Japan was able to successfully invade the northeast of China because the Northeast Army of China bombed the railway, and the actual manipulator behind this excuse was Japan itself.

At the beginning, on the night of 193 1 September, 2008 18, under the arrangement of the Japanese kwantung army, at about 22: 20 at night, a team headed by captain Kawamoto of the Liutiaohu detachment of the railway guard, in the name of patrolling the railway, was about 7.5 kilometers north of Fengtian, that is, 800 meters north of the Northeast Army camp. It is also the case that the Japanese army used this as an excuse to start shelling Shenyang Beidaying.