...low me, and to cross the Potomac at Shepherdstown, while I crossed at Williamsport, ten miles above. In reply to these instructions, General Stuart informed me that he had discretionary powers from General Lee ; whereupon I withdrew. General Stuart held the gap for a while, and then hurried around beyond Hooker's army, and we saw nothing more of him until the evening of the 2d of July, when he came down f...