EVEN before Operation Barbarossa petered out in December 1941, Germany's oil reserves were severely depleted. Adolf Hitler worried that his armed forces would soon grind to a halt for want of petroleum products. During the last months of 1941 and the first of 1942, economic considerations played as much of a role in the formulation of a new strategy as did the run-down state of the eastern armies and air fleets. Hitler feared heavy Soviet bombing attacks on Rumanian oilfields, his main source of oil, and knew that the Reich's reserves were almost exhausted. Consequently, he considered the protection of the Rumanian oilfields and the acquisition of new sources of oil crucial if he were to wage a prolonged war against the growing list of nations he opposed.1 He therefore formulated Fall Blau (Case Blue), a major campaign for summer 1942. This aimed first, through preliminary offensives in the Crimea, to protect Rumanian oil centres from Soviet air attacks, and second, through a powerful thrust to the Don River and then into the Caucasus, to deliver that oil-rich region into German hands. The capture of 1.
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