The Maryland campaign of September 1862 ranks among the most important military operations of the American Civil War, as Robert E. Lee and George B. McClellan manoeuvred 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. Thisbook explores questions regarding military leadership, strategy, and tactics; the impact of the fighting on officers and soldiers; and the ways in which participants and people behind the lines interpreted and remembered the campaign.