Japanese forces attack Shanghai.

The January 28 incident or Shanghai incident was a conflict between the Republic of China and the Empire of Japan. In apparent response to a mob attack on Japanese Buddhist monks, the Japanese in Shanghai rioted and burned down a factory, killing two Chinese. Heavy fighting broke out, and China appealed to the League of Nations. A truce was finally reached on May 5, calling for Chinese military withdrawal, and an end to Chinese boycotts of Japanese products. It is seen as the first example of a modern war waged in a large city between two heavily equipped armies and as a preview of what was to come during the Second World War.