In hind sight, it's fairly easy to criticize the Japanese attack on Pearl Harbor. It was indeed a brilliantly planned operation, but in the end what advantage did they really gain? They sank a number of soon to be obsolete battleships, most of which were later salvaged from the bottom of the shallow harbor. More importantly, they forced the Americans to revise their equally obsolete naval strategy of using the battleship as their mainstay and replacing it with the aircraft carrier. A move which in the end would cost Japan the war.