"The preference of the Navy Staff was to launch assaults on Hong Kong, Singapore and Malaya, while at the same time overrunning Dutch Sumatra, Borneo and Java. Their assumption, which proved entirely correct, was that the European empires in Asia had been dealt lethal blow at home by the German occupation of the Netherlands and France and the continuing German threat to the British Isles. The Dutch colonies, in particular, looked like easy quarry; they had the added allure of being oil-rich. Malaya, meanwhile, was the world's biggest producer of rubber. Living space for Japanese settlers was all very well, but the Japanese Empire needed strategic raw materials far more urgently. In 1940 army planners had argued for an invasion of Indo-China, to provide new bases from which to attack the Chinese Nationalists in Sichuan. As War Minister in the new Cabinet formed by Prince Konoe in July 1940, Tôjô had insisted that unless Japan struck soon, she risked being too late. By 1941, it is true, some senior generals had become less enthusiastic about this idea. But by now the proponents of the Southern strategy had the upper hand."