Okinawa The Last Battle of WWII Documentary ( Video ) September 28, 2017 Nicola World War Two World War 2 Documentary Last and biggest of the Pacific island battles of World War II, the Okinawa campaign (April 1—June 22, 1945) involved the 287,000 troops of the U.S. Tenth Army against 130,000 soldiers of the Japanese Thirty-second Army