How did the "August 13th" Shanghai Incident break out?

1around August 9, 937, 18: 30, Captain Daiyama Yong and sailor Saito of the Japanese Marine Corps stationed in Shanghai tried to hide and drove into the cordon of Shanghai Hongqiao Airport to provoke, but the China security team failed to stop them and killed them on the spot, which is known as the "Hongqiao incident" in history. The Japanese authorities immediately made a fuss about this matter, demanding that the China government withdraw from the Shanghai security team and dismantle all fortifications. On August 10, the Japanese Lu Haijun negotiated urgently and sent troops to Shanghai, which was approved by the Cabinet. 13 at 9: 00 on August, the Japanese cabinet meeting formally determined the policy of sending troops to Shanghai and approved the case of sending troops to the army province. On the morning of the same day, the Japanese Marine Corps had an armed conflict with the China Garrison between Shanghai North Station and Sichuan North Road. Relying on Hongkou Japanese Concession, the Japanese army first attacked Tiantong 'an and Hengbang Road, and then attacked Baoshan Road, Baziqiao and Tiantong 'an with the main force, all of which were defeated by China army. Thus, the "August 13th" Shanghai Incident broke out.