Meanwhile, the new Army of the Ohio' XXIII Corps repelled Morgan's Ohio raid, although the entire army rarely functioned as one complete unit during this campaign. Reunited with the IX Corps and the addition of a cavalry division, Burnside moved to Knoxville, Tennessee. There he defeated the Confederates at the Battle of Fort Sanders in the Knoxville Campaign. After the battle, he asked to be relieved of command due to illness. Maj. Gen. John G. Foster replaced Burnside as commander of the Army and Department of the Ohio on December 9.