What was McClellan's army called?

McClellan's army was known as the Army of the Potomac. It was the primary Union army in the Eastern Theater of the American Civil War and played a significant role in several key battles. Commanded by General George B. McClellan, the army was involved in major campaigns such as the Peninsular Campaign and the Battle of Antietam. Despite its size and resources, the army often faced criticism for its cautious leadership.