When did the Battle of Antietam start and end?

The Battle of Antietam was fought on Sept. 17, 1862. It is known for being the bloodiest one-day battle in the history of the United States, with a total of 22,717 casualties and losses.

The Battle of Antietam is also known as the Battle of Sharpsburg. It was fought near Sharpsburg, Md., as well as Antietam Creek. As part of the Maryland Campaign, the Army of the Potomac, led by Union Army Maj. Gen. George B. McClellan, mounted a series of assaults on the Confederates, who were led by Gen. Robert E. Lee. The battle is believed to have motivated President Abraham Lincoln to announce his Emancipation Proclamation.