...ot have been ordered to march on Longstreet's flank, because (1) Ewell was then in Pennsylvania and Longstreet in Virginia, and (2) Longstreet and Hill had received no orders to march. The next day General Lee wrote to Mr. Davis: Reports of movements of the enemy east of the Blue Ridge cause me to believe that he is preparing to cross the Potomac. A pontoon bridge is said to be laid at Harper's Ferry; hi...