The was the main sea-going component of the

Imperial Japanese Navy The Imperial Japanese Navy (IJN; Kyūjitai: Shinjitai: ' 'Navy of the Greater Japanese Empire', or ''Nippon Kaigun'', 'Japanese Navy') was the navy of the Empire of Japan from 1868 to 1945, Potsdam Declaration, when it was dissolved followin ...

. Until 1933, the Combined Fleet was not a permanent organization, but a temporary force formed for the duration of a conflict or major naval maneuvers from various units normally under separate commands in peacetime.

History

Sino-Japanese War (1894–95)

The Combined Fleet was formally created for the first time on 18 July 1894 by the merger of the Standing Fleet and the Western Fleet. The Standing Fleet (also known as the Readiness Fleet) contained the navy's most modern and combat-capable warships. The Western Fleet was a reserve force consisting primarily of obsolete ships deemed unsuitable for front-line combat operations, but still suitable for commerce protection and coastal defense. Vice-admiral

Itō Sukeyuki Marshal-Admiral Count (20 May 1843 – 16 January 1914) was a Japanese career officer and admiral in the Imperial Japanese Navy in Meiji-period Japan. Biography Born in what is now part of Kagoshima City as the son of a ''samurai'' of the ...

was appointed the first Commander-in-Chief of the Combined FleetFleet''
/ref> for the duration of the

first Sino-Japanese War The First Sino-Japanese War (25 July 189417 April 1895), or the First China–Japan War, was a conflict between the Qing dynasty of China and the Empire of Japan primarily over influence in Joseon, Korea. In Chinese it is commonly known as th ...

against China.

Russo-Japanese War (1904–05)

The Combined Fleet was re-formed during the

Russo-Japanese War The Russo-Japanese War (8 February 1904 – 5 September 1905) was fought between the Russian Empire and the Empire of Japan over rival imperial ambitions in Manchuria and the Korean Empire. The major land battles of the war were fought on the ...

of 1904–05 to provide a unified overall command for the three separate fleets in the Imperial Japanese Navy. The 1st Fleet was the main

battleship A battleship is a large, heavily naval armour, armored warship with a main battery consisting of large naval gun, guns, designed to serve as a capital ship. From their advent in the late 1880s, battleships were among the largest and most form ...

force, which formed the backbone of the navy and was intended to be used in a traditional

line of battle The line of battle or the battle line is a tactic in naval warfare in which a fleet of ships (known as ships of the line) forms a line end to end. The first example of its use as a tactic is disputed—it has been variously claimed for date ...

showdown with an equivalent enemy battleship fleet ('' Kantai Kessen''). The 2nd Fleet was a fast, mobile strike force with

armored cruiser The armored cruiser was a type of warship of the late 19th and early 20th centuries. It was designed like other types of cruisers to operate as a long-range, independent warship, capable of defeating any ship apart from a pre-dreadnought battles ...

s and

protected cruiser Protected cruisers, a type of cruiser of the late 19th century, took their name from the armored deck, which protected vital machine-spaces from fragments released by explosive shells. Protected cruisers notably lacked a belt of armour alon ...

s. The 3rd Fleet was primarily a reserve fleet of obsolete vessels considered too weak for front-line combat service, but which could still be used in the operation to blockade Port Arthur. Admiral

Tōgō Heihachirō , served as a '' gensui'' or admiral of the fleet in the Imperial Japanese Navy and became one of Japan's greatest naval heroes. As Commander-in-Chief of the Combined Fleet during the Russo-Japanese War of 1904–1905, he successfully confine ...

was commander-in-chief of the Combined Fleet during the Russo-Japanese War.

Interwar years

The Combined Fleet was not maintained as a permanent organization, but was temporarily created when necessary during fleet maneuvers or when called for by extraordinary circumstances. Thus, during the period from 1905 to 1924, the Combined Fleet was created only sporadically as the occasion or circumstances dictated, and disbanded immediately afterwards. In 1924, the Imperial Japanese Navy declared in an edict on fleet organization that "for the time being" the Combined Fleet would be a standing organization consisting of the IJN 1st Fleet and IJN 2nd Fleet. As this was not intended to be "permanent" and since the commander of IJN 1st Fleet concurrently directed the Combined Fleet, the Combined Fleet was not given a Headquarters staff of its own. From 1933, with the Mukden Incident and the increasing tension with China, a permanent HQ staff for the Combined Fleet was established. By the late 1930s, it included most of Japan's warships—only the base units, the Special Naval Landing Forces, and the China Area Fleet lay outside the Combined Fleet.

World War II

The Combined Fleet came under direct command of the

Imperial General Headquarters The was part of the Supreme War Council (Japan), Supreme War Council and was established in 1893 to coordinate efforts between the Imperial Japanese Army and Imperial Japanese Navy during wartime. In terms of function, it was approximately equi ...

in 1937. With the start of the

Pacific War The Pacific War, sometimes called the Asia–Pacific War or the Pacific Theatre, was the Theater (warfare), theatre of World War II fought between the Empire of Japan and the Allies of World War II, Allies in East Asia, East and Southeast As ...

with the

attack on Pearl Harbor The attack on Pearl HarborAlso known as the Battle of Pearl Harbor was a surprise military strike by the Empire of Japan on the United States Pacific Fleet at Naval Station Pearl Harbor, its naval base at Pearl Harbor on Oahu, Territory of ...

carried out by Combined Fleet's ''Kido Butai'' ( 1st Air Fleet), the Combined Fleet became almost synonymous with the Imperial Japanese Navy, under the command of admiral

Isoroku Yamamoto was a Marshal Admiral of the Imperial Japanese Navy (IJN) and the commander-in-chief of the Combined Fleet during World War II. He commanded the fleet from 1939 until his death in 1943, overseeing the start of the Pacific War in 1941 and J ...

till April 1943 when he died after his plane was shot-down by

US Army Air Forces The United States Army Air Forces (USAAF or AAF) was the major land-based aerial warfare service component of the United States Army and ''de facto'' aerial warfare service branch of the United States during and immediately after World War II ...

over

Bougainville Island Bougainville Island (; Tok Pisin: ''Bogenvil'') is the main island of the Autonomous Region of Bougainville, which is part of Papua New Guinea. Its land area is . The highest point is Mount Balbi, on the main island, at . The much smaller Buk ...

. It comprised the battleships,

aircraft carrier An aircraft carrier is a warship that serves as a seagoing airbase, equipped with a full-length flight deck and hangar facilities for supporting, arming, deploying and recovering carrier-based aircraft, shipborne aircraft. Typically it is the ...

aircraft An aircraft ( aircraft) is a vehicle that is able to flight, fly by gaining support from the Atmosphere of Earth, air. It counters the force of gravity by using either Buoyancy, static lift or the Lift (force), dynamic lift of an airfoil, or, i ...

, and the components that made up the main fighting strength of the IJN. It was first mobilized on the whole for the

Battle of Midway The Battle of Midway was a major naval battle in the Pacific Ocean theater of World War II, Pacific Theater of World War II that took place on 4–7 June 1942, six months after Japan's attack on Pearl Harbor and one month after the Battle of t ...

. After the devastating carrier losses at Midway and in the

Solomon Islands campaign The Solomon Islands campaign was a major military campaign, campaign of the Pacific War during World War II. The campaign began with the Empire of Japan, Japanese seizure of several areas in the British Solomon Islands and Bougainville Island, B ...

, the navy re-organized into a number of "Area Fleets" for local operational control of various geographic zones. The Combined Fleet then evolved into more of an administrative organization. As the war situation deteriorated for the Japanese and the territories controlled by the "Area Fleets" fell one after another to the

United States Navy The United States Navy (USN) is the naval warfare, maritime military branch, service branch of the United States Department of Defense. It is the world's most powerful navy with the largest Displacement (ship), displacement, at 4.5 millio ...

, the

and the

Imperial Japanese Navy General Staff The was the highest organ within the Imperial Japanese Navy (IJN). In charge of planning and operations, it was headed by an Admiral headquartered in Tokyo. History Created in 1893, the Navy General Staff took over operational (as opposed to a ...

acted to force the American fleet into a "decisive battle" in the

Philippines The Philippines, officially the Republic of the Philippines, is an Archipelagic state, archipelagic country in Southeast Asia. Located in the western Pacific Ocean, it consists of List of islands of the Philippines, 7,641 islands, with a tot ...

per the '' Kantai Kessen'' philosophy. In the resultant

Battle of the Philippine Sea The Battle of the Philippine Sea was a major naval battle of World War II on 19–20 June 1944 that eliminated the Imperial Japanese Navy's ability to conduct large-scale carrier actions. It took place during the United States' amphibious r ...

and the

Battle of Leyte Gulf The Battle of Leyte Gulf () 23–26 October 1944, was the largest naval battle of World War II and by some criteria the largest naval battle in history, with over 200,000 naval personnel involved. By late 1944, Japan possessed fewer capital sh ...

the Japanese fleet was severely depleted. The remnants of the Combined Fleet fled to

Okinawa most commonly refers to: * Okinawa Prefecture, Japan's southernmost prefecture * Okinawa Island, the largest island of Okinawa Prefecture * Okinawa Islands, an island group including Okinawa itself * Okinawa (city), the second largest city in th ...

, but further operations were hindered by lack of fuel and air cover. By the time of the final suicide mission of the battleship ''Yamato'' in

Operation Ten-Go , literally Operation Chrysanthemum Water 1, best known as , literally Operation Heaven, was the last major Empire of Japan, Japanese naval operation in the Pacific War, Pacific Theater of World War II. In April 1945, the , the largest battleshi ...

, the Combined Fleet had ceased to exist as an effective combat force.

Commander-in-Chief (司令長官, ''Shireichōkan'')

Timeline

Chief of Staff (参謀長, ''Sanbōchō'')

Vice Chief of Staff (参謀副長, ''Sanbō fukuchō'')

Footnotes

References

Notes

Books

* *

External links

* *
War II Armed Forces – Orders of Battle and Organizations''Nihon Kaigun
{{IJN Fleets of the Imperial Japanese Navy Military units and formations established in 1894 Military units and formations disestablished in 1945