...est, and take position on the right of our column as it advanced. By the twenty-fourth, the progress of Ewell rendered it necessary that the rest of the army should be in supporting distance, and Longstreet and Hill marched to the Potomac. The former crossed at Williamsport, and the latter at Shepherdstown. The columns reunited at Hagerstown, and advanced thence into Pennsylvania, encamping near Cha...