When Maj. Gen. Ambrose Burnside was relieved of command of the Union's Army of the Potomac (following the disastrous Battle of Fredericksburg in December 1862 and the fiasco of his Mud March in January 1863), his replacement, Maj. Gen. Joseph Hooker, immediately began reorganizing and training his army, in winter quarters outside of Fredericksburg. One of his most significant actions was to combine smaller cavalry units, spread out across the army, into a single Cavalry Corps, led by Maj. Gen. George Stoneman. Up until this time, the Union cavalry had been consistently outperformed by their Confederate counterparts, commanded by Maj. Gen. J.E.B. Stuart. Although they possessed superior equipment and had the advantage of a plentiful supply of men and federal horses, the Union cavalrymen had lacked the confidence, experience, and leadership to challenge Stuart.