Lü Bu sortied out with his cavalry and charged Cao Cao's Qingzhou Corps. The Qingzhou Corps fled in terror and Cao's formations fell into disarray. Seeing the confusion, Cao Cao quickly galloped ahead, but when a fire broke out he fell from his horse and burnt the palm of his left hand. Cao's army halted before they reached camp because most of the generals had not seen their lord and feared for his safety. Cao Cao then strained himself to rouse his men, ordering that siege weapons be prepared immediately so that they can besiege Lü Bu again.