...re of the rebel sharp-shooters. Lieutenant Graham, acting aid to Col. Heckman, finally succeeded in destroying the bridge. As the head of the Federal column commenced their return to Whitehall, Gen. Pettigrew 's brigade, with artillery attached, arrived unknown to the Federals, slightly to the left of the column. Gen. Pettigrew observing Morrison's battery in what seemed to be an exposed situation, deter...