The war was the great success of George McClellan of Ohio during the American Civil War. The Battle of Antietam showed the Union that it could win the war.
What did the Battle of Antietam show the Union?
The Battle of Antietam was a victory for the Union. The Union lost about 12,400 men to 10,700 Confederate men, but the Union expelled the Confederates from the field and ended the Confederate invasion.
Antietam, the deadliest one-day war in American military history, has shown that the Union can stand up to the Confederate forces in the Eastern theater.
It also gave President Abraham Lincoln the confidence to issue a Declaration of Deliverance in a Moment of Power instead of despair.
Thus, The Battle of Antietam showed the Union that it could win the war.
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