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 Empire the elimination of Batu's own dominance there. In the southern part of the empire, Möngke Khan himself led his army to complete the conquest of China. Military operations were generally successful, but prolonged, so the forces did not withdraw to the north as was customary when the weather turned hot. Disease ravaged the Mongol forces with bloody epidemics, and Möngke died there on 11 August 1259. This event began a new chapter in the history of the Mongols, as again a decision needed to be made on a new great khan. Mongol armies across the empire withdrew from their campaigns