《资治通鉴·唐纪·唐纪三十九》
镇西节度使马听说代宗逃往陕州，便率领一千多名精锐骑兵从河西前来救援。马一路转战来到凤翔，正好遇上吐蕃军队围城。
吐蕃还至凤翔，节度使孙志直闭城拒守，吐蕃围之数日。
The Zhenxi (Pacification of the West) Circuit governor Ma heard that Emperor Daizong had fled to Shaan Prefecture, and led more than a thousand elite cavalry from Hexi to the rescue. Ma fought all the way to Fengxiang, just in time to encounter the Tibetan army besieging the city.