The Battle of Iwo Jima is remembered as one of the bloodiest engagements of the Pacific War. But the story of how the island was taken involves a weapon so terrifying that it changed the men who used it forever. The flamethrower was the only tool that could root out a hidden enemy, but the cost of wielding it was almost too high to bear.
The island itself was a nightmare before a single shot was fired. Iwo Jima was barely eight square miles of black volcanic rock, steaming with sulfur and blasted by wind. There were no trees, no rivers, and no natural shelter. But its location was priceless. It sat exactly halfway between the Mariana Islands and the Japanese mainland, directly under the flight path of B-29 Superfortress bombers.
America needed the island as an emergency landing site and a launch point for fighter escorts. The Japanese knew this months in advance. Under orders from General Tadamichi Kuribayashi, they did not simply dig trenches. They carved over 11 miles of tunnels through the island’s core. Command bunkers, mortar nests, and machine gun pillboxes were buried into the mountainside, reinforced with steel and concrete.
Kuribayashi knew the Americans would eventually win. His goal was to make them pay so heavily for every inch that the US might think twice about invading Japan itself. There would be no banzai charges. Just silence, traps, and death from below.
On the morning of February 19th, 1945, the US unleashed one of the heaviest pre-invasion bombardments of the war. Naval guns and bombers pounded the island for days. But they were bombing ghosts. Most of the Japanese soldiers were deep underground, untouched and waiting.
The landing was a disaster from the start. The beach was covered in fine volcanic ash that swallowed boots and jammed tank treads. There was no cover. For over an hour, there was silence. Then the Japanese opened fire with everything they had. Pre-sighted artillery exploded in the surf. Machine guns raked the sand. The beach became a killing field.
The deeper the Marines pushed inland, the stranger and deadlier the fight became. There were no front lines. The Japanese had built a fortress inside the island itself. The pillboxes were masterpieces of death, reinforced to survive direct hits from tanks. Their gunports were angled to overlap, meaning each one could cover the next. And almost all of them were connected by tunnels.
You could destroy a bunker and move on, only for the Japanese to sneak back in later and ambush you from behind. Grenades and satchel charges only worked if someone could get close enough. But getting close meant crawling over open ground under machine gun fire. Even if you reached the pillbox, the zigzag interior often absorbed the blast.
Then someone brought up an old, nearly forgotten weapon. The flamethrower. Fire didn’t care about zigzag walls. It flooded every space, robbed men of air, and made hiding impossible. The Marines began strapping fire to their backs and sending men into hell.
The M2 flamethrower was a beast of a weapon. Fully loaded, it weighed around 70 pounds. The tanks were filled with a thickened mix of gasoline and diesel, a jelly that stuck to anything it touched and kept burning. The nozzle could unleash a roaring stream of flame up to 30 yards away for just 10 seconds total.
Every operator knew they had one chance before the weapon ran dry. And if the Japanese saw you, they would try to kill you first. Flamethrower operators were the most feared and hated men on the island. Japanese commanders issued direct orders to eliminate them at any cost.
One Marine recalled watching a fellow operator charge a cave, aim his weapon, and have it misfire. Before he could retreat, two Japanese soldiers grabbed him and pulled him into the darkness. For two days, Marines nearby heard his screams. Then they stopped. That is why flamethrower men often begged their squadmates to shoot them if they were ever captured.
The weapon created an inferno that reached over 1,000 degrees Fahrenheit. Inside caves and pillboxes, it consumed all oxygen in seconds. Some post-war studies claimed victims likely lost consciousness before feeling pain. But to the men who used it, it never felt clean. One operator described clearing a pillbox and then vomiting at what he saw inside. He sat outside in silence for an hour before his commanding officer ordered him back into action.
The psychological toll was immense. Operators often refused to use the weapon again. Some threw up before missions. Others confessed decades later that they never told their families what they had done. The casualty rate for flamethrower operators soared past 90 percent. Commanders needed a new solution.
The answer was more metal. The M4A3R3 Sherman, known as the Flame Sherman, replaced its main gun with a flamethrower. It had a range of nearly 100 yards and carried 300 gallons of fuel. It had armor. It could get close to bunkers without being shredded by machine gun fire.
But the terrain was still soft volcanic ash that bogged down treads. Every flame Sherman became a priority target the second it opened fire. Suicide charges, hidden mines, and explosive traps were all aimed at them. But they went forward anyway. Their psychological impact was devastating. Entire enemy positions surrendered at the sight of them.
On February 23rd, 1945, the same day the iconic flag was raised over Mount Suribachi, a different battle was raging below. That is where Hershel “Woody” Williams, a quiet Marine from West Virginia, was handed what many called a suicide mission. He was to destroy a series of pillboxes that had pinned down his entire company.
Woody said yes. With four fellow Marines assigned to cover him, two of whom would die within minutes, he began crawling across the volcanic ash. He snuck up on the first pillbox, found a narrow slit near the air vent, and shoved the nozzle in. Then he pulled the trigger. A blast of fire tore through the bunker, followed by screams and then silence.
He didn’t pause. Woody turned and moved toward the next, then the next. In between assaults, he sprinted back to the rear line to grab another fully loaded flamethrower. By the end of his run, he had cleared seven enemy positions single-handedly. One Japanese soldier charged him with a bayonet. Woody turned, fired a jet of flame, and stopped the attack in its tracks.
Woody Williams was awarded the Medal of Honor, becoming the only flamethrower operator in World War II to receive that distinction. He lived until 2022, passing away at the age of 98. But even in his final years, the memories of Iwo Jima lingered. In interviews, he admitted he couldn’t remember much of the actual battle, likely a defense mechanism.
What he did remember were the faces of the Marines who didn’t come back. “I’ve never considered myself a hero,” Woody often said. “The heroes are the ones who never came home.” He never glorified the flamethrower. He respected its necessity. But he mourned its reality.
Flamethrower operators from the Pacific War rarely spoke of their role. Many refused to tell their families what they did. Veterans groups reported disproportionately high rates of alcoholism, depression, and even suicide among former flame troops. Psychiatrists who studied combat trauma noted that those who used flamethrowers experienced moral injury more deeply than others.
The military retired the flamethrower in the 1970s. Officially, it was outdated. Unofficially, it was too brutal to justify anymore. In 1980, the United Nations Convention on Certain Conventional Weapons listed incendiary weapons as subject to restriction. Modern militaries began distancing themselves from their use.
Out of 335 flamethrower operators deployed at Iwo Jima, only 18 came back alive. That is a 92 percent casualty rate. Most died before they could fire. Those who returned were never the same. But they did what they had to because in that volcanic hellscape, there was no other way forward.
Iwo Jima was captured. The flag went up. The war in the Pacific moved closer to Japan. But for those who carried fire on their backs, the victory came at a cost that history rarely talks about. Some weapons leave wounds that never heal, and some men carry burdens that no metal can ever lift.