Endeavour Announces UK Executive Retirement and Management Changes

HOUSTON, September 22, 2010 - Endeavour International Corporation (NYSE-Amex: END) (LSE: ENDV)
announced today that John G. Williams, executive vice president -
exploration, will retire effective September 30, 2010. Since joining
Endeavour in 2007, he has been a member of the company's executive committee
assigned to the company's London office as head of exploration. He will
continue his association with the company in a consulting capacity throughout
the remainder of the year.

In conjunction with the retirement of Williams, the company announces
that it will combine its UK exploration and operations teams into a single
operating group. Carl D. Grenz, currently executive vice president of
operations, will assume responsibility for all UK operations as executive
vice president - international and continue to serve on the company's
executive management committee.

As part of the reorganization of the UK operations, Endeavour named Jim
Munns to the new role of Director of Regulatory Affairs, expanding on his
previous responsibilities with DECC and other regulatory groups relevant to
Endeavour's efforts in the North Sea. Nick Terrell will become Director of
Exploration responsible for the company's exploration activities in the UK.
Both will report directly to Mr. Grenz.

The company also announced that it will form a new committee of the board
entitled "Technology and Reserves." The committee, chaired by John N. Seitz,
vice chairman and co-founder of Endeavour, will support the board providing
increased focus on emerging technologies in the upstream industry and
oversight of the company's reserve evaluation and reporting processes.

William L. Transier, chairman, chief executive officer and president,
said:

"John Williams has played a key role in helping the company build its
presence in the North Sea. His exploration expertise and knowledge of the
region have been invaluable as we developed an effective strategy for
managing our portfolio in the region. John has been an important member of
our executive team, and we wish him the very best during his retirement.

Carl Grenz has tremendous experience in managing new developments in the
North Sea. Under our new geographic organization and with Carl's leadership,
Endeavour will continue to focus on production and growth in the UK."

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

Certain statements in this news release should be regarded as
"forward-looking" statements within the meaning of the securities laws. These
statements speak only as of the date made. Such statements are subject to
assumptions, risk and uncertainty. Actual results or events may vary
materially. The estimates of recoverable resources per well and completed
well costs included herein are based upon other typical results in these
shale plays and may not be indicative of actual results.

Endeavour - Investor Relations - Mike Kirksey, +44-0-207-451-2381, or +1-713-307-8700, or Darcey Matthews, +1-713-307-8711; or Pelham Public Relations - UK Media - Philip Dennis, +44-0-207-743-6363, or Henry Lerwill, +44-0-203-178-6242