《资治通鉴·宋纪·宋纪十四》
明帝任命崔道固的侄儿崔僧为辅国将军，率军数千人从海路北上，援救历城，到达不其城时，听说历城已经沦陷，于是崔僧也投降北魏。
上以崔道固兄子僧祐为辅国将军，将兵数千从海道救历城，至不其，闻历城已没，遂降于魏。
Emperor Ming appointed Cui Seng, the nephew of Cui Dao Gu, to be the General to Aid the Country, leading thousands of soldiers northward by sea to rescue Li Cheng, but when he arrived at Buqi City, he heard that Li Cheng had already fallen. Cui Seng then surrendered to Northern Wei.
<s>[INST] Kindly elucidate the central themes in this passage in English: 上以崔道固兄子僧祐为辅国将军，将兵数千从海道救历城，至不其，闻历城已没，遂降于魏。 [/INST] Emperor Ming appointed Cui Seng, the nephew of Cui Dao Gu, to be the General to Aid the Country, leading thousands of soldiers northward by sea to rescue Li Cheng, but when he arrived at Buqi City, he heard that Li Cheng had already fallen. Cui Seng then surrendered to Northern Wei.</s>
Kindly elucidate the central themes in this passage in English: 上以崔道固兄子僧祐为辅国将军，将兵数千从海道救历城，至不其，闻历城已没，遂降于魏。
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Emperor Ming appointed Cui Seng, the nephew of Cui Dao Gu, to be the General to Aid the Country, leading thousands of soldiers northward by sea to rescue Li Cheng, but when he arrived at Buqi City, he heard that Li Cheng had already fallen. Cui Seng then surrendered to Northern Wei.
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