旅順攻囲戦
During the Russo-Japanese War, "Ōshima" assisted in the Siege of Port Arthur. On 18 May 1904, under the command of Commander Hirose Katsuhiko (the elder brother of the famous Takeo Hirose) she collided in a heavy fog with the gunboat and sank in the early hours of the following morning in Liaotung Bay off of Port Arthur at position .