"The first Japanese move was against French Indo-China. In early 1939 the islands of Hainan and the Spratly Islands in the South China Sea were seized. In June the following year - by which time France had succumbed to the German blitzkrieg - the Japanese demanded that the French authorities admit a forty-man military mission whose role would be to prevent the shipment of war supplies to Chongqing. The French Governor-General acquiesced, but bid for a mutual defence pact in the hope of preserving the colony's integrity. Matsuoka dismissed this, demanding instead rights of transit for Japanese forces through Indo-China and the construction and use of airfields, as well as the stationing of Japanese troops to guard them. Realizing that they stood no chance if it came to a fight, the Vichy authorities agreed to this, leaving it to the Governor-General to handle the practicalities. However, the Japanese government grew impatient and on September 20 delivered an ultimatum to Hanoi, stating that Japanese troops would cross the border in two days' time with or without the consent of the French authorities. Once again the French capitulated. By September 23 northern Indo-China was in Japanese hands. Six months later the Japanese intervened to end clashes that had broken out between French forces and neighbouring Thailand. The effect of the resulting compromise was to bring Thailand too into the Japanese orbit. At the end of July 1941 Japanese troops completed the takeover by occupying southern Indo-China."