Endeavour Announces Both Wells on Production at Rochelle

Endeavour Announces Both Wells on Production at Rochelle Field HOUSTON, May 21, 2014 -- Endeavour International Corporation (NYSE: END) (LSE: ENDV)("Endeavour" or the "Company") today announced that the West Rochelle W1 well has been returned toproduction. Both West and East Rochelle wells are now flowing together and Rochelle production will beoptimized between the two wells in the coming days. The Company may update production guidance forthe second quarter, once stabilized production rates have been achieved. The Rochelle field came online in October of 2013. Endeavour has a 44% working interest and the field islocated in UKCS Blocks 15/26b, 15/26c and 15/27. Endeavour International Corporation is an international oil and gas exploration and production companyfocused on the acquisition, exploration and development of energy reserves in the North Sea and UnitedStates. For more information, visit www.endeavourcorp.com. SOURCE Endeavour International Corporation CONTACT: Endeavour - Investor Relations, Darcey Matthews, 713-307-8711; Pelham Public Relations -UK Media, Philip Dennis, +44 (0)207 861 3919, Henry Lerwill, +44 (0)207 861 3169