...ned the line of the Big Black River, and fallen back to Vicksburg. On this information my fourth order to Lieutenant-General Pemberton was dispatched. It was this: If Haynes's Bluff is untenable, Vicksburg is of no value and cannot be held; if, therefore, you are invested in Vicksburg you must ultimately surrender. Under such circumstances, instead of losing both troops and place, we must, if possibl...