The Viet defectors Lê Tắc and Lê An, escorting Trần Ích Tắc's nine-year-old son behind the Yuan army, were ambushed by the Tày commander Nguyễn Thế Lộc at Nội Bàng and fled back across the border with fewer than a hundred men.
Battle
Nguyễn Thế Lộc routs Lê Tắc's column
- February 1288
- Southeast Asia