Was Viet Nam a part of China before? If so, which dynasty was it?

Yes, during the Qin, Han, Sui and Tang Dynasties, Viet Nam was the territory of China.

After Qin Shihuang unified the six countries, in 2 14 BC, he sent troops across Lingnan, occupied today's Guangxi, Guangdong and Fujian, and conquered the local Baiyue tribe. The Qin Dynasty immigrated a lot in this area and established three counties, in which the northern part of Vietnam (Luoyue) was under the management of Xiang County.

The world was in chaos at the end of Qin dynasty. In 203 BC, Zhao Tuo, commander-in-chief of the South China Sea in Qin Dynasty, established himself as the King of South Vietnam (later renamed as "Emperor Wu of South Vietnam"), with his capital in Guangzhou today. North-central Vietnam became a part of South Vietnam.

In BC 1 1 1 year, Emperor Wu of the Han Dynasty destroyed South Vietnam and established three counties, namely Jiaotoe, Jiuzhen and Rinan, in northern and central Vietnam. /kloc-For more than 0/000 years, the north-central part of Vietnam has been the direct territory of China's successive dynasties (Han Dynasty, Soochow, Jin Dynasty, Southern Dynasty, Sui Dynasty, Tang Dynasty and Southern Han Dynasty), which is called "Northern Dependency Period" or "County Period" in Vietnamese history.

At the end of the Eastern Han Dynasty (A.D. 192), today's Zhanren area in central Vietnam even killed the Xianglin County Order in Hinan County of the Han Dynasty, occupied a part of the original Hinan County, took Brahmanism as the state religion, and established Linyi State (later called Champa State) with Hue as the boundary in the Eastern Han Dynasty. During the Sui Dynasty, Yang Di sent troops to destroy the country and set up three counties. During the Tang Dynasty, the country was revived, and China was bounded by Mount Hengshan. From 1 190 to 1220, Zhanpo was occupied by Zhenla, and China was later restored.

/kloc-in the 20th century, China entered the Five Dynasties and Ten Kingdoms period, and Vietnam (then called Annan) took advantage of the fragmented situation in China and got rid of China's control.

Extended data:

In 930 AD, Liu Lipai, the monarch of the Southern Han Dynasty, sent Li Shouyi and Liang Kezhen to crusade against toe-crossing, and fled to Khuc Tuha My via the Jinghai. But soon, the Qu family department expelled the Nanhan army, claiming that our time was in Jinghai. ?

In 937, Duong Dinh Nghe was killed by General Kieu Cong Tien. In 938, Duong Dinh Nghe's son-in-law, Wu Quan, fought Kieu Cong Tien in Aizhou (now Tsinghua). Kieu Cong Tien saw that Wu Quan was very powerful, so he turned to Nan Han for help.

Liu Li had already had the ambition to annex Jiao Jiao, so he took the opportunity to appoint his son Liu Hongcao as our special envoy to the Jinghai, made him king, and led the water army to send troops to Jiao Jiao in the name of supporting Kieu Cong Tien. Ada personally stationed troops in Haimen (now Bobai County, Guangxi), and Haimen was Liu Hongcao's successor.

Xiao Yi, the envoy of Chongwen in the Southern Han Dynasty, thought that this solar term was rainy and the road was difficult. He suggested that Liu Li temporarily slow down the pace of invasion and lead the way with a village guide. However, Liu Li did not listen, and still ordered Likas to command the invasion of the water army and enter the Baiteng River from Haikou (Halong Bay).

At this point, Wu Quan has breached Luocheng (C? Loa), kill Kieu Cong Tien. Knowing that the South Han Army had arrived at Baiteng River, he ordered the sergeant to cut down trees, make wooden stakes, and wrap sharp iron sheets on the top of the stakes. Wu Quan inserted these stakes in the center of the dangerous river where Baiteng River entered the sea, and set an ambush along the river bank.

Due to the high tide, the Baiteng River rose and flooded these stakes. Wu Quan immediately ordered his men to lead the water army to challenge the South Han Army. South Han water army attacked, and Wu Jun pretended to be defeated. Liu Hongcao really ordered the South Han Army to pursue and reach the ambush site of Wu Jun.

The defeated Wu Jun rose from the dead. Soon after, the river receded and all the stakes under it were exposed. Many large ships in South Korea were pierced through the bottom of the ship and sank one after another, and many soldiers drowned. Wu Quan's ambush was everywhere. He took the opportunity to attack the Nanhan Army by boat and started hand-to-hand combat with it.

The southern Han army was defeated, losing more than half, and the main commander Liu Hongcao was killed. Ada, the monarch of the Southern Han Dynasty, learned that Liu Hongcao had died in battle, and wept bitterly, leading down archers to return home.

After Wu Quan defeated the army of the Southern Han Dynasty, he became king in 939 and established the Wu Dynasty, the capital of Guluo (C? Loa). Since then, Nanhan stopped attacking from the south. But Vietnam (Jiaotuo) began to develop independently. In 968, with the establishment of the Ding Dynasty, Viet Nam officially became independent from China.

Baidu Encyclopedia-Vietnam

Baidu Encyclopedia-Battle of Baiteng River