《汉书·传·李广苏建传》
等到出兵攻打匈奴时，李广行军没有严格的编制、队列和阵势，靠近良好的水源草地驻扎下来，住宿停留，人人自便，晚上不敲刁斗巡逻来自卫，军部的文书簿籍一概从简，但是也在远处布置了侦察岗哨，没有遭遇过危险。
及出击胡，而广行无部曲行陈，就善水草顿舍，人人自便，不击刁斗自卫，莫府省文书，然亦远斥候，未尝遇害。
When they went to fight against the Xiongnu, Li Guang’s army didn’t have strict formations and rules, and they would just stop wherever they found a good source of water and grass and camp. They all did what they wanted to do, they did not patrol at night, and the military offices were simple and informal. However, they did station scouts and lookouts in the distance, and they were never attacked.