Bạch Đằng River
After accepting the appeal of Kiều Công Tiễn, Liu Yan appointed his son Liu Yuancao the new Jiedushi of Tĩnh Hải quân, which was renamed as King of Giao Chỉ (Giao vương), and personally conducted the reinforcements for Kiều Công Tiễn. Before the troops of Southern Han entered the territory of Tĩnh Hải quân, Ngô Quyền got ahead by defeating and executing Kiều Công Tiễn in 938 and prepared to catch the army of Liu Yan in Bạch Đằng River. Finally Liu Yan's army was defeated in the Battle of Bạch Đằng River where his son Liu Yuancao was killed in action, the emperor of Southern Han had to abandon his military campaign and Ngô Quyền thus successfully secured the country from invaders and marked the beginning of the independence of Vietnam from Chinese authorities. After the death of Ngô Quyền in 944, Vietnam again fell into troubled times with the 12 Lords Rebellion in which Kiều Công Hãn and Kiều Thuận, grandsons of Kiều Công Tiễn, were among the principal warlords.