Learn history. Poland attacked Germany first. Poland committed mass murders of Germans in Poland before Adolphus rightfully sent Germany into Poland to stop it and render justice. I don't have any German in me, but I still know this is true and I speak it with no bias.
^^^^^This.
And remember, Poland lined up at Versailles after WWI to "ask" for German land. Germany took back what rightfully was theirs. Also, Poland invaded Czechoslovakia when Germany entered the Sudetenland that was also taken from Germany at Versailles. Poland had no business being there.
The treaty signed between Great Britain and Poland stipulated that if anyone made an act of war against Poland, Britain would stand with them. When Germany entered its former lands, the Soviets came in from the East. Britain declared on Germany, but not the Soviets. The Soviets were not part of the Allies until 2 years after the "invasion".