[Answer] 2. It is often said that this battle was the key turning point in the Soviet Union's war with Germany, dooming the Nazis due to tremendous irreplaceable casualties.

Step 1 : Introduction to the question "2. It is often said that this battle was the key turning point in the Soviet Union's war with Germany, dooming the Nazis due to tremendous irreplaceable casualties."

...1. Battle of Moscow 2. Battle of Smolensk 3. Battle of Kiev 4. Battle of Stalingrad With an estimated two million casualties, the Battle of Stalingrad was one of the bloodiest in history. The fatal error of wasting so many soldiers due to Hitler's belief in Aryan supremacy was one that many historians have said was what cost Hitler the war with the Soviets. Germany could not recuperate their losses whilst the Soviets continued to fight on despite the equally heavy losses due its large population.

Step 2 : Answer to the question "2. It is often said that this battle was the key turning point in the Soviet Union's war with Germany, dooming the Nazis due to tremendous irreplaceable casualties."

Battle of Stalingrad:

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