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Pearl Harbor and the Advent of the Aircraft Carrier, But Can the Carrier Remain Supreme?

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Friends of Padre Steve’s World,

On the morning of December 7th 1941 8 of the 9 Battleships assigned to the US Pacific Fleet were in Pearl Harbor. Seven, the USS California, USS Maryland, USS Oklahoma, USS Tennessee, USS West Virginia, USS Arizona and USS Nevada were moored on Battleship Row. The USS Pennsylvania was in the massive dry dock which she shared with the destroyers USS Cassin and USS Downes. The USS Colorado, a sister ship of Maryland and West Virginia was at the Puget Sound Naval Yard being overhauled.

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USS West Virginia sinking at left and USS Tennessee burning at Pearl Harbor

At the time both the United States Navy and the Japanese Imperial Navy still viewed the Battleships as the heart of the fleet and the essence of naval power. Aircraft Carriers were still viewed as an adjunct and support to the traditional battle line.

Japanese-carriersJapanese Aircraft preparing to launch at Pearl Harbor

Thus as the Japanese Carrier Strike Group, the Kido Butai under the command of Vice Admiral Chūichi Nagumo approached Pearl Harbor and intelligence reports came in indicating that the carriers were not present the Japanese were not overly concerned. The lack of concern was in a sense ironic because the force they assigned to destroy the Battleships of the Pacific Fleet was the carrier strike group, not their battle line. The Kido Butai was the largest carrier strike group assembled until late 1943 when the U.S. Pacific Fleet fielded a larger carrier strike group, something no other country has done since.

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The Kido Butai enroute to Pearl Harbor

Comprised of six carriers, the Akagi, Kaga, Hiryu, Soryu, Shokaku and Zuikaku the force embarked over 300 first line aircraft. The aviators of the air groups aboard the carriers had been training for months to attack Pearl Harbor. Their aircraft had been specially outfitted with Type 91 Model 2 aerial torpedoes designed to run in the shallow waters of Pearl Harbor and Type 99 Model 5 armor piecing bombs modified from battleship shells. These weapons would be employed with a devastating effect on the morning of December 7th 1941.

The three carriers assigned to the Pacific Fleet, the USS Saratoga, USS Lexington and USS Enterprise had been dispatched on missions that took them away from Pearl Harbor that fateful Sunday.

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USS Lexington

The Lexington and Task Force 12 had departed Pearl Harbor on December 5th to ferry 18 SB2U Vindicator Dive Bombers of VSMB-231 to Midway Island. These aircraft would ultimately take part in the Battle of Midway and the sinking of the Japanese Cruiser Mikuma. Saratoga was entering San Diego to embark her air group, and Enterprise which had left Pearl Harbor on November 28th to deliver VMF-211 to Wake Island was due to return to Pearl Harbor on the 7th of December. As such none of these ships were in Pearl Harbor at the time of the attack. Their absence helped save the United States and Allied cause in the Pacific.

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USS Saratoga

The United States had other carriers but all were assigned to the Atlantic Fleet due to the belief that Nazi Germany was a greater threat than Japan. The USS Yorktown was at Norfolk in between deployments in support of the Neutrality Patrol. USS Ranger was returning to Norfolk from a Neutrality patrol, USS Wasp was at Grassy Bay Bermuda and the newly commissioned USS Hornet was training out of Norfolk. The USS Long Island, the first Escort carrier was undergoing operational tests and training out of Norfolk.

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Had any of the three carriers assigned to the Pacific Fleet been in Pearl Harbor on the morning of the Japanese attack the results would have been even more disastrous for the United States. Instead these carriers began operations against the Japanese almost immediately. Carriers based on the East Coast including Hornet, Yorktown and Wasp were transferred to the Pacific. In the perilous months following the Pearl Harbor attack the US carriers took the fight to the Japanese conducting raids against Japanese held islands. In April 1942 the Enterprise and Hornet, the latter with 16 B-25 Mitchell bombers under the command of Colonel Jimmy Doolittle struck Tokyo.

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USS Hornet launching the Doolittle Raiders

The result of that attack resulted in a severe embarrassment and loss of face to the Imperial Navy. the strategic and psychological implications were such that Admiral Isoruku Yamamoto decided to attack Midway Island to force the US fleet and its carriers into a decisive battle. Although the Japanese had lost a good number of aircrew from Shokaku and Zuikaku at the Battle of Coral Sea, while sinking Lexington Yamamoto remained committed to the decisive battle.

That battle was decisive, but not in the way Yamamoto had planned. Akagi, Kaga, Hiryu and Soryu were sunk by aircraft operating from Enterprise, Yorktown and Hornet. Yorktown was lost in the battle bat it was a decisive defeat for the Japanese. From that point, though they still were superior to the U.S. Navy in numbers of Carriers and surface warships, and still maintained a massive number of islands which they had fortified and built airbases on in defiance of treaties they agreed to at the end of the First World War,

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Sinking the Akagi at Midway

In the succeeding months in the vicious battles around the Solomon Islands the remaining US carriers proved decisive. Although Wasp and Hornet were sunk in those battles and both Saratoga and Enterprise were often heavily damaged, they held the line. The carriers that the Japanese missed proved decisive in turning the tide and winning the war.

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Raised from the mud of Pearl Harbor the USS West Virginia in Tokyo Bay

Though Yamamoto did not realize it, the attack on Pearl Harbor signaled the end of the supremacy of the Battleship and the ascendency of the Aircraft Carrier. By 1943 Battleships were regulated to escorting the fast carrier task forces or conducting shore bombardments. The ultimate irony was that the last battleship engagement in history was won by the survivors of the attack on Pearl Harbor. Raised from the mud the West Virginia, Tennessee, California, Maryland and Pennsylvania joined by the USS Mississippi rained destruction on two Japanese task forces attempting to penetrate Leyte Gulf and destroy the US invasion force transports at the Battle of Surigao Strait.

It was a fascinating turn of events. The Japanese dispatched the cream of their carrier air forces to destroy the U.S. Pacific Fleet at Pearl. Harbor, and though they crippled the battleships they failed to destroy the American aircraft carriers, at Pearl Harbor, Coral Sea, Midway, or the Guadalcanal campaign. In the following years the Enterprise and Saratoga, bolstered by the carriers of the Essex Class, and the Light Fleet Carriers of the Independence Class, and helped by the addition of dozens of Escort Carriers, which relieved them of the mundane tasks of convoy escort and amphibious landing support, wreaked havoc on the Imperial Japanese Navy from late 1943 on. The Battles of the Philippine Sea, Leyte Gulf, the raid on Formosa, and the strikes on the Japanese homeland proved the superiority of the carrier force the Japanese missed at Pearl Harbor and failed to destroy in subsequent engagements.

Today, nearly eight decades later there is a question of the relevance of aircraft carriers, even though the United States, Great Britain, China, Russia, India, and other nations continue their development. I have to admit, that with the development of other weapons platforms and technologies, that I do not know the ultimate fate of the aircraft carrier. However, like the Ships of the Line that dominated late 17th, 18th, and early 19th centuries., the Ironclads that dominated the late 19th Century, and the Dreadnaughts that dominated until Pearl Harbor.

Pearl Harbor was 78 years ago. Since then carrier and submarine eclipsed the power of the the battleship. We cannot assume that the era of the aircraft carrier will continue without end. The Japanese discounted the power of the aircraft carrier and submarine, assuming that battleships supported by carriers and submarines would maintain control of the Oceans. They were wrong. Regardless of what weapons system we presume will dominate the future, we also must admit the very real possibility that we could be wrong. Technologies that we have not ever began to imagine, except possibly in the realm of science fiction may change everything we believed possible.

i am neither the prophet nor the son of the prophet, thus my opinion is only that: I believe that the carrier will remain the centerpiece of Naval power and strategy for the next decade, and possibly another, but as a military and Naval historian I cannot predict that they remain so longer than that. Thus the United States Navy, and for that matter all navies begin looking toward and planning for technologies that are either in their infancy or not yet imagined. To ignore that fact would be to ignore history. We do that to our detriment.

Until tomorrow,

Peace,

Padre Steve+

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Filed under History, imperial japan, Military, national security, Navy Ships, News and current events, US Navy, World War II at Sea, world war two in the pacific

From Monitor to Musashi: a Tale of Legendary Warships

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Musashi and Monitor

I have been thinking about two ships this past week. One of these ships was the Japanese Super-Battleship Musashi. The Musashi was one of the two largest battleships ever constructed and her wreck was discovered last week where she sank in the Sibuyan Sea. The other ship was the USS Monitor. The tiny Monitor was progenitor of all the great battleships that followed and 153 years ago Monitor helped propel naval architecture and warfare into a new era when she challenged the CSS Virginia at the Battle of Hampton Roads.

The Monitor was one of three experimental designs chosen by the Navy’s Ironclad board to deal with the Virginia. Her design and construction were remarkable, especially for her day. The ship was entirely experimental, nothing like Monitor had ever been built before, but even so it was less than five months from the date she was ordered until she was commissioned and just a few days more than that before she was in action. I cannot imagine any warship ship new design ever breaking that record.

Her designer was John Ericsson, a Swede. Ericsson was the inventor of the screw propeller and designer of the first U.S. Navy Screw Frigate the USS Princeton. Ericsson had be shunned by the Navy after a rifled cannon, which was not of his design or construction exploded aboard Princeton during a gunnery demonstration which killed the Secretary of the Navy and others. Ericcson was not planning to submit a design but was persuaded to and his design, the Monitor was one of the three designs selected.

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The Officers of Monitor

The Monitor was like nothing ever seen on the ocean. Described by some as a “cheese box on a raft” the small ship had all of her machinery located below the waterline on a completely iron hull that only drew 11 feet of water. She was 179 feet long, had a beam of 41 and a half feet and displaced 987 tons. Her single vibrating lever steam engine powered by two boilers produced 340 horsepower and drove her at a top speed of six knots.

Her hull was protected by armor plate, but the most notable and innovative feature was a heavily armored revolving turret with eight inches of armor, mounted two massive 11 inch Dahlgren smoothbore guns which “could fire a 170-pound shot or 136-pound shell in any direction except straight ahead, where the pilot house sheathed in nine inches of armor was located.” Future ships remedied this defect. Ericcson’s ship was mocked around the navy and by naval designers, but he and it would prove them wrong. The Monitor’s most notable features, full steam propulsion, heavy armor and the revolving turret mounting heavy caliber guns would set the standard to which future battleships would be constructed.

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The Battle of Hampton Roads

Monitor had a brief service life, she fought the Virginia, took part in actions along the James River and sank in a storm off Cape Hatteras North Carolina on December 31st 1861. The British Royal Navy designed an improved monitor with higher freeboard and finally an ocean going turret ship, the HMS Devastation.

Soon, the navies of the world began to build battleships and in 1906 the Royal Navy built the HMS Dreadnought which like Monitor revolutionized warship construction and naval warfare. Navies around the world began building ever larger, faster and more powerful Dreadnoughts culminating the designs of the late 1930s, the German Bismarck class, the American Iowa class, the British Vanguard, and the Japanese Yamato Class. It is the last ships, the Yamato and her sister Musashi that I want to discuss here, not that the others are not interesting or important, but because of the almost mythic status that these ships maintain in the annals of naval history, as well as their tragic end.

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Emperor Hirohito on Musashi in 1943

The Yamato and Musashi were the largest and most heavily armed battleships ever built. Shrouded in secrecy by the Imperial Japanese Navy and Government the ships were designed to offset projected American numerical superiority. Their names were symbolic of Japan’s history. Yamato was named after Yamato Province, the ancestral home of the Yamato People, the dominant native ethnic group in Japan. Musashi was named after Musashi Province in which lays Tokyo Prefecture.  A third ship of the class, Shinano, was named after Shinano Province in central Japan which was the home of the prestigious Taketa Shingen family during the Senguku period.

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The Conning Tower and Bridge of Musashi

The secrecy surrounding their design and construction was unprecedented. Those charged with their design and construction were thoroughly checked out by Japan’s secret police and sworn to an oath of secrecy. The oath sworn by builders of Musashi at the Mitsubishi Heavy Industries Nagasaki Shipyard were sworn to the oath shown below:

I am aware that all work involving the construction of the No. 2 Battleship is vital to national security. I will make utmost effort to maintain the secrecy of the project, and swear that I will leak no information relating to the said battleship, even to relatives and close friends. In the event I violate this oath,  I will submit to the punishment determined by the company and the Navy.  

Security measures around the shipyards where Yamato and Musashi were constructed were immense. At Nagasaki where there was a large foreign business and missionary population where the shipyard was visible from most of the city at hemp screen of 75,000 square meters was constructed to shield the ship from prying eyes and spies.

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Musashi under Construction

When actual preparations for construction were taken in 1937 secret police swept the areas of foreign, especially Chinese workers. Security was increased inside and outside the shipyard, all blueprints accounted for and placed under strict guard while all shipyard workers were photographed with any having knowledge of the plans or supervising the construction sworn to the secrecy oath.

When a top secret blueprint went missing in 1938 at Nagasaki an intense investigation that included the torture of numerous suspects and the jailing of a blueprinter who accidentally swept the document into the trash was sentenced to 3 years in prison.

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Armor and Protection of Yamato Class

Few pictures exist of the ships and Japanese Naval Officers destroyed many of the records of the ships design and construction just prior to the end of the Second World War. Throughout their existence they were a mystery to the American Navy. During the war the U.S. Navy estimated them to carry nine 16” guns and displace between 40,000-57,000 tons. Even the highly regarded Jane’s Fighting Ships listed them at just 45,000 tons.

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Yamato and Musashi together in 1943

Preliminary design work began in 1934 and progressed rapidly following Japan’s withdraw from the League of Nations and renunciation of the Washington and London Naval Treaties and withdraw from the 1936 naval talks in London. The early designs varied in the caliber of guns, size and armor, propulsion systems and endurance. Gun calibers ranged from 16” to 18.1” and a combined diesel-turbine system was considered but rejected in favor of traditional steam turbines.

The final design was for a class of five ships. Each would displace 64,000 tons standard displacement and 72,000 tons at full load. They were 862 feet long with a beam of 127 feet.  They were so large that the docks they were built needed to be expanded and special extra-large launch platforms had to be built.  At Nagasaki the dock at to be expanded by cutting into the hill adjacent to it.

They were armed with nine 18.1 inch guns in triple turrets which could fire a projectile weighing over a ton. The secondary armament consisted of 12 6.1 inch guns mounted in triple turrets formerly mounted on the Mogami Class cruisers when those ships were equipped with 8” guns. Anti-aircraft defense included twelve 5” guns and twenty-four 25mm anti-aircraft guns. During the war two of the 6.1 inch turrets were removed and replaced with twelve more 5” guns and the 25mm battery was raised to 162 guns. Fire control systems were designed in such a way that the ships could engage multiple surface targets at the same time.

The ships were protected by a massive armored belt ranging from 16 inches to 8 inches with 26 inch armor on the face plates of the main gun turrets. The armor was advanced with excellent sloping but had a flaw where the upper and lower belts connected just below the waterline which exposed them to damage from torpedoes.

Photographed just prior to the Battle of Leyte Gulf. Ships are, from left to right Musashi, Yamato, a cruiser and Nagato.

Yamato and Musashi viewed beside Battleship Nagato (foreground) just before the Battle of Leyte Gulf

They were powered by 12 Kampon boilers which powered 4 steam turbines and four three bladed propellers. These developed 150,000 shp and could drive the ship at a top speed of 27 knots.

Construction of Yamato began on November 4th 1937 at Kure Naval Shipyard. Musashi on March 28th 1938. Traditionally such events were large public ceremonies but these were limited to just a few Naval Staff and Shipyard executives.  Yamato was launched on August 8th 1940 and commissioned on December 16th 1941, just 9 days after Pearl Harbor. Musashi was launched on November 8th 1940 and commissioned on August 5th 1942 just two days before the U.S. Marines invaded Guadalcanal and two months after the disaster at the Battle of Midway.

Yamato served as Admiral Yamamoto’s flagship at Midway where she saw no action. The next two years she was and Musashi alternated as fleet flagship and conducted operations with Battleship Division One in operations between Mainland Japan and the major Japanese base at Truk. On December 25th 1943 while escorting a convoy she was torpedoed by the submarine USS Skate and suffered heavy damage which flooded a magazine.  On March 29th while underway Musashi was struck near the bow by a torpedo from the USS Tunny.

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Musashi under attack at the Battle of Sibuyan Sea

Both ships participated in the Battle of the Philippine Sea and were part of Vice Admiral Takeo Kurita’s Central Force in the Battle of Leyte Gulf. Musashi was sunk by U.S. Navy Carrier aircraft from the Third Fleet on October 24th 1944 during the Battle of the Sibuyan Sea. Hit by 17 bombs and 19 torpedoes she sank with the loss of nearly 1100 of her crew of almost 2400 men. The survivors were rescued by destroyers and disembarked at Corregidor. Some were sent by troop transport to Japan but one of the ships was torpedoed and sunk leaving her survivors adrift for 19 hours before rescue. Those who reached Japan were isolated from the population while about half of the survivors remained in the Philippines where 117 of 146 of those assigned to the defense of Manila were killed in action.

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Yamato or Musashi under air Attack

Yamato saw action in the surface engagement on October 25th against the Escort Carriers and Destroyers of Taffy-3 during the Battle off Samar. Her guns helped sink the Escort Carrier USS Gambier Bay but was forced away from the action by torpedo attacks from the valiant destroyers of Taffy-3.

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Yamato under Attack April 7th 1945

By April 1944 Japan’s Navy was decimated and U.S. Naval Forces were raiding Mainland Japan. When the United States landed on Okinawa the Japanese Navy and air force launched wave after wave of Kamikaze attacks on the ships in the waters around the island. Yamato, along with Light Cruiser Yahagi and eight destroyers were designated the Surface Special Attack Force and loaded with a full load of ammunition but only enough fuel for a one way trip got underway on April 6th. The mission was for Yamato to reach Okinawa, beach herself and serve as an “unsinkable” gun battery until she was destroyed. The force was spotted by U.S. Navy flying boats hours after their departure and on April 7th over 400 aircraft launched from Task Groups 58.1 and 58.3. The first wave began its attack at 1230 and by 1400 the ship was mortally wounded. Stuck by at least 8 torpedoes and 11 bombs she was dead in the water and began to capsize at 1405. At 1420 she turned turtle and at 1423 exploded when her forward blew up sending up a mushroom cloud nearly 20,000 feet.  Under 300 of her crew of nearly 2400 were rescued.

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The End: Yamato Explodes

What had begun with the tiny “cheese box on a raft” had culminated in two of the largest warships ever built, designed when naval experts planned for a war where the battleship would rule and aircraft carriers play a supporting role. Instead both never faced enemy battleships in combat and both were destroyed by the weapon that the battleship admirals had discounted. It is somewhat fitting that each was commissioned shortly after the triumphs of Japanese and American Naval air power at Pearl Harbor and Midway. However they have attained an almost mythic status in naval lore and are symbols to many Japanese of the sacrifice and futility of the war. Both of the cities where the ships were constructed were destroyed by Atomic bombs. They are tragic reminders of the cost of war in human lives, suffering, economic cost and destruction.

musashi wreck

Musashi’s wreck was discovered by Microsoft co-founder Paul Allen. He posted the first picture of the ship taken in over seventy years, showing the Chrysanthemum seal on her bow to Twitter. As a devotee of these great ships I was amazed to see this.

In a sense their poetic names and the myth ascribed to them are a tragic requiem to the Japanese Empire and the cost of war. They and their brave sailors were sacrificed when the war was already for all intents and purposes lost. They, especially the Yamato were sacrificed for no military purpose save a convoluted sense of honor. Let us pray that it never happens again.

Peace

Padre Steve+

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Pearl Harbor, the Missing Carriers: USS Enterprise, USS Lexington and USS Saratoga

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On the morning of December 7th 1941 8 of the 9 Battleships assigned to the US Pacific Fleet were in Pearl Harbor. Seven, the USS California, USS Maryland, USS Oklahoma, USS Tennessee, USS West Virginia, USS Arizona and USS Nevada were moored on Battleship Row. The USS Pennsylvania was in the massive dry dock which she shared with the destroyers USS Cassin and USS Downes. The USS Colorado, a sister ship of Maryland and West Virginia was at the Puget Sound Naval Yard being overhauled.

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USS West Virginia sinking at left and USS Tennessee burning at Pearl Harbor

At the time both the United States Navy and the Japanese Imperial Navy still viewed the Battleships as the heart of the fleet and the essence of naval power. Aircraft Carriers were still viewed as an adjunct and support to the traditional battle line.

Japanese-carriersJapanese Aircraft preparing to launch at Pearl Harbor

Thus as the Japanese Carrier Strike Group, the Kido Butai under the command of Vice Admiral Chūichi Nagumo approached Pearl Harbor and intelligence reports came in indicating that the carriers were not present the Japanese were not overly concerned. The lack of concern was in a sense ironic because the force they assigned to destroy the Battleships of the Pacific Fleet was the carrier strike group, not their battle line.

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The Kido Butai enroute to Pearl Harbor

Comprised of six carriers, the Akagi, Kaga, Hiryu, Soryu, Shokaku and Zuikaku the force embarked over 300 first line aircraft. The aviators of the air groups aboard the carriers had been training for months to attack Pearl Harbor. Their aircraft had been specially outfitted with Type 91 Model 2 aerial torpedoes designed to run in the shallow waters of Pearl Harbor and Type 99 Model 5 armor piecing bombs modified from battleship shells. These weapons would be employed with a devastating effect on the morning of December 7th 1941.

The three carriers assigned to the Pacific Fleet, the USS Saratoga, USS Lexington and USS Enterprise had been dispatched on missions that took them away from Pearl Harbor that fateful Sunday.

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USS Lexington

The Lexington and Task Force 12 had departed Pearl Harbor on December 5th to ferry 18 SB2U Vindicator Dive Bombers of VSMB-231 to Midway Island. Saratoga was entering San Diego to embark her air group and Enterprise which had left Pearl Harbor on November 28th to deliver VMF-211 to Wake Island was due to return to Pearl Harbor on the 7th of December. As such none of these ships were in Pearl Harbor at the time of the attack. Their absence helped save the United States and Allied cause in the Pacific.

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USS Saratoga

The United States had other carriers but all were assigned to the Atlantic Fleet due to the belief that Nazi Germany was a greater threat than Japan. The USS Yorktown was at Norfolk in between deployments in support of the Neutrality Patrol. USS Ranger was returning to Norfolk from a patrol, USS Wasp was at Grassy Bay Bermuda and the newly commissioned USS Hornet was training out of Norfolk. The USS Long Island, the first Escort carrier was undergoing operational tests and training out of Norfolk.

cv-6-01USS Enterprise at Midway

Had any of the three carriers assigned to the Pacific Fleet been in Pearl Harbor on the morning of the Japanese attack the results would have been even more disastrous for the United States. Instead the carriers began operations against the Japanese almost immediately. Carriers based on the East Coast including Hornet, Yorktown and Wasp were transferred to the Pacific. In the perilous months following the Pearl Harbor attack the US carriers took the fight to the Japanese conducting raids against Japanese held islands. In April 1942 the Enterprise and Hornet, the latter with 16 B-25 Mitchell bombers under the command of Colonel Jimmy Doolittle struck Tokyo.

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USS Hornet launching the Doolittle Raiders

The result was that Admiral Isoruku Yamamoto decided to attack Midway Island to force the US fleet and its carriers into a decisive battle. Although the Japanese had lost a good number of aircrew from Shokaku and Zuikaku at the Battle of Coral Sea, while sinking the Lexington Yamamoto remained committed to the decisive battle. That battle was decisive, but not in the way Yamamoto had planned. Akagi, Kaga, Hiryu and Soryu were sunk by aircraft operating from Enterprise, Yorktown and Hornet. Yorktown was lost in the battle bat it was a decisive defeat for the Japanese.

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Sinking the Akagi at Midway

In the succeeding months in the vicious battles around the Solomon Islands the remaining US carriers proved decisive. Although Wasp and Hornet were sunk in those battles and both Saratoga and Enterprise often heavily damaged they held the line. The carriers that the Japanese missed proved decisive in turning the tide and winning the war.

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Raised from the mud of Pearl Harbor the USS West Virginia in Tokyo Bay

Though Yamamoto did not realize it the attack on Pearl Harbor signaled the end of the supremacy of the Battleship and the ascendency of the Aircraft Carrier. By 1943 Battleships were regulated to escorting the fast carrier task forces or conducting shore bombardments. The ultimate irony was that the last battleship engagement in history was won by the survivors of the attack on Pearl Harbor. Raised from the mud the West Virginia, Tennessee, California, Maryland and Pennsylvania joined by the USS Mississippi rained destruction on two Japanese task forces attempting to penetrate Leyte Gulf and destroy the US invasion force transports at the Battle of Surigao Strait.

The ironies and intricacies of war. They are amazing.

Peace

Padre Steve+

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Requiem of Empire: The Yamato Class Battleships

Emperor Hirohito on Musashi in 1943

The is a long delayed installment of my series on Battleships. Previous were about the Battleships constructed under conditions of the London Naval Conference.  These have dealt with the British King George V Class, French Dunkerque and Richelieu Classes, Italian Vittorio Vento Class and the American North Carolina and South Dakota ClassesI then wrote an introduction to the Post Treaty Super-Battleships. This article is the first in that series which will include articles on the German Bismarck and Tirpitz, British Vanguard and American Iowa Class.

They were the largest and most heavily armed battleships ever built. Shrouded in secrecy by the Imperial Japanese Navy and Government the ships were designed to offset projected American numerical superiority. Their names were symbolic of Japan’s history. Yamato was named after Yamato Province, the ancestral home of the Yamato People, the dominant native ethnic group in Japan. Musashi was named after Musashi Province in which lays Tokyo Prefecture.  A third ship of the class, Shinano, was named after Shinano Province in central Japan which was the home of the prestigious Taketa Shingen family during the Senguku period.

The Conning Tower and Bridge of Musashi

The secrecy surrounding their design and construction was unprecedented. Those charged with their deign and construction were thoroughly checked out by Japan’s secret police and sworn to an oath of secrecy. The oath sworn by builders of Musashi at the Mitsubishi Heavy Industries  Nagasaki Shipyard were sworn to the oath shown below:

I am aware that all work work involving the construction of the No. 2 Battleship is vital to national security. I will make utmost effort to maintain the  secrecy of the project, and swear that I will leak no information relating to the said battleship, even to relatives and close friends. In the event I violate this oath,  I will submit to the punishment determined by the company and the Navy.  

Yamato during Consrtuction

Security measures around the shipyards where Yamato and Musashi were constructed  were immense. At Nagasaki where there was a large foreign business and missionary population where the shipyard was visible from most of the city at hemp screen of 75,000 square meters was constructed to shield the ship from prying eyes and spies.

Musashi under Construction

When actual preparations for construction were taken in 1937 secret police swept the areas of foreign, especially Chinese workers. Security was increased inside and outside the shipyard, all blueprints accounted for and placed under strict guard while all shipyard workers were photographed with any having knowledge of the plans or supervising the construction sworn to the secrecy oath.

When a top secret blueprint went missing in 1938 at Nagasaki an intense investigation that included the torture of numerous suspects and the jailing of a blueprinter who accidentally swept the document into the trash was sentenced to 3 years in prison.

Armor and Protection of Yamato Class

Few pictures exist of the ships and Japanese Naval Officers destroyed many of the records of the ships design and construction just prior to the end of the Second World War. Throughout their existence they were a mystery to the American Navy. During the war the U.S. Navy estimated them to carry nine 16” guns and displace between 40,000-57,000 tons. Even the highly regarded Jane’s Fighting ships listed them at just 45,000 tons.

Yamato and Musashi together in 1943

Preliminary design work began in 1934 and progressed rapidly following Japan’s withdraw from the League of Nations and renunciation of the Washington and London Naval Treaties and withdraw from the 1936 naval talks in London. The early designs varied in the caliber of guns, size and armor, propulsion systems and endurance. Gun calibers ranged from 16” to 18.1” and a combined diesel-turbine system was considered but rejected in favor of traditional steam turbines.

The final design was for a class of five ships. Each would displace 64,000 tons standard displacement and 72,000 tons at full load. They were 862 feet long with a beam of 127 feet.  They were so large that the docks they were built needed to be expanded and special extra large launch platforms had to be built.  At Nagasaki the dock at to be expanded by cutting into the hill adjacent to it.

They were armed with nine 18.1 inch guns in triple turrets which could fire a projectile weighing over a ton. The secondary armament consisted of 12 6.1 inch guns mounted in triple turrets formerly mounted on the Mogami Class cruisers when those ships were equipped with 8” guns. Anti-aircraft defense included twelve 5” guns and twenty-four 25mm anti-aircraft guns. During the war two of the 6.1 inch turrets were removed and replaced with twelve more 5” guns and the 25mm battery was raised to 162 guns. Fire control systems were designed in such a way that the ships could engage multiple surface targets at the same time.

The ships were protected by a massive armored belt ranging from 16 inches to 8 inches with 26 inch armor on the face plates of the main gun turrets. The armor was advanced with excellent sloping but had a flaw where the upper and lower belts connected just below the waterline which exposed them to damage from torpedoes.

Yamato and Musashi viewed beside Battleship Nagato (foreground) just before the Battle of Leyte Gulf

They were powered by 12 Kampon boilers which powered 4 steam turbines and four three bladed propellers. These developed 150,000 shp and could drive the ship at a top speed of 27 knots.

Yamato

Construction of Yamato began on November 4th 1937 at Kure Naval Shipyard. Musashi on March 28th 1938. Traditionally such events were large public ceremonies but these were limited to just a few Naval Staff and Shipyard executives.  Yamato was Launched on August 8th 1940 and commissioned on December 16th 1941, just 9 days after Pearl Harbor. Musashi was launched on November 8th 1940 and commissioned on August 5th 1942 just two days before the U.S. Marines invaded Guadalcanal and two months after the disaster at the Battle of Midway.

Yamato served as Admiral Yamamoto’s flagship at Midway where she saw no action. The next two years she was and Musashi alternated as fleet flagship and conducted operations with Battleship Division One in operations between Mainland Japan and the major Japanese base at Truk. On December 25th 1943 while escorting a convoy she was torpedoed by the submarine USS Skate and suffered heavy damage which flooded a magazine.  On March 29th while underway Musashi was struck near the bow by a torpedo from the USS Tunny.

Musashi Under Attack at the Battle of Sibuyan Sea

Both ships participated in the Battle of the Philippine Sea and were part of Vice Admiral Takeo Kurita’s Central Force in the Battle of Leyte Gulf. Musashi was sunk by U.S. Navy Carrier aircraft from the Third Fleet on October 24th 1944 during the Battle of the Sibuyan Sea. Hit by 17 bombs and 19 torpedoes she sank with the loss of nearly 1100 of her crew of almost 2400 men. The survivors were rescued by destroyers and disembarked at Corregidor. Some were sent by troop transport to Japan but one of the ships was torpedoed and sunk leaving her survivors adrift for 19 hours before rescue. Those who reached Japan were isolated from the population while about half of the survivors remained in the Philippines where 117 of 146 of those assigned to the defense of Manila were killed in action.

Yamato or Musashi under air Attack

Yamato saw action in the surface engagement on October 25th against the Escort Carriers and Destroyers of Taffy-3 during the Battle off Samar. Her guns helped sink the Escort Carrier USS Gambier Bay but was forced away from the action by torpedo attacks from the valiant destroyers of Taffy-3.

Yamato under Attack April 7th 1945

By April 1944 Japan’s Navy was decimated and U.S. Naval Forces were raiding Mainland Japan. When the United States landed on Okinawa the Japanese Navy and air force launched wave after wave of Kamikaze attacks on the ships in the waters around the island. Yamato, along with Light Cruiser Yahagi and eight destroyers were designated the Surface Special Attack Force and loaded with a full load of ammunition but only enough fuel for a one way trip got underway on April 6th. The mission was for Yamato to reach Okinawa, beach herself and serve as an “unsinkable” gun battery until she was destroyed. The force was spotted by U.S. Navy flying boats hours after their departure and on April 7th over 400 aircraft launched from Task Groups 58.1 and 58.3. The first wave began its attack at 1230 and by 1400 the ship was mortally wounded. Stuck by at least 8 torpedoes and 11 bombs she was dead in the water and began to capsize at 1405. At 1420 she turned turtle and at 1423 exploded when her forward blew up sending up a mushroom cloud nearly 20,000 feet.  Under 300 of her crew of nearly 2400 were rescued.

The End: Yamato Explodes

The ships were the largest battleships ever built, designed when naval experts planned for a war where the battleship would rule and aircraft carriers play a supporting role. Instead both never faced enemy battleships in combat and both were destroyed by the weapon that the battleship admirals had discounted. It is somewhat fitting that each was commissioned shortly after the triumphs of Japanese and American Naval air power at Pearl Harbor and Midway. However they have attained an almost mythic status in naval lore and are symbols to many Japanese of the sacrifice and futility of the war. Both of the cities where the ships were constructed were destroyed by Atomic bombs. They are tragic reminders of the cost of war in human lives, suffering, economic cost and destruction.

In a sense their poetic names and the myth ascribed to them are a tragic requiem to the Japanese Empire and the cost of war. They and their brave sailors were sacrificed when the war was already for all intents and purposes lost. They, especially the Yamato were sacrificed for no military purpose save a convoluted sense of honor.

Let us pray that it never happens again.

Peace

Padre Steve+

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Filed under Military, Navy Ships, world war two in the pacific