Afta

Hi everyone
Is there anyone can tell me about the communist party at the war time in China?
I'm not Chinese but I'm curious about the plot in drama, the focus attention is in communist party despite war against Japanese, are they (communist party) more threaten than Japanese invasion? And as we can see, the purpose for the party is to depend the nation, same with government at that time
Thankyou if there is a kind soul that can elaborate