He might go to sleep, but the whole division would march early in the morning.

Harry wrapped himself again in his cloak, found a place soft with moss under a tree, and slept with the soft May wind playing over his face and lulling him to deeper slumber.
He rode the next morning with General Ewell and the whole division to join Jackson's army.

It was a trim body of men, well clad, fresh and strong, and they marched swiftly along the turnpike, on both sides of which Jackson was encamped further on.
Harry felt a personal pride in being with Ewell when the junction was to be made.

He felt that, in a sense, he was leading in this great reinforcement himself, and he looked back with intense satisfaction at the powerful column marching so swiftly along the turnpike.
They came late in the day to Jackson's pickets, and then they saw his army, scattered through the fields on either side of the road.
Harry rejoiced once more in the grand appearance of the new division.
Every coat or tunic sat straight.

Every shoe-lace was tied, and they marched with the beautiful, even step of soldiers on parade.