The Union general at the Battle of Antietam was George McClellan. He commanded the Army of the Potomac during this pivotal engagement on September 17, 1862.

McClellan was known for his cautious approach, which was evident in his planning and execution at Antietam. Despite having superior numbers, his hesitance limited the potential for a decisive victory. However, his forces engaged in fierce combat against Robert E. Lee’s Confederate army, resulting in significant casualties. The battle ended tactically inconclusive but provided a strategic advantage for the Union, as it halted Lee’s invasion of the North.