HMS Royal Oak was a Revenge class battleship,also reffered to as "R"Class. The ships of the R Class were deployed to the Pacific theater during WWII. Except for HMS Royal Oak which was sunk 6 days after the begining of the war,at Scapa Flow the Royal Navy's base in Scotland. It was sunk by a German U Boat commanded by Lt. Guenther Prien,who was able to evade the submarine nets deployed in front of the base and within the harbor.