Also during this winter Hooker made several high-level command changes, including with his corps commanders. Both "Left Grand Division" commander Maj. Gen. William B. Franklin, who vowed that he would not serve under Hooker, and II Corps commander Maj. Gen. Edwin Vose Sumner were relieved of command, on Burnside's recommendation, in the same order appointing Hooker to command. The IX Corps was a potential source of embarrassment or friction within the army because it was Burnside's old corps, so it was detached as a separate organization and sent to the Virginia Peninsula under the command of Brig. Gen. William F. "Baldy" Smith, former commander of VI Corps. (Both Franklin and Smith were considered suspect by Hooker because of their previous political maneuvering against Burnside and on behalf of McClellan.)