 As the Yuan forces advanced down the Red River, dispersing their power, Prime Minister Quang Khải personally launched a large counterattack that consisted more than 100 thousand troops at the Battle of Chương Dương and Vạn Kiếp, forcing Toghan to withdraw.Toghan returned without a huge loss of the army under him thanks to the Kipchak officer Sidor and his navy.In 1286, Kublai Khan appointed Trần Thánh Tông's younger brother, Prince Trần Ích Tắc, as the King of Đại Việt from afar with the intent of dealing with the uncooperative incumbent Trần Nhân Tông.