page_title: Operation Barbarossa
section_title: Soviet preparations
hierarchical_section_title: Operation Barbarossa / Soviet preparations
caption_attribution_description: English: “Marshal Zhukov speaking”. General Georgy Zhukov speaking. Русский: «Выступление Г. К. Жукова». Генерал армии Г. К. Жуков выступает, стоя на трибуне. Россия, Москва
context_page_description: Operation Barbarossa was the code name for the Axis invasion of the Soviet Union, which started on Sunday, 22 June 1941, during World War II. The operation put into action Nazi Germany's ideological goal of conquering the western Soviet Union so as to repopulate it with Germans. The German Generalplan Ost aimed to use some of the conquered as slave labour for the Axis war effort, to acquire the oil reserves of the Caucasus and the agricultural resources of Soviet territories, and eventually through extermination, enslavement, Germanization and mass deportation to Siberia, remove the Slavic peoples and create Lebensraum for Germany.
  In the two years leading up to the invasion, Germany and the Soviet Union signed political and economic pacts for strategic purposes. Nevertheless, the German High Command began planning an invasion of the Soviet Union in July 1940, which Adolf Hitler authorized on 18 December 1940.
context_section_description: In 1930, Mikhail Tukhachevsky, a prominent military theorist in tank warfare in the interwar period and later Marshal of the Soviet Union, forwarded a memo to the Kremlin that lobbied for colossal investment in the resources required for the mass production of weapons, pressing the case for "40,000 aircraft and 50,000 tanks". In the early 1930s, a modern operational doctrine for the Red Army was developed and promulgated in the 1936 Field Regulations in the form of the Deep Battle Concept. Defense expenditure also grew rapidly from just 12 percent of the gross national product in 1933 to 18 percent by 1940.
  During Stalin's Great Purge in the late-1930s, which had not ended by the time of the German invasion on 22 June 1941, much of the officer corps of the Red Army was executed or imprisoned and their replacements, appointed by Stalin for political reasons, often lacked military competence. Of the five Marshals of the Soviet Union appointed in 1935, only Kliment Voroshilov and Semyon Budyonny survived Stalin's purge. Tukhachevsky was killed in 1937. Fifteen of 16 army commanders, 50 of the 57 corps commanders, 154 of the 186 divisional commanders, and 401 of 456 colonels were killed, and many other officers were dismissed. In total, about 30,000 Red Army personnel were executed. Stalin further underscored his control by reasserting the role of political commissars at the divisional level and below to oversee the political loyalty of the army to the regime. The commissars held a position equal to that of the commander of the unit they were overseeing. But in spite of efforts to ensure the political subservience of the armed forces, in the wake of Red Army's poor performance in Poland and in the Winter War, about 80 percent of the officers dismissed during the Great Purge were reinstated by 1941. Also, between January 1939 and May 1941, 161 new divisions were activated. Therefore, although about 75 percent of all the officers had been in their position for less than one year at the start of the German invasion of 1941, many of the short tenures can be attributed not only to the purge, but also to the rapid increase in creation of military units.
  In the Soviet Union, speaking to his generals in December 1940, Stalin mentioned Hitler's references to an attack on the Soviet Union in Mein Kampf and Hitler's belief that the Red Army would need four years to ready itself. Stalin declared "we must be ready much earlier" and "we will try to delay the war for another two years". As early as August 1940, British intelligence had received hints of German plans to attack the Soviets only a week after Hitler informally approved the plans for Barbarossa and warned the Soviet Union accordingly. But Stalin's distrust of the British led him to ignore their warnings in the belief that they were a trick designed to bring the Soviet Union into the war on their side.  In early 1941, Stalin's own intelligence services and American intelligence gave regular and repeated warnings of an impending German attack. Soviet spy Richard Sorge also gave Stalin the exact German launch date, but Sorge and other informers had previously given different invasion dates that passed peacefully before the actual invasion. Stalin acknowledged the possibility of an attack in general and therefore made significant preparations, but decided not to run the risk of provoking Hitler.
  Beginning in July 1940, the Red Army General Staff developed war plans that identified the Wehrmacht as the most dangerous threat to the Soviet Union, and that in the case of a war with Germany, the Wehrmacht's main attack would come through the region north of the Pripyat Marshes into Belorussia, which later proved to be correct. Stalin disagreed, and in October he authorized the development of new plans that assumed a German attack would focus on the region south of Pripyat Marshes towards the economically vital regions in Ukraine. This became the basis for all subsequent Soviet war plans and the deployment of their armed forces in preparation for the German invasion.
  In early-1941 Stalin
caption: Marshal Zhukov speaking at a military conference in Moscow, September 1941
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