Who led the japanese army, and what happened in nanjing?

The Nanjing massacre occurred between December 1937 – January 1938.

Explanation:

Prince Yasuhiko Asaka, uncle in law to the emperor of Japan, was sent to lead Japanese forces against the Chinese during the Second Sino-Japanese War. After being defeated in Shanghai, the main Chinese army retreated to the countryside to give them an advantage over Japan. This left the city of Nanjing with limited soldiers and their civilians. The city was taken by the Japanese in one day. However, the occupation lasted 6 weeks. It is estimated that between 20,000 – 80,000 women were raped and around 300,000, mainly civilians, were killed.  

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