After the destruction of the Kin dynasty the Mongols disregarded their agreement with the Sung sovereign and yielded up merely a small part of Honan, a southeastern bit of that province, joining all the rest to their own immense Empire. Chao fan and Chao kwe, two Imperial princes, were indignant at this perfidy, and explained to their Emperor, that the Hoang Ho was the true northern boundary of the Empire, to which southern Shen si should be added; they urged the need of using force to win that which had been refused them, that which was theirs, both by right and agreement. They must regain their ancient capitals: Pien king, Lo yang, and Si ngan fu. Members of the council declared that this policy would bring back the Mongols, that it would be disastrous to send warriors from afar to hold ruined cities which they would have to provision, moreover the Empire lacked money, trained troops, and good generals. The Emperor Li tsong was deaf to these arguments, and gave command promptly to march on Pien king with a corps of ten thousand. Meanwhile Tsui li, who had given Pien king to the Mongols, was made master in that capital. The three chiefs, who served under him, were so incensed at his arrogance, that they swore to destroy the vile traitor. The moment these men heard that a Sung general was advancing with an army they declared to him their submission by letter, feigning meanwhile to work in accord with Tsui li the deceiver and tyrant. To carry out their plot better Li po yuan, one of the three, had fire set to a gate of the city, Tsui li hurried to the place and when he arrived there Li po yuan, who had gone with him, plunged a dagger blade into his body so deftly that Tsui li fell from his horse and died near the feet of the animal. Soldiers posted at the gate for the purpose attacked the attendants of the dead man and finished them promptly. Tsui li’s body was tied to the tail of a horse and dragged to the palace, where Li po yuan spoke to the people in these words: “Tsui li was a murderer, a robber, a tyrant, a debauchee, and an infamous traitor. No man so evil as he has lived in old times, or in our day. Did he merit death?” “To chop such a man into bits while alive would be very small punishment!” shouted out thousands. His head was exposed to the people and his body was made a burnt offering to the spirit of Nin kia su, the late Emperor. Tsuan tse tsai, the Sung general, occupied Pien king, and his force was strengthened soon by another of fifty thousand. From these two armies reinforcements were sent to Lo yang without waiting.