《资治通鉴·汉纪·汉纪五十七》
曹操派司空主簿赵俨同时参预三支部队的军务，遇到事情，就从中调解开导，使他们关系逐渐和睦。
操使司空主簿赵俨并参三军，每事训谕，遂相亲睦。
Cao Cao sent the director of the Attendant’s Office, Zhao Yan, to concurrently attend to the military affairs of the three armies. When problems arose, he would mediate and appease, gradually enabling their relationships to become harmonious.