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.

Early on the morning of May 2d the cannonading began its death-song and the infantry was brought into action. Before long Jackson began, with a portion of the army, to move off the field, and Hooker, observing this, believed that Lee's army was in full retreat on Richmond. This movement proved to be the undoing of Hooker's army, as Jackson was making for his right flank. It was about five o'clock in the afternoon when Jackson broke from the woods in a charge upon the unsuspecting troops of Hooker's right which was under Howard.

The approach of Jackson's forces was first intimated to the Federals by the bending of shrubbery, the stampede of rabbits and squirrels, and the flocks of birds in wild flight from the woods. First appeared a few skirmishers, then the rattling of musketry and the incessant roar of cannon. On the Confederates came in their impetuous charge. The charge was so unexpected and terrific that they carried everything before them. The Federal lines were swept as by tidal waves and rolled up like a scroll.

This crowning and final stroke of Jackson's military genius was the result of his own carefully worked-out plan, which had been approved by Lee.

General Hooker was spending the evening at his headquarters at the Chancellor House, rejoicing, as he thought, that Jackson was in full retreat and everything appeared to be going well. Presently the roar of battle became louder and louder on his right and an officer came up at full speed to notify him that his right was being fiercely attacked, was giving away, and would soon be in utter rout. Hooker made haste to the scene of battle and passed through brigade after brigade of his forces in retreat and confusion.

He was successful in having Berry re-form his division and charge the Confederates with fixed bayonets, which partly stopped the Confederates' advance. This gave the Federal artillery a few minutes to prepare itself for action. They finally succeeded in stopping the Confederate advance.

The mighty turmoil was silenced as darkness gathered. The two hostile forces were concealed in the darkness watching each other. Finally, at midnight, the order, "Forward!" was given in subdued tones to Sickle's corps. They stealthily advanced upon the Confederate position and at heavy loss gained the position sought for.