Why We Fight: The Battle of Russia | When the World Goes to War, Part 3

Why We Fight — Part 3: The Battle of Russia The war expands dramatically as Nazi Germany turns east toward the Soviet Union. Part 3 of the historic Why We Fight series, The Battle of Russia, examines the enormous conflict on the Eastern Front and the struggle between Nazi Germany and the Soviet Union. From the German invasion of the Soviet Union to the enormous battles that followed, this documentary presents the scale, determination, and devastating human cost of the fighting on the Eastern Front.