ENDV.L Regulatory News (ENDV)

Endeavour Announces 2012 Fourth Quarter and Year-End Financial and Operational Results

HOUSTON, March 6, 2013 - Endeavour International Corporation (NYSE: END) (LSE: ENDV) today reported fourthquarter 2012 net loss, as adjusted of $7.7 million compared to a net loss, as adjusted of$5.8 million for 2011. On a GAAP basis, net loss for the fourth quarter of 2012 was $6.5million as compared to net loss of $44.6 million for the same quarter in 2011. Sales volumes for the 2012 fourth quarter period were 11,541 boepd, compared to 4,253boepd for the same quarter in the prior year. Physical production for the fourth quarterof 2012 averaged 10,300 barrels of oil equivalent per day ("boepd") compared toapproximately 4,100 boepd for the same quarter of 2011, representing a 151% increase. Fourth Quarter highlights include: - Finance:

- Completed an offering for an additional $54 million of the 12% First

Priority Notes due 2018 - Fully redeemed the $25 million 12% Senior Subordinated Notes - Operational: - Proved reserves in the U.K. increased 186% year-over-year - Drilling commenced and infrastructure substantially completed on the Rochelle development

- Completed an exchange of Haynesville assets for Pennsylvania Marcellus

assets Recent Events: - Strategic Review Process:

- The Board of Directors initiated a process to explore a broad range of

strategic alternatives to further enhance shareholder value - Current business focus remains on executing the operational plan - Management and Board Developments: - Catherine L. Stubbs named Chief Financial Officer - Ashok Nayyor resigns from the Board of Directors - Finance:

- Received $22.5 million through the forward sale of U.K. oil production

- Obtained an extension on the Revolving Credit Facility to midyear 2014

- Replaced or extended the Reimbursement Agreements to midyear 2014

- Entered into a Monetary Production Payment for $107.5 million to be

satisfied out of proceeds of production from Endeavour's U.K. North Sea assets

- Established 2013 Capex budget in the U.K. of $140 million - $150 million

- North Sea:

- Drilling commenced at West Rochelle after suspension of the East Rochelle

production well

- Bacchus third production well expected to commence drilling in March

- U.S. Onshore:

- Established a 23,000 acre Federal unit in Northwestern Colorado

"In 2012, the Company undertook two major development projects and a sizableacquisition resulting in increased oil production and reserves in the U.K. North Sea.Although the path to growth was challenging, we were able to manage through a series ofcomplex business transactions to close on the additional working interest at Alba andbring the Bacchus development on-line. We remain confident that Rochelle production willbe on-line soon demonstrating the quality of this important asset," said William L.Transier, chairman, chief executive officer and president. "Our ability to increase ourliquidity quickly shows the perseverance of our management team to handle unexpectedevents for the benefit of all stakeholders."

Strategic Review Process

On February 14, 2013 Endeavour announced the Board of Directors intent to review abroad range of strategic alternatives. The primary motivation of the strategic review isto accelerate the delevering of the balance sheet and unlock the underlying value of theassets. The options under consideration include: - a sale, joint venture or partnership in respect of the Company's activities in the North Sea; - a sale of specific assets; - a sale or merger of the Company; or - continuing to execute on the Company's operational plan. Tudor, Pickering, Holt & Co. and Lambert Energy Advisory Ltd. have been engaged as theCompany's financial advisors in this process. There is no assurance that the strategicalternatives review will result in Endeavour changing its current business plan orcompleting any such transaction.

Management Developments

Catherine "Cathy" Stubbs was named Chief Financial Officer for the Company on February14, 2013. She has over 20 years of experience in financial management in the energyindustry and eight years with Endeavour. Cathy has served in various roles of increasingresponsibility in corporate development, accounting and financial controls, and treasuryroles since the inception of Endeavour and most recently served as the senior vicepresident, finance. Ashok Nayyor resigned from the Board of Directors effective March 5, 2013. Mr. Nayyorjoined the Board in August of 2012 and he made a significant contribution during histenure as a board member. Finance Since year-end 2012, Endeavour has completed several transactions to improve theCompany's liquidity position and has extended the maturities of its Revolving CreditFacility, as well as the two Reimbursement Agreements to midyear 2014. In January, the Company entered into a new reimbursement arrangement to provide for areplacement Letter of Credit with an unaffiliated third party for $33 million andterminated its previous Reimbursement Agreement in the same amount. The new agreement,which secures the Company's decommissioning obligations in connection with the specificassets in the U.K. North Sea, matures in July of 2014. In February, Endeavour entered into a forward sale agreement with one of itsestablished purchasers and received a payment of approximately $22.5 million for aspecified volume of crude oil in excess of 200,000 barrels to be delivered over a sixmonth period from its U.K. North Sea production. In early March, the Company and its existing lenders agreed to extensions on theRevolving Credit Facility and the $120 million Reimbursement Agreement. $100 million ofthe $115 million outstanding on the Revolving Credit Facility was extended from October31, 2013 to June 30, 2014. The full amount of the $120 million Reimbursement Agreement wasextended from December 31, 2013 to June 30, 2014. Endeavour also entered into a Monetary Production Payment with a group of investorsfor the purchase price amount of $107.5 million. Closing is subject to the satisfaction ofstandard conditions, including regulatory approval in the United Kingdom. The MonetaryProduction Payment will be satisfied out of the production from certain U.K. North Seaassets and is expected to be satisfied over a two year period. For 2013, the Company anticipates a direct oil and gas capital expenditures budget inthe U.K. of $140 million to $150 million. Approximately sixty percent of the U.K. capitalbudget is being allocated to final drilling and completion of the Rochelle development, aswell as the third development well at Bacchus. Endeavour has also allocated $30 million to$40 million of its capital budget for its U.S. acreage with plans to spend approximatelyhalf of that capital in the Pennsylvania Marcellus area for infrastructure expansion andwell completions. The U.S. spend is primarily discretionary and will be evaluated onceRochelle production is on-line and after the completion of the strategic review process. The completion of these recent financing activities are designed to provide sufficientliquidity to bring the Rochelle development on line, drill the third well at Bacchus andallow sufficient time for a thoughtful and disciplined strategic review process. Operational Update United Kingdom In mid-February, the Transocean Prospect rig moved to the West Rochelle area andcommenced drilling of the production well. Estimated time to drill and complete the wellis approximately 120 days. At East Rochelle, analysis and testing of the cause of thenon-uniform hole around the conductor pipe is on-going. Once the analysis is concluded,the Company will be able to determine the optimal path forward for the completion of theEast Rochelle well. Endeavour anticipates drilling operations will re-commence at EastRochelle following first production at West Rochelle. A majority of the Rochelle subseainfrastructure has been installed at the field and the modification work to the Scottplatform is nearing completion. At the Bacchus development, the operator announced plans to commence drilling thethird production well in March. In 2012, the partnership drilled two of three plannedproduction wells. Due to the additional positive data gained from the second productionwell, the Bacchus partners decided to observe field results before proceeding forward withthe third well. Endeavour has a 30% working interest in the field. At Alba production volumes continue to be impacted by water handling issues. Thematter is being dealt with by the operator and it is anticipated that the asset willreturn to normal production levels during the year.

United States Onshore

During 2012, Endeavour maintained a disciplined capital approach in the U.S. For theyear, two gross wells were drilled and completed in the Louisiana Haynesville acreage,with all critical acreage currently held by production. Net daily production averaged 10.6MMCFe/D for the fourth quarter and 14.3 MMCFe/D for the full year 2012. In the fourth quarter of 2012, the Company closed an exchange of Haynesville assetsfor Pennsylvania Marcellus assets and obtained operatorship, while increasing theownership to100% working interest in 31,000 total net acres and all upstream and midstreamassets. In conjunction with the exchange, Endeavour secured an off-take solution inCameron County for up to an additional 10 mmcf/d of production by year-end 2013. TheCompany has three wells drilled and cased in the area waiting on completion. In the Montana Heath tight oil play, Endeavour deferred horizontal re-entries of itsvertical pilot wells to evaluate drilling and production results from offset operators. InNorthwest Colorado, the Company formed a 23,000 acre Federal unit with stacked UpperCretaceous targets and liquids-rich potential. An initial test well is planned for laterthis year. 2012 Reserves Year-over-year U.K. proved reserves increased 186%, with the Company's total provedreserves increasing 13%. Oil represented 54% of total proved reserves at December 31, 2012up from 18% at the end of the prior year due to the increased working interest in Alba andadditional reserves at the Bacchus field. Net proved and probable reserves increased 4.7%from the prior year, with oil representing 62% of the total up from 32% the year prior.There was a decline in the U.S. gas reserves as a result of decreasing natural gas prices. Endeavour Historical As of December 31, 2010 (3) 2011 2012 Net 1P reserves: United Kingdom: Oil (MBbls)(1) 3,967 4,060 13,733 Gas (MMcf) 56,267 50,723 56,901 Oil equivalents (MBOE)(2) 13,345 12,514 23,217 United States: Oil (MBbls)(1) 59 41 6 Gas (MMcf) 31,777 60,978 14,690 Oil equivalents (MBOE)(2) 5,355 10,204 2,454 Total: Oil (MBbls)(1) 4,026 4,101 13,739 Gas (MMcf) 88,044 111,701 71,591 Oil equivalents (MBOE)(2) 18,700 22,718 25,671 Percentage oil 22% 18% 54% Percentage proved developed 19% 23% 32% Net 2P reserves: Total: Oil (MBbls)(1) 14,897 14,556 29,208 Gas (MMcf) 172,820 182,989 107,715 Oil equivalents (MBOE)(2) 43,700 45,054 47,161 Percentage oil 34% 32% 62% (1) Includes natural gas liquids. (2) One Bbl of oil is equal to six Mcfe based on an approximate energy equivalency. This is a physical correlation and does not reflect a value or price relationship between the commodities. (3) Reserve information includes the purchase of the additional 20%

(approximately 3.4 mmboe of 2P reserves) of the Bacchus field in the

North Sea, which closed in February 2011.

Earnings Conference Call, Wednesday, March 6, 2013 at 9:00 a.m., Central Time, 3:00p.m. British Time

Endeavour International will host a conference call and web cast to discuss its 2012fourth quarter and year-end financial and operating results on Wednesday, March 6, 2013 at9 a.m. Central Time, 3 p.m. British Time. A supporting slide deck for the conference callis available on Endeavour's website at http://www.endeavourcorp.com. To participateand ask questions during the conference call, dial the local country telephone number andthe confirmation code 8741109. The toll-free numbers are 888-708-5695 in the United Statesand 0-808-101-7548 in the United Kingdom. Other international callers should dial913-312-1520 (tolls apply). To listen only to the live audio web cast access Endeavour'shome page at http://www.endeavourcorp.com. A replay will be available beginning at12:00 p.m. Central Time on March 6, 2013 through 12:00 p.m. on March 12, 2013 by dialingtoll free 888-203-1112 (U.S.) or 719-457-0820 (international), confirmation code 8741109. Endeavour International Corporation is an oil and gas exploration and productioncompany focused on the acquisition, exploration and development of energy reserves in theNorth Sea and the United States. For more information, visithttp://www.endeavourcorp.com.

Additional information for investors:

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 ofthe date made. Such statements are subject to assumptions, risk and uncertainty. Actualresults or events may vary materially. The Securities and Exchange Commission (SEC)permits oil and gas companies, in their filings with the SEC, to disclose not only provedreserves, but also probable reserves and possible reserves that meet the SEC's definitionsfor such terms, and price and cost sensitivities for such reserves, and prohibitsdisclosure of resources that do not constitute such reserves. We use may use certain termsin our news releases, such as "reserve potential," that the SEC's guidelines strictlyprohibit us from including in filings with the SEC. These estimates are by their naturemore speculative than estimates of proved, probable and possible reserves and accordinglyare subject to substantially greater risk of being actually realized. In addition, we donot represent that the probable or possible reserves described herein meet therecoverability thresholds established by the SEC in its new definitions. Investors areurged to also consider closely the disclosure in our filings with the SEC, available fromour website at http://www.endeavourcorp.com. Endeavour is also subject to therequirements of the London Stock Exchange and considers the disclosures in this release tobe appropriate and/or required under the guidelines of that exchange. Endeavour International Corporation Condensed Consolidated Balance Sheets (Unaudited) (Amounts in thousands) December December 31, 31, 2012 2011 Assets Current Assets: Cash and cash equivalents $ 59,185 $ 106,036 Restricted cash 178 - Accounts receivable 46,003 8,649 Prepaid expenses and other current assets 12,906 18,840 Total Current Assets 118,272 133,525 Property and Equipment, Net 1,003,441 549,196 Goodwill 262,764 211,886 Other Assets 49,906 30,384 Total Assets $ 1,434,383 $ 924,991 Liabilities and Stockholders' Equity

Current Liabilities:

Accounts payable $ 60,153 $ 62,275 Current maturities of debt 15,713 12,350 Accrued expenses and other 90,100 20,549 Total Current Liabilities 165,966 95,174 Long-Term Debt 843,793 455,028 Deferred Taxes 133,798 115,759 Other Liabilities 147,692 61,248 Total Liabilities 1,291,249 727,209

Commitments and Contingencies

Series C Convertible Preferred Stock 43,703

43,703

Stockholders' Equity 99,431

154,079

Total Liabilities and Stockholders' Equity $ 1,434,383 $ 924,991 Endeavour International Corporation Condensed Consolidated Statement of Operations (Unaudited) (Amounts in thousands, except per share data) Fourth Quarter Year Ended December 31, December 31, 2012 2011 2012 2011 Revenues $ 97,615 $ 16,632 $ 219,058 $ 60,091 Cost of Operations: Operating expenses 23,924 2,779 58,536 17,668 Depreciation, depletion and amortization 24,272 7,780 66,564 26,478 Impairment of U.S. oil and gas properties 5,956 36,913 53,072 65,706 General and administrative 5,705 3,328 21,085 17,853 Total Expenses 59,857 50,800 199,257 127,705 Income (Loss) From Operations 37,758 (34,168) 19,801 (67,614) Other Income (Expense): Derivatives: Unrealized gains (losses) 7,319 (2,719) 5,141 8,378 Interest expense (21,105) (12,688) (84,122) (44,893) Loss on early extinguishment of debt - - (21,661) (402) Letter of credit fees (9,461) - (21,903) - Interest income and other (3,313) 172 (9,254) 597 Total Other Expense (26,560) (15,235) (131,799) (36,320) Income (Loss) Before Income Taxes 11,198 (49,403) (111,998) (103,934) Income Tax Expense (Benefit) 17,652 (4,758) 14,228 27,061 Net Loss (6,454) (44,645) (126,226) (130,995) Preferred Stock Dividends 456 455 1,823 1,974 Net Loss to Common Stockholders $ (6,910) $ (45,100) $ (128,049) $ (132,969) Net Loss per Common Share: Basic and diluted $ (0.15) $ (1.15) $ (3.01) $ (3.70) Weighted Average Number of Common Shares Outstanding: Basic and diluted 46,613 39,231 42,533 35,957 Endeavour International Corporation Condensed Consolidated Statement of Cash Flows (Unaudited) (Amounts in thousands) Year Ended December 31, 2012 2011 Cash Flows from Operating Activities: Net loss $ (126,226) $

(130,995)

Adjustments to reconcile net loss to net cash provided by (used in) operating activities: Depreciation, depletion and amortization 66,564 26,478 Impairment of oil and gas properties 53,072 65,706 Deferred tax expense (benefit) (17,594) 21,116 Unrealized gains on derivatives (5,141) (8,378) Amortization of non-cash compensation 4,401 3,697 Amortization of loan costs and discount 14,179 12,234 Non-cash interest expense 8,684 12,811 Loss on early extinguishment of debt 21,661 402 Other 15,365 1,518 Changes in operating assets and liabilities 3,648 (43,932)

Net Cash Provided by (Used in) Operating

Activities 38,613

(39,343)

Cash Flows From Investing Activities:

Capital expenditures (246,925)

(165,062)

Acquisitions (238,854)

(33,075)

Proceeds from sales, net of cash 1,407 -

(Increase) decrease in restricted

cash (178)

31,726

Net Cash Used in Investing Activities (484,550) (166,411)

Cash Flows From Financing Activities:

(Repayments) borrowings under debt

agreements 379,394

106,775

Proceeds from issuance of common

stock 60,805

118,444

Dividends paid (1,665)

(1,816)

Payments for early extinguishment

of debt (7,248) - Financing costs paid (32,204)

(11,401)

Other financing 4

521

Net Cash Provided by Financing

Activities 399,086

212,523

Net Increase (Decrease) in Cash and Cash

Equivalents (46,851)

6,769

Cash and Cash Equivalents, Beginning of

Period 106,036

99,267

Cash and Cash Equivalents, End of Period $ 59,185 $ 106,036 Endeavour International Corporation Operating Statistics (Unaudited) Fourth Quarter Year Ended December 31, December 31, 2012 2011 2012 2011 Sales volume: Oil and condensate sales (Mbbls): United Kingdom 896 98 1,994 373 United States - 3 3 7 Total 896 101 1,997 380 Gas sales (MMcf): United Kingdom 22 16 91 94 United States 972 1,728 5,206 5,033 Total 994 1,744 5,298 5,127 Oil equivalent sales (MBOE) United Kingdom 899 101 2,009 388 United States 163 290 871 846 Total 1,062 391 2,880 1,234 Total BOE per day 11,541 4,253 7,868 3,382 Physical production volume (BOE per day): United Kingdom 8,533 925 5,494 1,095 United States 1,767 3,158 2,379 2,319 Total 10,300 4,083 7,873 3,414 Realized Prices: Oil and condensate price ($ per Bbl) $ 105.76 $ 110.93 $ 103.56 $ 109.20 Gas price ($ per Mcf) $ 2.86 $ 3.14 $ 2.32 $ 3.63 Equivalent oil price ($ per BOE) $ 91.94 $ 42.51 $ 76.07 $ 48.67 - We record oil revenues using the sales method, i.e. when delivery has occurred. Actual production may differ based on the timing of tanker liftings. We use the entitlements method to account for sales of gas production. - The average sales prices include gains and losses for derivative contracts we utilize to manage price risk related to our future cash flows. Endeavour International Corporation Reconciliation of GAAP to Non-GAAP Measures (Unaudited) (Amounts in thousands) As required under Regulation G of the Securities Exchange Act of 1934, provided below are reconciliations of net income (loss) to the following non-GAAP financial measures: net income, as adjusted and Adjusted EBITDA. We use these non-GAAP measures as key metrics for our management and to demonstrate our ability to internally fund capital expenditures and service debt. The non-GAAP measures are useful in comparisons of oil and gas exploration and production companies as they exclude non-operating fluctuations in assets and liabilities. Fourth Quarter Year Ended December 31, December 31, 2012 2011 2012 2011 Net loss $ (6,454) $ (44,645) $ (126,226) $ (130,995) Impairment of U.S. oil and gas properties (net of tax) [(1)] 5,956 36,913 53,072 65,706 Unrealized (gain) loss on derivatives (net of tax) [(2)] (7,383) 1,976 (7,326) (10,269) Loss on early extinguishment of debt (net of tax) [(3)] - - 17,762 402 Deferred tax expense due to U.K. tax law change 194 - 8,587 25,484 Net Loss as Adjusted $ (7,687) $ (5,756) $ (54,131) $ (49,672) Net loss $ (6,454) $ (44,645) $ (126,226) $ (130,995) Unrealized (gain) loss on derivatives (7,319) 2,719 (5,141) (8,378) Net interest expense 21,083 12,547 83,872 44,781 Letter of credit fees 9,461 - 21,903 - Loss on early extinguishment of debt - - 21,661 402 Depreciation, depletion and amortization 24,272 7,780 66,564 26,478 Impairment of U.S. oil and gas properties 5,956 36,913 53,072 65,706 Income tax expense (benefit) 17,652 (4,758) 14,228 27,061 Adjusted EBITDA $ 64,651 $ 10,556 $ 129,933 $ 25,055

[(1)] Since the impairments related to U.S. oil and gas properties, we

recognized no tax benefits as there was no assurance that we could

generate any U.S. taxable earnings.

[(2)] Net of tax benefit (expense) of $64 and $743 and $2,185 and $1,891,

respectively.

[(3)] Net of tax benefit of $3,899 for the year ended December 31, 2012.

SOURCE Endeavour International Corporation

CONTACT: Endeavour - Investor Relations, Darcey Matthews, +1-713-307-8711, or Pelham, Public Relations - UK Media, Philip Dennis, +44 (0)207 861 3919, or Henry Lerwill, +44(0)207 861 3169