Sogetu's army marched north into Nghệ An; Prince Trần Kiện went over to it with 10,000 men and guided it in surprise attacks on Trần forces at Vệ Bố on 9 March and on Trần Quang Khải on 13 March, forcing the Trần out of Thanh Hóa.
Battle
Sogetu's advance into Nghệ An and Thanh Hóa
- March 1285
- Southeast Asia