《资治通鉴·唐纪·唐纪六十七》
太阳下山之时，戍卒来到任山，旅馆中空无一人，又没有米饭茶水供给，于是众士卒产生了怀疑，看见挑柴的人，抓来捆绑起来，经追问，果然获得了官军设伏的情况。
日暮，贼至任山，馆中空无人，又无供给，疑之，见负薪者，执而榜之。
At sunset, the military group arrived at Ren Shan, but the guesthouse was empty and there was no food or tea, thus the soldiers grew suspicious, and they captured and tied up the man selling firewood, and learned that the imperial court had set an ambush.