BATTLE OF CHANCELLORSVILLE (May 2, 3).--Burnside, after the defeat at Fredericksburg, was succeeded by General Hooker (January 26). The departure of Longstreet from his force, leaving Lee only sixty thousand to oppose to the Potomac army of over one hundred thousand, offered a favorable opportunity for an attack. Accordingly, Sedgwick was left to carry the intrenchments at Fredericksburg, while the main body crossed the Rappahannock some miles above, and took position in the wilderness near Chancellorsville (map 4, opp. p. 223). Lee, relying on the dense woods to conceal his movements, risked the perilous chance of dividing his army in the presence of a superior enemy. While he kept up a show of fight in front, Jackson, by a detour of fifteen miles, got to the rear with twenty thousand men, and, suddenly bursting out of the dense woods, routed the Union right. That night, Hooker took a new position; but by constant attacks through the next day, Lee gradually forced the Union line from the field of battle, and captured Chancellor House. [Footnote: A pillar on the veranda of this house, against which Hooker was leaning, being struck by a cannon-ball, that general was stunned, and for an hour, in the heat of the fight, the Union army was deprived of its commander.] As he was preparing for a final grand charge, word was received that Sedgwick had crossed the Rappahannock, taken Fredericksburg, and had fallen on his rear. Drawing back, he turned against this new antagonist, and by severe fighting that night and the following day, compelled him to recross the river. Lee then went to seek Hooker, but he was already gone. The Army of the Potomac was soon back on its old camping ground opposite Fredericksburg. [Footnote: In this battle the South was called to mourn the death of Stonewall Jackson, whose magical name was worth to their cause more than an army. In the evening after his successful onslaught upon the flank of the Union line, while riding back to camp from a reconnoissance at the front, he was fired upon by his own men, who mistook his escort for federal cavalry.] LEE'S SECOND INVASION OF THE NORTH.--Lee; encouraged by his success, now determined to carry the war into the Northern States, and dictate terms of peace in Philadelphia or New York.