The scene witnessed was dreadful and heart-rending. The Union loss was about 12,000, and the Confederates less than half that number. The Union army was withdrawn across the river under the cover of darkness, and the battle of Fredericksburg had passed into history. Burnside, at his own request, was relieved of the command of the Army of the Potomac, which was handed to General Joseph Hooker. THE BATTLE OF CHANCELLORSVILLE After the battle of Fredericksburg the Union army went into winter quarters at Falmouth, only a few miles away, while the Confederates took up their encampment for the winter at Fredericksburg. General Joseph Hooker, who was popularly known as "Fighting Joe Hooker," had succeeded General Burnside in command of the Army of the Potomac, which numbered about 130,000 men, while that of the Confederates numbered about 60,000. Hooker conceived the idea to divide his army and leave Sedgwick with about 40,000 men to make a feint upon the Confederates, stationed about Fredericksburg, and himself with the remainder of the army to move around Lee's army and take a position at Chancellorsville, a small place in a wilderness country only a few miles from Fredericksburg, and by doing this, take Lee by surprise. These plans of Hooker have been considered by war historians as being well laid if they had been carried out. Lee was on the alert, and had heard of Hooker's plans, and was not to be caught in the trap. Lee, paying little attention to Sedgwick, east of Fredericksburg, had turned to face Hooker. By rapid night marches he met Hooker's army before it reached its destination. His advance columns were pushed back by the Federals, who succeeded in taking the position which was assigned to them, Meade on the left and Slocum on the right, with adequate support in the rear. All was in readiness and had favorable positions when, to the amazement of all the officers, Hooker ordered the whole army to fall back to the position it had occupied the day before, thereby leaving the advantage with Lee, who moved his forces up to the positions which the Federals evacuated and began feeling the Federal lines with some cannonading during the evening of May 1st. The Confederates were in extreme danger, having one large army in their front and another almost as large as theirs in their rear near Fredericksburg. But Lee decided to make one great and decisive blow at Hooker in front. During the night of May 1st Lee held council with "Stonewall" Jackson and accepted a plan laid out by him for Jackson to take part of the army and move around through the dense wood and rough country and fall upon the right flank of the enemy.