《北史·列传·卷四十二》
军队到达西部边境。有一座柏谷城，是敌人占领的十分险要的地方，北齐的将领都不敢包围攻打，段韶说 ：汾水以北黄河以东，一直是我们的领土。
行达西境，有柏谷城者，敌之绝险，诸将莫肯攻围。
The army reached the western border. There was a city of Bagu, which was a very dangerous place occupied by the enemy. The generals of the Northern Qi did not dare to surround and attack. Duan Yu said: "North of the Fen River and east of the Yellow River have always been our territory."