sentences:  Without substantial help from the Don Cossacks, the tiny Volunteer Army was unable to prevent the Red Guards under Vladimir Antonov-Ovseyenko from overrunning the Don region in late February 1918.To escape the Red onslaught, the Volunteer Army was forced to flee south into the lands of the Kuban Cossack Host while Kaledin remained behind and committed suicide.During the months of March and April 1918, the Volunteer Army incorporated anticommunist Kuban Cossacks into its ranks and made an abortive attempt to capture the Kuban capital of Yekaterinodar from Red forces.