9. 18 Incident 1930, the world capitalist economic crisis spread to Japan. In order to transfer the increasingly fierce domestic class contradictions, the Japanese accelerated the pace of military aggression against China, and in July and August of 193 1, the Wanbaoshan Incident and the Nakamura Incident were created in the northeast. /kloc-In September of 0/8, the Japanese created the "Wicker Lake Incident" and launched a war of aggression against northeast China.

The third Saturday in September is National Defense Education Day. 2001August 3 1 day, the 23rd meeting of the 9th the National People's Congress Standing Committee (NPCSC) decided to establish a national defense education day, and the third Saturday of September every year was designated as the national defense education day. This is the first theme festival in China that clearly stipulates national defense education in legal form. According to this decision, September 2006 1 day was the first national defense education day.