Hooker's army crossed the Rappahannock on April 30, 1863. This placed his army on Lee's flank. Hooker's Federal army numbered 97,382 men. This was twice the size of Lee's army at 57,352 men. But rather than retreat, Lee split his forces. He decided to attack Hooker while his army was still in the thick wilderness. Lee sent Jackson with 30,000 Confederate soldiers to attack the Union right flank. He assigned 