The Battle of Iwo Jima was a major battle in which the United States Marine Corps landed on and eventually captured the island of Iwo Jima from the Japanese Imperial Army during World War II
The B-29 heavy bombers had a range capable of reaching the Japanese home islands and bombing the bombing runs began in October, 1944.
But the B29's were intercepted by Japanese fighters being launch from the island Iwo Jima and the fighters would attack the airfield the B-29's were coming from as well.
After being determined a threat by the U.S. U.S. Marines invaded Iwo Jima on February 19, 1945, after months of naval and air bombardment.
The Japanese defenders of the island were deeply entrenched in bunkers and the invasion force of approximately 70,000 marines encountered 20,000 Japanese soldiers.
Over the course of 36 days the Japanese defenders were wiped out, but early 7,000 U.S. Marines were killed and another 20,000 were wounded.
Iwo Jima was finally declared secured on March 16, 1945 and became an emergency landing for B-29's and saved over 2,200 B-29 bombers, and more importantly the lives of 24,000 U.S. airmen over the course of the war.