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Confederate soldiers cross into Maryland
40,000 soldiers go into Maryland to lead by General Robert E. Lee in order to convince Maryland to join the Confederates -
Union soldiers found a copy of Lee's plan
On the plan it shows Lee divides his army to attack Harpers Ferry.
But the Union didn't attack and instead reunited -
Battle of Antietam
The Union met the Confederates along Antietam Creek in Maryland
which starts the Battle of Antietam or Battle of Sharpsburg -
Aftermath
Union had suffered more than 12,000 casualties and the Confederates suffered more than 13,000 casualties making this war one of the bloodiest battles in U.S history -
Lincoln issues the Emancipation Proclamation
Lincoln creates the emancipation proclamation after the battle of Antietam because he wanted to cripple the South even more