was the

lead ship The lead ship, name ship, or class leader is the first of a series or class of ships that are all constructed according to the same general design. The term is applicable to naval ships and large civilian vessels. Large ships are very comple ...

of the two-ship of

armoured 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 in 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 ...

. She was named after

Mount Tsukuba is an mountain located at the northern-end of Tsukuba, Japan. It is one of the most famous mountains in Japan, particularly well known for its double peaks, and . Many people climb the so-called "purple mountain" every year for the panorami ...

located in

Ibaraki prefecture is a Prefectures of Japan, prefecture of Japan located in the Kantō region of Honshu. Ibaraki Prefecture has a population of 2,828,086 (1 July 2023) and has a geographic area of . Ibaraki Prefecture borders Fukushima Prefecture to the north, ...

north of

Tokyo Tokyo, officially the Tokyo Metropolis, is the capital of Japan, capital and List of cities in Japan, most populous city in Japan. With a population of over 14 million in the city proper in 2023, it is List of largest cities, one of the most ...

. On 28 August 1912, ''Tsukuba'' was re-classified as a

battlecruiser The battlecruiser (also written as battle cruiser or battle-cruiser) was a type of capital ship of the first half of the 20th century. These were similar in displacement, armament and cost to battleships, but differed in form and balance of att ...

. page 77

Background

Construction of the ''Tsukuba''-class cruisers was ordered under the June 1904 Emergency Fleet Replenishment Budget of 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 ...

, spurred on by the unexpected loss of the

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 ...

s and to

naval mine A naval mine is a self-contained explosive weapon placed in water to damage or destroy surface ships or submarines. Similar to anti-personnel mine, anti-personnel and other land mines, and unlike purpose launched naval depth charges, they are ...

s in the early stages of the war.Chesneau, ''Conway's All the World's Fighting Ships 1906–1921'', page 232 These were the first major capital ships to be designed and constructed entirely by Japan in a Japanese shipyard, albeit with imported weaponry and numerous components. However, ''Tsukuba'' was designed and completed in a very short time, and suffered from numerous technical and design problems, including strength of its hull, stability and mechanical failures. The ship was reclassified as a

in 1912.

Design

The ''Tsukuba''-class design had a conventional

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 ...

hull design, powered by two vertical triple-expansion steam engines, with twenty Miyabara boilers, yielding design speed of and a range of at . During speed trials in Hiroshima Bay prior to commissioning, ''Tsukuba'' attained a top speed of . In terms of armament, the ''Tsukuba''-class was one of the most heavily armed cruisers of its time, with four 12-inch 41st Year Type guns as the

main battery A main battery is the primary weapon or group of weapons around which a warship is designed. As such, a main battery was historically a naval gun or group of guns used in volleys, as in the broadsides of cannon on a ship of the line. Later, th ...

, mounted in twin

gun turret A gun turret (or simply turret) is a mounting platform from which weapons can be fired that affords protection, visibility and ability to turn and aim. A modern gun turret is generally a rotatable weapon mount that houses the crew or mechanis ...

s to the fore and aft, along the centerline of the vessel.

Secondary armament Secondary armaments are smaller, faster-firing weapons that are typically effective at a shorter range than the main battery, main (heavy) weapons on military systems, including battleship- and cruiser-type warships, tanks/armored personnel c ...

consisted of twelve guns and twelve 4.7-inch 41st Year Type guns, and four

QF 3-pounder Hotchkiss The QF 3-pounder Hotchkiss or in French use Canon Hotchkiss à tir rapide de 47 mm were a family of long-lived light naval guns introduced in 1886 to defend against new, small and fast vessels such as torpedo boats and later submarines. T ...

guns.

Service record

''Tsukuba'' was laid down on 14 January 1905, launched 26 December 1905 and commissioned on 14 January 1907 at

Kure Naval Arsenal was one of four principal naval shipyards owned and operated by the Imperial Japanese Navy. History The Kure Naval District was established at Kure, Hiroshima in 1889, as the second of the naval districts responsible for the defense of the ...

, with Captain Heitarō Takenouchi as her chief equipping officer and first commander. Lettera ambasc

Shortly after commissioning, and with Vice Admiral Ijuin Gorō on board, ''Tsukuba'' and ''Chitose'' were sent on a voyage to the

United States The United States of America (USA), also known as the United States (U.S.) or America, is a country primarily located in North America. It is a federal republic of 50 U.S. state, states and a federal capital district, Washington, D.C. The 48 ...

to attend the International Naval Review by President

Theodore Roosevelt Theodore Roosevelt Jr. (October 27, 1858 – January 6, 1919), also known as Teddy or T.R., was the 26th president of the United States, serving from 1901 to 1909. Roosevelt previously was involved in New York (state), New York politics, incl ...

as a part of

Jamestown Exposition The Jamestown Exposition, also known as the Jamestown Ter-Centennial Exposition of 1907, was one of the many world's fairs and expositions that were popular in the United States in the early part of the 20th century. Commemorating the 300th anni ...

of 1907, the tricentennial celebrations marking the founding of the

Jamestown Colony The Jamestown settlement in the Colony of Virginia was the first permanent English settlement in the Americas. It was located on the northeast bank of the James River, about southwest of present-day Williamsburg. It was established by the L ...

. They then traveled on to

Portsmouth Portsmouth ( ) is a port city status in the United Kingdom, city and unitary authority in Hampshire, England. Most of Portsmouth is located on Portsea Island, off the south coast of England in the Solent, making Portsmouth the only city in En ...

England England is a Countries of the United Kingdom, country that is part of the United Kingdom. It is located on the island of Great Britain, of which it covers about 62%, and List of islands of England, more than 100 smaller adjacent islands. It ...

to pay respect to the fellow

Royal Navy The Royal Navy (RN) is the naval warfare force of the United Kingdom. It is a component of His Majesty's Naval Service, and its officers hold their commissions from the King of the United Kingdom, King. Although warships were used by Kingdom ...

in the

Anglo-Japanese Alliance The was an alliance between the United Kingdom and the Empire of Japan which was effective from 1902 to 1923. The treaty creating the alliance was signed at Lansdowne House in London on 30 January 1902 by British foreign secretary Lord Lans ...

, and attended the 25th anniversary of Kiel Regatta in Kiel, Germany, where she received the imperial visit of Kaiser

Wilhelm II Wilhelm II (Friedrich Wilhelm Viktor Albert; 27 January 18594 June 1941) was the last German Emperor and King of Prussia from 1888 until Abdication of Wilhelm II, his abdication in 1918, which marked the end of the German Empire as well as th ...

. She then visited Flushing and

Ostend Ostend ( ; ; ; ) is a coastal city and municipality in the province of West Flanders in the Flemish Region of Belgium. It comprises the boroughs of Mariakerke, Raversijde, Stene and Zandvoorde, and the city of Ostend proper – the la ...

in Flanders, Holland; Brest and

Bordeaux Bordeaux ( ; ; Gascon language, Gascon ; ) is a city on the river Garonne in the Gironde Departments of France, department, southwestern France. A port city, it is the capital of the Nouvelle-Aquitaine region, as well as the Prefectures in F ...

in France;

Vigo Vigo (, ; ) is a city and Municipalities in Spain, municipality in the province of province of Pontevedra, Pontevedra, within the Autonomous communities of Spain, autonomous community of Galicia (Spain), Galicia, Spain. Located in the northwest ...

Lisbon Lisbon ( ; ) is the capital and largest city of Portugal, with an estimated population of 567,131, as of 2023, within its administrative limits and 3,028,000 within the Lisbon Metropolitan Area, metropolis, as of 2025. Lisbon is mainlan ...

Naples Naples ( ; ; ) is the Regions of Italy, regional capital of Campania and the third-largest city of Italy, after Rome and Milan, with a population of 908,082 within the city's administrative limits as of 2025, while its Metropolitan City of N ...

Malta Malta, officially the Republic of Malta, is an island country in Southern Europe located in the Mediterranean Sea, between Sicily and North Africa. It consists of an archipelago south of Italy, east of Tunisia, and north of Libya. The two ...

Venice Venice ( ; ; , formerly ) is a city in northeastern Italy and the capital of the Veneto Regions of Italy, region. It is built on a group of 118 islands that are separated by expanses of open water and by canals; portions of the city are li ...

and

Trieste Trieste ( , ; ) is a city and seaport in northeastern Italy. It is the capital and largest city of the Regions of Italy#Autonomous regions with special statute, autonomous region of Friuli-Venezia Giulia, as well as of the Province of Trieste, ...

before returning to Japan via the

Suez Canal The Suez Canal (; , ') is an artificial sea-level waterway in Egypt, Indo-Mediterranean, connecting the Mediterranean Sea to the Red Sea through the Isthmus of Suez and dividing Africa and Asia (and by extension, the Sinai Peninsula from the rest ...

and

Indian Ocean The Indian Ocean is the third-largest of the world's five oceanic divisions, covering or approximately 20% of the water area of Earth#Surface, Earth's surface. It is bounded by Asia to the north, Africa to the west and Australia (continent), ...

, thus circumnavigating the globe. After her return to Japan, ''Tsukuba'' was assigned to Commander

Hirose Katsuhiko (September 20, 1862October 20, 1920) was a Japanese Rear-Admiral of the First Sino-Japanese War and the Russo-Japanese War. He was known as the elder brother of the war hero Hirose Takeo as well as the commander of the '' Akitsushima'' during ...

(the brother of the war hero Hirose Takeo) and escorted 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 ...

’s

Great White Fleet The Great White Fleet was the popular nickname for the group of United States Navy battleships that completed a journey around the globe from 16 December 1907, to 22 February 1909, by order of President Foreign policy of the Theodore Roosevelt ...

through Japanese waters on its around-the-world voyage in October 1908. Commander

Isamu Takeshita was an admiral in the Imperial Japanese Navy. He was also a diplomat whose accomplishments included helping end the Russo-Japanese War favorably for Japan and obtaining former German possessions in the Pacific for Japan following World War I. In ...

was the commander of ''Tsukuba'' from July through September 1912, followed by Captain

Kantarō Suzuki Baron was a Japanese politician and admiral who served as prime minister of Japan from 7 April to 17 August 1945, during World War II. He was prime minister at the time of Japan's surrender on 15 August. Born in Osaka, Suzuki graduated from th ...

to May 1913, and Commander Katō Hiroharu from December 1913 to May 1914. ''Tsukuba'' served in

World War I World War I or the First World War (28 July 1914 – 11 November 1918), also known as the Great War, was a World war, global conflict between two coalitions: the Allies of World War I, Allies (or Entente) and the Central Powers. Fighting to ...

, initially during the blockade of the German port of

Qingdao Qingdao, Mandarin: , (Qingdao Mandarin: t͡ɕʰiŋ˧˩ tɒ˥) is a prefecture-level city in the eastern Shandong Province of China. Located on China's Yellow Sea coast, Qingdao was long an important fortress. In 1897, the city was ceded to G ...

in China during the

siege of Qingdao The siege of Tsingtao (; ; zh, s=青岛战役, t=青島戰役) was the attack on the German port of Qingdao (Tsingtao) from Jiaozhou Bay during World War I by Japan and the United Kingdom. The siege was waged against Imperial Germany between 2 ...

from September 1914 as part of Japan's contribution to the Allied war effort under the

. After the fall of the city, ''Tsukuba'' was sent out as part of the search for the German

East Asia Squadron The German East Asia Squadron () was an Imperial German Navy cruiser squadron which operated mainly in the Pacific Ocean between the mid-1890s until 1914, when it was destroyed at the Battle of the Falkland Islands. It was based at Germany's Ji ...

in the

South Pacific The Pacific Ocean is the largest and deepest of Earth's five Borders of the oceans, oceanic divisions. It extends from the Arctic Ocean in the north to the Southern Ocean, or, depending on the definition, to Antarctica in the south, and is ...

until the destruction of the German squadron in the Battle of the Falklands in December 1914. ''Tsukuba'' remained in Japanese home waters in 1915 and 1916. On 4 December 1915, ''Tsukuba'' was in a fleet review off of

Yokohama is the List of cities in Japan, second-largest city in Japan by population as well as by area, and the country's most populous Municipalities of Japan, municipality. It is the capital and most populous city in Kanagawa Prefecture, with a popu ...

, attended by

Emperor Taishō , posthumously honored as , was the 123rd emperor of Japan according to the traditional order of succession, reigning from 1912 until his death in 1926. His reign, known as the Taishō era, was characterized by a liberal and democratic shift in ...

in which 124 ships participated. A similar fleet review was held again off Yokohama on 25 October 1916. On 14 January 1917, ''Tsukuba'' exploded while in port at

Yokosuka is a city in Kanagawa Prefecture, Japan. , the city has a population of 373,797, and a population density of . The total area is . Yokosuka is the 11th-most populous city in the Greater Tokyo Area, and the 12th in the Kantō region. The city i ...

. Some 200 crewmen were killed immediately, and over 100 more were drowned as the battlecruiser sank in shallow waters within twenty minutes, with a total loss of 305 men. The force of the explosion broke windows in

Kamakura , officially , is a city of Kanagawa Prefecture in Japan. It is located in the Kanto region on the island of Honshu. The city has an estimated population of 172,929 (1 September 2020) and a population density of 4,359 people per km2 over the tota ...

, more than twelve kilometers away. At the time of the disaster, more than 400 crewmen were on shore leave, which is why so many survived. The cause of the explosion was later attributed to a fire in her ammunition

magazine A magazine is a periodical literature, periodical publication, print or digital, produced on a regular schedule, that contains any of a variety of subject-oriented textual and visual content (media), content forms. Magazines are generally fin ...

, possibly through spontaneous combustion from deterioration of the

Shimose powder was a type of explosive shell-filling developed by the Japanese naval engineer (1860–1911). Shimose, born in Hiroshima Prefecture, graduated from Tokyo Imperial University and became one of Japan's earliest holders of a doctorate in eng ...

in her shells. The masts, bridge and smokestacks of the vessel remained above water, and afterwards, her hulk was raised, and used as a target for

naval aviation Naval aviation / Aeronaval is the application of Military aviation, military air power by Navy, navies, whether from warships that embark aircraft, or land bases. It often involves ''navalised aircraft'', specifically designed for naval use. Seab ...

training. It was formally removed from the

navy list A Navy Directory, Navy List or Naval Register is an official list of naval officers, their ranks and seniority, the ships which they command or to which they are appointed, etc., that is published by the government or naval authorities of a co ...

on 1 September 1917 and broken up for scrap in 1918.

Notes

References

* * * * * *

External links

New York Times article on loss of Tsukuba
{{DEFAULTSORT:Tsukuba Tsukuba-class cruisers Ships built by Kure Naval Arsenal 1905 ships World War I cruisers of Japan Cruisers of the Imperial Japanese Navy Maritime incidents in 1917 Ships sunk by non-combat internal explosions Shipwrecks in Tokyo Bay Naval magazine explosions