Antietam, Battle of

Antietam, Battle of (Md.) On 17 September 1862, Major General George B. McClellan’s 75,316 Federals inflicted heavy casualties on General Robert E. Lee’s 51,844 Confederates, but were unable to break the Southern lines. USA losses: 2,108 killed, 9,549 wounded, 753 missing. CSA losses: 2,700 killed, 9,024 wounded, 2,000 missing. Interpreted as a Union victory because Lee retreated from Md. the next day, Antietam created the position of military strength needed for Abraham Lincoln to issue the Emancipation Proclamation.