Bạch Đằng River
In early 981, two Song armies attacked Đại Việt through land, and another naval fleet strike through the Bạch Đằng River. Lê Hoàn's naval military fought the Song fleet on the river, but were greatly outnumbered and forced to retreat. The victorious Song fleet captured and beheaded 1,000 Vietnamese sailors and seized 200 junks. Then Lê Hoàn switched the army to the north, endeavouring to stop the Song land force by ambushing the Song army in Chi Lăng (near modern-day Lạng Sơn). The ambush was successful with two Chinese generals captured and half of the Song force killed. As a result, the Song naval forces were forced to withdraw and the Song invasion ended in April 981.