《资治通鉴·唐纪·唐纪三十五》
叛军大将杨朝宗率领步、骑兵二万将要袭击宁陵，断绝张巡的后路。
贼将杨朝宗帅马步二万，将袭宁陵，断巡后。
The rebel general Yang Chaozong led an army of twenty thousand, both cavalry and infantry, that would attack Ningling, cutting off Zhang Xun’s retreat.