the following quote from a book title stalingrad the fateful seige by anthony Beevor
"Paulus has often been blamed for not disobeying Hitler later, once the scale of the disaster was clear, but his real failure as a commander was his failure to prepare to face the threat. It was his own army which was threatened. All he needed to do was to withdraw most of his tanks from the wasteful battle in the city to prepare a strong mechanized force ready to react rapidly. Supply and Ammunition dumps should have been reorganized to ensure their vehicles were kept ready to move at short notice. This comparatively small degree of preparation-and disobedience to the fuehers headquarters-would have left the sixth army in a position to defend itself effectively at the crucial moment."