The nationwide War of Resistance Against Japanese Aggression was marked by Japan's full-scale aggression against China, a landmark event that can be traced back to the Lugou Bridge Incident on July 7, 1937. Located in the northwest suburbs of Beijing, Lugou Bridge is an important node of the Beijing-Zhangjiakou Railway and has important strategic significance. On July 7, 1937, the Japanese army claimed that a Japanese soldier was missing and asked to enter the Lugou Bridge to conduct a search. However, this incident may have been a deliberate provocation by the Japanese army in order to find a pretext to launch a war of aggression against China. 
During the search operation, a clash broke out between the Chinese and Japanese sides, which eventually led to a full-scale battle. After that, Japanese troops launched a further offensive on Beijing and quickly occupied large swathes of Chinese territory. This marked the beginning of a full-scale war of resistance against Japan, and a nationwide resistance in China began. 
The Lugou Bridge Incident is regarded as a symbol of China's nationwide War of Resistance Against Japanese Aggression because it marked the fullness of Japanese aggression and the collective resistance of the Chinese people to the aggression. The war lasted for eight years until Japan's surrender in 1945, officially ending World War II. In this war, the Chinese people experienced great suffering and sacrifice, but in the end they were victorious. 