Sedgwick and Warren were to make attacks in their front, to detain as many of the enemy as they could and to take advantage of any attempt to reinforce Hill from that quarter.

Burnside was ordered if he should succeed in breaking the enemy's centre, to swing around to the left and envelop the right of Lee's army.

Hancock was informed of all the movements ordered.
Burnside had three divisions, but one of them--a colored division--was sent to guard the wagon train, and he did not see it again until July.
Lee was evidently very anxious that there should be no battle on his right until Longstreet got up.

This is evident from the fact that notwithstanding the early hour at which I had ordered the assault, both for the purpose of being the attacking party and to strike before Longstreet got up, Lee was ahead in his assault on our right.

His purpose was evident, but he failed.
Hancock was ready to advance by the hour named, but learning in time that Longstreet was moving a part of his corps by the Catharpin Road, thus threatening his left flank, sent a division of infantry, commanded by General Barlow, with all his artillery, to cover the approaches by which Longstreet was expected.