It showed that the Union could stand against the Confederate army in the Eastern theater. The battle of Antietam is the deadliest one-day battle in American military history.
Battle of Antietam
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The Battle of Antietam, also called the Battle of Sharpsburg, particularly in the Southern United States, took place during the American Civil War on September 17, 1862, between Confederate General ... Wikipedia
Date: September 17, 1862
Nickname: the Battle of Sharpsburg
Included in event: American Civil War
Location: Maryland, Sharpsburg, and Washington County