One P-47 vs 23 Messerschmitts — The Dive Maneuver That Shouldn’t Have Worked

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Today’s story is about a deadly gap in US Navy anti-aircraft defense that cost ships and lives during 1943 and 1944.

Their existing weapons couldn’t close this gap.

This is how the Navy reached a breaking point and what changed everything.

The year is 1944.

Off the coast of the Philippines, the sky is filled with enemies.

For the gun crews of a US Navy aircraft carrier, the shriek of a diving Japanese bomber shrinks their world to a terrifying point.

As the general quarters alarm blar, men on the flight deck scramble for cover.

The carrier’s outer defensive ring, the mighty 5-in guns, throws up a curtain of black flack, but the attacker is too fast, jinking wildly.

He closes, entering the medium-range envelope.

The ship’s quad-barreled machine cannons, heavy water- cooled guns that crews distrusted for jamming, begin their stuttering cough.

Tracers reach for the plane, but it barrels through.

The last line of defense, the small caliber to 20 mm cannons, opens up in a desperate roar.

Their fire looks impressive, but the shells are too light, punching small holes, but lacking the stopping power to knock the plane from the sky.

The bomber, trailing smoke but still flying, gets terrifyingly close before its bomb skips across the water and slams into a nearby destroyer.

The explosion is sickeningly familiar.

This was the tactical crisis, a fatal gap in American anti-aircraft defense.

US warships had weapons for longrange and pointblank defense, but nothing in between had the speed, reliability, and destructive power to stop a determined high-speed attack.

The problem had been building for months, visible in afteraction reports from across the Pacific.

Commander James Russell, gunnery officer aboard the carrier USS Intrepid, had watched the same nightmare play out during operations in the Marshall Islands.

His ship’s 5-in dualpurpose batteries using the war-winning VT proximity fuse could shred bomber formations beyond 5,000 yards.

But the fuses required time for radar data and gun training.

time the mounts lacked against nimble, lowaltitude attackers, closing at 300 knots.

Russell watched helplessly as Japanese dive bombers punched through that outer umbrella, reaching the medium range where his ship’s anti-aircraft armament was a mess of overlapping fire.

Gunners openly cursed the 1.1 in quad mounts.

Prone to overheating and jamming, their theoretical rate of fire collapsed in combat as crews fought malfunctions.

Even when the guns worked, their shells lacked the destructive punch to guarantee kills against modern all- metal aircraft with self-sealing fuel tanks and armor.

The 20 mm Oricon cannons scattered across every American warship represented the last desperate chance.

Sailors loved their simplicity and reliability, but combat revealed brutal limitations.

A 20 mm high explosive shell weighed less than 5 o while devastating against older fabriccoed aircraft.

It was inadequate against robust warplanes like the Mitsubishi A6M0 or the Yokosuka D4Y dive bomber.

Gunners needed sustained hits.

But in the chaotic seconds of a high-speed attack, such accuracy was nearly impossible as ships often survived only because the sheer volume of tracers unnerved pilots enough to throw off their aim.

It was psychological defense, not physical destruction, and everyone knew it.

Lieutenant Robert Copeland, commanding the destroyer escort USS Samuel B.

Roberts, understood the gap from a small ship’s perspective.

His escort carried a fraction of the firepower of a fleet carrier, relying on a single slow training 5-in gun and numerous 20 mm cannons.

During the invasion of Saipan in June 1944, Copeland watched Japanese aircraft exploit the zones his guns couldn’t cover.

Attackers would approach at medium altitude, beyond effective 20 mm range, but too close and too fast for the 5-in guns fire control.

They released torpedoes or bombs from positions where his gunners could only watch.

During one evening attack, Yea Nakajima torpedo bomber slipped through the screen’s fire and sank a landing ship, killing 63 men trapped inside.

Copeland’s afteraction report was stark.

We lack an effective intermediate range anti-aircraft gun that can track fastmoving targets and deliver sufficient destructive force to guarantee kills.

Across the fleet, gunnery officers compiled similar observations.

The Battle of the Philippine Sea in June 1944, the war’s largest carrier battle, showed both the strengths and weaknesses of US anti-aircraft defenses.

Under Vice Admiral Mark Mitcher, Task Force 58 assembled an immense fleet of 15 carriers, seven battleships, and dozens of cruisers and destroyers.

When the Japanese launched 373 aircraft, American combat air patrols and anti-aircraft fire created what pilots called the Mariana’s Turkey shoot, destroying over 300 enemy planes.

But the victory masked troubling details.

American ships expended staggering quantities of ammunition.

The battleship USS South Dakota alone fired over 27,000 rounds.

Despite this overwhelming volume, individual Japanese aircraft repeatedly penetrated to close range.

The carrier USS Bunker Hill took a bomb hit that killed three men and wounded 73.

The defense worked through sheer volume, not efficiency.

The conclusion was clear.

Warships were burning ammunition at unsustainable rates, yet determined attackers still got through.

The tactical problem intensified during the Battle of Lady Gulf in October 1944.

On October 25th, as escort carriers of Taffy 3 fought off Japanese battleships, subsequent air attacks revealed how desperate the anti-aircraft situation had become.

The Japanese pilots, emboldened by earlier successes, pressed attacks with suicidal determination.

The escort carrier USS St.

Low, armed with a typical 5-in gun and multiple 20 mm mounts, fought off several attacks before a damaged Zero deliberately crashed into her flight deck.

The resulting aviation gasoline explosion consumed the ship in 18 minutes.

Survivors saw their 20 mm gunners hit the Zero repeatedly, tracers striking its fuselage and wings, but it never wavered.

The shells passed through the thin aluminum skin without stopping the plane’s momentum.

Fire control, Secondass John Bernard, blown overboard, later told investigators the crews had done everything right.

The weapons themselves simply lacked the power to stop the attack.

That same day, the destroyer escort USS Raymond took a kamicazi hit despite throwing up a wall of defensive fire.

Quartermaster Thirdclass William Brooks on the bridge remembered the continuous roar of the ship’s guns.

He watched the Zero approach through a sky filled with tracers, saw pieces of its wing torn away, and smoke stream from the engine.

The plane kept coming.

At the last moment, Brooks dove behind a bulkhead as the Zero struck the superructure.

The explosion killed 27 men.

In the hours that followed, while helping the wounded, Brooks heard the burned chief of a 20mm gun crew repeat the same question.

Why didn’t it go down? We hit it.

We saw the hits.

Why didn’t it go down? Japanese naval aviation commanders recognized the weakness and adapted their tactics.

These magic intelligence intercepts revealed Japanese pilots were briefed on American anti-aircraft gaps.

Attackers were told to approach low to avoid the 5-in barrage, then pop up inside 3,000 yards to release weapons and dive away.

This kept them in the least defended zone for the maximum time.

Afteraction analysis of attacks on Task Force 38 off Formosa confirmed this tactic tripled the hit probability compared to conventional bombing runs.

By November 1944, the kamicazi threat became an existential crisis.

The Japanese special attack units eliminated the assumption that pilots wanted to survive.

A damaged plane could still be a lethal weapon.

American ships lacked weapons that could guarantee stopping them in that crucial middle range.

On November 29th, kamicazis attacked the cruiser USS Louisville off Ley.

That the ship’s 5-in guns downed three attackers at long range, but two more broke through.

The Louisville’s 20 mm crews opened fire, but had only seconds to engage.

One kamicazi, a Yokosuka D4Y, absorbed hits from multiple 20 mm mounts without faltering before striking the main deck and detonating in a crew compartment.

The blast killed 32 men and wounded 56.

The ship survived, but her crew was shaken and her structure compromised.

Captain Frederick Musberger, commanding destroyer squadron 12, compiled engagement data from October to December 1944.

His Fletcherclass destroyers represented the standard fleet configuration.

The numbers told a grim story.

His data showed that against conventional aircraft, his squadron averaged one kill per 400 rounds of 5-in ammunition and 1,800 rounds of 20 mm.

Against kamicazis, these ratios collapsed as suicide aircraft absorbed damage that would force a conventional attacker to break off.

Mooseberger’s report to Pacific Fleet headquarters concluded that existing weapons could not provide reliable defense against determined suicide attacks.

His report concluded that a new rapidfiring intermediate range gun was needed, one with enough power to physically disable an aircraft, not just damage it.

At Pearl Harbor, staff at Commander-in-Chief Pacific Fleet Headquarters studied the mounting evidence with alarm.

In a priority dispatch, Vice Admiral John McCain warned that kamicazi attacks threatened American naval superiority.

His task force could surround carriers with screening ships, but individual attackers kept getting through.

The math was brutal.

If even 10% of kamicazi attacks scored hits during a sustained campaign, the fleet would suffer unacceptable losses.

The fleet desperately needed a weapon that could kill reliably in the 2,000 to 4,000yard range, track fast targets, deliver enough force for physical destruction, and sustain a high rate of fire without jamming.

Every existing weapon failed at least one of these requirements.

The urgent request went to the Bureau of Ordinance.

Find a solution or prepare to watch the fleet burn.

The first installations began in early 1942 at the Navyyard in Philadelphia, where welders cut mounting circles into the decks of destroyers and worked double shifts to bolt down the new pedestals.

The mounts arrived in wooden crates stamped with Chrysler Corporation markings.

Each component wrapped in thick brown wax paper that peeled away to reveal gleaming steel machinery more sophisticated than anything the gunners had seen before.

Unlike the simple ring and post arrangements of earlier anti-aircraft weapons, these mounts featured complex gear trains, hydraulic power assists, and precisely machined elevation wheels that turned with a smoothness, suggesting fine watchmaking rather than combat hardware.

Chief gunner’s mates gathered their crews around the new weapons, walking them through the loading procedure.

four round clips sliding into feed guides on each barrel, spring-loaded mechanisms stripping rounds into the brereech, and ejection shoots spitting spent casings over the side in gleaming arcs.

The ammunition arrived in wooden boxes stencled with yellow lot numbers.

Each 40 mm shell was a miniature artillery round with a brass case longer than a man’s hand and a projectile topped with a tracer element that would burn white hot.

Sailors accustomed to the lightweight 20mm weapons felt the heft of these new shells and understood something fundamental had changed in the Navy’s approach to air defense.

The quad mounts especially drew attention.

Massive assemblies weighing nearly 8 tons fully loaded, requiring dedicated platforms reinforced with structural beams below decks to handle recoil forces.

During test firings off the Virginia Capes, the deep hammering rhythm carried across the water like synchronized pile drivers and the spray of water eruptions where tracer streams converged told gun crews they were handling something capable of shredding aircraft at ranges the 20 mm could only dream of reaching.

This was the 40mm Bow Force anti-aircraft gun, Mark 1, Mark 2, and Mark III variants in twin and quad mount configurations licensed from the Swedish firm AB Bow Force and manufactured under contract by Chrysler, Firestone, and others.

The weapon fired a 40mm by 311R cartridge, a 2-lb high explosive projectile with a muzzle velocity of 2,890 ft pers, achieving effective ranges of 5,000 yd horizontal and 11,000 ft vertical, though the practical ceiling against maneuvering aircraft was closer to 8,000 ft.

The basic Mark1 twin mount, common on destroyers and cruisers, weighed approximately 17,000 lbs and featured two barrels cycling at 120 rounds per minute each for a combined rate of 240 rounds per minute.

The Mark 2 quad mount, mounted primarily on carriers and battleships, doubled that firepower with four barrels delivering 480 rounds per minute with its six-man crew.

Each mount incorporated the Mark 51 director, a gyroscopically stabilized computing site.

Mounted separately, it allowed a pointer to track the target while the director calculated lead angles and transmitted firing solutions to the guns.

The system entered service aboard USS Savannah in April 1942, followed by rapid installation across the fleet as production accelerated.

By war’s end, American factories had produced over 39,000 barrels in various mount configurations with some 60,000 additional barrels made for the army.

The weapon solved a critical tactical gap.

The large 5-in/38 guns were too slow to track close-in attackers.

While the fast-tracking 20 millimeter orlicon fired a projectile too light for guaranteed kills, the bow force occupied this middle range, combining a destructive shell with a rate of fire sufficient for a protective barrage.

The weapons combat debut came during the November 1942 naval battle of Guadal Canal where the anti-aircraft cruiser USS San Diego CL53 mounting 14 quad bow force engaged Japanese air attacks against the transport fleet off Lunga Point.

During a raid by 18 Betty bombers on November 12th, San Diego’s crews tracked the incoming formation at 8,000 ft, waiting until the aircraft closed to 4,000 yd before opening fire.

The quadmount swived in unison, but their tracer streams, creating glowing nets that converged on the lead bomber.

Within seconds, the Betty’s port engine erupted in flame, and the aircraft rolled over, plunging into the sea.

Two more bombers took hits.

One trailed smoke as it turned away.

Another broke formation with its Bombay doors jammed.

The 4-minute engagement saw San Diego’s 14 Bow Force mounts expend over 2,800 rounds, claimed three confirmed kills and two probables, and demonstrated a hit probability three times higher than the 20 mm weapons.

Gun crews reported the Bowfor’s heavier recoil felt solid and controlled, unlike the chattering vibration of the Orlicons, and the larger shell splashes made spotting fire far easier.

The weapon’s next major test came during the invasion of Sicily where German Ju88 bombers attacked the invasion fleet on July 11th, 1943.

The destroyer Maddox DD622 with two twin Bow Force mounts detected incoming aircraft on radar and fired as the first bomber emerged from clouds at 6,000 yd.

The forward Bowforce mount, controlled by its Mark 51 director, followed the diving bomber, pouring shells into the aircraft’s path until a hit in the wing route sent it cartwheeling into the sea.

Within 20 minutes, the ship’s Bowforce crews engaged seven separate attackers, claiming two destroyed and three damaged.

The Bow Force truly proved its worth in the Pacific Theater, particularly during the carrier battles of 1944.

At the battle of the Philippine Stower Sea on June 19th, 1944 during the great Mariana’s Turkey shoot, the carrier USS Lexington CV16 mounted eight quad Bowfors in sponssons along her flight deck and hull, creating overlapping fields of fire.

When Japanese strike aircraft penetrated the American fighter screen, Lexington’s Bow Force opened fire at ranges exceeding 5,000 yards, creating a curtain of fire Japanese pilots later called a steel curtain impossible to penetrate.

During the dayong battle, Lexington’s anti-aircraft batteries claimed 17 aircraft destroyed with the Bowfors accounting for 11 confirmed kills.

Observers noted that aircraft hit by 40 mm shells rarely survived.

The high explosive projectiles punched through aluminum skin to detonate inside wing structures or engine cowlings, causing catastrophic failures that sent aircraft tumbling from the sky.

This stood in stark contrast to the 20 mm, which often required multiple hits.

The weapon’s effectiveness increased dramatically with proximity fused ammunition introduced in limited quantities in 1945, which detonated automatically when passing near an aircraft.

During the Okinawa campaign, the destroyer USS Hugh W Hadley DD774 equipped with six twin Bow Force mounts and this new ammunition shot down 23 aircraft in a single day on May 11th, 1945 while on radar picket duty 15 mi north of Okinawa.

The Bow Force faced its ultimate test against the Kamicazi where deterrence failed against pilots committed to suicidal crashes.

On April 6th, 1945, during the first day of mass kamicazi attacks against the Okinawa fleet, the destroyer USS Laffy DD724 on radar picket duty encountered wave after wave of suicide aircraft.

Between 0830 and 0947, Laffy’s crew fought off 22 separate aircraft, including Val, Zeros, and Oscars, diving from multiple directions.

The ship’s four twin Bow Force mounts fired continuously for over an hour, barrels glowing cherry red as crews rotated out from exhaustion and wounds.

The forward Bowforce mount tracked a diving valve from 4,000 ft.

Shells walked up the aircraft’s fuselage until the bomber disintegrated 50 yd over the deck, raining pieces on the superructure.

A second mount engaged a zero, skimming the waves and its shells tore through the fighter’s engine, sending it cartwheeling into the sea 100 yd away.

Despite shooting down nine aircraft and damaging several others, six kamicazis struck home, killing 32 men and wounding 71.

Yet Laffy survived.

A testimony to both the Bowfor’s effectiveness and the sheer weight of mass suicide attacks.

Analysis revealed the Bowfors achieved hit probabilities of approximately 14% against diving targets compared to 6% for the Orlicans and 9% for the 5in battery.

The weapon demonstrated remarkable reliability, though not without limitations.

The water- cooled barrels could maintain continuous fire, but crews discovered the Mark 51 Director’s gyroscopes could tumble during violent maneuvers, requiring manual resets that cost precious seconds.

The four round clips, while fast to load, ended up scattering or cooking off in fires.

And the exposed ready service lockers posed a secondary explosion risk when a ship was hit.

Heavy seas sometimes flooded the lower mounts on destroyers, requiring crews to clear water from the mechanisms.

The most serious limitation was range.

Against high altitude bombers beyond 10,000 ft, the bow force lost effectiveness.

Japanese forces adapted by attempting very low-level or very high altitude attacks, aiming to stay out of the mid-range kill zone where the bowforce reigned supreme.

Despite these tactical adjustments, post-war interrogations revealed that pilots genuinely feared the quad mounts, identifying them as priority threats.

By August 1945, the US Navy had installed Bow Force guns on every class of combatant from PT boats to battleships like USS Missouri BB63, which mounted 20 quad mounts, creating a formidable point defense capability.

Production had reached industrial scale with thousands of twin and quad mounts delivered to the Navy and Army defending assets across the Pacific.

The weapon remained standard issue through the Korean War, providing anti-aircraft coverage for the Inchan landings and continued in frontline service until the late 1950s when missiles began replacing gun-based air defense.

The Navy retained Bowfor’s installations on many ships through the 1960s as backup systems and some patrol craft carried them into the Vietnam War.

The design proved so successful it became the NATO standard 40mm gun adopted by over 18 navies.

Today preserved Bow Force mounts stand as artifacts aboard museum ships including the USS North Carolina and USS New Jersey.

Their barrels pointed skyward silent monuments to the gun crews who man them under fire.

Modern naval historians consistently rank the bow force among the war’s most successful weapon systems.

Where chapter 1 described ships helpless against determined air attack, the bow force provided the solution.

It was a weapon heavy enough to kill with every hit, fast enough to track modern aircraft, reliable enough for sustained combat, and simple enough for hastily trained crews to operate effectively under the stress of battle, ultimately saving countless ships and sailors lives across three years of brutal Pacific warfare.