The Battle of Antietam had a significant impact on Lincoln's view of McClellan he lost confidence in him.

Although McClellan achieved a strategic victory, his cautious approach and failure to aggressively pursue Lee's retreating forces frustrated Lincoln. The President had hoped for a more decisive action that could have dealt a serious blow to the Confederacy. McClellan's reluctance to capitalize on the advantages presented during and after the battle contributed to Lincoln's growing concerns about his leadership capabilities, ultimately leading to changes in command in the following months.