Bạch Đằng River
The Mongol naval fleet were unaware of the river's terrain. Days before this expedition, the Prince of Hưng Đạo predicted the Mongol's naval route and quickly deployed heavy unconventional traps of steel-tipped wooden stakes unseen during high tides along the Bạch Đằng River bed. When Omar ordered the Mongol fleet to retreat from the river, the Viet deployed smaller and more maneuverable vessels into agitating and luring the Mongol vessels into the riverside where the booby traps were waiting while it was still high tide. As the river tide on Bạch Đằng River receded, the Mongol vessels were stuck and sunk by the embedded steel-tipped stakes. Under the presence of the Emperor Emeritus Thánh Tông and Emperor Nhân Tông, the Viet forces led by the Prince of Hưng Đạo burned down an estimated 400 large Mongol vessels and captured the remaining naval crew along the river. The entire Mongol fleet was destroyed and the Mongol fleet admiral Omar was captured.