Case Blue (German: Fall Blau), later renamed Operation Braunschweig, was the German Armed Forces' (Wehrmacht) name for its plan for the 1942 strategic summer offensive in southern Russia between 28 June and 24 November 1942.The operation was a continuation of the previous year's Operation Barbarossa, intended to knock the Soviet Union out of the war, and involved a two-pronged attack against the oil fields of Baku as well as an advance in the direction of Stalingrad along the Volga River, to cover the flanks of the advance towards Baku.