《后汉书·列传·马援列传》
第二年秋，马援就率三千骑出高柳，行雁门、代郡、上谷等边塞。
明年秋，援乃将三千骑出高柳，行雁门、代郡、上谷障塞。
In the autumn of the following year, Ma Yuan led three thousand cavalry out of Gaoyiu, passing through Yumen, Daijun, Shanggu and other border areas.