Answer:
The Second Opium War was a war of aggression against China jointly launched by Britain and France from October 1856 to October 1860 with the support of the United States and Russia. The purpose is for Britain and France to further open up the Chinese market and expand their aggressive interests in China. Because Britain and France launched wars under the pretext of the Yarrow Incident and the Horse Priest Incident respectively, it was called "The Arrow War" by the British. Also known as the Anglo-French expedition to China or the Second Anglo-Chinese War. At the same time, because this war can be seen as the continuation and expansion of the First Opium War (the essential purpose of the two wars is the same), it is also called the "Second Opium War".
In 1860, the Anglo-French army invaded Beijing, the Qing Emperor fled to Chengde, and the Anglo-French army broke into the Yuanmingyuan and plundered the jewelry and burned it. After the war, Tsarist Russia claimed to be "mediating and meritorious" after sending troops, and coerced the Qing government to cede more than 1.5 million square kilometers of territory, thus becoming the biggest winner. The war ended with the Qing government being forced to sign the Treaty of Beijing
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