Despite this bravado, and despite receiving units from McClellan's Army of the Potomac that swelled the Army of Virginia to 70,000 men, Pope's aggressiveness exceeded his strategic capabilities, particularly since he was now facing Confederate General Robert E. Lee. Lee, sensing that Pope was indecisive, split his smaller (55,000-man) army, sending Maj. Gen. Thomas J. "Stonewall" Jackson with 24,000 men as a diversion to Cedar Mountain, where Jackson defeated Pope's subordinate, Nathaniel Banks.