《北史·列传·卷三》
道武帝在柏肆初遭失败时，军中有人逃回来报告说，大军已经逃散了，也不知道道武帝在什么地方。
柏肆之败，军人有亡归者，言大军奔散，不知帝所在。
When Daowu Emperor was defeated at Boshi at the beginning, a deserter escaped and reported that the army had already collapsed, and that it was unknown where the Emperor Daowu was.