X0305 4 2012-06-18 1 0001112412 ENDEAVOUR INTERNATIONAL CORP END 0001385897 STEELHEAD NAVIGATOR MASTER, L.P. MINTFLOWER PLACE, 4TH FLOOR 8 PAR-LA-VILLE ROAD HAMILTON D0 HM 08 BERMUDA 0 0 0 1 Former 10% Owner See Remark(1) (1) The reporting person is filing this Form 4 voluntarily to indicate that it is exiting from Section 16 reporting effective as of June 18, 2012 per General Instruction 1(b) to Form 4. Steelhead Navigator Master, L.P.; By: Steelhead Partners, LLC, its Investment Manager; By: Brent Binge, General Counsel; /s/ Brent Binge 2012-06-22