《新五代史·本纪·唐本纪第四》
克用军滞留一个多月不肯进兵，昭宗派延王戒丕、丹王允以兄长礼事克用，并告急。
克用军留月余不进，昭宗遣延王戒丕、丹王允兄事克用，且告急。
Keyong's army stalled for more than a month and refused to advance, so Emperor Zhaozong sent Yan Wang Jiepi and Dan Wang Yun to honor Keyong as their elder brother and request his assistance.