This question examines the September 18th Incident. As far as I know, on September1931kloc-0/8, Japan made trouble and provoked the September 18th incident. Zhang Xueliang retreated without a fight, and Japan subsequently occupied the three northeastern provinces. According to the key words of September 18th and Beidaying, this ballad reflects the September 18th Incident, not the Lugouqiao Incident. So the Lugouqiao Incident was changed to the September 18th Incident.