Mongol invasions of Vietnam

The Mongol invasions of Vietnam or Mongol-Vietnamese War refer to the three times that the Mongol Empire and its chief khanate the Yuan dynasty invaded Đại Việt (now northern Vietnam) during the Trần dynasty and Champa: in 1258, 1285, and 1287–1288. Although ultimately a failure for the Mongols, both the Trần dynasty and Champa decided to accept the nominal supremacy of the Yuan dynasty in order to avoid further conflicts.