 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 general Sogetu.On May 10 of Lunar calendar 1285, Trần Quang Khải fought the decisive battle in Chương Dương where Yuan's navy was almost destroyed and therefore the balance in battlefield titled definitely in favour of the Trần dynasty.