《资治通鉴·唐纪·唐纪三十五》
张巡于是率兵撤出雍丘，向东坚守宁陵，抵抗叛军，这时张巡才与睢阳太守许远见面。
巡遂拔雍丘，东守宁陵以待之，始与睢阳太守许远相见。
So Zhang Xun led his troops to withdraw from Yongqiu and to the east to defend Ningling and resist the rebel army; it was at this time that Zhang Xun finally met Xu Yuan, the Chief Administrator of Suiyang.