...n the Rapidan, had gone into the hands of Pope. Thus McClellan was informed that Lee's army would leave Frederick and cross the mountains at Boonsboro gap; that D. H. Hill's division was to halt at Boonsboro , while the rest of Longstreet's corps marched toward Hagerstown; that Jackson would cross the Potomac and move on Harper's Ferry; that McLaws' division, following Jackson, would enter Pleasant valley...