How did Vietnam break away from China in history?

Vietnam originally belonged to the Chinese lineage and belonged to the central government before the Five Dynasties and Ten Kingdoms. After the Five Dynasties and Ten Kingdoms, Vietnam gradually separated from the central government and became independent for hundreds of years. During the reign of Emperor Yongle of the Ming Dynasty, Hu Ji captured the Chen Dynasty. Chen Tianping, the surviving minister of the Chen Dynasty and the son of the king of Chen Dynasty, requested the Ming Dynasty to send troops. Emperor Yongle accepted the request and sent five thousand troops to escort these people back to Vietnam. Unexpectedly, they were killed by the Vietnamese army on the way back. In addition, Vietnam invaded neighboring countries without authorization, and the kings of neighboring countries also requested that troops be sent to seek justice. The enraged Emperor Yongle decided to formally send troops. The Ming army quickly captured the "Eastern Capital (Hanoi)" and the Western Capital, and went south to pursue Hu Ji and his son, capturing them and taking them to Nanjing.

After the war, Emperor Yongle established three departments in Annan: the Commanding Department, the Chief Secretary, and the Administrative Department. And established prefectures, states, and counties for direct rule. After more than 420 years of separation, Vietnam finally returned to the embrace of its motherland. By the time of Xuanzong of the Ming Dynasty, resistance among the Vietnamese people was rising one after another, and the emperor had no choice but to recognize his independence. But nominally China is his suzerain country. .