Zhang Bao was commanding some eighty thousand troops. The rebel had led his army to a strong position in the rear of the hills. An attack being decided upon, Liu Bei was the van leader. On the rebel side a general of Zhang Bao, Gao Sheng, came out to offer battle. Liu Bei sent Zhang Fei to smite Gao Sheng. Out rode Zhang Fei at full speed, his spear ready set. After a few bouts Zhang Fei wounded Gao Sheng, who was unhorsed. At this Liu Bei signaled the main army to advance. Then Zhang Bao, while still mounted, loosened his hair, grasped his sword, and uttered his incantations. Thereupon began the wind to howl and the thunder to roll, while a dense black cloud from the heavens settled upon the field. And therein seemed to be horsemen and footmen innumerable, who swept to attack the imperial troops. Fear came upon them, and Liu Bei led off his troops, but they were in disorder and returned defeated.