During Japan’s initial conquest, it captured 4,000,000 barrels (640,000 m3) of oil (~550,000 tonnes) left behind by retreating Allied forces; and by 1943, was able to get production in the Dutch East Indies up to 50 million barrels (7,900,000 m3) of oil (~6.8 million tonnes), 76 per cent of its 1940 output rate.