The Western Separate Army (Russian: Западная отдельная армия) was an anti-Bolshevik Army on the Eastern Front during the Russian Civil War, which fought from January 1919 – July 1919 in the Siberia – Ural Region.
On March 6, 1919 the Western Army went on the offensive, defeated the 5th and 1st Red Armies, took Ufa (March 14), Belebey, Birsk, Bugulma (April 10), Buguruslan and approached Samara on the Volga River.
The southern group of the Red Army hit the flank and rear of the Western army from the district of Orenburg-Buzuluka and, having defeated her at Buguruslan and Belebey, threw her back behind the Belaya River.
In the Battle of Ufa (May 25-June 19) The Western Army was again defeated and retreated to Chelyabinsk.
By the end of May the Western Army troops were consolidated into the Volga, Ural and Ufa groups.