1945 Battleground was the site of the Battle of Okinawa, which was fought between the United States and Japan during World War II. The battle lasted from April 1 to June 22, 1945, and was one of the bloodiest battles in the Pacific theater of the war. The Japanese code name for the battle was 'Operation Ten-Go, ' and the American code name was 'Operation Iceberg.' The battle resulted in a decisive victory for the United States, and the Japanese forces were forced to surrender. The seven-letter answer to the crossword puzzle is 'Okinawa, ' which is the name of the island where the battle took place.