Which general was relieved of his command in 1862 for not pursuing Robert E Lee?

General George B. McClellan was relieved of his command in 1862 for not aggressively pursuing Confederate General Robert E. Lee after the Battle of Antietam. Despite having the opportunity to engage Lee's forces, McClellan's caution and reluctance to advance led to criticism from President Abraham Lincoln and other military leaders. This decision ultimately contributed to his removal from command of the Army of the Potomac.