《旧唐书·列传·卷五》
又命令永安王李孝基、陕州总管于筠、工部尚书独孤怀恩、内史侍郎唐俭进军攻打夏县，不能取胜，在夏县城南扎营。
又命永安王孝基、陕州总管于筠、工部尚书独孤怀恩、内史侍郎唐俭进取夏县，不能克，军于城南。
Ordered Yong'an King Li Xiaoji, Shanzhou General Yu Yun, Minister of the Ministry of Industry Duguhuaien, and Internal History Minister Tang Jian to attack Xia County, but failed to win, and set up camp in the south of Xia County.