Bạch Đằng River
At the Bạch Đằng River in April 1288, the Vietnamese prince Trần Hưng Đạo ambushed Omar's Yuan fleet in the third Battle of Bạch Đằng. The Vietnamese forces placed hidden metal-tipped wooden stakes in the riverbed and attacked the fleet once it had been impaled on the stakes. Omar himself was taken as a prisoner of war. The Yuan fleet was destroyed and the army retreated in disarray without supplies. A few days later, Zhang Wenhu who thought that the Yuan armies were still in Vạn Kiếp, unaware of the Yuan defeat, his transport fleet sailed into the Bạch Đằng river and was destroyed by the Vietnamese navy. Only Wenhu and few Yuan soldiers managed to escaped.