Antietam National Battlefield

23,000 soldiers were killed, wounded or missing after twelve hours of savage combat on September 17, 1862. The Battle of Antietam ended the Confederate Army of Northern Virginia’s first invasion into the North and led to Abraham Lincoln’s issuance of the preliminary Emancipation Proclamation.

Dawn approached slowly through the fog on September 17, 1862. As soldiers tried to wipe away the dampness, cannons began to roar and sheets of flame burst forth from hundreds of rifles, opening a twelve hour tempest that swept across the rolling farm fields in western Maryland. A clash between North and South that changed the course of the Civil War, helped free over four million Americans, devastated Sharpsburg, and still ranks as the bloodiest one-day battle in American history.

The Battle of Antietam was the culmination of the Maryland Campaign of 1862, the first invasion of the North by Confederate General Robert E. Lee and the Army of Northern Virginia. In Kentucky and Missouri, Southern armies were also advancing as the tide of war flowed north. After Lee’s dramatic victory at the Second Battle of Manassas during the last two days of August, he wrote to Confederate President Jefferson Davis that “we cannot afford to be idle.” Lee wanted to keep the offensive and secure Southern independence through victory in the North; influence the fall mid-term elections; obtain much needed supplies; move the war out of Virginia, possibly into Pennsylvania; and to liberate Maryland, a Union state, but a slave-holding border state divided in its sympathies.

Lee’s army withdrew back across the Potomac to Virginia, ending Lee’s first invasion into the North. Lee’s retreat to Virginia provided President Lincoln the opportunity he had been waiting for to issue the preliminary Emancipation Proclamation. Now the war had a dual purpose of preserving the Union and ending slavery.