|Active||1919-1920 (and afterwards?), 1939-43|
Civil War & Polish-Soviet War
The 12th Army (Russian Civil War 2nd Formation) was formed from the 1st and 3rd Ukrainian Red Armies in central Ukraine in the summer of 1919. In July 1920 Simon Aralov was chief of intelligence with this unit.
Second World War
It was then involved in the Soviet invasion of Poland (1939). It entered the Second World War as part of the Soviet Southwestern Front, comprising the 13th Rifle Corps (including the 44th, 58th, and 192nd Rifle Divisions) 17th Rifle Corps (60th Mountain, 69th Mountain, and 164th Rifle Divisions), 16th Mechanised Corps (15th, 39th Tank Divisions, 240th Mechanised Division) 10th, 11th and 12th Fortified Regions, and artillery, engineering and other units. It participated in the frontier battle to the west of Stanislav. In the second half of July as part of the Soviet Southern Front it conducted defensive fights in the direction of Uman. During the Battle of Uman, the Twelfth Army was caught in a huge encirclement south of Kiev along with the 6th Army. Thus the army's headquarters was disbanded on 10 August 1941, after the battle.
The 12th Army was reformed in August 1941 as part of the Soviet Southern Front on the basis of 17th Rifle Corps. On 1 September 1941 its structure included 270th and 274th Rifle Divisions, the 11th Tank Division, 268th and 374th Corps Artillery Regiments, 64th and 181st Fighter Aviation Regiments, and a number of separate formations. The Army defended the left coast of the Dnepr around Zaporozhye, from the end of September to the beginning of December, 1941. It participated in the Donbass defensive, Rostov defensive and offensive, in January, 1942 in the Barvenkovo-Lozove offensive operations, in the subsequent conducted defensive fights in Donbass and on Northern Caucasus (part of the Battle of the Caucasus). In the middle of April 1942 the 261st Rifle Division under Colonel A.M. Ilina, the 4th Rifle Division (Colonel I.P.Roslogo), the 74th Rifle Division under General F.E.Sheverdina, the 176th Rifle Division (General V.N.Martsinkevicha) and 54th Tank Brigade (тбр) under Colonel K.S. Minarova were assigned to the Army.
It was later in 1942 reorganised as a defensive zone HQ, but then reformed again by conversion of the previous 5th Tank Army in mid April 1943. It joined the Southwestern Front. Its structure included the 172nd, 203rd, 244th, 333rd and 350th Rifle Divisions and other formations. In April - July the Army was in Front reserve, and then participated in the Donbass and Zaporozhye offensive operations. In November the army HQ was disbanded, with its forces transferred to other armies. Commanders included Lieutenant-General I.Shlemin (April - May 1943), and Major-General Danilov (May - October 1943).
- https://archive.is/20121221225449/victory.mil.ru/rkka/units/03/26.html 12th Army (Russian)
- Glantz, 2005, p.231, Poirier and Conner, p.38
- Grechko A., " fight for Caucasus ", 2 изд., Moscow, 1973
- Grechko A., " years of war ", Moscow, 1976
- Арушанян, " Operations of 12th army in an initial stage of war ", "ВИЖ", 1973, № 6
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