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The signing of the Nazi-Soviet Non-Agression pact in August 1939, caused France immediately to ban the French Communist Party and, soon afterwards, to declare illegal all Vietnamese political parties including the ICP. The colonial authorities began a crack down on communists, arresting an estimated 2,000 and closing down all communist and radical journals. The party consequently was forced to shift its activities to the countryside, where French control was weaker--a move that was to benefit the communists in the long run. In November the ICP Central Committee held its Sixth Plenum with the goal of mapping out a new united front strategy, the chief task of which was national liberation. According to the new strategy, support would now be welcomed from the middle class and even the landlord class, although the foundation of the party continued to be the proletarian-peasant alliance.
After the fall of France to the Nazis in June 1940, Japan demanded that the French colonial government close the HanoiKunming railway to shipments of war-related goods to China. In an agreement with the Vichy government in France in August, Japan formally recognized French sovereignty in Indochina in return for access to military facilities, transit rights, and the right to station occupation troops in Tonkin. On September 22, however, Japanese troops invaded from China, seizing the Vietnamese border towns of Dong Dang and Lang Son. As the French retreated southward, the Japanese encouraged Vietnamese troops to support the invasion. The communists in the Bac Son district border area moved to take advantage of the situation, organizing self-defense units and establishing a revolutionary administration. The French protested to the Japanese, however, and a cease-fire was arranged whereby the French forces returned to their posts and promptly put down all insurrection. Most of the communist forces in Tonkin were able to retreat to the mountains. In similar short-lived uprisings that took place in the Plain of Reeds area of Cochinchina, however, the communist rebel forces had nowhere to retreat and most were destroyed by the French.
Source: U.S. Library of Congress