Robert E. Lee’s Confederates make a final stand against George B. McClellan’s Federal army before Lee decides to withdraw from Maryland and return to Virginia.

Exploring the most important 55 months in American history
Robert E. Lee’s Confederates make a final stand against George B. McClellan’s Federal army before Lee decides to withdraw from Maryland and return to Virginia.
The bloodiest day in American history takes place as the armies of Robert E. Lee and George B. McClellan fight to a standoff near Sharpsburg, Maryland, along Antietam Creek.
Robert E. Lee hastily concentrates his Confederate army at Sharpsburg, Maryland, as George B. McClellan’s Federals stand ready to attack.
Robert E. Lee concentrates his Confederate Army of Northern Virginia near Sharpsburg as George B. McClellan’s Federal Army of the Potomac approaches.
A portion of Robert E. Lee’s Confederate army defends key mountain passes in Maryland against George B. McClellan’s Federals.
Robert E. Lee’s Confederates are divided into multiple sections as Federals entering Frederick, Maryland, discover a document that threatens to destroy them.