What is the Battle of Antietam?
on September 17th, 1862, at Antietam Creek in Maryland, George McClellan's army met Robert E. Lee's army. The resulting of the Battle of Antietam cause the bloodiest day in American history. About 25,000 men died or were wounded. Lee lost nearly one-third of his fighting force and withdrew to Virginia. But McClellan did not pursue and so missed a chance to finish off Lee's army. Lincoln was so angry, he fired McClellan.