1645, jiangyin people fought bloody battles with the Qing army for 81 days in order to resist the order of the Qing dynasty to shave their hair. When the city was broken, Yan Yingyuan wrote on the city gate: Eighty days, to show his loyalty to the people of the 17th Dynasty, 100,000 people died together to stay in Daming for three hundred miles. After the city was broken, the Qing army slaughtered the city and no one surrendered.