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Von Kleist remembered: "The 4th Panzer Army was advancing on my left. It could have taken Stalingrad
without a fight, at the end of July, but was diverted to the south to help me crossing
the Don. I did not needs it's aid, and merely congested the roads I was using.
When it turned north again, a fortnight later, the Russians had gathered just
sufficient forces at Stalingrad to check it."
Simple question: what happens if Hoth's Fourth Panzer Army isn't diverted and instead moves to Stalingrad together with Paulus' Sixth Army, capturing the city with relative ease some time in August? Case Blue probably still won't work as envisioned by Hitler, I guess, but the Volga has now been cut which at the least will mess with the Soviet logistical/fuel situation. What effects will the German capture of Stalingrad have beyond that?