《智囊(选录)·兵智部·赵充国》
如果羌人再提前占据险要关塞，然后严守厄塞，断绝官兵的粮道，那么对官军来说是十分不利的，必定会有伤亡危险的顾虑。
据前险，守后阨，以绝粮道，必有伤危之患。
If the Qiang people occupy the dangerous pass in advance and then guard the pass strictly, cutting off the food supply of the officers and soldiers, then it will be very unfavorable to the officers and soldiers, and there will definitely be a risk of casualties.