Poland had the singular misfortune of cooperating in the extermination of the Jews and then themselves being exterminated by the Nazis as Slavic subhumans suitable only for slavery.
Let's face it, the Poles screwed up in WWII and not just because of their Holocaust enabling anti-Semitism but also as being a pathetic first challenge for the Nazi war machine...it was the 20th Century for heaven's sake—trash the biplanes and send the Calvary home!
Do you forget that Poland was also invaded by the Soviets in 1939?
The Poles may have been able to hold out longer if not for that.