《资治通鉴·唐纪·唐纪六十七》
当时自桂州归还的戍卒距彭城只有四个驿程，共一百二十里路程，这使徐州城内惶然，一片恐惧。
时戍卒拒彭城止四驿，阖城忷惧。
At that time, the stationed soldiers back from Guizhou were only four stages away from Pengcheng, and it was one hundred and twenty li of roads, which made Pengcheng panicky and fearful.