UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G
Under the Securities Exchange Act of 1934
(Amendment No. 4)*

Endeavour International Corporation

(Name of Issuer)

Common Stock, $0.001 par value per share

(Title of Class of Securities)

29259G101

(CUSIP Number)

December 31, 2009

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

ý Rule 13d-1(b)

ý Rule 13d-1(c)

¨ Rule 13d-1(d)

*The remainder of this cover page shall be filled out for a reporting person’s initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter the disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be deemed to be “filed” for the purpose of Section 18 of the Securities Exchange Act of 1934 (“Act”) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

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(1)	Names of Reporting Persons.				STEELHEAD PARTNERS, LLC
(2)	Check the Appropriate Box if a Member of a Group (See Instructions)					(a)     £ (b)     £
(3)	SEC Use Only
(4)	Citizenship or Place of Organization					Delaware
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH			(5)	Sole Voting Power		12,306,500
			(6)	Shared Voting Power		0
			(7)	Sole Dispositive Power		12,306,500
			(8)	Shared Dispositive Power		0
(9)		Aggregate Amount Beneficially Owned by Each Reporting Person				12,306,500
(10)		Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions)				¨
(11)		Percent of Class Represented by Amount in Row (9)				9.4%
(12)		Type of Reporting Person (See Instructions)				IA

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(1)	Names of Reporting Persons.				JAMES MICHAEL JOHNSTON
(2)	Check the Appropriate Box if a Member of a Group (See Instructions)					(a)     £ (b)     £
(3)	SEC Use Only
(4)	Citizenship or Place of Organization					United States
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH			(5)	Sole Voting Power		0
			(6)	Shared Voting Power		12,306,500
			(7)	Sole Dispositive Power		0
			(8)	Shared Dispositive Power		12,306,500
(9)		Aggregate Amount Beneficially Owned by Each Reporting Person				12,306,500
(10)		Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions)				¨
(11)		Percent of Class Represented by Amount in Row (9)				9.4%
(12)		Type of Reporting Person (See Instructions)				IN/HC

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(1)	Names of Reporting Persons.				BRIAN KATZ KLEIN
(2)	Check the Appropriate Box if a Member of a Group (See Instructions)					(a)     £ (b)     £
(3)	SEC Use Only
(4)	Citizenship or Place of Organization					United States
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH			(5)	Sole Voting Power		0
			(6)	Shared Voting Power		12,306,500
			(7)	Sole Dispositive Power		0
			(8)	Shared Dispositive Power		12,306,500
(9)		Aggregate Amount Beneficially Owned by Each Reporting Person				12,306,500
(10)		Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions)				¨
(11)		Percent of Class Represented by Amount in Row (9)				9.4%
(12)		Type of Reporting Person (See Instructions)				IN/HC

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(1)	Names of Reporting Persons.				STEELHEAD NAVIGATOR MASTER, L.P.
(2)	Check the Appropriate Box if a Member of a Group (See Instructions)					(a)     £ (b)     £
(3)	SEC Use Only
(4)	Citizenship or Place of Organization					Bermuda
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH			(5)	Sole Voting Power		12,306,500
			(6)	Shared Voting Power		0
			(7)	Sole Dispositive Power		12,306,500
			(8)	Shared Dispositive Power		0
(9)		Aggregate Amount Beneficially Owned by Each Reporting Person				12,306,500
(10)		Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions)				¨
(11)		Percent of Class Represented by Amount in Row (9)				9.4%
(12)		Type of Reporting Person (See Instructions)				PN

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Item 1(a).  Name of Issuer:

Endeavour International Corporation

Item 1(b).  Address of Issuer’s Principal Executive Offices:

1001 Fannin Street, Suite 1600

Houston, TX 77002

Item 2(a).  Names of Persons Filing:

Steelhead Partners, LLC (“Steelhead”)

James Michael Johnston

Brian Katz Klein

Steelhead Navigator Master, L.P. (“Navigator”)

Item 2(b).  Address of Principal Business Office or, if none, Residence:

The business office address of each reporting person is:

1301 First Avenue, Suite 201

Seattle, WA  98101

Item 2(c).  Citizenship:

Reference is made to Item 4 of pages 2, 3, 4  and 5 of this Schedule 13G (this “Schedule”), which Items are incorporated by reference herein.

Item 2(d).  Title of Class of Securities:

Common Stock, $0.001 par value per share.

Item 2(e).  CUSIP Number:

29259G101

Item 3.      If this statement is filed pursuant to §§240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:

¨     (a)      Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o).

¨     (b)      Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c).

¨     (c)      Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c).

¨     (d)      Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C 80a-8).

ý     (e)      An investment adviser in accordance with §240.13d-1(b)(1)(ii)(E);

¨      (f)      An employee benefit plan or endowment fund in accordance with §240.13d-1(b)(1)(ii)(F);

ý      (g)      A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);

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¨      (h)      A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act
                     (12 U.S.C. 1813);

¨      (i)     A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);

¨      (j)      Group, in accordance with §240.13d-1(b)(1)(ii)(J).

Item 4.     Ownership.

Reference is hereby made to Items 5-9 and 11 of pages 2, 3, 4 and 5 of this Schedule, which Items are incorporated by reference herein.

The securities reported on this Schedule as beneficially owned by Steelhead (the “Securities”) are held by or for the benefit of Navigator and certain other client accounts.  Steelhead, as the investment manager of Navigator, the general partner and/or investment manager of those other client accounts, and as the sole member of Navigator’s general partner, and each of J. Michael Johnson and Brian K. Klein, as the member-managers of Steelhead, may be deemed to beneficially own the Securities held by Navigator and such other client accounts for the purposes of Rule 13d-3 under the Securities Exchange Act of 1934 (the “Act”), insofar as they may be deemed to have the power to direct the voting or disposition of those Securities. 

Neither the filing of this Schedule nor any of its contents shall be deemed to constitute an admission that any of Steelhead, Mr. Johnson or Mr. Klein is, for any other purpose, the beneficial owner of any of the Securities, and each of Steelhead, Mr. Johnson and Mr. Klein disclaims beneficial ownership as to the Securities, except to the extent of his or its pecuniary interests therein.

Under the definition of “beneficial ownership” in the Act, it is also possible that the individual general partners, executive officers, and members of the foregoing entities might be deemed the “beneficial owners” of some or all of the Securities insofar as they may be deemed to share the power to direct the voting or disposition of such Securities.  Neither the filing of this Schedule nor any of its contents shall be deemed to constitute an admission that any of such individuals is, for any purpose, the beneficial owner of any of the Securities, and such beneficial ownership is expressly disclaimed.

The calculation of percentage of beneficial ownership in Item 11 of pages 2, 3, 4 and 5 was derived from the Issuer’s Form 10-Q filed with the Securities and Exchange Commission on November 6, 2009, in which the Issuer stated that the number of shares of its Common Stock outstanding as of November 6, 2009 was 131,150,229 shares.

Item 5.     Ownership of Five Percent or Less of a Class

Not applicable.

Item 6.     Ownership of More than Five Percent on Behalf of Another Person.

Not applicable.

Item 7.     Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on By the Parent Holding Company

Not applicable.

Item 8.     Identification and Classification of Members of the Group

Not applicable.

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Item 9.     Notice of Dissolution of Group

Not applicable.

Item 10.    Certification

By signing below the undersigned certify that, to the best of their knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect.

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Signature

After reasonable inquiry and to the best of my knowledge and belief, the undersigned certifies that the information set forth in this statement is true, complete and correct.

Dated:  January 29, 2010	STEELHEAD PARTNERS, LLC By:    /s/ James Michael Johnston                                     James Michael Johnston Its Member-Manager
	JAMES MICHAEL JOHNSTON /s/ James Michael Johnston                                               James Michael Johnston
	BRIAN KATZ KLEIN /s/ Brian Katz Klein                                                              Brian Katz Klein

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By signing below the undersigned certifies that, to the best of its knowledge and belief, the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect.

Signature

After reasonable inquiry and to the best of its knowledge and belief, the undersigned certifies that the information set forth in this statement is true, complete and correct.

Dated:  January 29, 2010 STEELHEAD NAVIGATOR MASTER, L.P. By:  Steelhead Partners, LLC, its Investment Manager



By:    /s/ James Michael Johnston                                     James Michael Johnston Its Member Manager  

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EXHIBITS LIST

Exhibit A            Joint Filing Undertaking           Page 12

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EXHIBIT A

JOINT FILING UNDERTAKING

The undersigned, being authorized thereunto, hereby execute this agreement as an exhibit to this Schedule 13G to evidence the agreement of the below-named parties, in accordance with rules promulgated pursuant to the Securities Exchange Act of 1934, to file this Schedule, as it may be amended, jointly on behalf of each of such parties.

Dated:  January 29, 2010	STEELHEAD PARTNERS, LLC By:    /s/ James Michael Johnston                                     James Michael Johnston Its Member-Manager
	STEELHEAD NAVIGATOR MASTER, L.P. By:  Steelhead Partners, LLC, its Investment Manager By:    /s/ James Michael Johnston                                     James Michael Johnston Its Member Manager
	JAMES MICHAEL JOHNSTON /s/ James Michael Johnston                                               James Michael Johnston
	BRIAN KATZ KLEIN /s/ Brian Katz Klein                                                              Brian Katz Klein

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