Yuan Dynasty and death of Kublai Khan--from wiki

The Yuan dynasty created the "Han Army" (漢軍) out of defected Jin troops and an army of defected Song troops called the "Newly Submitted Army" (新附軍).[84]

Kublai's government faced financial difficulties after 1279. Wars and construction projects had drained the Mongol treasury.[85] Efforts to raise and collect tax revenues were plagued by corruption and political scandals.[86] Mishandled military expeditions followed the financial problems.[85] Kublai's second invasion of Japan in 1281 failed because of an inauspicious typhoon.[75] Kublai botched his campaigns against Annam, Champa, and Java,[87] but won a Pyrrhic victory against Burma.[88] The expeditions were hampered by disease, an inhospitable climate, and a tropical terrain unsuitable for the mounted warfare of the Mongols.[87][75] The Trần dynasty which ruled Annam (Đại Việt) defeated the Mongols at the Battle of Bạch Đằng (1288). Annam, Burma, and Champa recognized Mongol hegemony and established tributary relations with the Yuan dynasty.[89]

Internal strife threatened Kublai within his empire. Kublai Khan suppressed rebellions challenging his rule in Tibet and the northeast.[90] His favorite wife died in 1281 and so did his chosen heir in 1285. Kublai grew despondent and retreated from his duties as emperor. He fell ill in 1293, and died on 18 February 1294.[91]