Maybe you've been confused by some of the resistance fighters wearing German helmets?
The Germans crushed the uprising because the Soviets conveniently stopped their advance, giving the Germans time to focus on the Polish resistance, which was convenient for the Soviets because it eliminated a potential "problem" for the Soviet occupation of Poland after WW2.
Please educate yourself:
https://en.wikipedia.org/wiki/Warsaw_Uprising
Maybe you've been confused by some of the resistance fighters wearing German helmets?
The Germans crushed the uprising because the Soviets conveniently stopped their advance, giving the Germans time to focus on the Polish resistance, which was convenient for the Soviets because it eliminated a potential "problem" for the Soviet occupation of Poland after WW2.