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" refers to the traditional colour of the Communist movement.