《资治通鉴·宋纪·宋纪四》
北魏安南大将军司马楚之上疏，认为北魏四方邻国都已经平定，请求朝廷出兵大举进攻刘宋。拓跋焘则认为连年征战，将士们早已疲劳不堪，没有同意。
司马楚之上疏，以为诸方已平，请大举伐宋，魏主以兵久劳，不许。
Northern Wei's great general of pacifying the south, Sima Chuzhi, memorialized that all the neighboring countries around Northern Wei had already been pacified, and requested that the court dispatch troops to attack Liu Song in a major offensive. Tuoba Tao, however, believed that, after years of continual warfare, the soldiers were already exhausted, so he did not approve.