《资治通鉴·汉纪·汉纪五十五》
曹洪生怕中计，不敢接受他们投降。荀攸说： 张因为计策不为袁绍采用，一怒之下来投奔，您有什么可怀疑的！ 
曹洪疑，不敢受，荀攸曰： 郃计画不用，怒而来奔，君有何疑！ 
Cao Hong was afraid of being tricked, so he did not dare to accept their surrender. Xun You said: "Zhang came to surrender because his plan was not adopted by Yuan Shao. What is there to be suspicious about?" 