《资治通鉴·唐纪·唐纪三十七》
这时都知兵马使仆固怀恩说： 九节度使邺城之败时，郭将军先领兵退却，朝廷责罚元帅，所以罢了他的兵权。
都知兵马使仆固怀恩曰： 鄴城之溃，郭公先去，朝廷责帅，故罢其兵柄。
At this time, Pu Gu Huai En, the envoy of the Department of Soldiers and Horses, said: When the army of the nine Dukes was defeated in Yecheng, General Guo led the army to retreat first. The court punished the marshal and therefore deprived him of his military power.