《新五代史·列传·唐臣传第十三》
契丹包围幽州，这时晋和梁在黄河边相持不下，想派兵救幽州，兵力太少，如果不救，又怕失去幽州。
契丹围幽州，是时晋与梁相持河上，欲发兵，兵少，欲勿救，惧失之。
Qidan besieged Youzhou. Jin and Liang confronted each other at the Yellow River. Jin wanted to send troops to rescue Youzhou, but didn't have enough troops. Jin didn't rescue Youzhou, but was afraid of losing it.