Operation Typhoon : Hitler's March on Moscow, October 1941

Indeed it is surpassed in scale only by the German operations to invade France and the Low Countries in May 1940 (Case Yellow) and the Soviet Union itself in June 1941 (Operation Barbarossa). Although the fighting on the Eastern Front is arguably best known for Hitler's 1942 offensive to reach and conquer the oil fields of southern Russia (Case Blue), culminating in the battle for Stalingrad, Army Group South's 1942 summer offensive involved only half the number of German troops employed for Operation Typhoon"--