On this day, 185 years ago, July 5, 1840 (June 7, 1840 in the lunar calendar), the first Opium War: the British fleet bombarded Dinghai County on the Zhoushan Islands in China. The First Opium War broke out. On July 5, 1840, the British fleet bombarded Dinghai County on the Zhoushan Islands of China, and the First Opium War broke out. The First Opium War was the beginning of China's modern history. After "closing the country to the outside world", China lags behind the world tide. In order to reverse the trade deficit with China, Britain began to smuggle opium into China to make huge profits. In order to open the door to the China market, Britain launched a war of aggression on the pretext of selling cigarettes at Lin Zexu's Humen in June 1839. Later, after the war was unfavorable, Emperor Daoguang sent Qi Shan, governor of Zhili, to negotiate peace with Britain and signed the first unequal treaty in China's history, the Treaty of Nanjing. For the first time, China ceded territory, made reparations, and negotiated tariffs to foreign countries, seriously endangering China's sovereignty. It reduced China to a semi-colonial and semi-feudal society and promoted the disintegration of the natural economy. Humen cigarette sales and the Opium War opened a new chapter in the history of modern China people's resistance to foreign aggression.