Japanese destroyer Oyashio

Kagerō class destroyer

Oyashio (親潮) was the fourth vessel to be commissioned in the 19 vessel destroyers built for the Imperial Japanese Navy in the late 1930s under the Circle Three Supplementary Naval Expansion Program (Maru San Keikaku).

The Kagerō class destroyers were outwardly almost identical to the preceding light cruiser sized , with improvements made by Japanese naval architects to improve stability and to take advantage of Japan's lead in torpedo technology. They were designed to accompany the Japanese main striking force and in both day and night attacks against the United States Navy as it advanced across the Pacific Ocean, according to Japanese naval strategic projections. Despite being one of the most powerful classes of destroyers in the world at the time of their completion, only one survived the Pacific War. Oyashio, built at the Maizuru Naval Arsenal, was laid down on 29 March 1938, launched on 29 November 1938 and commissioned on 20 August 1940.

At the time of the attack on Pearl Harbor, Oyashio, was assigned to Destroyer Division 15 (Desdiv 15), and a member of Destroyer Squadron 2 (Desron 2) of the IJN 2nd Fleet, and had deployed from Palau, as part of the escort for the aircraft carrier Japanese aircraft carrier Ryūjō in the invasion of the southern Philippines and minelayer Japanese minelayer Itsukushima. In early 1942, Oyashio participated in the invasion of the Netherlands East Indies, escorting the invasion forces for Menado, Kendari and Ambon in January, and the invasion forces for Makassar, Timor and Java in February. On 8 February, she rescued survivors from the destroyer Japanese destroyer Natsushio and on 5 March assisted Japanese destroyer Kuroshio in sinking a Royal Navy minelayer. At the end of March, she returned with the aircraft carrier Japanese aircraft carrier Kaga from Staring baai in Sulawesi to Sasebo. At the end of April, Oyashio deployed from Kure to assist in the occupation of the Cagayan Islands near Palawan in early May, and then returned with the damaged aircraft carrier Japanese aircraft carrier Shōkaku from Manila to Kure on 17 May. In early June, Oyashio deployed from Saipan as part of the troopship escort for the Battle of Midway. In mid June, Oyashio was assigned as escort for cruisers in projected further Indian Ocean raids, but the operation was cancelled by the time she reached Mergui in Burma, and she was reassigned as escort for the cruisers Japanese cruiser Kumano and Japanese cruiser Suzuya to Balikpapan and the Solomon Islands. During the Battle of the Eastern Solomons of 24 August she was part of Admiral Kondō's Advance Force, but was not in combat. During September, Oyashio was used for patrols between Truk and Guadalcanal, and in October began operations as a "Tokyo Express" high speed troop transport to Guadalcanal. These operations continued to early February 1943. During the Battle of Santa Cruz on 26 October, she was assigned to Admiral Kurita's Support Force, returning after the battle with Japanese cruiser Maya and Japanese cruiser Suzuya to Shortland Island. During the Naval Battle of Guadalcanal on 13–15 November, Oyashio, launched a torpedo attack against the American battleship Washington. After the battle, she returned with the cruiser Japanese cruiser Chōkai to Rabaul. On 21 November, she sortied from Rabaul to assist the destroyer Japanese destroyer Umikaze. During the Battle of Tassafaronga on 30 November, Oyashio torpedoed the American cruiser USS Pensacola.