Would it have dragged on longer? Looking at the hardware the Soviets poured over the german lines they would have had it anyways. If the Germans had entered the Soviet Union as liberators from Communism (as Richard suggests) then it may have been a different story.

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'We march. The enemy is retreating in transport. We follow on foot.' Lt.Neil McCallum 5/7 Gordons 19th November 1942