《资治通鉴·后梁纪·后梁纪五》
不如从山中偷偷地直抵幽州，形成和幽州城内结合的形势。如果在途中遇上敌人，我们就占据险要的地方来抵御他们。 
不若自山中潜行趣幽州，与城中合势，若中道遇虏，则据险拒之。 
It is better to sneak through the mountains and go straight to Youzhou, so that we can join forces with Youzhou. If we encounter the enemy on the way, we will occupy a dangerous place and resist them.