The Red Army quickly achieved its targets , vastly outnumbering Polish resistance , already reeling from the German blows .
On 1 September , the Germans invaded Poland from the west ; and on 17 September , the Soviet Red Army invaded Poland from the east .
The Soviet Red Army   quickly achieved Poland 's targets , vastly Poland Polish resistance , already reeling from Germans German blows .
On 1 September , the Germans invaded Poland from the west ; and on 17 September , the Soviet Red Army invaded Poland from the east .