What does "9. 18" mean?

"9. 18" is the September 18th Incident, also known as the Fengtian Incident and the Liutiaohu Incident.

1931September 18 night, the Japanese kwantung army, entrenched in the northeast of China, blew up the Japanese South Manchuria railway track built by the railway "guard" near Shenyang Liutiao Lake and blamed it on the China army. Using this as an excuse, the Japanese army shelled the North Camp of the Northeast Army in China, creating the "September 18th Incident" that shocked China and foreign countries.

The next day, the Japanese army invaded Shenyang and successively invaded the three northeastern provinces. 1February 932, the whole northeast fell. Since then, the Japanese puppet Manchukuo regime was established in the northeast of China, and began to enslave and colonize the people in the northeast for 14 years, making more than 30 million compatriots in the northeast suffer from conquered people.

Background of 9 18:

After World War I, Japan's expansion in China was restrained by the British and American powers, and China's Northern Expedition weakened Japan's interests in China, prompting the Japanese government to adjust its China policy and accelerate the pace of annexing Northeast China. In the early 1930s, the world economic crisis broke out, and Japan's economy suffered heavy losses, which led to a political crisis.

In the case of domestic troubles and foreign invasion, the Japanese fascist forces are determined to break through the shackles of the Washington system on Japan, and seize the Northeast when Britain and the United States are busy coping with the crisis and Chiang Kai-shek is "suppressing * * *" on a large scale, so as to get rid of the predicament and try to compete for hegemony in the world.

Reference to the above content: Baidu Encyclopedia-September 18th Incident