Is this description wrong by ten years? 1936 were already fightings with Japan, the full war started 1937. Communists in Shanghai were already eradicated, the communists were at the north-west at the time, tried to avoid complete destruction by Chiang Kai-shek. Ten years before would match the general description more, this was the time of communist crackdown by the Kuomintang:
http://en.wikipedia.org/wiki/Shanghai_massacre_of_1927







