《太平广记·卷一百九十·将帅二（》
到洋州青源川时，只见到处都是军旗，皇上有些害怕，说这些流着汗水的兵，一定有熟悉小路的，他们穿过了秦岭而占据了要塞。
下洋州青源川，见旌期蔽野。上心方骇，谓泚兵有谙疾路者，透秦岭而要焉。
When they arrived at the Qingshuichuan of Yangzhou, they saw military flags everywhere, and the Emperor was a little scared. He said that these soldiers who were sweating must have been familiar with the trails, and they crossed the Qinling Mountains to occupy the fortress.