《魏书·列传·卷三十五》
皇帝诏令卢昶说： 彭宋靠近边疆，地势紧连淮海，以威力防御之术，实在不易成功。
诏昶曰： 彭宋地接边疆，势连淮海，威御之术，功在不易。
The emperor issued an edict to Lu Chang, saying: Pengsong was close to the frontier and contiguous with Huaihai. It was difficult to succeed if the prestige and strategy of defense were used. 