Exhibit 10.13(c)
 To:
    
    Endeavour International Corporation and each of the other ObligorsFrom:
    
    BNP Paribas (as Agent and Security Trustee)Date:
    
    5 February 2010
  $225,000,000 revolving loan and letter of credit facility agreement dated 30 October 2006 between,
among others, Endeavour International Corporation and BNP Paribas (as amended from time to time)
(the Facility Agreement)
 1.
    
    INTRODUCTION1.1
    
    GeneralWe refer to the Facility Agreement. We also refer to Companys recent request for relevant
consents to be provided under the Facility Agreement and/or the Intercreditor Agreement in
order for the Junior Facility and the New Security to be effected.1.2
    
    Definitions and construction
 1.2.1
    
    Unless otherwise defined in this letter, terms defined in the Facility
Agreement (whether expressly or by incorporation) shall have the same meaning when used
in this letter.1.2.2
    
    Unless otherwise specified, references in this letter to clauses are
references to clauses of the Facility Agreement.1.2.3
    
    In this letter:Existing Second Lien Credit Agreementmeans the Second Lien Credit Agreement (as
defined under the Intercreditor Agreement before the same is amended pursuant to
paragraph 2.3.2 (Conditions) below).Intercreditor Amendmentmeans each amendment to the Intercreditor Agreement which
is highlighted in the blacklined version of the Intercreditor Agreement set out in
Appendix 2 hereto.Junior Facilitymeans a junior credit facility for an aggregate principal amount
of $25,000,000 provided by the lenders thereto (being, as at the date of this
letter, Bank of Scotland plc) to the Company and certain of its Affiliates on the
terms summarised in the Termsheet.New Securitymeans Security granted in favour of the Security Trustee over the
same assets that are the subject of the Security which has (i) been constituted by
the existing Security Documents and (ii) not been released before the date of this
letter by the Security Trustee pursuant to the Finance Documents.Termsheetmeans the termsheet set out in Appendix 1 hereto.
 2.
    
    CONSENTS2.1
    
    Facility AgreementWe confirm in our capacity as Agent, subject to paragraph 2.3 (Conditions) below, that:
 2.1.1
    
    the Majority Lenders have consented, under clause 23.4.2(G) (Negative pledge),
to the grant of the New Security;




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2.1.2
    
    the Majority Lenders have consented, under clause 23.6.2(H) (Financial
Indebtedness) to the Junior Facility being effected;2.1.3
    
    the Majority Creditors have agreed, notwithstanding clause 23.7 (Credits and
guarantees), that each guarantor under the Junior Facility may give the lenders and the
other finance parties under the Junior Facility a guarantee in respect of the Financial
Indebtedness and other liabilities arising under the Junior Facility; and2.1.4
    
    the Majority Lenders have agreed, notwithstanding Clause 23.21.2
(Distributions), that the Junior Facility may restrict the ability of the Obligors and
members of the Group to declare, make or pay any dividend, distribution or other
payment referred to in Clause 23.21.1 (Distributions).
 2.2
    
    Intercreditor Agreement
 2.2.1
    
    We understand that the Junior Facility will be effected by the entry of the
parties thereto of an amendment and restatement agreement (the ARA) pursuant to which
the terms of the Existing Second Lien Credit Agreement are, or will be, amended and
restated.2.2.2
    
    We confirm in our capacity as Agent and Security Trustee, subject to paragraph
2.3 (Conditions), that:
 (A)
    
    the Majority First Lien Lenders have consented under clause
8.2 (Second Lien Documents) of the Intercreditor Agreement to the amendments
to the Existing Second Lien Credit Agreement that are, or to be, effected
under the ARA in so far as such amendments result in the Junior Facility being
effected on terms summarised in the Termsheet;(B)
    
    the relevant quorum of Secured Creditors (other than the
Second Lien Lenders) has consented to the Intercreditor Amendments.
 2.3
    
    Conditions
 2.3.1
    
    On the date of this letter, the definition of Final Maturity Dateset out in
clause 1.1 (Definitions) shall be deleted in its entirety and replaced with the
following:
 Final Maturity Datemeans the earlier of 31 January 2011 and the Reserve
Tail Date.
 2.3.2
    
    The Intercreditor Amendments shall be made to the Intercreditor Agreement on
the date of the ARA and, accordingly, the Intercreditor Agreement (as amended) shall
govern (i) the relationship between the Creditors under the Junior Facility and the
other Secured Creditors and (ii) the ability of the Creditors under the Junior Facility
to take any action with respect to the New Security.2.3.3
    
    The Obligors shall pay, on or before the three Business Day after the date of
this letter, to the Agent (for the account of each Lender) a fee equal to 0.20% of that
Lenders Commitment as at the date of this letter.
 3.
    
    GENERAL3.1
    
    Governing lawThis letter and any non-contractual obligations arising out of or in connection with it are
governed by English law.3.2
    
    Miscellaneous
 3.2.1
    
    This letter is a Finance Document.




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3.2.2
    
    This letter may be executed in any number of counterparts, and this has the
same effect as if signatures in the counterparts were on a single copy of this letter.3.2.3
    
    Please confirm your agreement to the terms of this letter by counter-signing
this letter or a copy of it.
  /s/ Remi Collonges-Duflouleur

For and on behalf of
    
    /s/ Aurelie GuthBNP PARIBAS (AS AGENT AND SECURITY TRUSTEE)WE AGREE TO THE TERMS OF THIS LETTER./s/ J. Michael Kirksey

For and on behalf ofENDEAVOUR INTERNATIONAL CORPORATION/s/ J. Michael Kirksey

For and on behalf ofENDEAVOUR OPERATING CORPORATION/s/ J. Michael Kirksey

For and on behalf ofENDEAVOUR ENERGY NEW VENTURES INC. COMPANY/s/ J. Michael Kirksey

For and on behalf ofEND MANAGEMENT COMPANY




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/s/ J. Michael Kirksey

For and on behalf ofENDEAVOUR ENERGY NORTH SEA, L.P./s/ J. Michael Kirksey

For and on behalf ofENDEAVOUR ENERGY NORTH SEA LLC/s/ J. Michael Kirksey

For and on behalf ofENDEAVOUR INTERNATIONAL HOLDING B.V./s/ J. Michael Kirksey

For and on behalf ofENDEAVOUR ENERGY NETHERLANDS B.V./s/ J. Michael Kirksey

For and on behalf ofENDEAVOUR ENERGY UK LIMITED/s/ J. Michael Kirksey

For and on behalf ofENDEAVOUR NORTH SEA LIMITED