ENDV Endeavour International Corporation

                           Endeavour Announces Settlement of SM Energy Litigation

HOUSTON, April 16, 2014 -- Endeavour International Corporation (NYSE: END) (LSE: ENDV) today announced
that a settlement has been reached with SM Energy regarding litigation filed against Endeavour Operating
Corporation in December 2011.

In July 2011, Endeavour entered into agreements with SM Energy for the purchase of oil and gas leases,
producing properties, geophysical data, a pipeline and related assets in the Marcellus shale play in Pennsylvania
for an aggregate consideration of approximately $110 million. In December 2011, Endeavour terminated the
agreements based upon its conclusion that title defects to the properties exceeded contractual thresholds and the
pipeline was not in compliance with regulatory standards. Late that month, SM Energy filed a lawsuit against the
Company and a counter claim was made in January 2012 by Endeavour. On April 16, 2014 the parties reached
an agreement to settle the outstanding litigation.

In accordance with the settlement agreement, Endeavour will pay SM Energy $5 million and issue a note for $4.5
million. The note will be paid in three graduated payments beginning in twelve months. Endeavour has also
agreed to issue warrants valued at $3.75 million (approximately 2.13 million shares with a strike price of $5.29.)
The total settlement expense to be recorded will be $19.25 million, which includes deposits of $6 million paid prior
to the execution of the agreements.

Endeavour International Corporation is an oil and gas exploration and production company focused on the
acquisition, exploration and development of oil and natural gas in the North Sea and the United States. For more
information, visit www.endeavourcorp.com .

SOURCE  Endeavour International Corporation

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