I think the horrors of that campaign between the Germans and Soviets is almost unknown here in the US.
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Myself included, most people are surprised to learn that while American fatalities in Europe during WWII numbered around 500,000, the Russians lost around 13 million people. Not sure of the civilian/military breakdown re that number.
I read somewhere that at the time of the Normandy Invasion, 85% of the Wehrmacht was fighting on the Eastern Front.
It's not something John Ford would have put into his movies (clearly designed to boost American morale), but Russia bore the overwhelming brunt of the fight against the Axis.
I’ve seen various numbers. Here’s one I’ve seen more than a few times. The Russians captured millions of German troops. After the war only 50,000 went back to Germany.