《后汉书·列传·南匈奴列传》
在此以前朔方以西的堡垒要塞大多没有修复，因此鲜卑多次入侵南部，杀害了渐将王。
先是，朔方以西障塞多不修复，鲜卑因此数冠南部，杀渐将王。
Before this, the forts and strongholds west of Shuofang had mostly not been repaired, so the Xianbei invaded the south several times and killed the King of Jianjiang.