- 23 minutes ago
Japanese soldiers were trained to stop tanks at arm’s length, yet the American machine that terrified them most was the one with no gun at all: the bulldozer. From Guadalcanal to Tarawa, Peleliu, and Iwo Jima, this military history story follows Seabees, Marines, and Army engineers who drove into fire at walking pace and changed the Pacific War with earthmoving, roads, ramps, and sealed caves.
The narrative begins on Mono Island, where a Caterpillar D8 named Helen crushed a Japanese pillbox, then traces how bulldozers kept airstrips open on Guadalcanal, helped turn Tarawa’s beach defenses into tombs, and finally forced their way into the coral ridges and volcanic ash of Peleliu and Iwo Jima. Along the way, it shows how Japanese fortifications evolved to defeat tanks, flamethrowers, and naval gunfire, only to be undone by construction equipment, steel matting, and the relentless work of combat engineers.
If you enjoy WW2 stories, Pacific theater history, military engineering, and narrated war documentaries, this is a gripping listen about the hidden machines that shaped victory. It also fits searches for WW2 history, Seabees, combat engineers, bulldozer warfare, and forgotten World War II stories.
Created for listeners who search for WW2 stories, military history narration, Pacific War documentaries, Seabees history, combat engineer stories, and battlefield engineering. A strong choice for fans of historical storytelling, war history analysis, and forgotten World War II episodes with detailed, immersive narration.
The narrative begins on Mono Island, where a Caterpillar D8 named Helen crushed a Japanese pillbox, then traces how bulldozers kept airstrips open on Guadalcanal, helped turn Tarawa’s beach defenses into tombs, and finally forced their way into the coral ridges and volcanic ash of Peleliu and Iwo Jima. Along the way, it shows how Japanese fortifications evolved to defeat tanks, flamethrowers, and naval gunfire, only to be undone by construction equipment, steel matting, and the relentless work of combat engineers.
If you enjoy WW2 stories, Pacific theater history, military engineering, and narrated war documentaries, this is a gripping listen about the hidden machines that shaped victory. It also fits searches for WW2 history, Seabees, combat engineers, bulldozer warfare, and forgotten World War II stories.
Created for listeners who search for WW2 stories, military history narration, Pacific War documentaries, Seabees history, combat engineer stories, and battlefield engineering. A strong choice for fans of historical storytelling, war history analysis, and forgotten World War II episodes with detailed, immersive narration.
Category
📚
LearningTranscript
00:00October 27, 1943. Mono Island, in the Treasury Group, 28 miles south of Bougainville.
00:08Rain coming down hard enough to flatten the sea. New Zealand infantry are across the beach and
00:14moving inland, and then the beach stops moving, because a Japanese machine gun in a pillbox of
00:19coconut logs and coral is firing along the sand at waist height, and nothing gets past it.
00:25Men are lying at the waterline. A tank would have been the answer here. There was no tank on that
00:32beach. What came off the ramp instead had no turret, no gun, no armor plate, and no crew.
00:39It weighed 24 tons. It was a Caterpillar D8, and painted on it was the name Helen, after the wife
00:47of the man driving it. Machinist's mate 2nd class Aurelio Tassone, Company A, 87th Naval Construction
00:55Battalion. He had come ashore to cut a road, not to fight. Lieutenant Charles Turnbull ran to the
01:02machine and pointed at the pillbox. Tassone raised the blade. Ten feet of steel came up in front of
01:10his chest, and he put the tractor into gear and drove straight at the position. Turnbull walked
01:17beside the track with a carbine, firing at the embrasure to keep the gunner's heads down.
01:22Japanese rounds hit the blade and glanced off it.
01:26Now here is the detail I want you to hold onto for the next hour, because it is the whole
01:31story compressed into one image. The bulldozer was not charging. A D8 in low gear moves at
01:39walking speed. The 12 men inside that pillbox watched it come toward them for a long time.
01:45Then Tassone dropped the blade. The pillbox stopped being a pillbox. It became a low place in the sand.
01:55Those 12 men were not untrained troops who had never seen machinery. By the autumn of 1943, the Japanese
02:02army was teaching its infantry an entire discipline for killing armor at arm's length. They called it
02:09Nikuhaku, human bullet. Satchel charges shoved under the belly plate. Magnetic mines slapped onto the hull.
02:17Petrol bombs threw the vision slits. Within a year, they would issue a shaped charge on the end of a
02:23pole,
02:23the lunge mine, which a man drove into the flank of a Sherman while standing close enough to touch the
02:29paint,
02:29and which killed him, along with a tank. Think about what that doctrine asked of a soldier and what it
02:36handed him back. It asked him to die. In exchange, it gave him a tank, a procedure, and a moment
02:44in which
02:44his death was an event that someone would write down. A tank was a problem with a solution.
02:51And yet, when you go through the prisoner interrogations, the captured diaries, the after-action
02:56interviews, and the post-war Japanese accounts, from Guadalcanal all the way to Okinawa, the American
03:03machine that keeps appearing next to words like dread is not the Sherman. It is the one with no gun
03:09on it.
03:10That is what we are here to explain. Why the unarmed machine was the worst one.
03:28Let me be precise about the claim, because it would be easy to turn this into folklore, and it is
03:34not folklore.
03:36No Japanese garrison was frightened of a tractor as an object. There were tractors in the Solomons before
03:42the war. The fear that shows up in the record is specific, and it is about what that machine did
03:48to the relationship between a defender and the ground he was standing on. And by 1943, that relationship
03:56was the only asset the Japanese army had left. It was the whole strategy. Dig in. Make the Americans
04:03come to you. Make every yard cost so much that the United States decides the Pacific is not worth the
04:10bill.
04:10All of it depended on the ground holding still. The bulldozer was the machine that would not let
04:17the ground hold still. Hold that, because we are going to watch it develop across two and a half years
04:22and four islands. And it develops as a fight. The Japanese adapt. The Americans adapt back. Each round
04:30narrows what a defender is permitted to do. Until by 1945, Japan has built the most sophisticated field
04:37fortifications of the entire war. And that sophistication has quietly turned into the thing
04:42that destroys the men inside it. We will get to exactly how. But none of it begins at Mono Island.
04:49It begins 14 months earlier, on an unfinished airstrip on an island most Americans could not have located on
04:55a map. On the night of August 6, 1942, Japanese construction troops on Guadalcanal were issued an
05:02extra ration of sake. They had earned it. Two labor units, roughly two and a half thousand men,
05:08diverted from a midway operation that never happened, had brought that runway in ahead of
05:13schedule. With hand tools, carrying baskets, two small gasoline locomotives on narrow gauge rail,
05:20and one road roller. They celebrated on the evening of the 6th. By midday on the 7th,
05:27the field belonged to the 1st Marine Division. And within four months, Japanese air fleet reports
05:34about that strip contained a question their own staff could not answer. Their bombers hit it. Their
05:41battleships shelled it. 14-inch shells, hundreds of them, in a single night. Pilots came home and reported
05:49the field destroyed. And they were telling the truth. The next morning, American aircraft took off from it
05:56anyway. And the morning after that? The answer was parked at the edge of that runway, and it had no
06:02gun
06:03either. What Japan never grasped was not that the Americans could repair an airfield. It was how fast,
06:11and what that speed meant for every island they still held. Go back to that airstrip for a moment,
06:17because what happened there in the autumn of 1942 set the terms for everything that followed.
06:23When the 1st Marine Division took the field on August 7th, 1942, the Americans had almost no
06:30engineering equipment ashore. Two days later, after the disaster off Savo Island, the transports pulled
06:37out and took most of the heavy gear with them. The Marines were left holding an unfinished runway,
06:42with a hole in the middle of it. So they finished it with Japanese tools. The 1st Engineer Battalion filled
06:50the
06:50gap in that runway using captured Japanese dump trucks, hand-loaded narrow-gauge hopper cars,
06:56and a Japanese road roller to pack the fill down. Roughly 100,000 cubic feet of earth moved by men
07:04with shovels on equipment built in Japan. Then they dragged the surface flat with a steel girder on a
07:11chain. On August 12th, a Navy Catalina put down on it, and the field the Japanese had finished ahead of
07:17schedule six days earlier was open for American business. Hold onto that image, Americans building
07:23with Japanese equipment, because it does not happen again. Ever. On September 1st, five officers and 357 men
07:33of the 6th Naval Construction Battalion came ashore under Lieutenant Commander Joseph Blunden. They were not
07:40young. The Seabees recruited experienced construction men. Journeymen, foremen, heavy equipment operators
07:46in their 30s and 40s. Men who had built dams and highways through the Depression. Blunden's job was one
07:53sentence long. Keep this runway open. Now watch how a construction foreman thinks about being bombed.
08:01The Japanese raids arrived around midday, most days, from Rabool. Blunden did not treat that as an
08:07emergency. He treated it as a scheduled work interruption. Piles of crushed coral were staged
08:14at intervals along both sides of the strip before the bombers ever appeared. Trucks were loaded in
08:20advance and parked where they would not be hit. Dozers sat idling. The men went into holes when the sirens
08:27went, and the instant the last aircraft cleared, the holes emptied and the runway filled with machinery.
08:34Blunden put a number on what his men could do. And it is the number that matters most in this
08:40entire
08:40story. 100 Seabees, he said, could repair the damage of a 500-pound bomb hit on that airstrip.
08:48Crater filled, compacted, Marston matting relayed, in 40 minutes. 40 minutes. Think about what that does to
08:59the arithmetic of a bombing campaign. A Japanese bomber crew flew 600 miles from Rabaul, ran the
09:06gauntlet of Wildcats and anti-aircraft fire, put their bombs on the runway, and flew 600 miles home.
09:14Total elapsed time? Roughly seven hours. Total effect on the target? Roughly 40 minutes.
09:21On October 14th, the Seabees filled 13 craters in a single hour, while American aircraft circled overhead,
09:28waiting to land, low on fuel, with nowhere else in the Solomons to go.
09:34And then came the night that was supposed to settle it. At 1.33 in the morning on October 14th,
09:41the battleships Kongo and Haruna opened fire on the Lunga perimeter from 17,000 yards.
09:49Over 1 hour and 23 minutes, they put more than 900 14-inch shells into that field. Not bombs. Battleship
09:59Main Battery. 48 of the 90 aircraft on the island were destroyed. Almost all the aviation gasoline burned.
10:08Men who lived through it described the ground itself as behaving like water.
10:13That was the single heaviest thing the Imperial Japanese Navy ever did to a piece of American-held
10:20ground. American aircraft flew from that field later the same day. I want to be careful here,
10:27because this is the moment the pattern becomes visible. The Japanese pilots and gunners were not
10:32lying and they were not incompetent. They destroyed the airfield. The reports that went up through 11th
10:38air fleet and to the 17th army were accurate at the moment they were written. The strip was wrecked.
10:44The plan for the October ground defensive was built on exactly that assessment.
10:48The assessment kept coming apart because of men with dump trucks and caterpillars,
10:53who treated a crater the way a road crew treats a pothole. And now follow the second order effect,
10:59because this is where a construction battalion stops being a support unit and starts shaping the war.
11:05As long as that field kept launching aircraft, no Japanese transport could approach Guadalcanal in
11:11daylight. Reinforcement had to come at night, on destroyers, at speed. Destroyers can carry men.
11:19What destroyers cannot do is unload cranes, graters, rollers, and tractors onto an open beach and get
11:26clear before dawn. Japanese troops on Guadalcanal were reduced to floating supply
11:31drums ashore and eating roots. So the Japanese army fought the rest of the Solomon's campaign
11:37with the same hand tools it had started with. When they built their next airfield, at Munda on New
11:44Georgia, they did it brilliantly. And they did it by hand, clearing the ground beneath the palm canopy,
11:51leaving the crowns tied together overhead so that American photo interpreters saw unbroken jungle for
11:56weeks. It was a masterpiece of concealment, built by men with axes.
12:03That is the real verdict of Guadalcanal. And Japanese officers drew it themselves in the reports
12:09they wrote afterward. You could not outhold the Americans anywhere their machines could operate.
12:16The machines made damage temporary. And if damage is temporary, then dying to inflict it means nothing.
12:24So Japan changed the question. If the machines could not be stopped after they landed,
12:30the answer was that they must never land. Stop the Americans at the waterline. Make the beach itself
12:37the killing ground. Build with reinforced concrete and steel and coconut logs and coral, with interlocking
12:45fire across every yard of sand. And hold the reef line with everything.
12:51Fourteen months later, on a coral island 800 yards wide called Batio, the Marines walked into that answer.
12:59And it very nearly worked. There was one structure on Batio the naval bombardment could not touch.
13:06Fourteen inch shells had already failed against it. And every Marine who looked at it knew what it was.
13:12What finally shut it was not a shell, not a flamethrower, and not a tank.
13:18November 20, 1943. Batio Island. Tarawa Atoll.
13:23Two miles long, 800 yards across at its widest point, and shaped like a bird lying on its side.
13:30Less than one square mile of coral. And on that coral, Rear Admiral Keiji Shibazaki had 4,836 men,
13:3814 coastal defense guns, around 50 pieces of field artillery, and roughly 500 pillboxes and emplacements.
13:47There is a famous line attributed to Shibazaki about a million men being unable to take Tarawa in a
13:53hundred years. The line is almost certainly invented. The island was not. Look closely at how
13:59Batia was built, because every detail of it is an answer to Guadalcanal. Concrete, steel, coconut
14:06logs laid in courses and then covered over with sand. Sand, because sand absorbs a shell rather
14:12than shattering like concrete. Fire lanes interlocking along the beach so that every yard of sand was
14:18covered by a gun that could not be seen from the sand. A log barricade at the high water mark,
14:23and in front of all of it, a coral reef that no landing boat could cross. That reef is the
14:30heart
14:30of the design. Japan had learned exactly one lesson from the Solomons, and they had learned it correctly.
14:37Do not let the Americans get their equipment ashore. Kill them in the water, where a machine is a target
14:44with no traction, and a man is a man wading chest deep at half a mile an hour. For two
14:50days it worked.
14:51The tracked amphibians got across the reef. The Higgins boats behind them did not. They grounded
14:58600 yards out, and the ramps came down and the marines walked in. Batio is the one battle in the
15:05Pacific fought exactly the way the Japanese army wanted it fought. Flesh against concrete. With the
15:12bulldozers still sitting in landing craft that could not reach the beach. In 76 hours, it cost roughly
15:191,000 American dead and more than 2,000 wounded. Remember that number, because it is the price of
15:25fighting without the machine. It comes back later in this story in a way you will not expect.
15:31Now, on the second day, November 22nd, the marines pushing inland ran into the thing that the naval
15:37bombardment had failed to kill. It was a bomb-proof shelter. A mound of sand-covered concrete and logs,
15:44the size of a small hill, sitting east of the main pier, with something close to 150 Japanese inside.
15:52Battleship shells had already hit that area. Airstrikes had already been there. The mound was
15:57intact. It had no firing ports to speak of. The men inside fought out of the doorways,
16:02which meant nothing could be shot into it, and everything had to be carried to it by hand.
16:08The man who went at it was First Lieutenant Alexander Bonnyman, 33, from Knoxville, Tennessee.
16:14He had been running a copper mine in New Mexico, which gave him an occupational deferment. Strategic
16:20materials, war production, stay home. He enlisted anyway, as a private, in 1942. Bonnyman took 21 marines
16:29with flamethrowers and demolition charges at the entrance of that shelter. They were driven back. He pulled
16:35them out, resupplied with grenades and ammunition, and went at it again. And this time, they got up onto
16:41the top of the mound itself, standing on the roof of a structure full of enemy soldiers. Flame and
16:48charges going into the vents and doorways flushed more than a hundred Japanese out into the open, where
16:54Marine riflemen and a tank cut them down. Then, the survivors counterattacked up the slope. Bonnyman
17:02stood at the crest and held it, killed three men, and was shot through the head. Thirteen of his 21
17:09came
17:09off that mound alive. The Medal of Honor citation for that action is one of the plainest in the war.
17:16But the shelter was still there. Still full. Still, in engineering terms, undefeated.
17:24So the Marines sent for a bulldozer.
17:27The 2nd Division's own account of the battle records what happened in a single sentence.
17:32A bulldozer was dispatched to push dirt and sand into the entrances until they were completely covered,
17:38sealing the doom of any Japanese remaining. Another Marine dozer worked along the sides of the mound,
17:44shoving sand up against the firing slits that were still active. Sit inside that structure for a
17:50moment and think about what that sounds like. You are in the strongest building on the island. You have
17:56survived a battleship. You can hear a diesel engine, very close, running at low revolutions. Not the
18:02sound of an attack. Not gunfire. Not shouting. Steady work noise. And the rectangle of daylight at the
18:11doorway gets smaller. And then it is a slot. And then it is a line. And then it is not
18:18there.
18:19Nobody is coming in after you. Nobody is fighting you. You are being filed away.
18:25Here is why this moment matters more than the tonnage of anything used on Baishio.
18:30At Guadalcanal, the bulldozer made American damage temporary and therefore made Japanese effort
18:36meaningless. At Baishio, it did something new. It took the Japanese fortification, the concrete,
18:43the sand, the depth, the sheer excellence of the construction, and turned it around so that it
18:49faced inward. The better the shelter, the better the tomb. A well-built position became a sealed one.
18:57Of 4,836 men on Baishio, about 4,690 died. 17 Japanese servicemen were taken prisoner.
19:07An unknown number of the dead were never actually beaten in a fight. They were closed in. And the
19:13marines moved on. And the island was declared secure. Tokyo studied Tarawa very carefully.
19:20The conclusion was not that the beach defense had been badly built. It was that beach defense as a
19:26concept was finished. The next islands would be held from inside the rock itself, interconnected,
19:32dug deep, with multiple exits and no sand to push. They were designing specifically against the machine.
19:40And 10 months later, on a coral ridge in the Palaus, it worked. For the first time since Guadalcanal,
19:47the bulldozer could not reach the position at all. What the marines did about that did not come from a
19:53factory or a manual. It came out of a scrap pile. September 15, 1944, Peleliu, in the Palau Islands.
20:029.30 in the morning, White Beach 1, the extreme left flank of the landing.
20:08Captain George Hunt, 26, came ashore with K Company, 3rd Battalion, 1st Marines, 235 men,
20:16against a coral promontory the maps called The Point. It was not a hill. It was a wall of jagged
20:24coral rising out of the water, with reinforced casemates cut into the seaward face, including a gun
20:30sighted to fire straight down the length of the American landing beaches. Hunt's marines went up it
20:36with rifles, grenades, and their hands. They took it. Then they were cut off on it for more than 30
20:43hours,
20:43out of water, out of ammunition, absorbing four counterattacks. When relief finally came through,
20:5232 of his men were dead, and 125 were wounded. Hunt and 77 marines were still on their feet.
21:00That is the cost of taking a fortified position by hand, and I want that number sitting in your mind.
21:0578 men left standing out of 235. Because Peleliu is the battle where the Japanese finally built
21:14something the machine could not get to. Look at what Colonel Kunio Nakagawa had to work with.
21:20Running up the spine of Peleliu is the Umer Brogel, a ridge of coral limestone shot through with
21:26fissures and old phosphate mine shafts dug before the war by a Japanese development company.
21:33Nakagawa asked Tokyo for professional mining and tunneling engineers, and he got them. They
21:39converted that honeycomb into roughly 500 mutually supporting positions connected by tunnel.
21:46Now here is the detail that tells you exactly who they were designing against.
21:51The cave mouths were cut on a slant. Not for concealment. A slanted entrance defeats a grenade rolled in,
21:58and it defeats a straight shot of flame. Because flame goes where the geometry sends it. Some positions
22:04got sliding, armored steel doors with openings for a gun that closed when the gun was not firing.
22:10And there was no sand. None. You cannot push coral bedrock over a doorway. The mountain could not be
22:20filled in, pushed over, or rearranged. For the first time since Guadalcanal, the American answer did not apply.
22:29The bulldozer simply could not get to the fight. The Umer Brogel is vertical where it is not overhanging,
22:38and every route up it was covered from above. So Peleliu stalled. Not for the four days that
22:45had been predicted. For 10 weeks. Now watch what the Americans did, because this is the move that
22:53decides the rest of the Pacific War, and it does not look like a weapon at all. They did not
23:00try to
23:01get the machine to the caves. They used the machine to build a way for everything else to reach the
23:09caves.
23:10Bulldozers of Company A, 306th Engineer Battalion, began work on what the maps called the 321st Infantry
23:18Trail, a primitive track around the north end of the ridge. The Army engineers widened it, graded it,
23:25surfaced it, and kept going, forced to bring up armored bulldozers on the stretches that were still
23:30under fire from the ridge above them. Where an anti-tank ditch stopped the marine armor, a tank dozer,
23:37a Sherman with a blade bolted to the front, went forward and filled it in. The official account
23:43gives the time. The armored dozer finished at about 8.30 in the morning, and the tanks got across.
23:50Read those last words again, because they are the whole shape of it. The tanks got across. The dozer
23:58did not kill anyone. It made it possible for something else to arrive. And then the Americans
24:04started improvising, which is the part Japanese planning never accounted for.
24:09On October 16th, engineers ran a hose 300 yards forward from fuel tanks set up in covered positions
24:15behind the lines and simply pumped oil into a large cave. Then they lobbed white phosphorus grenades in
24:23after it. It worked so well that it stopped being an experiment and became the standard method used across
24:29the whole pocket. A length of hose, a fuel drum, and a hand grenade. That combination is not in any
24:37field
24:37manual printed before 1944. On the afternoon of October 25th, the engineers finished a coral ramp up the
24:46east wall at the north end of a feature the Americans called Wildcat Bowl, so that tanks and flame-throwing
24:53amphibian tractors could drive into the central hollow of the last Japanese stronghold, the China Wall.
25:00Think about what the previous six weeks had been like inside that mountain, and what that ramp meant
25:06to the men watching it grow. Nakagawa's entire concept required the Americans to come up to him, on foot,
25:13into the geometry he had cut. That was the bargain. His men would die, but they would take a devastating
25:19number of Marines with them, the way they had at the point. Instead, the Americans were down below,
25:25with earth-moving equipment, changing the mountain. Every day the road was longer. Every day the ramp
25:31was higher. Nothing the garrison did slowed the grating. And when the road reached a cave mouth,
25:38what came up it was not infantry to be fought at close quarters. It was a flame tank, or a
25:43hose.
25:45On November 24th, with the pocket reduced to a few hundred yards, Nakagawa burned his regimental
25:51colors and took his own life. Pelelu was declared secure on the 27th. And then this line appears in
25:58the record, and it is the coldest sentence in the entire campaign. The battalion paused to blow in
26:05every cave the men were able to discover, as a precautionary measure against reoccupation.
26:11The sealing had stopped being an act of combat. It had become housekeeping.
26:16The Japanese officer who studied Pelelu hardest was a 53-year-old lieutenant general who had spent
26:21time in the United States and had no illusions about American industry. He took Nakagawa's method
26:27and pushed it further than anyone had gone—11 miles of tunnel inside a volcanic island of 8 square miles,
26:34with a written order forbidding his men to do the one thing the Japanese army had always done.
26:39He was building a defense the machines could never reach. He was also, without knowing it,
26:46building something else. June 8th, 1944. A Japanese general steps off an aircraft onto an
26:538 square mile island of volcanic ash, 650 miles south of Tokyo, and starts walking. Lieutenant General
27:01Tadamichi Kuribayashi, 53, had spent two years in the United States in the late 20s as a deputy military
27:09attache, studying at Harvard and driving across the country by automobile. He had seen Detroit. He had
27:16written to his family that America was the last nation on earth Japan should ever fight. Now he had been
27:23handed Iwo Jima and told to hold it. What he did first was cancel the plan he had been given.
27:29The existing
27:30scheme was the one Japan had used since 1942—meet the Americans at the water. Kuribayashi had read what
27:38happened at Tarawa, and he had read what happened at Saipan, and he refused. He pulled the defense back off
27:45the
27:45beaches and ordered it underground. Then he banned the bonsai charge outright—the mass attack that had
27:52ended every island garrison before his. His written vows to the garrison contained the arithmetic he
27:58expected instead. Every man was to kill 10 Americans before he died. Then 21,000 men picked up shovels,
28:08and for eight months they dug. The plan called for nearly 17 miles of tunnel. They completed roughly
28:1611. Some hills were given five separate underground levels. Suribachi, at the southern tip, was hollowed
28:25into something like a seven-story building inside the rock. Chambers ranged from holes for one rifleman
28:32to rooms that held several hundred men with hospitals, generators, water cisterns,
28:38and command posts, and gun positions with concrete walls several feet thick, and ventilation shafts
28:45because without them the tunnels filled with sulfur. The digging itself was punishing beyond anything the
28:52Americans had to do. In the hot zones near the volcano, men could work only about 15 minutes at a
28:58stretch before the heat and the sulfur fumes drove them out. Water was rationed to a canteen a day in
29:05places. Dysentery went through the garrison. They dug anyway, month after month, in ground that smelled
29:13like a struck match. And now I want to show you what Kuribayashi spent that labor defending against,
29:20because it is the hinge of this entire story. He prepared, thoroughly and intelligently, for tanks.
29:29He had hundreds of guns and mortars and around 70 dedicated anti-tank guns. He had mines and buried
29:37aerial bombs with pressure fuses and demolition teams trained for the close attack. And he had Colonel
29:44Baron Takeichi Nishi and the 26th Tank Regiment. Nishi was, by a distance, the most famous man on that island.
29:53He had won the Olympic gold medal in show jumping at Los Angeles in 1932, and he had been photographed
30:00with Hollywood actors. In July 1944, the transport carrying his regiment to Iwo Jima was torpedoed by
30:07the submarine Cobia, and all 28 of his tanks went to the bottom. Nishi went back to Tokyo, argued 22
30:15replacements out of the army, and shipped them out again. And when those 22 tanks arrived on an island of
30:21soft black ash and broken rock, he did not use them as tanks. He had them dug into the ground,
30:27up to their turrets, and camouflaged as fixed gun positions, cited to kill American Shermans.
30:34Sit with that image for a second, because it is the clearest possible statement of what the
30:38Japanese army believed the war had become. Their own armor, driven into holes and buried,
30:44so that it could shoot at enemy armor. By February 1945, Kuribayashi had built the
30:50most complete anti-tank fortress in the history of the Pacific War. Every element of it was aimed at
30:56a machine that shoots. There is no order from him anywhere about the machine that doesn't.
31:02Meanwhile, 4,000 miles east, American planners were looking at photographs of those same beaches,
31:07and reaching a conclusion of their own. The terraces above the waterline were loose volcanic ash,
31:14not sand, ash, with the consistency of dry coffee grounds. Wheels would not move in it. Trucks would
31:22bury themselves. Everything they had learned since Guadalcanal said the battle would be decided by whether
31:27equipment could get inland. And this beach was specifically designed by geology to prevent that.
31:34So they did something no assault plan had done before. They put the construction battalions
31:39into the assault. The 31st Naval Construction Battalion was attached to the 5th Marine Division,
31:45and the 133rd to the 4th. And both were scheduled ashore less than an hour behind the leading waves.
31:52Not as follow-on labor, but as part of the landing itself, with their equipment. They brought D8s,
31:59132 to 148 horsepower, considerably heavier than the tractors the Marine Divisions carried themselves.
32:07They brought rolls of steel matting to lay a floor over ground that had no floor.
32:13Think about what that order actually asked of those men. A bulldozer has no armor. It sits its driver
32:20six feet in the air, in the open, moving at walking pace, on a beach covered by artillery that has
32:26been
32:26registered on it for eight months. The machine cannot shoot back and cannot take cover. And the plan
32:33required it to be ashore while the beach was still contested. Because nothing else could happen until
32:39it was. February 19th, 1945. The Marines land at nine in the morning. By noon, the first bulldozer is
32:48coming down a ramp onto Red Beach, and the man in the seat is Seaman First Class Ben Massey of
32:53the 31st
32:54Seabees. He gets a very short distance before a bullet hits him in the neck. Everything the
33:00Japanese had built for eight months, and everything the Americans had learned in two and a half years,
33:05comes down to what happens next on that beach. In the next 10 seconds, around one stalled 20-ton
33:12tractor with a wounded man on it. Machinist mate Hollis Cash was on that beach. He climbed onto the
33:18tractor, got Massey off it, took the seat himself, and went back to work. The machine did not stop.
33:25And here is something that tells you how well the Americans understood what they were sending those
33:29men into. Before the landing, Rear Admiral Harry Hill and his chief beach master, Captain Carl Anderson,
33:36a merchant seaman by trade, known throughout the fleet as Squeaky because of his voice, had sat down
33:42and fabricated armored shields for the bulldozer operators. Plates. Bolted on. Because both men knew
33:49perfectly well that a Seabee sitting six feet up in the air on a diesel tractor was going to be
33:54the most
33:54attractive target on Iwo Jima. That is a remarkable thing to have anticipated. They were not protecting
34:01equipment. They were protecting the specific man in the specific seat because they knew the Japanese
34:07would go for him. Now look at what those operators were facing. Because the beach at Iwo Jima was not
34:13a beach in any useful sense. Above the waterline, the ash rose in terraces, some of them 15 feet high,
34:20with the consistency of dry ash all the way down. A wheeled vehicle did not slow down in it. It
34:27sank.
34:27Landing craft came in, dropped ramps, and the vehicles that drove off them stopped moving within a few yards
34:33and stayed there. Behind them, the next wave arrived, and the next. And the surf broached the boats sideways
34:40and piled them up, and the whole assault began to solidify into a junkyard under artillery fire that had been
34:47pre-registered on that sand for eight months. This is the moment Kuribayashi had designed the entire battle around.
34:54Pin them on the beach. Let the guns on the high ground work. The American assault dies in the ash.
35:02Hill and Anderson had two answers ready, and both of them were earth-moving. The first was the matting,
35:08steel plank modified so it could be unrolled out of the back of a tracked vehicle, laying an instant road
35:14across ground that would not carry weight. The second was the bulldozers, and their job was to cut exits
35:22straight through the terraces, drive at a 15-foot wall of ash, take the top off it, push a ramp
35:29out of
35:29the same material, and make a road where the geology said there could not be one. They did it under
35:35direct
35:36fire, at walking pace, in the open, all day. The matting chewed up almost immediately under hundreds
35:43of tracked vehicles. They laid more. The dozers dragged wrecked landing craft and burned out amp
35:50tracks out of the way so the beach could keep receiving, and cut more exits, and filled more holes.
35:57And then the sentence that matters. The matting and the ramps permitted medium tanks to get off the beach
36:04and into the battle. I want you to hold the two halves of that together. Kuribayashi had buried
36:10Berenishi's tanks in the ground to kill Shermans. What decided whether those Shermans ever arrived was
36:17not armor, not gunnery, and not courage under fire. It was whether an unarmed tractor could build a road
36:25up a sand terrace fast enough. Inland, the same pattern repeated at every obstacle. The Japanese had cut
36:32anti-tank ditches across the approaches to the airfields, which stopped marine armor exactly as
36:38intended. Until, a tank dozer and an armored bulldozer went forward and filled the ditch in,
36:44and the tanks crossed and kept going. The official history times one of these actions to the minute.
36:50The dozer finished around 8 30 in the morning, and the armor went across. None of this was heroic
36:56looking. It was a work crew on a battlefield. The 133rd Naval Construction Battalion alone took 245
37:05casualties on that island. 42 men killed, 203 wounded, which is a casualty rate that would have broken
37:12most infantry battalions, absorbed by men whose formal job description was building runways.
37:18Now put yourself inside the rock for a moment, because the Japanese view of this is the part that
37:23never gets told. Kuribayashi's system was not being defeated. That is the strange thing. His tunnels
37:30were intact. His guns were firing. His men were doing exactly what his vows had asked of them,
37:37and they were killing Americans at a rate that would produce the only battle of the Pacific War
37:41in which the attackers suffered more casualties than the defenders. And yet from the observation slits,
37:48day after day, the island was changing shape. Roads existed where there had been no roads. The wrecked
37:55beach cleared itself. Vehicles that had been stuck were not stuck anymore. A ditch that had taken weeks
38:02to dig was gone in 20 minutes, and the tanks it had been dug to stop were now behind it,
38:08working up a
38:08slope toward positions that had been sited on the assumption that no vehicle could ever get there.
38:14Their fortress was holding. The island it was built into was being rebuilt around them.
38:20And on March 4th, with the battle at its absolute worst, marines dying by the hundreds daily on the
38:27Motoyama Plateau, more than a third of the island still firmly in Japanese hands, Kuribayashi still alive
38:34and still issuing orders from underground, something came out of the north. A B-29, crippled, low on fuel,
38:42unable to reach the Marianas. Her name was Dinah Might. She put her wheels down on airfield number one,
38:51on Iwo Jima, in the middle of a battle that had 18 days left to run, on a strip that
38:57Seabees had been
38:58grating and filling while shells were still landing on it. She took on fuel. She checked her systems.
39:05And then she took off again and flew home. Every Japanese soldier on the high ground with a view of
39:11that runway watched an American heavy bomber land on their island, refuel, and leave.
39:18That aircraft is the answer to the question this whole story has been building toward. And not for
39:24the reason you are probably thinking. Here is why that aircraft is the answer. And it has almost
39:29nothing to do with the value of the airfield. Kuribayashi's entire defense was an arithmetic
39:35proposition. He could not win. He knew that before he landed on the island. What he could do was sell
39:42time. Make Iwo Jima cost so much and take so long that the Americans would think hard about the next
39:49island, and the one after that, and about what an invasion of Japan itself would mean. Every man in
39:56those tunnels was spending his life to buy delay. On March 4th, with 18 days of battle still to go,
40:03and the northern third of the island still his, the delay stopped being bought. The island began
40:09working for the enemy while the garrison was still alive inside it. Two days later, on March 6th,
40:16it got worse. P-51 Mustangs of the 15th Fighter Group flew in and based themselves there, and then
40:23flew close support missions against the Japanese still holding the north end. Men in the tunnels were
40:28being attacked by aircraft taking off from ground they were still defending, operating from a strip that
40:34had been graded and filled by Seabees under fire. Before the war ended, something like 2,400 American
40:42aircraft would put down on those fields in emergencies, carrying crews numbering in the tens of thousands.
40:48That is the strategic half of the answer to our question. Now here is the personal half,
40:54and it is smaller and much colder. When the battle was declared over on March 26th,
41:00several thousand Japanese were still alive underground. The Army's 147th Infantry Regiment
41:07stayed on Iwo Jima from March until September, doing nothing but working the cave systems.
41:13Flamethrowers, satchel charges, demolitions. The regiment accounted for 1,602 Japanese killed in small
41:21unit fighting, took 867 prisoners, and the accounts add a phrase that covers an unknown number more.
41:30Along with many others who died in sealed caves. The 147th lost 15 men killed doing it.
41:39Look at that exchange rate and then think about what it means for a soldier's decision making
41:43inside the rock. Because this is the mechanism the whole story has been driving at.
41:49A tank is an enemy. You can see it, you can hear it, you can hate it. And your army
41:55has given you a way to fight it.
41:57The mine, the satchel charge, the pole charge, the ditch, the buried gun. All of those methods are
42:04terrible, and most of them kill the man who uses them. But look at what they offer in return. A
42:10tank
42:11crew. A burning vehicle. A result. Something that happened, that other men saw, that gets written into
42:18a report and sent home to a family as the reason a man is dead. A bulldozer offers none of
42:25that. And this
42:26is the exact point. It does not enter your killing zone. It is not trying to get into your position
42:32at
42:32all. It is removing your position from the map, from the outside, at walking pace, with the same
42:38gearbox and the same blade that built a road that morning. You cannot trade your life for it, because
42:44there is nothing to trade with. Knock out the operator, and another man climbs into the seat,
42:50and the machine keeps working. That happened on Red Beach, in front of witnesses, on the first day.
42:56Fight it, and you achieve nothing. Wait it out, and there is nothing to wait for. Nobody is coming in.
43:04The daylight narrows, and then there is no daylight. And whatever happens after that,
43:09happens without an enemy in the room, without a count, without a body to recover,
43:14and without a name attached to it. And now the cruelest part. The part Japanese
43:19engineering could not have foreseen, because it is the exact inversion of everything they got right.
43:25At Betio, they built with sand, because sand absorbs shells. And sand is what a blade pushes.
43:31On Peleliu, they cut cave mouths on a slant, so grenades would roll out and flame would deflect.
43:38And a slanted opening still fills with rock. On Iwo Jima, they dug 11 miles of tunnel with multiple
43:45exits, so the position could never be reached from outside. And a system nobody can enter,
43:50is a system nobody can leave, once the entrances are closed. Every single design improvement made the
43:57seal more final. The better their engineers were, the more complete the trap became.
44:03That is why Japanese fortification reached its absolute peak in 1945, and had less effect than
44:10ever. On Okinawa, it became routine. General Simon Buckner gave the method its name. Blowtorch and
44:19corkscrew. Flame to drive them in. Demolitions to close them up. 10th Army engineers ran 200 to 300
44:26feet of hose from 1,000 gallon distributors and pumped gasoline into cave systems, then set it off
44:33with tracer fire, or phosphorus. And the official history notes that the explosion did not merely burn
44:38a cave out, it produced a multiple seal. In one division's records alone, 273 caves sealed, 317
44:47emplacements destroyed. Let me be straight with you about the evidence, because it matters. No
44:53Japanese officer left behind a memo that says, in so many words, we fear your tractors more than your
44:59tanks. What the record leaves instead is the shape of what they built and what they did. They designed
45:06against grenades. They designed against flame. They designed against naval gunfire. They buried their
45:13own tanks in the ground specifically to kill Sherman's. And on Okinawa, they raised an anti-tank
45:19company of a hundred men armed with satchel charges and nothing else. And everyone in it understood it
45:26was a suicide unit. They had an answer for every armed machine the United States owned. They never built
45:33one for the unarmed one. And by the last summer of the war on Okinawa, Japanese soldiers surrendered
45:39in numbers no one in the Pacific had ever seen before. There are still roughly 12,000 Japanese
45:46soldiers on Iwo Jima who have never been recovered. And on that same island, three and a half years
45:53after the surrender of Japan, two men were still living underground. And what finally brought them out
45:59is the strangest footnote in this entire story. Go back to the rain on Mono Island one last time.
46:06Aurelio Tasson came off that beach alive. He was promoted to machinist's mate first class
46:12and given the silver star. And Lieutenant Turnbull, who had walked beside the track with nothing but a
46:18carbine, got one too. The story went home, ran in the papers, turned up in comic books, and is generally
46:26credited with inspiring the climax of the Hollywood picture about the Seabees that John Wayne made the
46:32following year. A 24-ton tractor named after a man's wife became, briefly, a famous piece of American
46:40equipment. Ben Massey survived the neck wound he took on Red Beach on the first morning of Iwo Jima.
46:48Hollis Cash, who had climbed into his seat while the beach was still being shelled, finished the job that
46:53afternoon and kept working for the next 35 days. Captain George Hunt came off the point with 77 men
47:01and later came home and wrote a book about it called Coral Comes High. He had been a magazine
47:07writer before Pearl Harbor. In the 1960s, he became managing editor of Life. And there is one more.
47:15First Lieutenant Alexander Bonnyman, the mining engineer from Knoxville, who had a deferment and enlisted
47:21anyway, was killed on the roof of that bomb-proof shelter on Batio. In the days that followed,
47:28the marines buried their dead in long trenches in the sand, and the trenches were covered by a bulldozer,
47:34the same kind of machine doing the same motion that had sealed the shelter he died attacking.
47:41Then the war moved on. The island was rebuilt as an airbase. The burial maps stopped matching the ground,
47:48and he was lost. He stayed lost for 72 years. His grandson, Clay Bonnyman Evans, spent 10 years going
47:58back to that island with a non-profit called History Flight, working old maps and ground-penetrating
48:04radar and, eventually, a cadaver dog from California named Buster. In May of 2015, they found the trench.
48:13Thirty-six marines were in it. Bonnyman was the first one identified. On September 27, 2015, he was buried
48:21in Knoxville, next to his parents, with marine helicopters overhead in missing man formation.
48:27His daughter had accepted his Medal of Honor in 1947, when she was 12 years old.
48:33Now the other side of the ledger, because it deserves to be stated plainly.
48:38Kuribayashi's body was never found. Baron Nishi, the Olympic gold medalist who buried his own tanks
48:44in the ash, died somewhere in the north of Iwo Jima in March 1945, and no one is certain where.
48:52Roughly 12,000 Japanese soldiers remain on that island, unrecovered, under the rock they dug.
48:59And two of them came out. On January 6, 1949, three and a half years after the surrender of Japan,
49:07nearly four years after the battle ended, two machine gunners named Yamakage Kufuku and Matsudo
49:14Linsoki surrendered on Iwo Jima. They had been living underground the entire time.
49:19The men they surrendered to were United States Air Force personnel of a support wing,
49:24because by then the island was simply an American airfield and had been for years.
49:29The runway had never stopped operating. The war had ended above their heads,
49:34and the work had just kept going. So why the unarmed machine? Because Japan's whole strategy
49:41after 1943 was an exchange. Ground for time, lives for cost. And every weapon in the Japanese
49:49inventory was built for that exchange. The satchel charge, the pole mine, the buried tank,
49:55the interlocking fire lanes, the tunnels. All of it was designed to make an American pay to come and
50:01take something. A Sherman offered that deal. A Sherman could be fought, and hit, and burned,
50:08and a man who died doing it, died as a soldier in front of witnesses. The bulldozer refused the deal
50:15entirely. It did not come to take the position. It came to remove it, at three miles an hour,
50:22with a blade that had been grading a supply road an hour earlier. And against that, there was nothing
50:29to trade. Nothing to hit that mattered. And no version of dying that purchased anything at all.
50:36The better the fortress, the more thorough the burial. That is the whole answer. And it took two
50:43and a half years and five islands to arrive. Which leaves the last thing worth saying, and it isn't
50:50about machinery. Those tractors did not drive themselves. In every one of those seats was a
50:57man sitting six feet in the air, in the open, with no gun, on a beach where everything that could
51:03shoot
51:03was shooting. And a great many of them were not young. The Seabees had recruited experienced
51:10construction men, foremen, operators, mechanics in their thirties and forties. Men who had built roads
51:17and dams through the depression, and who could have stayed home. They took the job at walking pace,
51:23because that was the speed the work required. That is what the Pacific War finally came down to.
51:29Not a better weapon. American workmen, doing the job in front of them, one blade width at a time.
51:37Thank you for watching all the way to the end. If this told you something you hadn't heard before,
51:42a like genuinely helps. It's the signal that pushes this story in front of other
51:46people who would want to hear it. Subscribe and turn on the bell if you'd like the next one,
51:51because there are a lot of stories like this that never made the newsreels.
51:55And I'd like to hear from you in the comments. Tell me where you're watching from, and if your father,
52:00grandfather or uncle served in the Second World War, in the Pacific, in Europe, in any of the Allied
52:06armies, tell me his name and his unit. Those names belong in the record, and this is as good a
52:12place
52:13as any to put them.