In February of 1945, US Marines attacked the rocky Japanese island of Iwo Jima, whose name literally means 'Sulfur Island'. American military strategists planned the invasion as the first assault on one of Japan’s “Home Islands” in World War II, and its success would deny the Empire the use of the island for early warning purposes and as an emergency landing strip for its damaged aircraft, while providing the United States with the same advantages. On February 9, US Navy battleships and B-24 heavy bombers from the 7th Air Force began an intense bombardment of the Japanese troops garrisoned in the island's fortified bunkers which lasted for ten days.