Pearl Harbor bombing. USS Downes and Cassin. The jumbled mass of wreckage in the foreground of drydock number one are the U.S. destroyers, Downes (left) and Cassin (right). The battleship in the rear is the USS Pennsylvania, 33,100 ton flagship of the Pacific Fleet, which suffered relatively light damage during the Japanese attack. The Pennsylvania was repaired shortly after the attack. Main and auxiliary machinery fittings of the Downes and Cassin are being transferred to new hulls