This is a tricky situation. The problem is that Germany also did a "job" in Poland. They used explosives.
Well, Germany survived the 30 years war, somehow the 100 years war and uncounted wars before, between and after.
We had a forced brain drain most of our history and many other countries profited from this and still...look what we made of it!
My point is that you like to talk about heritage coming form blood and we know what kind of blood mixes Germans have...
Sorry, it's YOU who brings this on the threads again and again...only you!
I really don't know why you want to make Germans to Slavs...aren't you proud of what you Slavs are? Isn't that enough?