tried to slay Wang Ping； but Wang Ping escaped to his own camp。 In the night； Wang Ping set fire on both camps； and great confusion reigned in the lines。 Xu Huang ran away； but Wang Ping crossed the river and surrendered to Zhao Yun； who led him to Liu Bei。 Wang Ping told Liu Bei all about River Han and the country near by。
〃I shall surely capture Hanzhong now that you are here to help me； friend Wang Ping；〃 said Liu Bei。
Liu Bei made Wang Ping General and Army Guide。
Xu Huang reported Wang Ping's defection； which made Cao Cao very angry。 Cao Cao placed himself at the head of a force and tried to retake the bank of the river。
Zhao Yun； thinking his troops too few； retired to the west side； and the two armies lay on opposite sides of the stream。 Liu Bei and his adviser came down to view the position。 Zhuge Liang saw in the upper course of the stream a hill which might well screen a thousand soldiers。
So Zhuge Li