Liu Yu is mostly remembered as one of greatest generals of the Northern and Southern dynasties. Under him, the Southern Chinese empire came the closest to reconquering the North. Although the territory which he won in the Northwest was quickly lost, his campaigns allowed the Southern dynasties the advantage of defending along the Yellow River, and preserved an independent Southern Chinese state long enough for the Xianbei states in the North to be assimilated, sparing China the fate of Rome, whose population was killed or enslaved by the Germans who raged across the Rhine untamed.