Changes in Shanhaiguan

Hong Chengchou, the governor of the Ming Dynasty, was defeated in Shanhaiguan and was persuaded to surrender; General Wu Sangui led Qing troops into the pass here. A few years later, because Emperor Kangxi wanted the vassal king Wu Sangui to return to Shanhaiguan to garrison, Wu Sangui rebelled and proclaimed himself emperor. He once occupied most of China south of the Yangtze River and formed a confrontation with Emperor Kangxi, which was almost successful. This book briefly describes this historical story.