《资治通鉴·晋纪·晋纪四十》
如今柔然进攻我们边境，百姓又缺少粮食，如果再与刘裕为敌，发兵南下进攻晋，那么北边敌军柔然就会更加深入。那时，大军救援北方，南方的州县又将告急，这不是好计策。
今柔然寇边，民食又乏，若复与裕为敌，发兵南赴则北寇愈深，救北则南州复危，非良计也。
Currently, the Rouran are attacking our borders and are also experiencing food shortages. If we were to wage war with Liu Yu again and head south and attack Jin, the enemy force of Rouran in the north would only push further into our territory. At that time, our army would be forced to head north for relief, and the southern states and counties would again be exposed to danger. This is not a good strategy.