He constructed an elaborate system of bunkers connected by tunnels. He forbade the charges that had characterized the fighting on other islands, and ordered each men to kill ten of the enemy before he himself was killed. The tunnels were very hot due to the active volcano and medicine and food was in short supply.
After days of naval bombardment, the Marines went ashore on February 19, 1945. Some seven waves were ashore when the Japanese opened up everywhere. Foxholes could not be dug in the black sand; vehicles could not move. Casualties began to mount.
Mount Suribachi was to be taken the first day, but it was not until February 23 that the flag was raised in perhaps the most famous photo of the war. The mountain was not secure, and fighting continued.
The battle turned into an artillery duel. Hundreds of guns on both side slugged away at each other. The Marines did not break through the Japanese lines until March 9. Iwo Jima was declared secure until March 21. The next landings on Okinawa were just nine days away.
6800 Americans and almost all of Iwo Jima's 21,000 defenders were killed. Ragtag units continued fighting in the caves until the end of the war. More Marines died on Iwo Jima than any other battle in the Pacific War.