General mcclellan was reinstated as commander of the army of the potomac due to his ability to

General McClellan began as a youthful cadet at West Point, where he in the long run graduated second in his class. He battled decently in the Mexican War and showed military designing at West Point. Strangely, he was to meet his future President and Commander in Chief, Abraham Lincoln, when he turned into the Head of Engineering at Illinois Central Railroad in 1857 after he surrendered from the administration.