Overview: Okinawa--the last stepping stone on the way to mainland Japan. The Allied High Command deems the island's capture absolutely vital, but the already difficult fight is complicated when the region is hit by torrential rain and the battlefield becomes a quagmire. Meanwhile, U.S. bombers continue to pound mainland Japan and submarines have isolated the country from the outside world. And in the Philippines, Japanese troops try desperately trying to hold the Wawa Dam on the Marikina River.