general in the regular army for his actions at Bristoe Station. During the Mine Run Campaign, Warren's corps was ordered to attack Lee's army, but he perceived that a trap had been laid and refused the order from army commander Maj. Gen. George G. Meade. Although initially angry at Warren, Meade acknowledged that he had been right. Upon Hancock's return from medical leave, and the spring 1864 reorganization of the Army of the Potomac, Warren assumed command of the V Corps and led it through the Overland Campaign, the Siege of Petersburg, and the Appomattox Campaign. During these Virginia campaigns, Warren established a reputation of bringing his engineering traits of deliberation and caution to the role of infantry corps commander. He won the Battle of Globe Tavern, August 18 to August 20, 1864, cutting the Weldon Railroad, a vital supply route north to Petersburg. He also won a limited success in the Battle of Peebles' Farm in September 1864, carrying a part of the Confederate lines protecting supplies moving to Petersburg on the Boydton Plank Road. The aggressive Maj. Gen. Philip Sheridan, a key subordinate of Lt. Gen. Ulysses S. Grant, was dissatisfied with Warren's performance. He was angry at Warren's corps for supposedly obstructing roads after the Battle of the Wilderness and its cautious actions during the Siege of Petersburg. At the beginning of the Appomattox Campaign, Sheridan requested that the VI Corps be assigned to his pursuit of Lee's army, but Grant insisted that the V Corps was better positioned. He gave Sheridan written permission to relieve Warren if he felt it was justified "for the good of the service". Grant later wrote in his Personal Memoirs, At the Battle of Five Forks on April 1, 1865, Sheridan judged that the V Corps had moved too slowly into the attack, and criticised Warren fiercely for not being at the front of his columns. Warren had been held up, searching for Samuel W. Crawford’s division, which had gone astray in the woods. But overall, he had handled his corps efficiently, and their attack had carried the day at Five Forks, arguably the pivotal battle of the final days. Nevertheless, Sheridan relieved Warren of command on the spot. He was assigned to the defenses of Petersburg and then briefly to command of the Department of Mississippi. Post-war Humiliated by Sheridan, Warren resigned his commission as major general of volunteers in