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I must admit that my knowledge of specific events in 472 CE, particularly regarding Yucheng's attack on the Northern Wei across the western border, is limited. The Northern Wei dynasty (386-534 CE) was a significant period in Chinese history, marked by the consolidation of power by the Tuoba clan of the Xianbei people and the eventual sinicization of their rule. However, detailed records of specific military campaigns, especially those involving smaller or less-documented factions like Yucheng, are scarce.
If Yucheng refers to a regional power or a local leader, it is possible that this event was part of the broader struggles between the Northern Wei and various nomadic or semi-nomadic groups along their western borders. The Northern Wei faced frequent incursions and rebellions from such groups, as well as from rival Chinese states during this period. These conflicts were often tied to the complex dynamics of power, trade, and territorial control in the region.
If you have more context or specific sources about this event, I would be happy to help interpret or expand on it further! Otherwise, I recommend consulting primary sources like the Book of Wei (Wei Shu), which is part of the official histories of the Northern Wei, or secondary scholarly works on the period for more detailed information.