Endeavour to Host Operational Update Call

Endeavour Announces Operational Update Conference Call and Webcast HOUSTON, July 9, 2013 -- Endeavour International Corporation (NYSE: END) (LSE: ENDV) will host aconference call and webcast to provide an update on its U.K. and U.S operations on Wednesday, July 10, 2013 at7:30 a.m. Central Time, 1:30 p.m. British Summer Time. To participate and ask questions during the conference call, dial the local country telephone number and theconfirmation code 2363667. The toll-free numbers are 888-523-1228 in the United States and 0-808-404-7655 inthe United Kingdom. Other international callers should dial 719-457-2648 (tolls apply). To listen to the live audio webcast, please access Endeavour's home page at www.endeavourcorp.com. A replayof the webcast will be available beginning at 12:00 p.m. Central Time on July 10, 2013 through 12:00 p.m. onJuly 17, 2013 by dialing toll free 888-203-1112 (U.S.) or 719-457-0820 (international), confirmation code 2363667. Endeavour International Corporation is an international oil and gas exploration and production company focusedon the acquisition, exploration and development of energy reserves in the North Sea and United States. For moreinformation, visit www.endeavourcorp.com.

CONTACT: Endeavour - Investor Relations, Darcey Matthews, +1-713-307-8711