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The battle of Antietam, on September 17, 1862 at Sharpsburg, MD, resulted from the Army of the Potomac finding a copy of Robert E. Lee's orders during Lee's intended invasion of the north. In spite of catching Lee unprepared and divided, the Union army only managed a draw. Even so, this battle was the pivotal point in the war, ending the South's best chance of independence. For a history of the Antietam campaign click here.