Mongol Empire Genghis. Kublai successfully took power, but civil war ensued as he sought unsuccessfully to regain control of the Chagatayid and Ögedeid families. During the reigns of Genghis and Ögedei, the Mongols suffered the occasional defeat when a less skilled general was given a command. The Siberian Tumads defeated the Mongol forces under Borokhula around 1215–1217; Jalal al-Din defeated Shigi-Qutugu at the Battle of Parwan; and the Jin generals Heda and Pu'a defeated Dolqolqu in 1230. In each case, the Mongols returned shortly after with a much larger army led by one of their best generals, and were invariably victorious. The
Mongol invasions of Vietnam third invasions occurred during the reign of Kublai Khan of the Yuan Dynasty. By this point, the Mongolian Empire had fractured into 4 separate entities with Yuan Dynasty being the strongest and biggest empire. These invasions resulted in a disastrous land defeat for the Mongols in 1285 and the annihilation of the Mongol navy in 1288. However, both the Trần dynasty and Champa decided to accept the nominal supremacy of the Yuan dynasty and serve as tributary states in order to avoid further conflicts. By the 1250s, the Mongol Empire controlled large amounts of Eurasia including much of Eastern Europe,