《资治通鉴·唐纪·唐纪三十五》
叛军全力攻城，张巡亲自督战，勉励将士，昼夜与叛军苦战，有时一天交战二十多次，共激战十六日，俘虏叛军将领六十多人，杀死叛军士卒二万多，士气大振。
贼悉众逼城，巡督励将士，昼夜苦战，或一日至二十合；凡十六日，擒贼将六十馀人，杀士卒二万馀，众气自倍。
The rebels launched an all-out attack on the city, Zhang Xun supervised the battle personally, encouraged the officers and soldiers, and fought fierce battles with the rebels day and night. Sometimes they fought more than 20 times a day, and in the course of 16 days, they captured more than 60 rebel generals, killed more than 20,000 rebel soldiers, and greatly boosted morale.