Although Portugal was neutral during the Second World War, in December 1941, Portuguese Timor was occupied by a small British, Australian and Dutch force, to preempt a Japanese invasion. However, the Japanese did invade in the Battle of Timor in February 1942. Under Japanese occupation, the borders of the Dutch and Portuguese were overlooked with Timor island being made a single Imperial Japanese Army (IJA) administration zone. 400 Australian and Dutch commandos trapped on the island by the Japanese invasion waged a guerrilla campaign, which tied up Japanese troops and inflicted over 1,000 casualties. Timorese and the Portuguese helped the guerillas but following the Allies' eventual evacuation, Japanese retribution from their soldiers and Timorese militia raised in West Timor was severe. By the end of the War, an estimated 40–60,000 Timorese had died, the economy was in ruins, and famine widespread. (see Battle of Timor).