Nanjing Massacre
The Japanese Army left most of the buildings in Nanjing destroyed by looting and arson.  They destroyed newly built government buildings as well as many civilians'  homes.  Soldiers also stole whatever they wanted.  Because the Imperial Japanese Army was so much stronger than the Chinese soldiers and civilians in Nanjing, the Chinese could not fight back.  This meant the Japanese could take all of the city's valuable things for themselves.