《资治通鉴·唐纪·唐纪六十八》
春季，正月，唐天平军上奏朝廷，宣称已经派遣将士张晏等人往沂州救授，大军归还时，来到义桥，闻知北方又有盗贼起事，于是留下来捍卫，张晏等人不服从命令，大喊大闹前往郓州。
春，正月，天平军奏遣将士张晏等救沂州，还，至义桥，闻北境复有盗起，留使扞御。晏等不从，喧噪趣郓州。
Spring, the first month, the Tang Tianping Army reported to the court, claiming that they had sent soldiers led by Zhang Yan to rescue Yizhou. When the army returned, they arrived at Yiqiao and learned that bandits had risen in the north. They stayed there to defend against them, but Zhang Yan and his men refused to obey orders and shouted and went to Yuzhou.