Muhula more than justified the selection and confidence of his sovereign. In the year 1218-19 he invaded Honan, defeated the best of the Kin commanders, and not merely overran, but retained possession of the places he occupied in the Kin dominions. The difficulties of Utubu were aggravated by an attack from Ningtsong, the Sung emperor, who refused any longer to pay tribute to the Kins, as they were evidently unable to enforce the claim, and the Kin armies were as equally unfortunate against their southern opponents as their northern. Then Utubu endeavored to negotiate terms with Muhula for the retreat of his army, but the only conditions the Mongol general would accept were the surrender of the Kin ruler and his resignation of the imperial title in exchange for the principality of Honan. Utubu, low as he had sunk, declined to abase himself further and to purchase life at the loss of his dignity. The sudden death of Muhula gained a brief respite for the distressed Chinese potentate, but the advantage was not of any permanent significance; first of all because the Kins were too exhausted by their long struggle, and, secondly, because Genghis hastened to place himself at the head of his army. The news of the death of Muhula reached him when he was encamped on the frontier of India and preparing to add the conquest of that country to his many other triumphs in Central and Western Asia. He at once came to the conclusion that he must return to set his house in order at home, and to prevent all the results of Muhula's remarkable triumphs being lost. What was a disadvantage for China proved a benefit for India, and possibly for Europe, as there is no saying how much further the Mongol encroachment might have extended westward, if the direction of Genghis had not been withdrawn. While Genghis was hastening from the Cabul River to the Kerulon, across the Hindoo Koosh and Tian Shan ranges, Utubu died and Ninkiassu reigned in his stead.