Operation Iron Lantern

[jetjockey]

Operation Iron Lantern

Mission Objective:
Seize Corregidor before any meaningful reinforcement from Clark Field can arrive, while minimizing naval losses to mines and coastal artillery.

Background:
In December 1941, all Allied land forces on Luzon were ordered to withdraw into the developing fortress complex at Clark Field. Nearly 120,000 men were eventually concentrated there, and by January the position had grown strong enough to resist any direct assault. Even with the arrival of the Hong Kong assault forces, Japanese losses proved ruinous.
Reconnaissance, however, revealed a critical vulnerability: Bataan was held by fewer than 12,000 men. This discovery transformed the strategic picture. If Corregidor could be isolated and taken quickly, the entire Luzon fortress system would unravel. By mid‑February, Operation Iron Lantern was conceived.

Synopsis:
To execute the assault, the 9th Infantry Division was activated from the Manchukuo Garrison, while the veteran 48th Infantry Division was withdrawn from the siege lines at Clark Field. These two divisions, supported by five engineer regiments, were tasked with storming the beaches at Bataan and reducing the island fortress.

Battle Plan:
The 1st Amphibious Squadron would embark the 9th Infantry Division at Port Arthur, along with the 27th Electric Engineer Regiment and the 7th and 22nd Independent Engineer Regiments. After passing Takao, the squadron would merge with transports carrying the 48th Infantry Division and the 20th Independent Engineers from Aparri, as well as the 1st Independent Engineer Regiment from Pescadores.
The combined force would then rendezvous with the 2nd, 3rd, and 4th Battleship Divisions before advancing toward Bataan. Air cover would be provided by the 2nd Division of the Kido Butai, while four minesweeping task forces would precede the assault to clear the minefields.

Order of Battle:
1st Amphibious Squadron — RADM Nishio aboard Nagato and Fusō, with CS Nisshin, four destroyers, three minesweepers, and numerous escorts.
2nd Battleship Division — RADM Tanaka aboard Mutsu and Yamashiro, with CA Mogami, CL Kitakami, and two destroyers.
3rd Battleship Division — RADM Ichimura aboard Kongō and Haruna, with CAs Takao and Atago, CL Jintsu, and six destroyers.
4th Battleship Division — RADM Hashimoto aboard Ise and Hyūga, with CA Mikuma and three destroyers.
Kido Butai, 2nd Division — RADM Yamaguchi aboard Kaga and Akagi, with CA Furutaka, CL Abukuma, CS Chiyoda, and six destroyers.

If successful, Iron Lantern will collapse the final Allied stronghold on Luzon and free six divisions for operations elsewhere.

The stage is set. The players assemble.

[jetjockey]

**Imperial Japanese Navy
Combined Fleet
Operational Order No. 47**
(Extract — 1st Amphibious Squadron)

Port Arthur, 7 March 1942

1. Situation
Enemy forces on Luzon have withdrawn into the Clark Field fortress complex. Reconnaissance confirms that Bataan Peninsula is held in limited strength and that Corregidor Island remains the key to the defense of Manila Bay. Rapid seizure of Corregidor will isolate Clark Field and hasten the collapse of all organized resistance on Luzon.

2. Mission
The 1st Amphibious Squadron, under the command of Rear Admiral Nishio, will embark designated Army formations at Port Arthur and proceed without delay toward the Luzon area. The Squadron will participate in Operation Iron Lantern, the seizure of Corregidor Island.

3. Forces Assigned
• Flagship: Nagato
• Battleship: Fusō
• Seaplane Tender: Nisshin
• Escort: Four destroyers, four DMS, and attached minor vessels
• Embarked Troops:
• 9th Infantry Division
• 27th Electric Engineer Regiment
• 7th Independent Engineer Regiment
• 22nd Independent Engineer Regiment

4. Execution

1. Departure:
The 1st Amphibious Squadron will depart Port Arthur at 0600 hours, 7 March, and proceed on prescribed routing toward Takao.

2. Rendezvous:
After passing Takao, the Squadron will merge with transports carrying the 48th Infantry Division, the 20th Independent Engineers from Aparri, and the 1st Independent Engineer Regiment from Pescadores.

3. Concentration:
Upon completion of the rendezvous, the Squadron will join with the 2nd, 3rd, and 4th Battleship Divisions in the Luzon approaches.

4. Operations in Objective Area:
The Squadron will advance to the Bataan–Corregidor sector in accordance with Combined Fleet directives.
• Minesweeping units will precede the main body to clear minefields.
• Battleship Divisions will conduct preparatory bombardment as ordered.
• The 1st Amphibious Squadron will land assigned Army forces on beaches designated by 14th Army.

5. Command and Signal
• Command of naval forces in the operation rests with Combined Fleet Headquarters.
• Air cover will be provided by Kido Butai, 2nd Division, under Rear Admiral Yamaguchi.
• Communications will follow standard wartime protocols; radio silence is to be maintained until contact with the enemy is expected.

By order of the Commander-in-Chief, Combined Fleet
Yamamoto Isoroku, Admiral, IJN

[jetjockey]

14th Army Operations Directive — Operation Iron Lantern
(Issued at Clark Field, 15 March 1942)
1. Operational Objective
14th Army will seize Bataan and Corregidor by direct amphibious assault, thereby collapsing the Manila Bay defensive complex and forcing the surrender of all remaining enemy forces on Luzon. The operation bypasses the Clark Field fortress entirely and aims to secure Manila Bay before the enemy can redeploy.

2. Situation
a. Enemy Forces
• All major Allied formations have withdrawn into the Clark Field fortress, estimated at over 120,000 troops.
• Bataan is held by fewer than 12,000 personnel, primarily headquarters, service, and straggler units.
• Corregidor garrison consists of coastal artillery, engineers, and support troops with limited mobility.
• Enemy air and naval forces are negligible.
Enemy intent is assessed as static defense of Clark, with Bataan and Corregidor expected to delay but not maneuver.
b. Friendly Forces
• 48th Infantry Division (reinforced)
• 9th Infantry Division (reinforced)
• Five independent engineer regiments
• 1st Amphibious Squadron (Nagato, Fuso, Nisshin, escorts)
• 2nd–4th Battleship Divisions (Kongo, Haruna, Ise, Hyuga, Yamashiro, Mutsu, heavy cruisers, destroyers)
• Carrier Division 2 (Akagi, Kaga) providing air cover
• Four minesweeping units for mine clearance
Clark Field Siege Group (remains in place):
• 4th Division
• 21st Division
• 38th Division
• 16th Division
• 65th Brigade
These formations will maintain the siege of Clark Field and increase pressure to prevent any breakout or reinforcement toward Bataan.
c. Higher Headquarters
14th Army HQ remains at Clark Field, retaining operational control and coordinating all movements from the fortress perimeter.

3. Area of Operations
The AO includes:
• Bataan Peninsula (primary landing area)
• Corregidor Island (decisive objective)
• North and South Channels of Manila Bay
• Approaches from Clark Field (to be interdicted, not assaulted)

4. Mission
On 17 March, 14th Army will land two reinforced divisions on Bataan, isolate Corregidor, and seize the island by direct amphibious assault. The operation must be completed before the Clark Field garrison can organize a relief effort.

5. Execution
a. Concept of Operations
Operation Iron Lantern proceeds in three phases:
Phase I — Approach, Clearance, and Suppression (15–17 March)
• Minesweeping groups clear minefields in the North Channel and Bataan approaches.
• Battleship divisions conduct systematic bombardment of Corregidor’s coastal guns and Bataan strongpoints.
• Carrier Division 2 maintains air superiority and suppresses any movement from Clark.
• 14th Army HQ at Clark coordinates timing and confirms D‑Day readiness.
Phase II — Landing on Bataan (D‑Day: 17 March)
48th Division lands on northern Bataan; 9th Division lands on central Bataan; engineers land with first waves.
Objective: Secure Bataan within 48 hours.
Phase III — Assault on Corregidor (N.L.T. 20 March)
Battleships neutralize artillery; engineers prepare staging; both divisions conduct a direct amphibious landing on Corregidor’s north shore.

b. Tasks to Subordinate Units
48th Division
• Main effort on northern Bataan.
• Block any enemy movement from Clark.
• Provide artillery support for Corregidor assault.
9th Division
• Secure central Bataan.
• Prepare first-wave assault elements for Corregidor.
• Maintain pressure to prevent enemy consolidation.
Engineer Regiments
• Breach beach defenses.
• Prepare landing zones and crossing points.
• Support Corregidor assault with demolition and bridging assets.
Clark Field Siege Group (4th, 21st, 38th, 16th Divisions; 65th Brigade)
• Maintain full encirclement of Clark Field.
• Increase pressure through bombardment, probing attacks, and interdiction.
• Prevent any breakout toward Bataan or movement to reinforce Corregidor.
Battleship Divisions
• Neutralize Corregidor artillery.
• Provide continuous fire support.
Carrier Division 2
• Maintain air superiority over Manila Bay.
• Interdict any movement from Clark Field.
• Provide reconnaissance of Bataan and Corregidor.

c. Coordinating Instructions
• D‑Day is 17 March.
• Corregidor assault to begin no later than 20 March, weather permitting.
• Clark Field siege forces will intensify pressure throughout Iron Lantern to prevent enemy redeployment.
• No ground assault is to be made against Clark until Corregidor falls.

6. Logistics
• Supply priority to engineers and 48th Division.
• Battleships refuel at Takao/Pescadores as required.
• Medical stations established on northern Bataan within 24 hours of landing.
• All supply convoys escorted by destroyers.

7. Command and Signal
• 14th Army HQ remains at Clark Field throughout the operation.
• Forward liaison teams accompany the amphibious force.
• All phase transitions reported immediately to Clark HQ.
• Commanders may exploit opportunities consistent with Army intent.

Screenshot 2025-12-26 123619.png (35.25 KiB) Viewed 417 times

[jetjockey]

From: Admiral Yamamoto Isoroku, Commander-in-Chief, Combined Fleet
To: Commanders, 2nd, 3rd, and 4th Battleship Divisions
Subject: Completion of Bombardment Mission and Replenishment Orders

Following successful execution of scheduled bombardments against enemy
positions in the Bataan–Corregidor sector, all battleship divisions are
to disengage and commence immediate withdrawal to designated replenishment
ports. Priority is to be placed on full ammunition resupply, refueling,
and restoration of all operational capacities.

Report readiness status upon arrival. Further tasking will be issued
following assessment of fleet condition and operational requirements
for the continuing reduction of Luzon defenses.

Maintain vigilance during withdrawal. Enemy air and submarine activity
remains probable in the approaches.

— Yamamoto, C-in-C Combined Fleet

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Night Naval bombardment of Bataan at 78,77 - Coastal Guns Fire Back!

9 Coastal gun shots fired in defense.

Japanese Ships
BB Haruna
BB Kongo
CA Takao
CL Jintsu
DD Akatsuki
DD Arashio
DD Michishio
DD Oshio
DD Asashio

Allied ground losses:
13 casualties reported
Squads: 0 destroyed, 0 disabled
Non Combat: 0 destroyed, 5 disabled
Engineers: 0 destroyed, 0 disabled

BB Haruna firing at Manila Bay Defenses
Manila Bay Defenses firing at BB Haruna
Manila Bay Defenses firing at BB Kongo
BB Kongo firing at Manila Bay Defenses
CA Takao firing at Manila Bay Defenses
CL Jintsu firing at Manila Bay Defenses
Manila Bay Defenses firing at CL Jintsu
DD Akatsuki firing at Manila Bay Defenses
DD Arashio firing at Manila Bay Defenses
Manila Bay Defenses firing at DD Arashio
DD Michishio firing at Manila Bay Defenses
DD Oshio firing at Manila Bay Defenses
Manila Bay Defenses firing at DD Oshio
DD Asashio firing at Manila Bay Defenses

[jetjockey]

0300, March 17th:

AM1 to All Lantern Units:
Signal KAKU‑3.
Commence landing.

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Amphibious Assault at Bataan (78,77)

TF 178 troops unloading over beach at Bataan, 78,77

Japanese ground losses:
240 casualties reported
Squads: 20 destroyed, 0 disabled
Non Combat: 21 destroyed, 0 disabled
Engineers: 0 destroyed, 0 disabled
Guns lost 5 (5 destroyed, 0 disabled)
Vehicles lost 2 (2 destroyed, 0 disabled)

16 troops of a IJA Engineer Squad lost overboard during unload of 9th Div /3
19 troops of a IJA Infantry Sqd (H) lost in surf during unload of 9th Div /5
19 troops of a IJA Infantry Sqd (H) lost overboard during unload of 9th Div /6
19 troops of a IJA Infantry Sqd (H) lost in surf during unload of 9th Div /6
75mm T94 Mtn Gun lost in surf during unload of 9th Div /6
19 troops of a IJA Infantry Sqd (H) lost in surf during unload of 48th Div
16 troops of a IJA Engineer Squad lost from landing craft during unload of 48th Div /3
19 troops of a IJA Infantry Sqd (H) accidentally lost during unload of 48th Div /4
12 Support troops accidentally lost during unload of 48th Div /5
7.7mm T99 AAMG lost from landing craft during unload of 20th Ind. Engr Rgt
12 Support troops lost in surf during unload of 20th Ind. Engr Rgt /2
19 troops of a IJA Infantry Sqd (H) lost from landing craft during unload of 48th Div /7
19 troops of a IJA Infantry Sqd (H) lost overboard during unload of 48th Div /8
Engineer Vehicle dropped into water during unload of 22nd Ind. Engr Rgt
12 Support troops lost in surf during unload of 48th Div /9
Motorized Support lost from landing craft during unload of 27th Electric Engr Rgt
19 troops of a IJA Infantry Sqd (H) lost from landing craft during unload of 9th Div /7
75mm T94 Mtn Gun lost overboard during unload of 9th Div /7
12 Support troops accidentally lost during unload of 9th Div /7
75mm T94 Mtn Gun lost in surf during unload of 9th Div /8
12 Support troops lost in surf during unload of 9th Div /8
12 Support troops lost from landing craft during unload of 9th Div /8
19 troops of a IJA Infantry Sqd (H) lost from landing craft during unload of 48th Div /10
12 Support troops lost from landing craft during unload of 9th Div /9
12 Support troops lost overboard during unload of 9th Div /9
19 troops of a IJA Infantry Sqd (H) lost from landing craft during unload of 9th Div /10
12 Support troops lost from landing craft during unload of 9th Div /10
12 Support troops accidentally lost during unload of 9th Div /10
19 troops of a IJA Infantry Sqd (H) lost from landing craft during unload of 48th Div /13
12 Support troops lost from landing craft during unload of 48th Div /14
12 Support troops lost in surf during unload of 9th Div /11
12 Support troops lost from landing craft during unload of 9th Div /12
12 Support troops lost overboard during unload of 48th Div /15
12 Support troops accidentally lost during unload of 48th Div /16
12 Support troops lost overboard during unload of 48th Div /17
12 Support troops lost overboard during unload of 48th Div /18
12 Support troops accidentally lost during unload of 48th Div /19
75mm T94 Mtn Gun lost overboard during unload of 48th Div /20
19 troops of a IJA Infantry Sqd (H) lost in surf during unload of 48th Div /21
19 troops of a IJA Infantry Sqd (H) lost overboard during unload of 48th Div /21

[jetjockey]

From: Lt. Gen. Masaharu Nakamura, Commanding Officer, 14th Army
To: Admiral Yamamoto Isoroku, Commander‑in‑Chief, Combined Fleet
Subject: Assault Status Report

Despite severe losses among our minesweeping detachments, the
approach channel has been fully cleared. All assault echelons
completed their landings in good order and are now firmly established
on the designated beaches.

Reorganization is underway. All formations will commence the general
advance at first light on 18 March.

— Nakamura, 14th Army

[jetjockey]

From: Lt. Gen. Masaharu Nakamura, Commanding Officer, 14th Army
To: Admiral Yamamoto Isoroku, Commander‑in‑Chief, Combined Fleet
Subject: Status Report — Corregidor Operation

Corregidor was found to be only lightly held. Following the landing operations, organized resistance collapsed rapidly and the fortress capitulated in short order. Our forces have secured all key positions and are conducting standard consolidation and clearance procedures. With the island now fully in our hands, all formations are ordered to press forward without delay toward Clark Field. Movement begins immediately in accordance with previously issued operational plans. — Nakamura, 14th Army

---

Ground combat at Bataan (78,77)

Japanese Shock attack

Attacking force 31135 troops, 264 guns, 113 vehicles, Assault Value = 990

Defending force 8539 troops, 212 guns, 152 vehicles, Assault Value = 154

Japanese engineers reduce fortifications to 2

Japanese adjusted assault: 1203

Allied adjusted defense: 63

Japanese assault odds: 19 to 1 (fort level 2)

Japanese forces CAPTURE Bataan !!!

Combat modifiers
Defender: terrain(+), forts(+), disruption(-), fatigue(-)
experience(-), supply(-)
Attacker: shock(+)

Japanese ground losses:
798 casualties reported
Squads: 2 destroyed, 44 disabled
Non Combat: 1 destroyed, 8 disabled
Engineers: 2 destroyed, 44 disabled

Allied ground losses:
4271 casualties reported
Squads: 193 destroyed, 0 disabled
Non Combat: 771 destroyed, 0 disabled
Engineers: 20 destroyed, 0 disabled
Guns lost 309 (309 destroyed, 0 disabled)
Vehicles lost 223 (223 destroyed, 0 disabled)
Units destroyed 4

Assaulting units:
48th Division
27th Electric Engineer Regiment
9th Division
20th Ind. Engineer Regiment
1st Ind. Engineer Regiment
7th Ind. Engineer Regiment
22nd Ind. Engineer Regiment

Defending units:
45th PS Infantry Regimental Combat Team
Manila Bay Defenses
Bataan USN Base Force
86th PS Coastal Artillery Battalion

[jetjockey]

# After Action Report — Operation Iron Lantern
14th Army / Combined Fleet Coordination Summary
Date: 18 March 1942

## 1. Operational Overview
Following the clearance of the approach channel—achieved despite severe losses among attached minesweeping units—the assault force reached the designated beaches in good order. Corregidor’s defenses proved lighter than anticipated, and organized resistance collapsed rapidly after initial contact. The fortress capitulated shortly thereafter, allowing the 14th Army to consolidate positions and prepare for the advance inland.

## 2. Naval Losses
The following losses were sustained during minesweeping, approach, and landing operations:

- 13 × DMS — Destroyer Minesweepers lost primarily to concentrated coastal artillery fire during channel‑clearing operations.
- 1 × CL — Light cruiser lost during supporting actions in the bay.
- 3 × xAK Transports — Lost during the landing phase due to coastal gunfire and accumulated damage.

In addition to these total losses, several crippled vessels were able to divert to Manila and are now undergoing repairs. Their survival mitigates the overall impact on fleet readiness and preserves valuable hulls for future operations.

While the losses were significant, they did not compromise the landing timetable or the ability of the assault force to secure its objectives.

## 3. Air Losses
- Negligible.
Enemy air activity remained minimal, and friendly air cover maintained effective suppression throughout the operation.

## 4. Ground Force Status

### 9th Division
> “The 9th Division sustained only light losses—approximately two percent of its combat strength. Casualties and disruption were minor, and the division remains fully fit for continued operations.”

### 48th Division
> “The 48th Division incurred moderate wear, losing just under ten percent of its effective combat power. Forward battalions were engaged heavily, but overall divisional strength remains high, with no loss of operational momentum.”

Both formations retain strong offensive capability and are prepared to continue the advance without delay.

## 5. Current Situation
With Corregidor secured, all formations have been ordered to press forward toward Clark Field in accordance with operational directives. Reorganization is underway, and movement has commenced.

## 6. Assessment
Operation Iron Lantern achieved its primary objectives rapidly and decisively. Despite heavy naval losses during the approach, ground operations proceeded with minimal degradation to assault formations. The swift collapse of Corregidor’s defenses has preserved operational momentum and enabled the 14th Army to transition immediately to the next phase of the Luzon campaign.

[jetjockey]

I hope you enjoyed reading this. Now off to Clark Field...

[LargeSlowTarget]

Interesting. In one of my games I have had a surface TF reacting into Bataan's minefields unintended - no survivors. That taught me to stay away from it. 13 DMS is a steep price because Japan cannot replace them. Maybe converting many small xAKL into sacrificial AMc would be an alternative?

[jetjockey]

Could'a, would'a, should'a.

Lesson learned.

I was more concerned whether it could be done. Next time I am faced with a Fortress Clark Field, Bataan falls earlier.

[CaptBeefheart]

Bataan, Shimonoseki, Tsushima, Singapore... these are all ship graveyards. You have to be very careful in keeping your ships away from these straits when they are under enemy control. In the immortal words of Bill Clinton, "I feel your pain."

Cheers,
CB