For the important position of chief of staff, Hooker asked the War Department to send him Brig. Gen. Charles Stone, however this was denied. Stone had been relieved, arrested, and imprisoned for his role in the Battle of Ball's Bluff in the fall of 1861, despite the lack of any trial. Stone did not receive a command upon his release, mostly due to political pressures, which left him militarily exiled and disgraced. Army of the Potomac historian and author Bruce Catton termed this request by Hooker "a strange and seemingly uncharacteristic thing" and "one of the most interesting things he ever did." Hooker never explained why he asked for Stone, but Catton believed: