南汉
To defeat the Southern Han army coming to supply aid to his rival, Ngô Quyền and his troops 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, thus ended SH's ambition over Annam.