Fall Blau
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Fall Blau (Case Blue in German) was the German code name for two WWII studies in future combat.
The first, dating from 1938, was a study by the Luftwaffe on attacks against England, which later evolved into Planstudie 1939 on aerial warfare as a whole.
The second, from 1942, was one of three operational plans detailing the offensive operations on the Eastern Front for the German summer offensive, leading eventually to the Battle of Stalingrad. Fall Blau covered the northern regions of the operation near Voronezh, while Maus detailed the attacks into the Caucasus, and Siegfried the attack on Stalingrad and the Volga. Fall Blau was often used to describe the entire operational plan as well, and has generally been used this way in historical studies.
See also: Operation Kremlin