《史记·八书·封禅书》
第二年，匈役数次侵入边境，汉朝发兵守卫，此后几年收成少差一些。
明年，匈奴数入边，兴兵守御。後岁少不登。
The next year, the Xiongnu invaded the border several times. The Han Dynasty sent troops to defend, and the harvests in the following years were slightly worse.