The Mud March campaign launched by General Ambrose Burnside in January 1863 as a winter offensive to revive the Army of the Potomac ended in disaster. Burnside planned feints and a cavalry raid to surprise the Confederates, but two of his staff officers betrayed the plans to political leaders in Washington. When heavy rains fell, turning the ground to mud, Burnside's army became stuck and had to retreat without engaging the enemy. The failed campaign destroyed the troops' confidence in Burnside, prompting his resignation as commander of the Army of the Potomac.