Transbaikal Military District
The army was formed in July 1941 in the Transbaikal Military District from the 12th Rifle Corps, under the command of Major General Sergey Fomenko, promoted to lieutenant general on 16 October 1943. It initially included the 65th, 93rd, 94th, and 114th Rifle Divisions as well as the 31st and 32nd Fortified Regions, supported by a number of artillery units, among others. The army became part of the Transbaikal Front in September when the latter was created from the district, and for the rest of World War II guarded the Manchurian-Soviet and Mongolian-Soviet borders in the Transbaikal.