When did Henan people move to Changxing?

The migration of Henan people and Wenzhou Pingyang people to Changxing Lake, the land of fish and rice, must be an unprecedented population loss in Changxing. What caused it? The Taiping Heavenly Kingdom attacked Hangzhou, which made Nanjing empty, and then retreated to Nanjing, which was extremely difficult to manage. What is the relationship between the fall of the capital Nanjing and Changxing people? There is only one possibility, that is, the Taiping Army was defeated by Zeng Guofan's army in Hangzhou, and at that time no way back was scattered among the people in Anji Mountain area of Changxing. Manchu people were originally afraid and wary of Han people. Perhaps in history, Cixi had an unprecedented massacre in Changxing. Covered up by historians. As a result, Changxing's population plummeted and almost became an empty city. Slaughter under the pretext of clearing the Taiping Army.