《资治通鉴·宋纪·宋纪十四》
北魏尉元上书朝廷说： 彭城是贼寇的重要基地，如果不驻防重兵，储存粮草，就不能守住。如果军用物资丰富，就是刘出动全部军队，也不敢窥伺淮北之地。 
魏尉元上表称： 彭城贼之要籓，不有重兵积粟，则不可固守；若资储既广，虽刘彧师徒悉起，不敢窥淮北之地。 
Wei Yuan, the Minister of Northern Wei, wrote to the imperial court and said: Pengcheng is an important base for the bandits, and if heavy troops are not stationed and food and grass are not stored, it will not be possible to defend it. If military supplies are abundant, even if Liu sends all his troops, he would not dare to spy on Huaibei. 