 In the southern border, Trần Quang Khải also had to retreat under the pressure of Sogetu's navy and the defection of the governor of Nghe An.Despite the repeated problems, the royal family and royal court of the Trần dynasty still kept their harmony and determination owing to accurates decisions and actions from the leaders Thánh Tông, Nhân Tông, Trần Quốc Tuấn and Trần Quang Khải.The critical situation of the Trần dynasty began to change after their victory in Battle of Hàm Tử in April 1285 where the troops commanded by Trần Nhật Duật, Prince Chiêu Thành, Trần Quốc Toản and Nguyễn Khoái were finally able to defeat the fleet of Admiral Sogetu.