 Mongol invasions of Vietnam

The Mongol invasions of Vietnam or Mongol-Vietnamese Wars refer to the military campaigns launched by the Mongol Empire, and later the Yuan dynasty, against the Trần dynasty in Đại Việt (modern-day northern Vietnam) and the Champa (modern-day southern Vietnam) in 1258, 1282–1284, 1285, and 1287–88.In studies of China and the Mongols, the campaigns are often treated as a success due to the establishment of tributary relations with Dai Viet despite the Mongols suffering several military defeats.