Watch Movies2Watch. In May 1945, Japan's defeat was imminent after the attacks on Saipan, Iwo Jima, and the Philippines, and Tokyo was reduced to a sea of ​​fire by another massive air raid. However, within the Ministry of the Army, there were still officers who were enthusiastic about a decisive battle on the mainland. Eventually, the Okinawa garrison was annihilated, and the US military was approaching the mainland, but on July 27th, the Potsdam Conference between the US, Britain, and the Soviet Union broadcast the Triple Joint Declaration, which set out the final terms of surrender for Japan.