《旧唐书·列传·卷八十二》
李抱玉探听到匪首住处，先派兵分别驻守各条山谷，又出奇兵暗暗派几百名精兵从洋州进攻草寇。
抱玉探知贼帅行止之处，先分屯诸谷，乃设奇潜使轻锐数百南自洋州入攻之。
Li Baoyu investigated and learned the residence of the leader of the bandits. He first sent soldiers to guard the various valleys. He then devised a surprise attack and secretly dispatched hundreds of elite soldiers to attack the bandits from Yangzhou.