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By mid September 1942 it was pretty obvious that the Army group A offensive was spent. What if the Germans didn't do the October 1942 attempt to push on from the Terek river (and the separate offensive toward Tupase) and went on the defensive. Focus shifts early to holding what they have over the winter.
Lets say one Panzer Division and one infantry Division are moved from Army Group A to Kalach on the Don and are sitting in reserve behind Stalingrad before November 18th 1942.