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A post war study by the US military assessed the each German soldier in 1941 as being the equivalent of 2.31 Soviet soldiers. By the winter of 1942-3, this advantage had fallen to 1.61:1, with Guard units being rated at 1.34:1. German Pz troops maintained a much better advantage in open warfare.
Some people seem unable to understand that with the caucasus oil fields captured the German war machine would suddenly have all the fuel oil it needed, And on top of this with Stalingrad captured allot of the logistical problems would've been solved.
Sure the Russians could move their industry back into Siberia, but without the caucasus oil fields and against a now well fueled German army the Soviets were doomed to lose, and Stalin knew this.
I have the first snow falling on Stalingrad on 22 Oct. 1942.
also,
Because of the supply problems and the winter cold, (my bold)Heeresgruppe A's advance in the Caucasus stopped on 2 Nov. 1942 5 miles short of Ordshonikidse, the southern most point ever reached by the Germans during the war on the Eastern front.
My sources:
The Battle For Stalingrad by Marshal Vasili Ivanovich Chuikov
The Battle For Stalingrad:199 days by Edwin P. Hoyt
Stalingrad by Heinz Schroter
Hitler Moves East by Paul Carell
And again the numbers speak for themselves:
German casualties on the Eastern front (Not counting civilians):
~2.5 million soldiers.
Soviet casualties on the Eastern front (Not counting civilians):
~13 million soldiers, and it is suspected another 2 million have yet to be found or accounted for (A pit with thausands of Soviet corpses was recently found, all of them Soviet soldiers, and none of them accounted for in loss files)
FB, I just gave that as a starting point about the snow. Just as a gauge of when it at least got cold enough. But you're correct, doesn't mean absolute freezing.