Endeavour Prices Upsized Public Offering of 10 Million Shares of Common Stock

HOUSTON, March 25, 2011 - Endeavour International Corporation (NYSE: END) (LSE: ENDV) today
announces that it has priced its public offering of 10.0 million shares of
its common stock at a price to the public of $11.00 per share. The 10.0
million shares to be sold represent an increase over the previously-announced
8.0 million shares. Endeavour has granted the underwriters a 30-day option to
purchase up to 1.5 million shares of its common stock. The offering is
expected to settle and close on March 29, 2011, subject to customary closing
conditions. Endeavour intends to use the net proceeds from the offering to
retire all $81.3 million of its 6% Convertible Senior Notes due 2012. The
remaining net proceeds will be used for general corporate purposes.

Citigroup Global Markets Inc. is acting as sole book-running manager for
the offering. Canaccord Genuity Inc., C.K. Cooper & Company, Global Hunter
Securities, LLC and Rodman & Renshaw, LLC are acting as co-managers for the
offering. The offering will be made only by means of a preliminary prospectus
supplement and related base prospectus, copies of which may be obtained from:

                         Citigroup Global Markets Inc.
                       Attention: Prospectus Department
                            Brooklyn Army Terminal
                          140 58th Street, 8th Floor
                              Brooklyn, NY 11220
                             Phone: +1-800-831-9146
                          batprospectusdept@citi.com

A copy of the preliminary prospectus supplement and base prospectus may
also be obtained at no charge at the Securities and Exchange Commission's
website, at www.sec.gov.

This press release is neither an offer to sell, nor a solicitation of an
offer to buy, nor shall there be any sale of these securities in any
jurisdiction in which such offer, solicitation or sale would be unlawful
prior to registration or qualification under the securities laws of any such
jurisdiction. A registration statement, as amended, relating to the
securities has been filed with the Securities and Exchange Commission and was
declared effective on February 9, 2010.

Endeavour International Corporation is an independent oil and gas company
engaged in the production, exploration, development and acquisition of crude
oil and natural gas in the U.S. and the North Sea.

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.

Investors are urged to also consider closely the disclosure in our
filings with the SEC, available from our website at
www.endeavourcorp.com. Endeavour is also subject to the requirements
of the London Stock Exchange and considers the disclosures in this release to
be appropriate and/or required under the guidelines of that exchange.

Endeavour - Investor Relations, Mike Kirksey, +1-713-307-8788, or Darcey Matthews, +1-713-307-8711, or Pelham Bell Pottinger - UK Media, Philip Dennis, +44 (0)207 861 3919, or Henry Lerwill, +44(0)207 861 3169