《汉书·传·张骞李广利传》
张骞以校尉的身份跟随大将军卫青出击匈奴，因为他了解水草分布的地方，军队才能不缺给养，于是封张骞为博望侯。
骞以校尉从大将军击匈奴，知水草处，军得以不乏，乃封骞为博望侯。
Zhang Qian had followed the Grand General Wei Qing on a campaign against the Xiongnu as a lieutenant commander, and because he knew where water and grass could be found so that the army did not run short of supplies, he was ennobled as Marquis of Bowang.