《汉书·传·窦田灌韩传》
汉兵行数千里以求取战利，则人马疲惫，匈奴则可以逸待劳，这样做必然是很危险的。
汉数千里争利，则人马罢，虏以全制其敝，势必危殆。
If the Han soldiers march thousands of miles to seek battle, the men and horses will be exhausted, while the Xiongnu will be able to rest while awaiting our arrival, and this action will surely be very dangerous.