...rtillery, to Shepherdstown on the next day, Gordon's and Hays's brigades, and the three remaining regiments of Smith's brigade, having preceded me to that place. On the 22d I crossed the Potomac at Shepherdstown and moved through Sharpsburg and Boonsboroa, encamping on the road towards Hagerstown, about three miles from Boonsboroa. The Seventeenth Virginia cavalry, under Colonel Wm. H. French, of Jenkins's ...