CHAN'CELLORSVILLE, BATTLE OF. At Chan cellorsville, Va., on May 2 and 3, 1863, the Con federates gained one of their greatest victories in the Civil War. The Union army, though superior in numbers, after three days' terrible fighting was de feated and retreated across the Rappahannock, with a loss of 18,000 men. The Confederate loss was only 13,000, but it included the brave and able Stonewall Jackson, who was accidentally shot by his own men and died eight days later. (See Civil War.)