exchange rate or commodity hedging arrangements and (vii)
            liabilities in respect of unfunded vested benefits under any Plan.
            Debt shall not include accounts payable and expense accruals
            incurred or assumed in the ordinary course of business nor shall it
            include liabilities required to be included as balance sheet
            liabilities as a result of the application of FASB Statement 133."

            (d) The definition of "Consolidated Net Income" is hereby deleted
      and the following inserted thereof:

                  "Consolidated Net Income shall mean Borrower's consolidated
            net income after income taxes calculated in accordance with GAAP,
            but excluding (i) any non-cash gains or losses as a result of the
            application of FASB Statement 133, and (ii) the effect of ceiling
            test write downs."

            (e) By addition of the following new definition:

                  "Plan means any plan subject to Title IV of ERISA and
            maintained by Borrower, or any such Plan in which Borrower is
            required to contribute on behalf of its employees."

                                      -2-
<PAGE>

      3. Section 6(b) of the Credit Agreement is hereby amended by deleting the
first two sentences thereof in their entirety and substituting the following one
sentence in lieu thereof:

            "Subsequent determinations of the Borrowing Base shall be made by
      Lenders semi-annually on May 1 and November 1 of each year beginning
      November 1, 2001 or as Unscheduled Redeterminations."

      4. Section 13 of the Credit Agreement is hereby amended in the following
respects:

            (a) Subsection 13(d) of the Credit Agreement is hereby deleted in
      its entirety and the following inserted in lieu thereof:

                  "(d) Minimum Consolidated Tangible Net Worth. The Borrower
            will not allow the Consolidated Tangible Net Worth to ever be less
            than the sum of (i) $48,000,000 U.S., plus (ii) as of the end of
            each fiscal quarter, 50% of Consolidated Net Income for such fiscal
            quarter then ended (but only if positive) and (iii) 75% of the net
            proceeds from the issuance of any equity securities after the
            Effective Date by Borrower's parent, excluding, in each instance,
            the effect of ceiling test write downs."

            (b) Subsection 13(e) of the Credit Agreement is hereby deleted in
      its entirety and the following inserted in lieu thereof:

                  "(e) Leverage Ratio. Borrower will not allow the ratio of
            Consolidated Debt to Consolidated Total Capital to ever be greater
            than 0.7 to 1.0 tested at the end of each fiscal quarter beginning
            with the fiscal quarter ending June 30, 2001, excluding the effect
            of ceiling test write downs."

            (c) Subsection 13(h) of the Credit Agreement is hereby deleted in
      its entirety and the following inserted in lieu thereof:

                  "(h) Restrictive Payments. Borrower will not declare or pay
            any cash dividend, purchase, redeem or otherwise acquire for value
            any of its stock now or hereafter outstanding, return any capital to
            its stockholders, or make any distribution of its assets to its
            stockholders except that Borrower may pay cash dividends to EXCO
            Resources, Inc. if, and only if, (i) immediately before and giving
            effect to any such dividend payment no Default or Event of Default
            shall exist, and (ii) the total amount of all such dividends are
            used by EXCO Resources, Inc. to purchase additional common stock
            issued by Borrower. Borrower will not retire, redeem or prepay prior
            to scheduled maturity any indebtedness other than obligations under
            this Agreement."

      5. The Borrower has requested a waiver of the Events of Default under the
terms of Sections 13(g) and (l) of the Credit Agreement which occurred as a
result of the loan made to

                                      -3-
<PAGE>

Borrower by its parent, EXCO Resources, Inc., to allow Borrower to repay
indebtedness owed the Lenders under the Credit Agreement and the Notes. Majority
Lenders hereby agree to waive any Events of Default that may have occurred under
Sections 13(g) and (l) of the Credit Agreement as a result of EXCO Resources,
Inc. loaning monies to prepay Borrower's obligations under the Credit Agreement
and the Note. This waiver is a waiver of the specific sections referred to
herein and is not a waiver of any other Default or Event of Default that may
have occurred under the provisions of the Credit Agreement.

      6. Except to the extent its provisions are specifically amended, modified
or superseded by this Second Amendment, the representations, warranties and
affirmative and negative covenants of the Borrower contained in the Credit
Agreement are incorporated herein by reference for all purposes as if copied
herein in full. The Borrower hereby restates and reaffirms each and every term
and provision of the Credit Agreement, as amended, including, without
limitation, all representations, warranties and affirmative and negative
covenants (except to the extent that such representations and warranties related
solely to an earlier date). Except to the extent its provisions are specifically
amended, modified or superseded by this Second Amendment, the Credit Agreement,
as amended, and all terms and provisions thereof shall remain in full force and
effect, and the same in all respects are confirmed and approved by the Borrower
and the Lenders.

      7. This Second Amendment shall be effective as of the date first above
written, but only upon the satisfaction of the conditions precedent set forth in
Paragraph 8 hereof (the "Second Amendment Effective Date").

      8. The obligations of Lenders under this Second Amendment shall be subject
to the following conditions precedent:

(a) Execution and Delivery. The Borrower shall have executed and delivered this
Second Amendment and other required documents, all in form and substance
satisfactory to the Agent;

            (b) Representations and Warranties. The representations and
      warranties of the Borrowers under this Second Amendment are true and
      correct in all material respects as of such date, as if then made (except
      to the extent that such representations and warranties related solely to
      an earlier date);

            (c) No Event of Default. No Event of Default shall have occurred and
      be continuing nor shall any event have occurred or failed to occur which,
      with the passage of time or service of notice, or both, would constitute
      an Event of Default.

            (d) Other Documents. The Agent shall have received such other
      instruments and documents incidental and appropriate to the transaction
      provided for herein as the Agent or its counsel may reasonably request,
      and all such documents shall be in form and substance satisfactory to the
      Agent;

                                      -4-
<PAGE>

            (e) Legal Matters. All legal matters incident to the consummation of
      the transactions contemplated hereby shall be reasonably satisfactory to
      special counsel for the Agent retained at the expense of Borrower.

      9. Borrower hereby represents and warrants that all factual information
heretofore and contemporaneously furnished by or on behalf of Borrower to Agent
for purposes of or in connection with this Second Amendment does not contain any
untrue statement of a material fact or omit to state any material fact necessary
to keep the statements contained herein or therein from being materially
misleading. Each of the foregoing representations and warranties shall
constitute a representation and warranty of Borrower made under the Credit
Agreement, and it shall be an Event of Default if any such representation and
warranty shall prove to have been incorrect or false in any material respect at
the time given. Each of the representations and warranties made under the Credit
Agreement (including those made herein) shall survive and not be waived by the
execution and delivery of this Second Amendment or any investigation by Lenders.

      10. The Borrower agrees to indemnify and hold harmless the Lenders and
their respective officers, employees, agents, attorneys and representatives
(singularly, an "Indemnified Party", and collectively, the "Indemnified
Parties") from and against any loss, cost, liability, damage or expense
(including the reasonable fees and out-of-pocket expenses of counsel to the
Lender, including all local counsel hired by such counsel) ("Claim") incurred by
the Lenders in investigating or preparing for, defending against, or providing
evidence, producing documents or taking any other action in respect of any
commenced or threatened litigation, administrative proceeding or investigation
under any federal securities law, federal or state environmental law, or any
other statute of any jurisdiction, or any regulation, or at common law or
otherwise, which is alleged to arise out of or is based upon any acts, practices
or omissions or alleged acts, practices or omissions of the Borrower or its
agents or arises in connection with the duties, obligations or performance of
the Indemnified Parties in negotiating, preparing, executing, accepting,
keeping, completing, countersigning, issuing, selling, delivering, releasing,
assigning, handling, certifying, processing or receiving or taking any other
action with respect to the Loan Documents and all documents, items and materials
contemplated thereby even if any of the foregoing arises out of an Indemnified
Party's ordinary negligence. The indemnity set forth herein shall be in addition
to any other obligations or liabilities of the Borrower to the Lenders hereunder
or at common law or otherwise, and shall survive any termination of this Second
Amendment, the expiration of the Loan and the payment of all indebtedness of the
Borrower to the Lenders hereunder and under the Notes, provided that the
Borrower shall have no obligation under this section to the Lenders with respect
to any of the foregoing arising out of the gross negligence or willful
misconduct of the Lenders. If any Claim is asserted against any Indemnified
Party, the Indemnified Party shall endeavor to notify the Borrower of such Claim
(but failure to do so shall not affect the indemnification herein made except to
the extent of the actual harm caused by such failure). The Indemnified Party
shall have the right to employ, at the Borrower's expense, counsel of the
Indemnified Parties' choosing and to control the defense of the Claim. The
Borrower may at its own expense also participate in the defense of any Claim.
Each Indemnified Party may employ separate counsel in connection with any Claim
to the extent such Indemnified Party believes it reasonably prudent to protect
such Indemnified Party. The parties intend for the provisions of this Section to
apply to and protect each Indemnified Party from the consequences of strict
liability imposed or threatened to be imposed on any

                                      -5-
<PAGE>

Indemnified Party as well as from the consequences of its own negligence,
whether or not that negligence is the sole, contributing, or concurring cause of
any Claim.

      11. This Second Amendment may be executed in any number of counterparts
and all of such counterparts taken together shall be deemed to constitute one
and the same instrument.

      12. Guarantor's Execution. EXCO Resources, Inc. is executing this Second
Amendment in its capacity as the Guarantor for the purpose of acknowledging the
existence of this Second Amendment and consenting to the execution thereof by
Borrower. EXCO Resources, Inc. hereby acknowledges that the execution and
delivery of this Second Amendment shall in no way effect its liability under its
Guaranty and hereby ratifies and affirms its obligations under its Guaranty.

      13. WRITTEN CREDIT AGREEMENT. THE CREDIT AGREEMENT, AS AMENDED BY THIS
SECOND AMENDMENT REPRESENTS THE FINAL AGREEMENT BETWEEN AND AMONG 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 BETWEEN
AND AMONG THE PARTIES.

      IN WITNESS WHEREOF, the parties have caused this Second Amendment to
Credit Agreement to be duly executed as of the date first above written.

                               BORROWER:

                               ADDISON ENERGY INC.

                               By: /s/ J. DOUGLAS RAMSEY
                                   ---------------------------------------------
                                   J. Douglas Ramsey, Vice President

                               GUARANTOR:

                               EXCO RESOURCES, INC.

                               By: /s/ J. DOUGLAS RAMSEY
                                   ---------------------------------------------
                                   J. Douglas Ramsey, Vice President

                                      -6-
<PAGE>

                                LENDERS:

                                BANK ONE, NA, CANADA BRANCH (successor
                                by merger to Bank One Canada) as a
                                Lender and as Administrative Agent

                                By: /s/ MICHAEL N. TAM
                                   ------------------------------------------
                                Name: Michael N. Tam
                                     ----------------------------------------
                                Title: VP
                                      ---------------------------------------

                                BNP PARIBAS (CANADA)
                                as a Lender and as Documentation Agent

                                By: /s/ CHARLES RITCHIE
                                   ------------------------------------------
                                Name: Charles Ritchie
                                     ----------------------------------------
                                Title: Vice President, Energy & Project Finance
                                      ---------------------------------------

                                By: /s/ MICHAEL GOSSELIN
                                   ------------------------------------------
                                Name: Michael Gosselin
                                     ----------------------------------------
                                Title: Director, Energy & Project Finance
                                      ---------------------------------------

                                COMERICA BANK - CANADA

                                By: /s/ ROBERT ROSEN
                                   ------------------------------------------
                                Name: Robert Rosen
                                     ----------------------------------------
                                Title: VP
                                      ---------------------------------------

                                      -7-

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