《新唐书·列传·卷十五》
随同秦王屯驻于柏壁，率精兵二千人从隰州直趋西河，截断贼寇退路。
从秦王屯柏壁，以劲卒二千繇隰州趋西河，蹑贼归路。
He stationed together with King Qin at Bo Bi, and led two thousand crack troops to go directly from Xizhou to Xi He, to cut off the enemy’s retreat.