《北史·列传·卷六十六》
突厥人入境，就抓起来杀了。突厥人自此销声匿迹，不敢在塞下放牧。
突厥入境，辄禽斩之，自是屏迹，不敢畜牧于塞下。
When the Turks crossed the border, he had them seized and killed. The Turks then disappeared without a trace, not daring to graze near the border.