The Workers' and Peasants' Red Army (Russian: Рабоче-Крестьянская Красная Армия; РККА or Rabočě-Krěst'janskaja Krasnaja Armija; RKKA) started out as the Soviet Union's revolutionary communist combat groups during the Russian Civil War of 1918-1922. It grew into the national army of the Soviet Union. By the 1930s the Red Army was among the largest armies in history.
The Red Army is widely credited with being the decisive force in the Allied victory in World War II, having engaged and defeated about 80% of the German armed forces, the Wehrmacht and much of the Waffen SS on the Eastern Front.
During the White October Incident, the Red Army was the main army supporting the Warsaw Pact in the conquest of East Germany and contributed a significant portion to the Mutual Assured Destruction of the Eastern United Seaboard, Germany, France and Western Russia.
The Red Army was recalled back to Russia after the Seven Days War, even though a large majority did return to certain safe locations in Western Russia, a signifcant portion factionalized and was divided into private army working under warlords consisted of former Red Army officers.