Antietam: A Turning Point in the Civil War

The Battle of Antietam, fought on September 17, 1862, near Sharpsburg, Maryland, remains the bloodiest single day in American military history, with roughly 22,700 casualties on both sides combined.

Confederate General Robert E. Lee had invaded the North, hoping to win a decisive victory on Union soil, bolster Southern morale, and encourage foreign recognition of the Confederacy. His campaign was compromised when a Union soldier found a copy of Lee's orders wrapped around cigars in an abandoned camp. The orders reached General George McClellan, who nonetheless moved cautiously, giving Lee time to consolidate his scattered forces.

The fighting unfolded in three major phases. In the morning, savage combat raged through Miller's Cornfield and around the Dunker Church. Midday brought the assault on the Sunken Road, later called "Bloody Lane," where Confederate defenders were eventually overrun. In the afternoon, Ambrose Burnside's troops struggled to cross what became known as Burnside's Bridge, held by a small Georgia force, before A.P. Hill's division arrived from Harpers Ferry and rescued Lee's right flank.

Tactically, the result was a stalemate. Lee withdrew across the Potomac the following night, and McClellan declined to pursue, a decision that contributed to Lincoln removing him from command in November.

The strategic consequences were enormous. Antietam gave Lincoln the victory he needed to issue the preliminary Emancipation Proclamation on September 22, reframing the war as a fight against slavery and effectively ending any chance of British or French intervention.Read more