Established: September 17th, 1862

Named For: Robert E. Lee

Antietam National Battlefield is a National Park Service-protected area along Antietam Creek in Sharpsburg, Washington County, northwestern Maryland. It commemorates the American Civil War Battle of Antietamthat occurred on September 17, 1862.

The area, situated on fields among the Appalachian foothills near the Potomac River, features the battlefield site and visitor center, a national military cemetery, stone arch Burnside's Bridge, and a field hospital museum.

In the Battle of Antietam, General Robert E. Lee's first invasion of the North ended on this battlefield in 1862. Established as Antietam National Battlefield Site August 30, 1890, the park was transferred from the War Department on August 10, 1933,[6] and redesignated November 10, 1978. Along with all historic areas administered by the National Park Service, the battlefield was listed on the National Register of Historic Places on October 15, 1966. Additional documentation on the site was recorded by the National Park Service on February 27, 2009.

The battle was over with the Union sitting on three sides, waiting for the next day. During the night of the 18th, General Lee pulled his troops back across the Potomac River, leaving the battle and the town to General McClellan. It was the bloodiest day in United States history, with a combined tally of 22,717 dead, wounded, or missing.