《资治通鉴·唐纪·唐纪四十》
士兵们长期以河中为家，很不乐意移防他地，往往从州逃回河中。行军司马严郢主持河中留守军府事务，将他们全部抓获，杀掉为首的士兵，军心才得以稳定。
军士久家河中，颇不乐徙，往往自邠逃归；行军司马严郢领留府，悉捕得，诛其渠帅，众心乃定。
The soldiers had stayed in Hezhong for a long time and were very reluctant to move to other places, often fleeing back to Hezhong from Zhouzhou. Yan Ying, the military governor's chief of staff, was in charge of the Hezhong garrison, and he captured all of them and killed the ringleaders, which stabilized the morale of the army.