Ngô dynasty

"Lady made-up", painting about Annamese woman, early 10th century

In 906 the Tang recognized Vietnam as an autonomous state, however a year later the Tang dynasty ended when Zhu Wen overthrew Tang rule establishing the Later Liang Dynasty for himself and ushering in the division of China into the short-lived empires of the Five Dynasties and Ten Kingdoms period. During this time of civil wars in China, the Khúc clan attempted to increase its power and control over Vietnam. In Guangzhou province of south China, however, the former Tang governor, Liu Yan declared himself the emperor of the emergent Southern Han kingdom.

In 917, Khúc Thừa Mỹ succeeded Khúc Hạo as Jiedushi of Tĩnh Hải Quân and reached out to the Liang Dynasty in northern China seeking political support as a vassal state. Such an action angered the Southern Han and in 930 emperor Liu Yan attempted to bring Tĩnh Hải Quân under his control by invading the capital city and taking Khúc Thừa Mỹ captive. Shortly thereafter, however, Dương Đình Nghệ, the Governor of the Ái Châu district of Tĩnh Hải Quân sent troops to rescue Khúc Thừa Mỹ, defeated the Southern Han army, and in the process appointed himself as Jiedushi of Tĩnh Hải Quân.[1] In 937, Dương Đình Nghệ was assassinated by his general Kiều Công Tiễn who declared himself loyal to the Southern Han's emperor. Immediately thereafter, Dương Đình Nghệ's son in law, general Ngô Quyền who was governing the Ái district, initiated hostilities against Kiều Công Tiễn[2]

Later Tang dynasty and Tĩnh Hải Quân, 905-938.

Ngô Quyền (897–944) was Dương Đình Nghệ's most loyal general and son-in-law. He served under Dương Đình Nghệ's command and married one of his daughters. After the murder of father-in-law, Ngô Quyền sought revenge. He launched an attack and defeated Kiều Công Tiễn in 938. The latter, before his death in battle with Ngô Quyền, sent an emissary to Southern Han court to ask for military re-enforcement. The Southern Han state's emperor then sent an army to the South land to assist Kiều Công Tiễn in 938. However, Ngô Quyền's forces were tipped off over the advancing Southern Han army and therefore he quickly mobilized his forces and strategically stationed them in key battle sites.

To defeat the Southern Han army coming to supply aid to his rival, Ngô Vương cleverly planted iron spikes underneath the Bạch Đằng River and timed the attack of the Southern Han navy. The attack began during high tide to conceal the spikes beneath the water. After the Vietnamese held the enemy in check for hours, the tides receded and the spikes impaled the Chinese armada. The Vietnamese forces followed this impalement with ferocious fire attacks, which annihilated hundreds of giant warships. The Southern Han navy and the Prince of Southern Han were killed in the battle.[3] This tactic was repeated again during the Trần Dynasty by Trần Hưng Đạo against the third Mongol invasion of 1288.

Ngô Xương Văn (吳昌文) deposed Dương Tam Kha in 950 and styled himself "Nam Tấn Vương" (南晉王) Out of respect for his uncle, Ngô Xương Văn did not have him killed, but merely demoted him and sent him into exile. Ngô Xương Văn then searched out his older brother Ngô Xương Ngập in order to share the throne with him. After arriving at the capital, Ngô Xương Ngập styled himself "Thiên Sách Vương" (天策王). Brought back by his younger brother Ngô Xương Văn to the throne, Ngô Xương Ngập soon abused his rights as the oldest son and began to rule Tĩnh Hải quân as dictator, "Thiên Sách Vương" (天策王). The country was ripe for open rivalries between different lords who fought each other to become the next successor.

After Ngô Xương Văn's death in 965, his son Ngô Xương Xí (吳昌熾) succeeded him. But as he ascended to the throne Ngô Xương Xí was faced with the daunting task of having his rule recognized by the now open rivalry between the 12 lords who fought one another as they vied for control of the country. With the announcement of his rule, the country was thrown into a chaotic period called the Thập Nhị Sứ Quân (十二使君) Rebellion.[6]