Comment by qwytw

https://en.wikipedia.org/wiki/Katyn_massacre

I don't think there was any going back from this...

The core of the Polish Home Army was made up of people belonging to the same social groups and their relatives or associates.

By 43-44 there were even a few cases of a limited truce or even some minor cooperation between the Germans and the Polish resistance since the Soviets turned on them immediately after entering (former) Polish territory in the east.