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Compounding Disaster: The Loss of the Mikuma at Midway

Mikuma as Built

Admiral Isoroku Yamamoto was still attempting to digest the calamity that had befallen Admiral Nagumo’s carrier task force. In the shocked atmosphere of the mighty Super Battleship Yamato’s command center the Staff of the Combined Fleet was hastily attempting to arrive at a solution which might reverse the disaster and bring victory.  Admiral Ugaki, Yamamoto’s Chief of Staff despite his personal doubts ordered Vice Admiral Nobutake Kondo to prepare for a night surface engagement with the US Fleet and to dispatch a strong surface force to bombard Midway in order to prevent the Americans from reinforcing it and to prevent its further use against his forces should the invasion move forward.  Kondo organized his fleet to attempt to find the American carriers and bring them to battle before dawn.

SBD Dauntless Dive Bombers from Hornet attacking Mogami and Mikuma 

Kondo detached Vice Admiral Takeo Kurita’s Close Support Group composed of Cruiser Seven, the fastest and most modern cruisers in the Imperial Navy proceed at full speed to attack Midway.  Kurita’s cruisers, the Kumano, Suzuya, Mikuma and Mogami were each armed with 10 8” guns and were escorted by the two destroyers.

Kurita’s force was 80 miles from Midway when Yamamoto realizing that his plan was unrealistic ordered Kondo’s forces to retreat and rendezvous with his main force shortly after midnight. The order was met with a measure of relief by most officers in the force and the force turned northwest and steamed at 28 knots to meet the Main Body.  At 0215 lookouts on Kumano sighted a submarine on the surface which turned out to be the USS Tambor which had been shadowing the group, and made a signal for the force to make a emergency 45 degree turn to port.

During the process Mogami’s Navigator took over from the watch to oversee the tricky maneuver. In doing so he thought that there was too much distance between him and the ship ahead, the Mikuma. So he adjusted his course to starboard and then realized his mistake. The ship he thought was Mikuma was actually Suzuya and Mikuma was directly ahead. As soon as he recognized his mistake Mogami’s Navigator ordered a hard turn to port and reversed the engines but it was too late. Mogami’s bow crashed into Mikuma’s port quarter. The impact caused minimal damage to Mikuma but Mogami was heavily damaged. She lost 40 feet of her bow and everything else was bent back to port at right angles to her number one turret.

Ariel Photo of Mikuma damaged

Mogami’s damage control teams isolated the damage and worked the ship up to 12 knots. This was not fast enough for Kurita to make his rendezvous so he left Mikuma and the destroyers to escort Mogami while he steamed ahead with Kumano and Suzuya.

Mikuma adrift and sinking. The wreckage of Captain Fleming’s Vindicator can be seen on X- Turret 

Tambor’s skipper LCDR John W Murphy sent a contact report at 0300 reporting “many unidentified ships.” He followed this with more detailed information and the Americans on Midway began to launch its remaining serviceable aircraft to attack the threat. A flight of B-17 Bombers launched at 0430 could not find the Japanese ships but at 0630 a PBY Catalina found the Japanese and radioed Midway “two Japanese battleships streaming oil.”  The remaining 12 aircraft of VSMB-241 under command of Captain Marshall Tyler a mix of SBD Dauntless and SB2U Vindicators took off at 0700. His force attacked at 0808 scoring no hits but Captain Richard Fleming, his Vindicator on fire dropped his bomb and then crashed his aircraft into Mikuma’s after turret. The fire was sucked down air intakes into the starboard engine room with disastrous results. The engineers were suffocated by the smoke and fumes and Mikuma was greatly reduced in speed.

Close up shot of Mikuma with survivors visible 

The two ships limped northwest at 12 knots escorted by the destroyers and were unmolested through much of the day with the exception of an ineffective attack by the B-17s at 0830. The following morning the Dive Bombers of Enterprise and Hornet were at work and found the crippled Japanese ships. Waves over US Dive Bombers attacked the cruisers throughout the morning and into the afternoon. Mikuma was hit at least 5 times and secondary explosions of ammunition and torpedoes doomed the ship. Mogami was also heavily damaged but remained afloat while both destroyers received bomb damage.  At sunset the tough cruiser rolled over to port and sank into the Pacific. Mogami whose damage control teams had performed miracles to keep their ship afloat helped the destroyers rescue survivors from Mikuma.  Only 240 were rescued with 650 officers and sailors going down with the ship.

The action against the cruisers ended the combat operations at Midway. The Japanese ships were doomed by Yamamoto’s decision to try to salvage victory from defeat and the error of Mogami’s Navigator during the emergency turn when Kumano sighted Tambor. The only thing that kept the result from being total was the efficacy of Mogami’s damage control teams.  Mogami was out of the war for 10 months following repairs and conversion to an Aircraft Cruiser in which her aft turrets were removed to increase the number of float plane scouts that the ship could carry. She rejoined the fleet in April 1943 and was sunk following the Battle of the Surigao Strait on 25 October 1944.

The Mogami and Mikuma proved to be tough ships to sink. Unprotected by friendly aircraft they fought hard against the unopposed American Dive Bombers. They suffered massive damage from 500 and 1000 pound bombs, both direct hits and near misses. Mogami was saved by the skill of her damage control teams and the foresight of her Damage Control Officer to jettison her torpedoes so that they did not explode and compound the damage wrought by the American bombs.

For the Americans it was a fitting end to the Battle of Midway and revenge for the Battle of the Sunda Strait where Mikuma and Mogami sank the USS Houston.

Peace

Padre Steve+

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The Great Marianas Turkey Shoot

U.S. Navy personnel observe the Air Battle from a Carrier

The Battle of the Philippine Sea of 19-20 June 1944 was the largest carrier battle in history.  Twenty four aircraft carriers, 15 American and 9 Japanese embarking over 1400 aircraft dueled in the Central Pacific in a battle that so decimated Japanese Naval Aviation that it never recovered. The battle and the subsequent fall of Saipan brought down the government of General Tojo and was the beginning of the collapse of the Japanese Empire and the “Greater Asia Co-Prosperity Sphere.”  

http://dsc.discovery.com/videos/destroyed-in-seconds-marianas-turkey-shoot.html

In late 1943 the Japanese realized that they needed to recover the initiative in the Pacific.  Between the Battle of the Coral Sea and the Battle of Santa Cruz Japanese Naval aviation suffered crippling losses especially among the elite pilots and aircrews with who they had begun the war.  These losses were compounded when the Navy attempted to support the operations of the Army to defend the Solomons and New Guinea.  Squadrons sent to battle the United States Navy, Marine Corps and Army Air Corps suffered at the hands of the every more skilled and well equipped American fighter squadrons the victims of which included Admiral Isoruku Yamamoto the Commander of the Combined Fleet when the Betty bomber that he was traveling on was ambushed by U.S. Army Air Corps P-38 Lightening fighters.

Vice Admiral Jisaburō Ozawa

By late 1943 the Japanese were attempting to train new pilots and aircrews to man the carriers of the Combined Fleet’s Carrier Striking Forces.  Admiral Soemu Toyoda, the new commander of the Combined Fleet and its third commander in less than a year developed “Plan A-Go” as a means to mass carrier and land based aviation assets to defeat the Fast Carrier Task Forces of the United States Navy.  The rebuilt Carrier Striking Groups built around 9 carriers embarking 473 aircraft was commanded by Vice Admiral Jisaburō Ozawa who had taken over from Vice Admiral Chuichi Nagumo.

D4Y3 “Judy” Dive Bomber

The Japanese discerned the intentions of the Americans when American Carrier aircraft struck Saipan and Guam. The Japanese had expected the Americans to strike further south and the Marianas had few land-based aircraft in the area. Toyoda made the decision to engage the Americans and ordered the fleet to attack. American submarines discovered the gathering Japanese forces. The Japanese forces were assembled by the 17th and by the 18th the 5th Fleet under the command of Admiral Raymond Spruance spearheaded by Task Force 58 Commanded by Vice Admiral Marc Mitscher had assembled west of Saipan to meet the Japanese.  The Americans fielded 15 carriers including 9 Fleet Carriers of which 6 were the new Essex Class Fleet Carriers which embarked 956 aircraft.

The F6F Hellcat cemented its place as the premier fighter plane of the Pacific war during the “Turkey Shoot”

The Americans held both a quantitative and qualitative advantage against the Japanese. The American fighter squadrons were equipped with the F6F Hellcat which was far superior to the now obsolescent Japanese Zero fighters and their pilots and aircrews were now more experienced and proficient than the newly minted Japanese aviators who by and large had little combat experience and were flying inferior aircraft.  The Japanese had not planned for a long war and had done little to systemically address the heavy losses that their force experienced during 1942 and 1943 at Coral Sea, Midway, Eastern Solomons, Santa Cruz and in the Solomons campaign.

Vice Admiral Marc Mitscher aboard the USS Lexington

Mitscher desired to move aggressively against the Japanese. However he was overruled by Spruance who acting on the advice of his Battle Line Commander Vice Admiral Willis Lee decided that a possible night surface action with the Japanese was not desirable. Spruance instead directed Mitscher to be ready to defend against Japanese air strikes knowing that his carriers and carrier based air groups was more than a match for the Japanese air groups.   Spruance has been criticized for his decision but the words of Willis Lee, a veteran of the Naval Battle of Guadalcanal where he defeated a Japanese force sinking the Battleship Kirishima.  He prevailed in his flagship the USS Washington but losing three of four escorting destroyers and seeing his second battle wagon the USS South Dakota heavily damaged. A night surface engagement was not worth the risk as in Lee’s eyes it evened the playing field for the Japanese and took away the American air power advantages.

A Japanese aircraft goes down in flames

The Japanese began the action on the 19th sending successive attack waves against Task Force 58. They were met by massed formations of Hellcats vectored in by air controllers in the Combat Information Centers of the American carriers using their superior air search radar systems.  In less than two hours well over 200 Japanese aircraft were downed by the Hellcats.  Lieutenant Alexander Vraicu shot down 6 “Judy” dive bombers in minutes before low on fuel he returned to the USS Lexington.

Lieutenant Alexander Vraicu holds up six fingers on board the USS Lexington

While the Hellcats were chewing up the Japanese squadrons the American submarines USS Albacore and USS Cavalla each sank a Japanese Fleet Aircraft Carrier.  The Albacore hit the Ozawa’s flagship, the new Tiaho with a torpedo which caused minimal damage, but ruptured fuel lines. The Japanese damage control officer opened vents in the ship which allowed the fumes to spread throughout the carrier. They were ignited by a generator causing massive explosions and forcing Ozawa to abandon his flagship. Tiaho would sink by late afternoon after being ripped apart by a series of massive explosions taking with her 1650 of 1750 officers and crew. Cavalla hit the Pearl Harbor veteran Shokaku with a spread of three torpedoes causing that ship to burst into flames with aircraft and ordnance adding to the conflagration. A massive explosion ripped through the ship causing her to sink with a loss of over 1200 officers and crew.

The Japanese flagship Tiaho and her killer the USS Albacore

Toyoda desired that Ozawa retire from the battle before he suffered more losses but Ozawa wanted to stay around and hit the Americans with everything that he had left. The Americans sailed west during the night to seek out the Japanese Fleet. It took the majority of the day to find the Japanese. With only 75 minutes of daylight remaining Mitscher launched a strike despite the risk to his aircrew the majority whom were not trained in night landings.  The American strike sank the carrier Hiyo and two tankers and damaged the carriers Zuikaku, Chitoyda and Junyo as well as the battleship Haruna.  By the end of the day Ozawa had 35 aircraft in flyable condition.

The Japanese Fleet under attack, carrier Zuikaku and two destroyers on June 20th

The final part of the drama was the return of the American strike group to the carriers. Knowing that if he maintained darken ship he would lose many aircraft and the men that flew them Mitscher ordered that the fleet turn on its lights. This act though incredibly risky helped bring the majority of the aircraft to land or ditch near the task force.  The Americans lost less than 100 aircraft many due to the night landings and many of the aircrew were rescued. The Japanese also lost nearly 200 land based aircraft.

Admiral Raymond Spruance

The battle was the death-kneel of Japanese Naval Aviation. Later in the year the carriers again under Ozawa sailed against the Americans only this time they were a decoy force at the Battle of Leyte Gulf, a role that they succeeded in admirably. The American carriers now had free run of the Pacific only opposed by land based aircraft many used in a Kamikaze role until the end of the war. These would cause fearful losses among the American ships heavily damaging a number of carriers.

The battle is often forgotten by due to its proximity to the Normandy landings but was a significant step in the fight against Japan. The islands captured by the Americans, Saipan, Tinian and Guam would provide major sea and air staging areas for the final assault against Japan. Tinian would become the base of many Army Air Corps B-29 “Superfortress” bombers including those that dropped the Atomic bombs less than 14 months later. It was a turning point both militarily and politically. With the fall of the Tojo government the Japanese leaders began to slowly tell the truth about wartime setbacks and losses to a people that it had lied to since their invasion of China and occupation of Mongolia.  It was a setback that even Tojo and the highest leadership of Japan knew that they could not recover.

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An Invincible Fleet and a Flawed Plan: The Japanese at Midway

Note: This is the first of a series of articles coming over the next few days about the Battle of Midway, a major turning point of the Second World War.

The Battleship Yamato, Flagship of the Combined Fleet and symbol of Japanese Naval Power

The Imperial Japanese Navy under the command of Admiral Isoruku Yamamoto had been humiliated. On April 18th 1942 16 B-25 bombers under the command of Colonel Jimmy Doolittle were launched from the deck of the USS Hornet and bombed Tokyo.  Though the physical damage was insignificant the psychological impact was massive on the Japanese military establishment. Yamamoto and his deputy Rear Admiral Matome Ugaki had explored the possibility of attacking Midway in the early months of 1942 as the Japanese armed forces competed with each other to determine an overall strategy for the war effort. The Army was insistent on a China strategy while the Navy preferred expansion in the Western, South and Central Pacific.  Yamamoto’s idea envisioned seizing Midway and using it as a forward base from which an invasion of Hawaii could be mounted as well as the bait to draw the carrier task forces of the U.S. Navy into battle and destroy them.

Admiral Isoruku Yamamoto, CinC Combined Fleet

The Japanese certainly had the forces to accomplish the mission outnumbering the U.S. Navy which had taken heavy losses at Pearl Harbor and in the Far East.  Following the Doolittle raid Yamamoto went ahead with the plan to invade Midway. The operation, named MI was coupled with an invasion of the islands of Attu and Kiska in the Aleutians which would form a picket line to prevent future attacks on the Japanese mainland. Fuchida

Yamamoto’s plan was not without its critics, the majority of the Staf of the First Air Fleet embarked on the First Carrier Striking Force was not in favor including the leader of the Pearl Harbor attack Commander Mitsuo Fuchida who considered it “grammar school strategy.”   Despite objections from them as well as his Fleet Operations Officer Yamamoto directed that the plan be implemented.  The plan was to have the First Carrier Striking Force attack Midway and reduce its defenses so that the Invasion Force could undertake the task of invading and occupying Midway.  Supporting these forces was the Main Body built around Battleship Division One included Yamamoto’s flagship the 72,000 ton behemoth Yamato.  Another strong force was assigned to the Aleutian operation. The task forces were spread out across the North Pacific and would not able to provide mutual support to each other in a timely manner.

Japanese Forces were organized in the following manner.

Main Body, Admiral Yamamoto

BatDiv 1, Admiral Yamamoto

BB Yamato (flagship, Yamato), Captain

BB Nagato (Nagato), Captain Hideo Yano

BB Mutsu (Nagato), Captain Teijiro Yamazumi

Carrier Group, Captain Kaoru Umetani

CVL Hosho (Hosho), Captain Umetani

Air Unit (8 bombers), Lieutenant Yoshiaki Irikiin

DD Yukaze (Minekaze), Lieutenant Commander Shizuka Kajimoto

Special Force, Captain Kaku Harada

Chiyoda (seaplane carrier, Chitose), Captain Harada

Nisshin (seaplane carrier, Nisshin), Captain Katsumi Komazawa

Screen (DesRon 3), RADM Shintaro Hashimoto

CL Sendai (flagship, Jintsu), Captain Nobue Morishita

DesDiv 11, Captain Kiichiro Shoji

DD Fubuki (Fubuki), Captain Shizuo Yamashita

DD Shirayuki (Fubuki), Captain Taro Sugahara

DD Hatsuyuki (Fubuki), Captain Lieutenant Commander Junnari Kamiura

DD Murakumo (Fubuki), Captain Commander Hideo Higashi

DesDiv 19, Captain Ranji Oe

DD Isonami (Fubuki), Commander Ryokichi Sugama

DD Uranami (Fubuki), Commander Tsutomu Hagio

DD Shikinami (Fubuki), Commander Akifumi Kawahashi

DD Ayanami (Fubuki), Commander Eiji Sakuma

1st Supply Unit, Captain Shigeyasu Nishioka

Naruto (Oiler), Captain Nishioka

Toei Maru (Oiler)

It was Yamamoto’s plan to use this force to polish off U.S. Forces that would only enter the fight after he had taken Midway. Despite the success of his carrier task forces at his heart Yamamoto was still a Battleship Sailor and believed that his battleships would be the deciding factor in the final destruction of the U.S. Navy forces in the Pacific.  This force could be augmented by the Aleutian Guard Force, detached from the Main Body under the command of Vice Admiral Shiru Takasu and was composed of the following fleet units:

GUARD (Aleutians Screening) FORCE, VADM Shiro Takasu in Hyuga

Chief of Staff, Rear Admiral Kengo Kobayashi

BatDiv 2

BB Hyuga (flagship, Hyuga), Captain Chiaki Matsuda

BB Ise (Hyuga), Captain Isamu Takeda

BB Fuso (Fuso), Captain Mitsuo Kinoshita

BB Yamashiro (Fuso), Captain Gunji Kogure

Screen, RADM Fukuji Kishi

CruDiv 9, Rear Admiral Kishi

CL Kitakami ( flagship, Kuma), Captain Saiji Norimitsu

CL Oi (Kuma), Captain Shigeru Narita

DesDiv 20, Captain Yuji Yamada

DD Asagiri (Fubuki), Commander Nisaburo Maekawa

DD Yugiri (Fubuki), Captain Masayoshi Motokura

DD Shirakumo (Fubuki), Commander Toyoji Hitomi

DD Amagiri (Fubuki), Captain Buichi Ashida

DesDiv 24, Captain Yasuji Hirai

DD Umikaze (Shiratsuyu), Commander Nagahide Sugitani

DD Yamakaze (Shiratsuyu), Commander Shuichi Hamanaka

DD Kawakaze (Shiratsuyu), Commander Kazuo Wakabayashi

DD Suzukaze (Shiratsuyu), Commander Kazuo Shibayama

DesDiv 27, Captain Matake Yoshimura

DD Ariake (Hatsuharu), Commander Shoichi Yoshida

DD Yugure (Hatsuharu), Commander Kiyoshi Kamo

DD Shigure (Shiratsuyu), Commander Noboru Seo

DD Shiratsuyu (Shiratsuyu), Lieutenant Commander Kimmatsu Hashimoto

2nd Supply Unit, Captain Matsuo Eguchi

San Clemente Maru (oiler), Captain Eguchi

Toa Maru (oiler)

The force that was the true heart of the Japanese Navy in early 1942 was the First Carrier Striking Force which at Pearl Harbor and in the months following had run roughshod over all Allied opposition.  Initially composed of 6 flattops the force was reduced to four when the Shokaku was heavily damaged and Zuikaku’s air group decimated at the Battle of the Coral Sea on 8 May 1942.  Nevertheless it was still a formidable and experienced force in its own right.  Commanded by Vice Admiral Chuichi Nagumo it was composed of the following units:

FIRST CARRIER STRIKING FORCE (1st Air Fleet), VADM Chuichi Nagumo

Carrier Group, VADM Nagumo

CarDiv 1

CV Akagi  (flagship, Akagi) 21 Zero fighters, 21 dive bombers, 21 torpedo bombers

CV Kaga (Kaga) 21 Zero fighters, 21 dive bombers, 30 torpedo bombers

CarDiv 2 – RADM Tamon Yamaguchi

CV Hiryu (flagship, Hiryu) 21 Zero fighters, 21 dive bombers, 21 torpedo bombers

CV Soryu (Hiryu) 21 Zero fighters, 21 dive bombers, 21 torpedo bombers

Support Group – RADM Hiroaki Abe CruDiv 8

CA Tone (flagship, Tone)

CA Chikuma (Tone)

2nd Section, BatDiv 3 –

BB Haruna (Kongo)

BB Kirishima (Kongo)

Screen (DesRon 10) – RADM Susumu Kimura

CL Nagara (flagship, Nagara)

DesDiv 4 – 4 DDs

DesDiv 10 – 3 DDs

DesDiv 17 – 4 DDs

Supply Group – 5 oilers, 1 DD

The Invasion Force under the command of Vice Admiral Nobutake Kondo was a formidable surface strike group in its own right and was built around 2 Fast Battleships, 9 Heavy Cruisers and a light carrier.

MIDWAY INVASION FORCE, (2nd Fleet), VADM Nobutake Kondo

Invasion Force Main Body

CruDiv 4 (less 2nd section)

CA Atago (flagship, Takao),

CA Chokai (Takao)

CruDiv 5 (less 2nd section)

CA Myoko (Myoko)

CA Haguro (Myoko)

BatDiv 3 (less 2nd section) –

BB Kongo (Kongo)

BB Hiei (Kongo)

Screen (DesRon 4) – RADM Shoji Nishimura

CL Yura (flagship, Nagara)

DesDiv 2 – 4 DDs

DesDiv 9 – 3 DDs

Carrier Group Zuiho (CVL) — 12 Zero fighters, 12 torpedo bombers; 1 DD

Supply Group – 4 oilers, 1 repair ship

Close Support Group – VADM Takeo Kurita

CruDiv 7

CA Kumano (flagship, Mogami)

CA Suzuya (Mogami)

CA Mikuma (Mogami)

CA Mogami (Mogami)

DesDiv 8 – 2 DDs 1 oiler

Transport Group – RADM Raizo Tanaka

12 transports carrying troops

3 patrol boats carrying troops

1 oiler

Escort (DesRon 2) – RADM Tanaka

CL Jintsu (flagship, Jintsu)

DesDiv 15 – 2 DDs

DesDiv 16 – 4 DDs

DesDiv 18 – 4 DDs

Seaplane Tender Group – RADM Riutaro Fujita

Seaplane Tender Div 11

Chitose (CVS) — 16 fighter seaplanes, 4 scout planes

Kamikawa Maru (AV) — 8 fighter seaplanes, 4 scout planes

1 DD;

1 patrol boat carrying troops

Minesweeper Group

4 minesweepers

3 submarine chasers

1 supply ship

2 cargo ships

The Northern Force which was assigned to the invasion and occupation of Attu and Kiska was commanded by Vice Admiral Moshiru Hosogaya included the carriers Ryujo and Junyo which had they accompanied the First Carrier Striking Force might have given the Japanese the edge that they would have needed to recover when that force was destroyed on June 4th.  This force was composed of the following units:

NORTHERN (Aleutians) FORCE (5th Fleet) — VADM Moshiro Hosogaya

Northern Force Main Body

CA Nachi (flagship, Myoko)

Screen –

2 DDs

Supply Group –

2 oilers, 3 cargo ships

Second Carrier Striking Force — RADM Kakuji Kakuta

Carrier Group (CarDiv 4)

CVL Ryujo (flagship, Ryujo) — 16 Zero fighters, 21 torpedo bombers

CV Junyo (Junyo) — 24 Zero fighters, 21 torpedo bombers

Support Group (2nd section, CruDiv 4) –

CA Maya (Takao)

CA Takao (Takao)

Screen (DesDiv 7) –

3 DDs

1 oiler

Attu Invasion Force — RADM Sentaro Omori

CL Abukuma (flagship, Nagara)

DesDiv 21 –

4 DDs

1 minelayer

1 transport carrying troops

Kiska Invasion Force — Capt. Takeji Ono

CruDiv 21 –

CL Kiso

CL Tama 

AMC Asaka Maru (auxiliary cruiser)

Screen (DesDiv 6) –

3 DDs

2 transports carrying troops

Minesweeper Div. 13 –

3 minesweepers

Submarine Detachment — RADM Shigeaki Yamazaki

SubRon 1 – I-9 (flagship)

SubDiv 2 — 3 submarines

SubDiv 4 — 2 submarines

Note all Japanese Fleet information obtained online at http://www.microworks.net/pacific/orders_of_battle/midway_japan.htm

These forces were augmented by a submarine screening force and land based naval air forces stationed at Wake and Kwajalein.

The plan was complicated and depended on the Americans reacting exactly as the plan anticipated them doing.  Yamamoto never expected that the Americans would be waiting for his forces and had knowledge of his plans due to the efforts of U.S. Navy code breakers under the direction of Commander Joseph Rochefort and the Fleet Intelligence Officer Captain Edwin Layton had broken the top secret Japanese Navy JN-25 Code.  Thus despite the massive amount of forces involved the plan was seriously flawed and left the advanced forces vulnerable to unexpected American moves.

Next: Calculated Risk: The American Forces and Strategy at Midway

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