1September, 950 16 (the fifth day of the eighth lunar month), the Vietnam War of Resistance Against France began to cross the border of China. Since the outbreak of the all-out war against France and saving the nation in February 1946, the Vietnamese people have been in the guerrilla warfare stage. People's Republic of China (PRC) (China) recognized the Democratic Republic of Viet Nam for the first time and established formal diplomatic relations with it.
China sent a military advisory group and a political advisory group, and delivered a lot of materials to support the Vietnamese War of Resistance. 1950,16 In September, with the support of China, the Vietnamese People's Army launched a border campaign in the border areas between China and Vietnam. First of all, it launched an attack in Dongxi, annihilated nearly 10,000 enemy troops, uprooted the French strongholds from Gaoping to lang son, liberated five cities, and consolidated and expanded the liberated areas in northern Vietnam. Since then, the Vietnamese people have a solid rear, and the Vietnamese army has mastered the military initiative in northern Vietnam and gradually turned to the stage of local counter-offensive.