Endeavour Announces $250 Million Offering of Senior Notes

HOUSTON, June 7, 2011 -

Endeavour International Corporation (NYSE: END) (LSE: ENDV) today
announced that it intends to offer, subject to market and other conditions,
up to $250 million aggregate principal amount of its senior notes due 2016 in
a private placement to eligible purchasers.

The Company intends to use the net proceeds from the offering to repay
all amounts outstanding under its 15% Senior Term Loan due 2013, to redeem or
repurchase its 12% Subordinated Notes due 2014 and for general corporate
purposes.

This press release is neither an offer to sell nor the solicitation of an
offer to buy the notes or any other securities. The notes will be offered in
the United States only to qualified institutional buyers in reliance on Rule
144A under the Securities Act of 1933 (the "Securities Act") and outside the
United States in reliance on Regulation S under the Securities Act. The notes
have not been registered under the Securities Act and may not be offered or
sold in the United States without registration or an applicable exemption
from registration requirements. This announcement is being issued pursuant to
Rule 135c under the Securities Act and shall not constitute an offer to sell
or the solicitation of an offer to buy any securities.

This press release contains forward-looking statements within the meaning
of Section 27A of the Securities Act of 1933 and Section 21E of the
Securities Exchange Act of 1934. These forward-looking statements include
statements that express a belief, expectation, or intention, as well as those
that are not statements of historical fact, and may include projections and
estimates concerning the timing and success of specific projects and our
future production, revenues, income and capital spending. Our forward-looking
statements are generally accompanied by words such as "estimate," "project,"
"predict," "believe," "expect," "anticipate," "potential," "plan," "goal" or
other words that convey the uncertainty of future events or outcomes. We
caution you not to rely on them unduly. We have based these forward-looking
statements on our current expectations and assumptions about future events.
While our management considers these expectations and assumptions to be
reasonable, they are inherently subject to significant business, economic,
competitive, regulatory and other risks, contingencies and uncertainties,
most of which are difficult to predict and many of which are beyond our
control. These risks, contingencies and uncertainties, which may not be
exhaustive, relate to, among other matters, the following: discovery,
estimation, development and replacement of oil and gas reserves; decreases in
proved reserves due to technical or economic factors; drilling of wells and
other planned exploitation activities; timing and amount of future production
of oil and gas; the volatility of oil and gas prices; availability and terms
of capital; operating costs such as lease operating expenses, administrative
costs and other expenses; our future operating or financial results; amount,
nature and timing of capital expenditures, including future development
costs; cash flow and anticipated liquidity; availability of drilling and
production equipment; uncertainties related to drilling and production
operations in a new region; cost and access to natural gas gathering,
treatment and pipeline facilities; business strategy and the availability of
acquisition opportunities; and factors not known to us at this time. Any of
these factors, or any combination of these factors, could materially affect
our future financial condition or results of operations and the ultimate
accuracy of a forward-looking statement. The forward-looking statements are
not guarantees of our future performance, and our actual results and future
developments may differ materially from those projected in the
forward-looking statements. In addition, any or all of our forward-looking
statements included in this release may turn out to be incorrect. They can be
affected by inaccurate assumptions we might make or by known or unknown risks
and uncertainties, including those included in our Annual Report on Form 10-K
for the year ended December 31, 2010.

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

Endeavour - Investor Relations, Mike Kirksey, +1-713-307-8700, or Darcey Matthews, +1-713-807-8711