Hooker had already been joined by two of Sedgwick's army corps, and had now six army corps at Chancellorsville, while Jackson's force consisted of 22,000 men.

Lee remained with 13,000 at Tabernacle.

The latter general had not been attacked, but had continued to make demonstrations against the Federal left, occupying their attention and preventing them from discovering how large a portion of his force had left him.
It was at five o'clock in the evening that Jackson's troops, having gained their position, advanced to the attack.

In front of them lay Howard's division of the Federals, intrenched in strong earthworks covered by felled trees; but the enemy were altogether unsuspicious of danger, and it was not until with tumultuous cheers the Confederates dashed through the trees and attacked the intrenchment that they had any suspicion of their presence.

They ran to their arms, but it was too late.