IJA conducted a landing operation in front of the enemy during the 1st Shanghai Incident in 1932 and experienced great difficulty in transporting landing craft and landing soldiers’ boarding on landing crafts. Therefore, IJA came up with the idea of a "Landing Craft Mother Ship" that could store landing craft in a hold and launch them with landing soldiers onboard. By doing this, it was possible to avoid the dangerous embarkation of landing soldiers on the landing crafts and shorten the operation time. It was an idea unlike any other in Europe and the United States.
In 1933, IJA outsourced the design of "特種輸送船 Special Transport Ship" to IJN. 艦政本部 Naval Shipping Administration Headquarter was in charge of the design. It's unprecedented, so several changes were made until the design was finalized. That is why FIGs. 1 and 2 are slightly different. The core part is shown in FIG2, trolly wire pulled by the winch pulled Daihatsu on wooden stands from the storage position to the launching position. There were two slopes, and two Daihatsu could be launched at the same time, as shown in FIG3. The two slopes were not parallel and faced outwards, so 2 Daihatsu that launched at the same time, did not collide. A 泛水作業隊 Launching Unit was formed from one platoon of 6th Independent Shipping Engineer Regiment to carry out these launch operations. The cecomposition of the Jinshu Maru Launching Unit was as follows;
隊長 Commanding Officer: 1
伝令 Messenger: 1
衛生 Medic: 1
前部甲板分隊 Forward Deck Squad: 15 men
後部甲板分隊 Rear Deck Squad: 14 men
端艇甲板左舷分隊 Port Boat Deck Squad: 9 men
端艇甲板右舷分隊 Starboard Boat Deck Squad: 9 men
中甲板左舷 Port Middle Deck Squad: 9 men
中甲板右舷 Starboard Middle Deck Squad: 9 men
艉門左舷 Port Rear Door: 9 men
艉門右舷 Starboard Rear Door: 9 men
合計 Total: 86 men
This “Special Transport Ship" was constructed in 播磨造船所 Harima Shipyard and commissioned in 1935. She was named 神洲丸 Shinshu Maru, but she was completely concealed - even attached the battleship Hyuga's No2 funnel which was no longer needed due to the refurbishment, to hide the existence of the hangar. Because what IJA wanted to hide most was that she had the ability to operate airplanes. Therefore, the IJA disguised her hangar as "a place to keep horses" and called the hangar deck "馬欄甲板 Stable Deck". But, like the Hrikeens of MAC ships, they could not land on Shinshu Maru. Her unique appearance caught the attention of the US Navy, and close-up photos like her FIG4 were also taken.
Her brief performances were as follows;
Standard Displacement: 7,100t
Full Load Displacement: 8,108t
Size: 144m (Length) x 22m (Width) x 4,2m (Draft)
Maximum Speed: 20.4kt
Cruising Range: 7,000 nautical miles
Standard Capacity: Approximately 1,200 men (Maximum 2,000 men)
Standard Load: Daihatsu x 30, Shohatsu x 20
Maximum Airplanes Carried: 12
Shinshu Maru participated in many landing operations in China. The first battlefield entry of her was the transportation of part of the 10th Division, which was temporarily mobilized during the outbreak of the Sino-Japanese War. FIG5 shows her with a large number of landing crafts during the Bias Bay landing operation in 1938. She was seen by Americans and the pictures were taken by them. FIG4 was one of the photos.
Landing operations participated before the start of the war;
太沽 Dagu: August 14, 1937
川沙 Chuansha: August 23, 1937
松江 Songjian: September 1, 1937
杭州湾 Hangzhou Bay: November 5, 1937
バイアス湾 Bias Bay: October 12, 1938
広東湾 Guangdong Bay: October 22, 1938
東京湾 Gulf of Tonkin: November 15, 1939
北部仏印 Northern French Indochina: September 1940
南部仏印 Southern French Indochina: July 1941
She was used in the Dutch East Indies Campaign even in the early days of WWII. Here, torpedoes fired by Mogami targeting USS CA Houston hit Shinshu Maru and other Japanese ships on the extension of the line of sight, and the 16th Army Commanding Officer and other HQ personnel on board have fallen into the sea on 1 March 1943. Because of the shallow waters, she was pulled up and returned to service in November 1943 with emergency repairs at the 101st Naval Construction and Repair Department in Singapore and complete repairs at the Harima Shipyard. However, due to the deterioration of the war situation, she could not be put into the landing operation, and she was engaged in transportation missions with Hi-57, HI-65, HI-81, HI-85, TAMA-33, TAMA-38, and MATA-40, etc. On her last voyage with MATA-40, she was sunk by USS Aspro, S / AG SS-309 torpedo attack on 3 January 1945.
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