Because Lincoln felt that McClellan lacked the aggressiveness required to successfully defeat the Confederate army. McClellan was very meticulous and patient. He did not chase Confederate General Robert E. Lee after defeating his troops at Antietam. Lincoln got tired of McClellan's patience and decided to replace him with Ambrose Burnside.
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Antietam
Antietam
The commander of the Unions Army of the Potomac at Antietam was Major General George B. McClellan.
no one won at antietam.it was a tie or draw.
Their defeat by McClellan at Antietam.