 On May 10 of lunar calendar 1285, Trần Quang Khải fought the decisive battle in Chương Dương where Sogetu's navy was almost destroyed and therefore the balance in battlefield titled definitely in favour of the Trần dynasty.10 days after Sogetu was killed and Trần's Emperor Nhân Tông and Retired Emperor Thánh Tông returned to capital Thăng Long on June 6 of lunar calendar, 1285.In March 1287, the Yuan dynasty launched their third invasion of Đại Việt.