Japanese transport ship Unyo Maru No. 2

Unyo Maru No. 2 was requisitioned by the Imperial Japanese Navy on 2 November 1941, just over a month before the outbreak of the Pacific War.[1] She began a 20-day military conversion at Yokosuka Naval Yard on 6 November and was ultimately registered with the navy on 10 November.[1] Unyo Maru No. 2 was assigned to the Yokosuka Naval District as an auxiliary transport ship on 26 November 1941, but it almost immediately sailed for Indochina to take part in the invasion of Borneo.[1]

On 13 December 1941, the invasion force departed from Cam Ranh Bay, Indochina to attack Sarawak.[1] The naval forces, commanded by Vice Admiral Nobutake Kondō, escorted the army group under General Hisaichi Terauchi.[1] Unyo Maru No. 2, carrying equipment and supplies for the naval force, arrived at Lutong on 15 December and stayed there for the remainder of the invasion, which succeeded without much resistance from the British defenders.[1] On 22 December, the main body of the Japanese naval force, including Unyo Maru No. 2, disembarked Japanese troops at Miri and sailed for Kuching to commence the second phase of the invasion of Borneo.[1] The convoy arrived off Kuching two days later and supported the attack on the town, all the while being harassed by Dutch bombers and submarines.[1] During one such attack, a bombing raid by three Dutch Air Force Martin B-10 bombers on 26 December, Unyo Maru No. 2 was set on fire by bombs and sunk, killing eight crewmen.[1] The cargo ship was struck from the navy list on 15 January 1942.[1]