September 18th Incident (also known as Shenyang Incident, Fengtian Incident, Shengjing Incident, Manchuria Incident, Liutiaohu Incident, etc. ) refers to a military conflict and political event that broke out in the northeast of China on September 193 18. The two sides of the conflict are the Northeast Army of China and the Japanese Kwantung Army. The Japanese army occupied Shenyang on the pretext that China troops bombed the South Manchuria Railway built by Japan. After the incident broke out, the contradiction between Japan and China intensified, while the status of the Japanese military war faction rose, and the power of the prime minister and cabinet declined, leading to Japan's full-scale invasion of China. Within a few years, all three northeastern provinces were occupied by the Japanese Kwantung Army. September 18 was regarded as a national shame day by the people of China and the government of China.