《资治通鉴·隋纪·隋纪五》
来护儿闻知宇文述等人大败，也率军退回，只有卫文升军独以保全。
来护儿闻述等败，亦引还。唯卫文升一军独全。
When Lai Hu’er learned that Yuwenshu and others were defeated, he also led his troops to retreat, and only Wei Wensheng's troops survived.