Those of his adherents whom Tung Cho had left to guard his city fled when their master was slain and went into Shênsi. Thence they sent in a memorial entreating amnesty. But Wang Yün would not hear of it. Four of them were the chief instruments of Cho’s aggressions. Now though a general amnesty were proclaimed these men should be excluded from its benefit. The messenger returned and told the four there was no hope of pardon and they could only flee. Adviser Chia Hsü said, “If we throw away our arms and flee singly then we shall fall easy victims to any village beadle who may seize us. Rather let us cajole the Shênsi people to throw in their lot with us and make a sudden onslaught on the capital and so avenge our master. If we succeed, we control the court and the country. It will be time enough to run away if we fail.” The plan was adopted and they spread abroad the story that Wang Yün intended to harry the district. Having thus thrown the people into a state of terror they went a step farther and said, “There is no advantage in dying for nothing. Revolt and join us.” So they cajoled the people into joining them and gathered a host equal to ten legions. This horde was divided into four parts and they all set out to raid the capital. On the way they fell in with a son-in-law of their late chief, with a number of soldiers. He had set out to avenge his father-in-law and he became the van-leader of the horde. As they advanced the news came to Wang Yün and he consulted Lü Pu. “They are a lot of rats,” said he. “Never mind how many there are of them. Be not in the least anxious.” So Lü Pu and Li Su went to oppose them. The latter was in advance and met Niu Fu. They fought; Niu Fu was outmatched and retired. But unexpectedly Niu Fu returned in a night attack, found Li Su quite unprepared and drove his force some thirty li, slaying many. Li went to tell his chief who raged at him saying, “You have sullied my reputation as a warrior and destroyed my prestige.” And he put Li Su to death, exposing his head at the camp gate. Next day Lü Pu advanced his own force and engaged Niu Fu. Could the result be the least dubious? Niu Fu was driven off. That night he called in his friend Hu Chʻih-êrh to advise him. “Lü Pu is too doughty a fighter for us to hope to overcome him. Our case is hopeless. Our best course is to desert these four men, secrete our valuables and leave the army with just a few of our followers.” The plan of Niu Fu was adopted and the two traitors that very night packed up and made their way out of camp. They were only half a dozen. They came to a river and, while crossing, Hu Chʻih-êrh, tempted by the lust of wealth, slew his companion. Then he went to offer the head to Lü Pu. Lü Pu enquired into the matter and when a follower told him the truth, he put the double traitor to death.