"Through the fog the army moves on. Pushing through borders. Knocking over obstacles. Killing all enemies. Victory is secured, brothers, march on until the flag rises over the landscape."
The Holy Council
Let's say they're back. With their jets and assault rifles with vampir sights. Basically how they were in January 1945, but at full strength. They attack poor Poland and...France...AGAIN and start another war in Europe. Germany struggles to battle the modern soldiers, but they get through. Germany took over a little bit of Poland and...all of France..
What would happen next? And yes, I'm aware US soldiers are stationed in Germany. They were deported before this.