A poor position. Also, like Stalingrad, it became a battle for the airfields, once they were lost, resupply became nearly impossible. My reading of military history has convinced me that to withstand a siege you cannot depend on outside resupply and the supply depots have to built up a long time before. Also makes me think of the Boer War/2nd South African War. Once the British seized the strategic initiative and were able to force the Boers to defend, they deprived them of their greatest asset, their mobility.