Revolutionary Insurrectionary Army of Ukraine
A Ukrainian nationalist movement was active in Ukraine during the war. More significant was the emergence of an anarchist political and military movement known as the Revolutionary Insurrectionary Army of Ukraine or the Anarchist Black Army led by Nestor Makhno. The Black Army, which counted numerous Jews and Ukrainian peasants in its ranks, played a key part in halting Denikin's White Army offensive towards Moscow during 1919, later ejecting White forces from Crimea.