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Hmm, The fall of Heyin City in Wei Country doesn't count.
Although the city was nominally Wei's Eastern Capital, in reality, the Wei Monarch had never visited there; it was merely a name, managed as a capital in name only.
This is very different from Xinzheng City, which has always been treated as the core of a nation and of a prefecture.
The fall of Xinzheng City and the flight of the Zheng Monarch became a turning point in the Chu State's campaign in Yuzhou.
As the news spread, the Zheng Prefectures and Counties around Xinzheng City that were still holding out began to waver, and the people's spirits were scattered.
When our Chu army cleared up the aftermath in Xinzheng and began to send troops to nearby cities, all the towns we passed surrendered at the sight of us.
Some Prefectures and Counties even sent Messengers to offer their submission before our Chu army arrived, switching to the Chu flag in advance.