Exhibit 10.1
 To:
    
    The Obligors (as defined in the Agreement)From:
    
    BNP Paribas as Agent and Security TrusteeDate:
    
    July 2010
  RE: A $225,000,000 SECURED REVOLVING LOAN AND LETTER OF CREDIT FACILITY AGREEMENT dated 30 October
2006 and made between, among others, ENDEAVOUR INTERNATIONAL CORPORATION (the Company); BNP
PARIBAS (in various capacities including as Agent and Security Trustee); and BANK OF SCOTLAND PLC
(previously THE GOVERNOR AND COMPANY OF THE BANK OF SCOTLAND) (in various capacities), as amended
from time to time (the Agreement).
 1.
    
    INTRODUCTIONWe refer to the Agreement. Terms defined in the Agreement (whether expressly or by
incorporation) have the same meaning in this letter unless given a different meaning in
this letter.2.
    
    CONSENTSWe confirm that, as of the date of this letter, the Majority Lenders have consented to:2.1
    
    the amendment of Clause 24.3 (Current Ratio) of the Agreement, in the case only of the
Measurement Period ending on 30 June 2010, to require the Company to ensure that the Current
Ratio on the last day of the Measurement Period ending on 30 June 2010 is greater than 0.6:1;2.2
    
    the amendment of Clause 24.4 (Gearing) of the Agreement, in the case only of the Measurement
Period ending on 30 June 2010, to require the Company to ensure that the ratio of (1)
Consolidated Total Net Borrowings to (2) Consolidated EBITDA on the last day of the
Measurement Period ending on 30 June 2010, is less than or equal to 4.5:1;2.3
    
    the inclusion of a new Event of Default in the Agreement by:
 2.3.1
    
    the insertion as a new Clause 25.24 (Refinancing) in the Agreement as follows:25.24
    
    Refinancing
 The Company does not:
 25.24.1
    
    prepay all outstanding Utilisations (together with all accrued interest
and all other amounts which are payable under the Finance Documents) in
accordance with the terms of this Agreement; and
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25.24.2
    
    cancel the Facility in its entirety in accordance with the terms of this
Agreement,
 in each case, on or before 30 September 2010.2.3.2
    
    the insertion of the following in Clause 25.1 (General) of the Agreement
after (inclusive):and Clause 25.24 (Refinancing).
 3.
    
    MISCELLANEOUS3.1
    
    Save as expressly provided in this letter, no provision of any Finance Document is waived,
amended or otherwise modified and the waivers and amendments contemplated in this letter shall
be without prejudice to the rights and remedies of the Finance Parties with respect to any
other matters.3.2
    
    This letter is a Finance Document.3.3
    
    This letter may be executed in any number of counterparts and this has the same effect as if
the signatures on the counterparts were on a single copy of this letter.3.4
    
    This letter, and any non-contractual obligations arising out of or connection with this
letter, shall be governed by and construed in accordance with, English law.3.5
    
    Please confirm your acceptance of the terms of this letter by counter-signing this letter or
a copy of it.
 Yours faithfullyAuthorised signatory forBNP PARIBAS(as Agent and Security Trustee)We agree to the terms of this letter:J. Michael KirkseyAuthorised signatory forENDEAVOUR INTERNATIONAL CORPORTATIONJ. Michael KirkseyAuthorised signatory for
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ENDEAVOUR OPERATING CORPORATIONJ. Michael KirkseyAuthorised signatory forENDEAVOUR ENERGY NEW VENTURES INC.J. Michael KirkseyAuthorised signatory forEND MANAGEMENT COMPANYJ. Michael KirkseyAuthorised signatory forENDEAVOUR INTERNATIONAL HOLDING B.V.J. Michael KirkseyAuthorised signatory forENDEAVOUR ENERGY NETHERLANDS B.V.J. Michael KirkseyAuthorised signatory forENDEAVOUR ENERGY UK LIMITEDJ. Michael KirkseyAuthorised signatory forENDEAVOUR NORTH SEA LIMITED
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J. Michael KirkseyAuthorised signatory forENDEAVOUR ENERGY NORTH SEA LLCJ. Michael KirkseyAuthorised signatory forENDEAVOUR ENERGY NORTH SEA LP
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