North Borneo (Japanese Occupation)

In World War II, the Japanese invasion of the island of Borneo started with the unopposed landing of the Japanese forces at Miri and Seria on 16 December 1941, with the objective of securing oil supplies.

On 1 January 1942, the Japanese navy landed unopposed in Labuan. The next day, 2 January 1942, the Japanese landed at Mempakul on North Borneo territory. After negotiations with the Officers-in-charge of Jesselton as to its surrender, while they were waiting for troop reinforcements, Jesselton was occupied by the Japanese on 8 January. Another strong Japanese army detachment arrived from Mindanao and began to land on Tarakan Island, before proceeding to Sandakan on 17 January. The Japanese arrival was met with no strong resistance, as the protectorate mainly relied on the Royal Navy for defence. Although North Borneo had a police force, it never had its own army or navy. By the end of January, North Borneo was completely occupied by the Japanese. It was administered as part of the Empire of Japan, with the officers of the chartered company being allowed to continued administration under Japanese supervision.

As part of the Allied Campaign to retake their possessions in the East, Allied forces deployed to Borneo under the Borneo Campaign to liberate the island. The Australian Imperial Force (AIF) played a significant part in the mission, with the force being sent to Tarakan and Labuan islands to secure the east and western Borneo. The Allied Z Special Unit provided intelligence gatherings and other information from the Japanese that could facilitated the AIF landings, while United States submarines were used to transport Australian commandos to Borneo. Most of the major towns of North Borneo were heavily bombed during these period.

The war ended on 15 August 1945 following the Japanese surrender and the administration of North Borneo was undertaken by the British Military Administration.