 In December 1284, the second Yuan invasion of Đại Việt was opened under the command of Kublai Khan's prince Toghan.Đại Việt was attacked in two directions, Toghan himself conducted the infantry invaded from the northern border while the Yuan navy under general Sogetu advanced from the southern border through Champa's territory.In the beginning of the war, Thánh Tông and Nhân Tông had to order the army retreat to avoid the pressure from the Yuan force when Prince Chiêu Minh Trần Quang Khải commanded troops try to stop Sogetu's fleet in the Nghệ An Province.