The Maryland campaign of September 1862 ranks among the most important military operations of the American Civil War. Crucial political, diplomatic, and military issues were at stake as Robert E. Lee and George B. McClellan maneuvered and fought in the western part of the state. The climactic clash came on September 17 at the battle of Antietam, where more than 23,000 men fell in the single bloodiest day of the war.
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