The document summarizes the history of Okinawa Island and the Battle of Okinawa that took place from April to June 1945. Okinawa was originally a prosperous trading island but was later invaded by Japanese samurai in 1609. In 1945, the United States led an invasion of Okinawa with support from other Allied countries against Japan. The battle resulted in over 150,000 casualties, including 66,000 Japanese soldiers killed and over 100,000 Okinawan civilian deaths. The heavy losses influenced the U.S. decision to use atomic bombs on Hiroshima and Nagasaki, leading to Japan's surrender.