The was the main

battleship A battleship is a large armored warship with a main battery consisting of large caliber guns. It dominated naval warfare in the late 19th and early 20th centuries. The term ''battleship'' came into use in the late 1880s to describe a type of ...

fleet 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, when it was dissolved following Japan's surrender ...

History

First established on 28 December 1903, the IJN 1st Fleet was created during the

Russo-Japanese War The Russo-Japanese War ( ja, 日露戦争, Nichiro sensō, Japanese-Russian War; russian: Ру́сско-япóнская войнá, Rússko-yapónskaya voyná) was fought between the Empire of Japan and the Russian Empire during 1904 and 1 ...

when the

Imperial General Headquarters The was part of the 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 equivalent to the United States ...

divided the

Readiness Fleet The was a fleet of the Imperial Japanese Navy. It was the main combat fleet of the Japanese Navy and formed the core of a wartime Combined Fleet organization. It was created from the Standing Small-Fleet in 1889. It was split into the 1st Fle ...

into a mobile strike force of

cruiser A cruiser is a type of warship. Modern cruisers are generally the largest ships in a fleet after aircraft carriers and amphibious assault ships, and can usually perform several roles. The term "cruiser", which has been in use for several hu ...

s and

destroyer In naval terminology, a destroyer is a fast, manoeuvrable, long-endurance warship intended to escort larger vessels in a fleet, convoy or battle group and defend them against powerful short range attackers. They were originally developed in ...

s to pursue the

Imperial Russian Navy The Imperial Russian Navy () operated as the navy of the Russian Tsardom and later the Russian Empire from 1696 to 1917. Formally established in 1696, it lasted until dissolved in the wake of the February Revolution of 1917. It developed from a ...

Vladivostok Vladivostok ( rus, Владивосто́к, a=Владивосток.ogg, p=vɫədʲɪvɐˈstok) is the largest city and the administrative center of Primorsky Krai, Russia. The city is located around the Zolotoy Rog, Golden Horn Bay on the Sea ...

-based cruiser squadron (the Imperial Japanese Navys 2nd Fleet), while the remaining bulk of the Japanese fleet (the IJN 1st Fleet) continued to blockade Port Arthur in hopes of luring the

s of the Russian Pacific Fleet out into a classic

line-of-battle The line of battle is a tactic in naval warfare in which a fleet of ships forms a line end to end. The first example of its use as a tactic is disputed—it has been variously claimed for dates ranging from 1502 to 1652. Line-of-battle tacti ...

confrontation. The two fleets were combined into the

Combined Fleet The was the main sea-going component of the Imperial Japanese Navy. 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 norm ...

for the final

Battle of Tsushima The Battle of Tsushima (Japanese:対馬沖海戦, Tsushimaoki''-Kaisen'', russian: Цусимское сражение, ''Tsusimskoye srazheniye''), also known as the Battle of Tsushima Strait and the Naval Battle of Sea of Japan (Japanese: 日 ...

. The decisive victory of the Japanese fleet over the

at the Battle of Tsushima validated the doctrine of the "decisive victory", or '' kantai kessen'' as stipulated by naval theorists such as

Alfred Thayer Mahan Alfred Thayer Mahan (; September 27, 1840 – December 1, 1914) was a United States naval officer and historian, whom John Keegan called "the most important American strategist of the nineteenth century." His book '' The Influence of Sea Power ...

and

Satō Tetsutarō was a Japanese military theorist and an admiral in the Imperial Japanese Navy. Biography Early career Born in the Tsuruoka domain, Dewa Province (present day Tsuruoka city, Yamagata prefecture), Satō graduated from the 14th class of the Imp ...

in the eyes of the

Imperial Japanese Navy General Staff The was the highest organ within the Imperial Japanese Navy. 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 adminis ...

, and future naval procurement and deployment was centered on refinements of this doctrine.Peattie & Evans, ''Kaigun'' The Mahanian objective was to build a

fleet in being In naval warfare, a "fleet in being" is a naval force that extends a controlling influence without ever leaving port. Were the fleet to leave port and face the enemy, it might lose in battle and no longer influence the enemy's actions, but while ...

, a naval force kept deliberately in

strategic reserve A strategic reserve is the reserve of a commodity or items that is held back from normal use by governments, organisations, or businesses in pursuance of a particular strategy or to cope with unexpected events. A document issued by the US Departm ...

, as secondary forces based on cruisers and destroyers waged a campaign of attrition against an approaching enemy, who would then be destroyed in a climactic final battle similar to the Battle of Tsushima.Willmont, ''After Midway: Japanese Naval Strategy 1942-45'', pp. 177–199Evans, ''Kaigun'' As a result of this doctrine, although individual ships and task forces were dispatched on occasion for specific combat operations, the main force in the Imperial Japanese Navy was mostly held in reserve from the time of its inception until near the end of World War II.

Commanders of the IJN 1st Fleet

Wendel, Axis History Database Chief of Staff

References

Books

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External links

* {{IJN 1 Military units and formations established in 1903 Military units and formations disestablished in 1944