# Hōkoku Maru-class ocean liner

The Hōkoku Maru-class ocean liner (報國丸型貨客船,, Hōkoku Maru-gata Kakyakusen) was a class of ocean liners of Japan, serving during 1940 and World War II.

## Background

* 17 May 1937, the Ōsaka Mercantile Steamship Co.Ltd. (大阪商船,, Ōsaka Shōsen Kaisha, O.S.K. Lines) placed an order for three ocean liners to reinforce the Japan-Africa route. They were named Hōkoku Maru, Aikoku Maru and Kōkoku Maru (later renamed Gokoku Maru).
* They were beautiful, and luxuriously equipped. Their suites were named after ancient Japanese cities.

## Civilian service

* Hōkoku Maru was completed on 15 June 1940. Her maiden voyage was 2–12 July 1940, Yokohama-Dalian.
* On 17 July 1940, she departed to South America on her only overseas voyage. After this she stayed close to the Japanese mainland, as the Imperial Japanese Navy (IJN) feared losing her.
* Aikoku Maru was completed on 31 August 1941.
* In September 1941, both ships were enlisted by the IJN.
Construction data :
| Name | Kanji | Builder | Laid down | Launched | Completed | Note |
| Hōkoku Maru | 報國丸 | Tama Shipyards | 18 Aug 1938 | 5 Jul 1939 | 15 Jun 1940 | She was enlisted by the navy on 20 Sep 1941. |
| Aikoku Maru | 愛國丸 | Tama Shipyards | 28 Dec 1938 | 25 Apr 1940 | 31 Aug 1941 | She was enlisted by the navy on 1 Sep 1941. |
| Gokoku Maru | 護國丸 (ex-Kōkoku Maru (興國丸)) | Mitsui, Tamano Shipyard | 31 Jul 1939 as Kōkoku Maru | 2 Apr 1942 as Gokoku Maru | 4 Aug 1942 | Renamed Gokoku Maru in early 1942. She was enlisted by the navy on 27 Jul 1942. |

## Service in World War II

* Hōkoku Maru and Aikoku Maru became auxiliary cruisers, and they were assigned to the 24th Raider Division, Combined Fleet. When they learned of the outbreak of war they were north of Tuamotus.
* 27 April 1942, Aikoku Maru supported submarine I-30 which departed to Germany.
* 4 August 1942, Gokoku Maru was completed. She acted in the Indian Ocean until 30 November 1942.
* 11 November 1942, Hōkoku Maru was sunk by HMIS Bengal and tanker Ondina in the Indian Ocean. Aikoku Maru returned to Singapore.
* January 1943, Aikoku Maru and Gokoku Maru were dispatched to New Guinea They engaged in troop transportation duties afterward.
* 1 October 1943, they were classified to Auxiliary transport, and removed some armaments.
* 17 February 1944, Aikoku Maru was sunk by air raid at Chuuk.
* 10 November 1944, Gokoku Maru was sunk by a US submarine.
World War II service :
| Name | Career | Fate |
| Hōkoku Maru | Classified to auxiliary cruiser on 20 Sep 1941 | Sunk by HMIS Bengal and armed tanker Ondina at southwest of Cocos 20°00′S 93°00′E﻿ / ﻿20.000°S 93.000°E﻿ / -20.000; 93.000﻿ (Japanese auxiliary cruiser Hōkoku Maru sunk by HMIS Bengal, 11 November 1942), 11 Nov 1942 |
| Aikoku Maru | Classified to auxiliary cruiser on 5 Sep 1941 Classified to auxiliary transport on 1 Oct 1943 | Sunk during the Operation Hailstone, 17 Feb 1944 |
| Gokoku Maru | Classified to auxiliary cruiser on 4 Aug 1942 Classified to auxiliary transport on 1 Oct 1943 | Sunk by USS Barb off Gotō Islands 33°31′N 129°19′E﻿ / ﻿33.517°N 129.317°E﻿ / 33.517; 129.317﻿ (Japanese auxiliary cruiser Gokoku Maru sunk by USS Barb, 10 November 1944), 10 Nov 1944 |

## Photos

* O.S.K. Lines Hōkoku Maru
* O.S.K. Lines Aikoku Maru in 1941
* O.S.K. Lines Gokoku Maru on 2 April 1942
* IJN Hōkoku Maru in May 1942 at Penang
* IJN Hōkoku Maru on 29 July 1942 at Seletar
* IJN Hōkoku Maru on 18 September 1942 at Seletar
* IJN Aikoku Maru on 22 August 1942 at Seletar

## Footnotes

* ↑ If there is not an explanatory note, it is Hokoku Maru data, because the Aikoku Maru and Gokoku Maru did not have a career as merchant ships.
* ↑ They were named the best masterpiece of Dr. Haruki Watsuji. (by Hisashi Noma)
* ↑ Nara— Hōkoku Maru; Kyōto — Aikoku Maru; and Hakone— Gokoku Maru.