was a

minelayer A minelayer is any warship, submarine, military aircraft or land vehicle deploying explosive mines. Since World War I the term "minelayer" refers specifically to a naval ship used for deploying naval mines. "Mine planting" was the term for ins ...

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, Potsdam Declaration, when it was dissolved followin ...

, which was in service during the final stages of

World War II World War II or the Second World War (1 September 1939 – 2 September 1945) was a World war, global conflict between two coalitions: the Allies of World War II, Allies and the Axis powers. World War II by country, Nearly all of the wo ...

. She 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 what was intended to be a two-vessel class, but her

sister ship A sister ship is a ship of the same Ship class, class or of virtually identical design to another ship. Such vessels share a nearly identical hull and superstructure layout, similar size, and roughly comparable features and equipment. They o ...

, designated ''Vessel #1822'' was not completed before the end of the war.

Building

During the very final stages of World War II, in preparation for the anticipated Allied invasion of the Japanese home islands, the Imperial Japanese Navy perceived the need to block the entrances to the

Sea of Japan The Sea of Japan is the marginal sea between the Japanese archipelago, Sakhalin, the Korean Peninsula, and the mainland of the Russian Far East. The Japanese archipelago separates the sea from the Pacific Ocean. Like the Mediterranean Sea, it ...

, namely the

La Pérouse Strait La Pérouse Strait (), or , is a strait dividing the southern part of the Russian island of Sakhalin from the northern part of the Japanese island of Hokkaidō, and connecting the Sea of Japan on the west with the Sea of Okhotsk on the east. ...

Tsugaru Strait The is a strait between Honshu and Hokkaido in northern Japan connecting the Sea of Japan with the Pacific Ocean. It was named after the western part of Aomori Prefecture. The Seikan Tunnel passes under it at its narrowest point 12.1 miles ...

and

Tsushima Strait or Eastern Channel (; ''Dongsuro'') is a channel of the Korea Strait, which lies between Korea and Japan, connecting the Sea of Japan, the Yellow Sea, and the East China Sea. The strait is the channel to the east and southeast of Tsushima Isl ...

to protect Japan’s long and relatively lightly defended western coastline. However, as all

s has been sunk by that time, an emergency program was begun under the ''Maru Sen'' Programme to construct several small vessels for this task. ''Minoo'' was a modified ''Type 2D'' wartime standard cargo ship, which had been laid down by the Naniwa Dock Company on November 29, 1944. It was requisitioned by the Imperial Japanese Navy in December before completion, was launched on May 13, 1945, and was commissioned into service on August 5, 1945 after modifications at the

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 ...

Operational history

On completion, ''Minoo'' was assigned to the

Kure Naval District was the second of four main administrative districts of the pre-war Imperial Japanese Navy. Its territory included the Inland Sea of Japan and the Pacific coasts of southern Honshū from Wakayama to Yamaguchi prefectures, eastern and northern K ...

, but the

surrender of Japan The surrender of the Empire of Japan in World War II was Hirohito surrender broadcast, announced by Emperor Hirohito on 15 August and formally Japanese Instrument of Surrender, signed on 2 September 1945, End of World War II in Asia, ending ...

occurred only 5 days after her commissioning. She was 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 October 5, 1945. From September 1945 through December 1946, ''Minoo'' was used as a repatriation transport, shuttling between

Okinawa most commonly refers to: * Okinawa Prefecture, Japan's southernmost prefecture * Okinawa Island, the largest island of Okinawa Prefecture * Okinawa Islands, an island group including Okinawa itself * Okinawa (city), the second largest city in th ...

Shanghai Shanghai, Shanghainese: , Standard Chinese pronunciation: is a direct-administered municipality and the most populous urban area in China. The city is located on the Chinese shoreline on the southern estuary of the Yangtze River, with the ...

Hakata is a ward of the city of Fukuoka in Fukuoka Prefecture, Japan. Many of Fukuoka Prefecture and Fukuoka City's principal government, commercial, retail and entertainment establishments are located in the district. Hakata-ku is also the location o ...

, and

Sasebo is a core city located in Nagasaki Prefecture, Japan. It is the second-largest city in Nagasaki Prefecture, after its capital, Nagasaki. , the city had an estimated population of 230,873 in 102,670 households, and a population density of 540 per ...

returning demobilized Japanese troops and civilians from the Asian mainland to the

Japanese home islands The is an archipelago of 14,125 islands that form the country of Japan. It extends over from the Sea of Okhotsk in the northeast to the East China and Philippine seas in the southwest along the Pacific coast of the Eurasian continent, and cons ...

. She was scrapped in 1947.

Ships in class

Approximate vessels

The IJN used two merchant ships and experimented for before building ''Minoo''. One the ''Eijō Maru'', other the ''Kōryū Maru''. Their conversion was useful for ''Minoo''. Their brief careers are below. * , ex-''Type 2D'' wartime standard cargo ship, gross
Launched at

Mitsubishi Heavy Industries is a Japanese Multinational corporation, multinational engineering, electrical equipment and electronics corporation headquartered in Tokyo, Japan. MHI is one of the core companies of the Mitsubishi Group and its automobile division is the prede ...

-Kōnan Shipyard on 11 August 1944, completed on 2 September 1944, enlisted by the Navy on 29 January 1945, classified to auxiliary minelayer and assigned to the Minelayer Division 18 ( Escort Fleet) on 10 March 1945, armaments installed on 20 April 1945 at

, Minelayer Division 18 was moved to 7th Fleet, minelaying at Japanese coastal waters in June 1945, sunk by USS ''Spadefish'' off

Okushiri Island is an island in Hokkaidō, Japan. It has an area of . The town of Okushiri and the Hiyama Prefectural Natural Park encompass the entire island. It has many pastures, beech tree forests, and a rocky coastline. There are two elementary school ...

on 17 June 1945, discharged on 10 August 1945. * , ex-''Type 2E'' wartime standard cargo ship, gross
Launched at Kawanami Kōgyō-Fukabori Shipyard on 22 June 1944, completed on 16 July 1944, transportation duty in Japanese coastal waters between 1944–1945, enlisted by the Navy on 6 May 1945, armaments install started at Hitachi Zōsen- Innoshima on 9 May 1945, classified to auxiliary minelayer and assigned to the Escort Fleet on 7 July 1945, sunk by air raid at Innoshima on 28 July 1945, discharged on 22 May 1946. She was sunk before rebuilt.

References

Notes

Books

* * * * * * Ships of the World special issue Vol.47, ''Auxiliary Vessels of the Imperial Japanese Navy'', , (Japan), March 1997 * The Maru Special, ''Japanese Naval Vessels No.42, "Japanese minelayers"'', (Japan), August 1980 * ''Century of Hitachi Zōsen Corporation'',

Hitachi Zosen Corporation , formerly , is a major Japanese industrial and engineering corporation. It produces waste treatment plants, industrial plants, precision machinery, industrial machinery, steel mill process equipment, steel structures, construction machinery, ...

(Japan), March 1985 * , ''Syllabus of Japanese merchant ships (1868–1945)'', Kaibundō (Japan), May 1976

External links

* * {{DEFAULTSORT:Minoo Minelayers of the Imperial Japanese Navy World War II mine warfare vessels of Japan Ships built in Japan 1945 ships