Examines the Maryland Campaign during the American Civil War which ended with the battle at Antietam with a Union victory, and discusses how this battle was responsible for President Lincoln's decision to emancipate the slaves.

Lincoln, war, and emancipation : from Ft. Sumter to the Peninsular Campaign -- McClellan on the Peninsula -- Waiting for the moment : Lincoln and emancipation in the summer of 1862 -- Europe ponders Confederate recognition -- Lee crosses the Potomac : the Maryland campaign begins -- McClellan and Lee at Antietam, September 15 to 21 -- Lincoln emancipates and voters react -- Europe reacts to Antietam and emancipation -- From Antietam to Gettysburg : Lincoln defends emancipation.