http://en.wikipedia.org/wiki/Pacific_War In September 1940, Japan decided to cut China's only land line to the outside world by seizing Indochina, which was controlled at the time by Vichy France. Japanese forces broke their agreement with the Vichy administration and fighting broke out, ending in a Japanese victory. On 27 September Japan signed a military alliance with Germany and Italy, becoming one of the three Axis Powers. In practice, there was little coordination between Japan and Germany until 1944, by which time the U.S. was deciphering their secret diplomatic correspondence. =>為了切斷中國的對外聯繫而進攻法屬印度支那 http://en.wikipedia.org/wiki/Japanese_invasion_of_French_Indochina In early 1940, troops of the Imperial Japanese Army (IJA) moved to seize Longzhou in south Guangxi, where the eastern branch of the railroad from Hanoi reaches the border, and also tried to move west to cut the rail line to Kunming. Chinese resistance, supplied from Indochina, was tough. Then on 22 June 1940, France signed an armistice with Germany, Japan's Axis ally. This established the neutral but under Axis influence Vichy France government in the unoccupied part of France. Vichy France also controlled at that time most French overseas possessions, including Indochina. The IJA captured Longzhou, closing one route, but the rail line to Yunnan was still open. Japanese aerial bombing did not close it. Japan pressured the Vichy government to close the railway, but the French did not agree. =>因為未能迅速切斷交通線，所以選擇向維琪政府施壓 http://en.wikipedia.org/wiki/French_Indochina_in_World_War_II Catroux, who had first asked for British support, had no source of military assistance from outside France, stopped the trade to China to avoid further provoking the Japanese. A Japanese verification group, headed by Issaku Nishimura entered Indochina on June 25. =>維琪法國受到日本施壓要終止與中國的交通線 http://ww2history.com/experts/Akira_Iriye/Japanese_invasion_of_Indochina So what the Japanese do is, in order to win this victory in China, they want to cut off the shipment of arms from the West, from the United States and also via the Northern Vietnamese route or the Northern Burmese route. So Japan puts pressure on Great Britain to close the so-called Burma Road, also puts pressure on the French authorities in Vietnam to let the Japanese stay there, basically, essentially, occupying Northern Indochina, and making sure that no shipment went from Indochina into China. =>為了打敗中國，日本希望阻斷位於中南半島的通道 http://www.desertwar.net/japanese-invasion-of-french-indochina.html In 1940, Japan had complete control of China’s coastal ports and cut off supplies by sea transport of the Chinese government. To further cut China’s arms supply lines and forced the Chinese out of the war, Japan invaded French Indochina in order to cut off supply routes from there to China. =>為了徹底切斷中國的對外聯繫，日本入侵法屬印度支那 所以說，日軍佔領法屬印度支那真的和在中國的泥淖戰況毫無關係嗎? -- The nation which forgets its defenders will be itself forgotten. ～John Calvin Coolidge, Jr. --

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