《旧唐书·列传·卷四》
当时李密刚刚打败宇文化及，有渺视王世充的情绪，不筑壁垒工事。
时密新破化及，有轻世充之心，不设壁垒。
At that time, after Li Mi had just defeated Yuwen Huaji, there was an emotional disregard for Wang Shichong, so he did not build any fortifications.