With 400 sailors aboard, the Oklahoma lost her balance, rolled onto her side and slipped underwater. Next, torpedoes pierced the shell of the battleship USS Oklahoma. The ship exploded and sank with more than 1,000 men trapped inside. At 8:10, a 1,800-pound bomb smashed through the deck of the battleship USS Arizona and landed in her forward ammunition magazine. Bombs and bullets rained onto the vessels moored below. On December 7, after months of planning and practice, the Japanese launched their attack.Īt about 8 a.m., Japanese planes filled the sky over Pearl Harbor. That way, the Americans would not be able to fight back as Japan’s armed forces spread across the South Pacific. The Japanese plan was simple: Destroy the Pacific Fleet.