On 29 September 1941, Hawaii Maru was requisitioned by the Japanese Imperial Army as a troop transport-ship and was used as such during the invasion of the Philippines. In April 1943 the ship transported some 1,000 Dutch prisoners from Singapore to Moji Port. Several Dutch soldiers died during the three-week journey. On 26 November 1943 Hawaii Maru again transported 1,230 Dutch and 150 British POWs from Singapore to Moji, and survived an attack of B-25 Mitchell bombers, which sank Hakone Maru. On 27 April 1944, Hawaii Maru was hit by a torpedo fired by the American submarine USS Trigger, but stayed afloat.[2]