Battle_of_Okinawa The Battle of Okinawa, also known as Operation Iceberg, was fought on the Ryukyu Islands of Okinawa and was the largest amphibious assault in the Pacific Theater of World War II as well as the last pitched battle of the entire war. The 82 day long battle lasted from late March through June 1945.The battle has been referred to as the "Typhoon of Steel" in English, and tetsu no ame ("rain of steel") or tetsu no bōfū ("violent wind of steel") in Japanese.