September 16, 1950, the fifth day of August (GY), anti-French war in Vietnam Vietnam border battle began.

1946 after the outbreak of anti-law comprehensive national salvation war, the Vietnamese people have been in the guerrilla war phase of the defense. January 18, 1950 (on com) People's Republic of China is the first to admit and to establish formal diplomatic relations with the Democratic Republic of Vietnam. China sent military advisory group, political consultants, and transporting large quantities of supplies to support the Vietnam War of Resistance Against Japan. September 16, 1950, under the support of the Chinese, the Vietnamese People's Army in the Vietnam-China border region to launch boundary Battle first Dongxi attack and destroy the enemy ten thousand, unplug the stronghold of the French army from the Cao Bang and Lang Son, the liberation five cities, consolidate and expand the liberated areas of North Vietnam. Since then, the Vietnamese people have a solid rear Vietnamese army mastered the military initiative in northern Vietnam, and gradually transferred to local counterattack stage.