was an early steam gunboat

Gunboat

A gunboat is a naval watercraft designed for the express purpose of carrying one or more guns to bombard coastal targets, as opposed to those military craft designed for naval warfare, or for ferrying troops or supplies.-History:...

, serving in the fledgling Imperial Japanese Navy

Imperial Japanese Navy

The Imperial Japanese Navy was the navy of the Empire of Japan from 1869 until 1947, when it was dissolved following Japan's constitutional renunciation of the use of force as a means of settling international disputes...

. She was named after the island of Ōshima

Oshima

-Places: :** Nii Ōshima Island, part of Niihama in Ehime Prefecture** Ōshima, Ehime, an island connected by the Hakata-Ōshima Bridge and the Kurushima-Kaikyo Bridge...

 off Shizuoka prefecture

Shizuoka Prefecture

is a prefecture of Japan located in the Chūbu region on Honshu island. The capital is the city of Shizuoka.- History :Shizuoka prefecture was formed from the former Tōtōmi, Suruga and Izu provinces.The area was the home of the first Tokugawa Shogun...

.

History

Ōshima was a metal-hulled three-masted gunboat with a triple expansion reciprocating steam engine

Steam engine

A steam engine is a heat engine that performs mechanical work using steam as its working fluid.Steam engines are external combustion engines, where the working fluid is separate from the combustion products. Non-combustion heat sources such as solar power, nuclear power or geothermal energy may be...

 with two boilers driving two screws. Her design was based on a modified version of the and the French naval architect Louis-Émile Bertin

Louis-Émile Bertin

Louis-Émile Bertin was a French naval engineer, one of the foremost of his time, and a proponent of the "Jeune École" philosophy of using light, but powerfully armed warships instead of large battleships.-Early life:...

 contributed to her design. Ōshima was laid down at the Onohama Shipyards in Kobe

Kobe

, pronounced , is the fifth-largest city in Japan and is the capital city of Hyōgo Prefecture on the southern side of the main island of Honshū, approximately west of Osaka...

 under direction of the Kure Naval Arsenal

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 Japanese home islands along with the establishment of the...

 on August 29, 1889 and launched on October 14, 1891. She was completed on March 31, 1892.

Ōshima saw combat service in the First Sino-Japanese War

First Sino-Japanese War

The First Sino-Japanese War was fought between Qing Dynasty China and Meiji Japan, primarily over control of Korea...

, during which time an additional three 120 mm (5 in) guns and an additional three 47 mm (1.9 in) guns were fitted, patrolling between Korea

Korea

Korea ) is an East Asian geographic region that is currently divided into two separate sovereign states — North Korea and South Korea. Located on the Korean Peninsula, Korea is bordered by the People's Republic of China to the northwest, Russia to the northeast, and is separated from Japan to the...

, Dairen and Weihaiwei

Weihai

Weihai is a city in eastern Shandong Province, People's Republic of China. It is the easternmost prefecture-level city of the province and a major seaport. Between 1898 and 1930, the town was a British colony known as Weihaiwei or the Weihai Garrison , and sometimes as Port Edward...

 in a reserve capacity in the IJN 2nd Fleet

IJN 2nd Fleet

The was a fleet of the Imperial Japanese Navy.-History:First established on 28 December 1903, the IJN 2nd Fleet was created by the Imperial General Headquarters as a mobile strike force of cruisers and destroyers to pursue the Imperial Russian Navy's Vladivostok-based cruiser squadron while the...

.

On 21 March 1898, Oshima was re-designated as a second-class gunboat

Gunboat

A gunboat is a naval watercraft designed for the express purpose of carrying one or more guns to bombard coastal targets, as opposed to those military craft designed for naval warfare, or for ferrying troops or supplies.-History:...

, and was used for coastal survey and patrol duties.

During the Russo-Japanese War

Russo-Japanese War

The Russo-Japanese War was "the first great war of the 20th century." It grew out of rival imperial ambitions of the Russian Empire and Japanese Empire over Manchuria and Korea...

, Ōshima assisted in the Siege of Port Arthur

Siege of Port Arthur

The Siege of Port Arthur , 1 August 1904 – 2 January 1905, the deep-water port and Russian naval base at the tip of the Liaotung Peninsula in Manchuria, was the longest and most violent land battle of the Russo-Japanese War....

. On 18 May 1904, she collided in a heavy fog with the gunboat Akagi

Japanese gunboat Akagi

| was an early steam gunboat, serving in the fledgling Imperial Japanese Navy. She was the fourth and final vessel to be completed in the four vessel , and was named after Mount Akagi in Gunma Prefecture.-History:...

 and sank off of Port Arthur

Lüshunkou

Lüshunkou is a district in the municipality of Dalian, Liaoning province, China. Also called Lüshun City or Lüshun Port, it was formerly known as both Port Arthur and Ryojun....

at position 39°01′N 121°08′E.

Ōshima was removed from the active list on 15 June 1905.