《旧唐书·本纪·卷十》
平原太守颜真卿因为粮食已尽援助断绝，弃城渡过黄河而逃。就这样，河北郡县全部陷入贼手。
平原太守颜真卿以食尽援绝，弃城渡河，于是河北郡县尽陷于贼。
Yan Zhenqing, the prefect of Pingyuan, abandoned the city and crossed the Yellow River because the food had run out and support had been cut off. In this way, all the counties in Hebei fell into the hands of the rebels.