《后汉书·列传·马援列传》
回来后一个多月，恰逢匈奴、乌桓侵犯扶风，马援以三辅侵骚，园陵危逼，请求出兵，被准许。
还月余，会匈奴、乌桓寇扶风，援以三辅侵扰，园陵危逼，因请行，许之。
A month after returning, when the Huns and Wuhans invaded Fufeng, Ma Yuan requested to send troops because Mafu was invaded and Yuanling was in danger, and he was granted permission.