At midnight Trần Thái Tông and the crown prince sailed up from Thiên Mạc in war boats and fell on the careless Mongol camp at Đông Bộ Đầu; badly beaten, the Mongols abandoned Thăng Long and retreated along the Thao river.
Battle
Battle of Đông Bộ Đầu
- 28 January 1258
- Southeast Asia