On December 13, the Battle of Fredericksburg took place between Confederate forces under General Lee and Union forces under General Ambrose Burnside. Burnside had supplanted General McClellan. The town itself was used as a battlefield and many of the individual houses were completely destroyed. The city had been evacuated when it was first bombarded by Burnside on December 11. He proceeded to use five pontoon bridges to get his troops across the Rappahannock River. Although this battle resulted in some of the heaviest losses of the war, Burnside with his remaining forces was finally driven back across the Rappahannock River with the Union casualties twice as many as the Confederates. On March 8, 1863, an unusual incident occurred. At midnight, a group of Confederate raiders, led by Colonel John S. Mosby, made a raid on the Fairfax Court House which had become federally occupied. Noted for its ruthless guerilla actions, this group of raiders then made a daring invasion of the Union lines and continued to the headquarters of Union Brigadier-General Edwin H. Stoughton. After cleverly getting past Stoughton's guards in the middle of the night, Mosby himself quickly captured Stoughton as a choice Confederate prisoner. On April 30, 1863, the Union army under General Joseph E. Hooker, Burnside's successor, crossed the Rappahannock River again, this time at Chancellorsville, approximately ten miles north of Fredericksburg. "Stonewall" Jackson was in charge of the attack on Hooker at Chancellorsville and his troops were forcing back the troops under Hooker when fate seemed to take a hand. On May 2, "Stonewall" Jackson had ridden beyond his own line of battle and was returning at dusk when he was mistaken for one of the enemy and was fired upon by a group of his own soldiers. He was wounded in the left shoulder, forearm and right hand and had to have his left arm amputated the next day. He was mortally wounded and died on May 10. His death was a great shock to the Confederate forces. General A. P. Hill had also been wounded at Chancellorsville. "J.E.B." Stuart voluntarily took command of the corps originally under Jackson and by his own audacious actions successfully led them in pursuit of the Union forces under Hooker, as Jackson had originally planned. Attacked by troops from the west under Stuart and by forces from the east under Lee, Hooker and his army were finally driven back across the Rappahannock River.