In the _____ on September 17, 1862, the Union's Army of the Potomac forced Lee's Army of Northern Virginia to retreat from Union territory in Maryland back into the Confederacy.

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The Battle of Antietam, fought on September 17, 1862, was the event where the Union's Army of the Potomac, under General George McClellan, forced General Robert E. Lee's Army of Northern Virginia to retreat from Maryland back into Confederate territory. This battle is particularly noted for being the single bloodiest day in American military history.