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Battle at bachdang
In 937, Liu Yan (Chinese: 劉龑; Vietnamese: Lưu Nham), the Southern Han ruler, took the chance to intervene in Vietnam after the death of the Annam Lord Protector Dương Đình Nghệ. Liu Yan had been previously defeated by Dương Đình Nghệ in 931. Liu Yan placed his son, Liu Hongcao (Chinese: 劉弘操; Vietnamese: Lưu Hoằng Tháo), in command of the expedition, naming him "Peaceful Sea Military Governor" and "King of Giao." He assembled an army at Sea Gate, where he took charge of the reserve force. He ordered Liu Hongcao to embark the army and sail to Giao.
By the time Liu Hongcao arrived in Vietnamese waters with the Southern Han expedition, Liu Hongcao's plan was to ascend the Bạch Đằng River and to place his army in the heart of Giacannoto Chau before disembarking; the Bạch Đằng was the major riverine route into the Red River plain from the north.
Ngô Quyền anticipated this plan and brought his army to the mouth of the river. He had his men plant a barrier of large poles in the bed of the river. The tops of the poles reached just below the water level at high tide and were sharpened and tipped with iron. When Liu Hongcao appeared off the mouth of the river, Quyen sent out small, shallow-draft boats at high tide to provoke a fight and then retreat upriver, drawing the Chinese fleet in pursuit. As the tide fell, the heavy Chinese warboats were caught on the poles and lay trapped in the middle of the river, whereupon they were attacked by Ngô Quyền's forces.
More than half the Chinese were drowned, including Liu Hongcao. When news of the battle reached Sea Gate with the survivors, Liu Yan wept openly. He collected what remained of his army and returned to Canton. This victory ended China's long occupation of Vietnam and began a period of Vietnam's independence until the conquest by Ming China. Ngô Quyền's tactic would later be reused by Trần Hưng Đạo in a battle at Bạch Đằng River against the Mongols in 1288.