From Glanz " Zhukov´s greatest defeat"

The operation Uranus was due to begin earlier ( even something like mid to late October) but the weather conditions were so bad that the operation was postponed twice until November 19th.

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The Germans definitely did their best to destroy the Soviet bridges to the bridgeheads but many were built under the water level during the autumn so I think several were not found or difficult to bomb and also the Luftwaffe was so widely dispersed it´s hard to see they could do much damage anywhere. The area from Stalingrad to Caucasus was about as huge as Germany in 1939 alone.

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