No.1-class landing ship


The No.1-class landing ship was a class of amphibious assault ships of the Imperial Japanese Navy, serving during and after World War II. The IJN also called them 1st class transporter.

Background

The IJN lost too many destroyers while employed as transporters in the Guadalcanal Campaign. Therefore, the IJN wanted a transporter which could penetrate the front line. It was realized rapidly after Operation Ke.

Design

In April 1943, the General Staff requested a high-speed military transporter to the Technical Department. The requirements were as follows:
The General Staff thought it was possible to use a variant of the for this plan, because they aimed to utilise mass production. In this original plan, the requirement for a slope was not considered. They thought about a Japanese version of the High speed transport (APD).
The Technical Department, however, did not agree with this plan. They submitted a more aggressive plan to the General Staff. They increased the number of landing craft carried and with the effect of reducing the time for landing operations.
In addition, about the mass production effect, they intended to deal with this by reducing the shipyards being used for production.
At that time, the stern slope and operating ability of the amphibious tanks were added.
In September 1943, the Kure Naval Arsenal finished the detailed design. Her project number was J37.

Construction

The IJN nominated Kure Naval Arsenal as the main builder and Mitsubishi Heavy Industries as support builder.
Lead ship was constructed at Mitsubishi, laid down on 5 November 1943, launched on 8 February 1944, and completed on 10 May 1944.
The Kure Naval Arsenal completed 15 vessels, Mitsubishi completed 6 vessels.
The Kure Naval Arsenal was earnest. They made the original sized wooden samples, and learned a work procedure. They used the 's dock and repeated build 2 vessels at the same time. Therefore, most of Kure's vessels were completed within 80 days from being laid down.
The completed vessels were sent one by one to the front.

Service

Their primary role was that of a transporter, however since their armaments were strong they were useful as multi-purpose ships at the front, functioning as transporters, as minelayers and as escort ships.
Most of these vessels were sent to the Battle of Leyte and transportation duty of the Bonin Islands. By that time, the IJN already lost air superiority and thalassocracy in those areas and these vessels suffered heavy losses.
5 vessels survived war and were surrendered to the Allies.