...ell passed through the Valley and cleared it of the Federals,--this was his first service as corps commander and was well executed. He then crossed the Potomac, was soon followed by A. P. Hill, and Longstreet brought up the rear. Ewell lead the advance into Pennsylvania--Longstreet followed in rear. The latter had passed through Chambersburg with two of his divisions, and these, together with A. P. Hi...