To Antietam Creek: The Maryland Campaign of September 1862

The Battle of Antietam was the bloodiest single-day conflict in American history and the first major battle to take place on Union soil. Historian D. Scott Hartwig examines the tense build-up to this critical turning point in the Civil War, from the return of George B. McClellan as commander of the Army of the Potomac through the Confederate invasion, the siege and capture of Harpers Ferry, and the day-long Battle of South Mountain.