The White Army was the Tsarist army in Russia after the Bolshevik Revolution or October Revolution in 1917. It was opposed by the Black Army among others.
White Army ex Wiki
The White movement (Russian: Бѣлое движенiе/Белое движение, tr. Beloye dvizheniye) and its military arm the White Army (Бѣлая Армiя/Белая Армия, Belaya Armiya) - known as the White Guard (Бѣлая Гвардiя/Белая Гвардия, Belaya Gvardiya) or the Whites (Белые and белогвардейцы “White Guardsmen”) - was a loose confederation of Anti-Communist counter-revolutionary forces.The movement comprised one of the politico-military Russian forces who fought the "Red" Bolsheviks in the former Russian Empire after the October Revolution, and then against the Red Army in the subsequent Russian Civil War (1917–23).