Operation Barbarossa was the invasion of the Soviet Union by Nazi Germany and several of its European Axis allies starting on Sunday, 22 June 1941, during World War II. More than 3.8 million Axis troops invaded the western Soviet Union along a 2,900-kilometer (1,800 mi) front, with the main goal of capturing territory up to a line between Arkhangelsk and Astrakhan, known as the A–A line. The attack became the largest and costliest military offensive in human history, with around 10 million combatants taking part in the opening phase and over 8 million casualties by the end of the operation on 5 December 1941. It marked a major escalation of World War II, opened the Eastern Front—the largest and deadliest land war in history—and brought the Soviet Union into the Allied powers. The operation, code-named after the Holy Roman Emperor Frederick Barbarossa ("red beard"), put into action Nazi Germany's ideological goals of eradicating communism and conquering the western Soviet Union to repopulate it with Germans under Generalplan Ost, which planned for the removal of the native Slavic peoples by mass deportation to Siberia, Germanisation, enslavement, and genocide. The material targets of the invasion were the agricultural and mineral resources of territories such as Ukraine and Byelorussia and oil fields in the Caucasus. The Axis eventually captured five million Soviet Red Army troops on the Eastern Front and deliberately starved to death or otherwise killed 3.3 million prisoners of war, as well as millions of civilians. Mass shootings and gassing operations, carried out by German paramilitary death squads and collaborators, murdered over a million Soviet Jews as part of the Holocaust. In the two years leading up to the invasion, Nazi Germany and the Soviet Union signed political and economic pacts for strategic purposes. Following the Soviet occupation of Bessarabia and Northern Bukovina in July 1940, the German High Command began planning an invasion of the country, which was approved by Adolf Hitler in December. In early 1941, Soviet leader Joseph Stalin, despite receiving intelligence about an imminent attack, did not order a mobilization of the Red Army, fearing that it might provoke Germany. As a result, Soviet forces were largely caught unprepared when the invasion began, with many units positioned poorly and understrength. The invasion began on 22 June 1941 with a massive ground and air assault. The main part of Army Group South invaded from occupied Poland on 22 June, and on 2 July was joined by a combination of German and Romanian forces attacking from Romania. Kiev was captured on 19 September, which was followed by the captures of Kharkov on 24 October and Rostov-on-Don on 20 November, by which time most of Crimea had been captured and Sevastopol put under siege. Army Group North overran the Baltic lands, and on 8 September 1941 began a siege of Leningrad with Finnish forces that ultimately lasted until 1944. Army Group Centre, the strongest of the three groups, captured Smolensk in late July 1941 before beginning a drive on Moscow on 2 October. Facing logistical problems with supply, slowed by muddy terrain, not fully outfitted for Russia's brutal winter, and coping with determined Soviet resistance, Army Group Centre's offensive stalled at the city's outskirts by 5 December, at which point the Soviets began a major counteroffensive.
The failure of Operation Barbarossa reversed the fortunes of Nazi Germany. Operationally, it achieved significant victories and occupied some of the most important economic regions of the Soviet Union, captured millions of prisoners, and inflicted heavy casualties. The German high command anticipated a quick collapse of resistance as in the invasion of Poland, but instead the Red Army absorbed the German Wehrmacht's strongest blows and bogged it down in a war of attrition for which Germany was unprepared. Following the heavy losses and logistical strain of Barbarossa, German forces mounted subsequent offensives on a much narrower front—such as Case Blue in 1942 and Operation Citadel in 1943—both of which ultimately failed.
Background
=== Naming === The theme of Barbarossa had long been used by the Nazi Party as part of their political imagery, though this was really a continuation of the glorification of the famous Crusader king by German nationalists since the 19th century. According to a Germanic medieval legend, revived in the 19th century by the nationalistic tropes of German Romanticism, the Holy Roman Emperor Frederick Barbarossa—who drowned in Asia Minor while leading the Third Crusade—was not dead but asleep, along with his knights, in a cave in the Kyffhäuser mountains in Thuringia, and would awaken in the hour of Germany's greatest need and restore the nation to its former glory. Originally, the invasion of the Soviet Union was codenamed Operation Otto (alluding to Holy Roman Emperor Otto the Great's expansive campaigns in Eastern Europe), but Hitler had the name changed to Operation Barbarossa in December 1940. Hitler had in July 1937 praised Barbarossa as the emperor who first expressed Germanic cultural ideas and carried them to the outside world through his imperial mission. For Hitler, the name Barbarossa signified his belief that the conquest of the Soviet Union would usher in the Nazi "Thousand-Year Reich".
Racial policies of Nazi Germany
As early as 1925, Adolf Hitler vaguely declared in his political manifesto and autobiography Mein Kampf that he would invade the Soviet Union, asserting that the German people needed to secure Lebensraum ('living space') in which to thrive for generations to come. On 10 February 1939, Hitler told his army commanders that the next war would be "purely a war of Weltanschauungen ['worldviews']... totally a war of peoples, a racial war". On 23 November, once World War II had already started, Hitler declared that "racial war has broken out and this war shall determine who shall govern Europe, and with it, the world". The racial policy of Nazi Germany portrayed the Soviet Union (and all of Eastern Europe) as populated by non-Aryan Untermenschen ('sub-humans'), ruled by Jewish Bolshevik conspirators. Hitler claimed in Mein Kampf that Germany's destiny was to follow the Drang nach Osten ('drive to the East') as it did "600 years ago" (see Ostsiedlung). Accordingly, it was a partially secret but well-documented Nazi policy to kill, deport, or enslave the majority of Russian and other Slavic populations and repopulate the land west of the Urals with Germanic peoples, under Generalplan Ost (General Plan for the East). The Nazis' belief in their ethnic superiority pervades official records and pseudoscientific articles in German periodicals, on topics such as "how to deal with alien populations."
While older postwar histories tended to emphasize the myth of the "clean Wehrmacht", upholding its honor in the face of Hitler's fanaticism, historian Jürgen Förster notes that "In fact, the military commanders were caught up in the ideological character of the conflict, and involved in its implementation as willing participants". Before and during the invasion of the Soviet Union, German troops were indoctrinated with anti-Bolshevik, anti-Semitic and anti-Slavic ideology via movies, radio, lectures, books, and leaflets. Likening the Soviets to the forces of Genghis Khan, Hitler told the Croatian military leader Slavko Kvaternik that the "Mongolian race" threatened Europe. Following the invasion, many Wehrmacht officers told their soldiers to target "Jewish Bolshevik subhumans", the "Mongol hordes", the "Asiatic flood" and the "Red beast". Nazi propaganda portrayed the war against the Soviet Union as an ideological war between German National Socialism and Jewish Bolshevism and a racial war between the disciplined Germans and the Jewish, Romani and Slavic Untermenschen. An 'order from the Führer' stated that the paramilitary SS Einsatzgruppen, which closely followed the Wehrmacht's advance, were to execute all Soviet functionaries who were "less valuable Asiatics, Gypsies and Jews." Six months into the invasion of the Soviet Union, the Einsatzgruppen had murdered more than 500,000 Soviet Jews, a figure greater than the number of Red Army soldiers killed in battle by then. German army commanders cast Jews as the major cause behind the "partisan struggle". The main view of German troops was "[w]here there's a partisan, there's a Jew, and where there's a Jew, there's a partisan", or "[t]he partisan is where the Jew is." Many of them also saw the war in racial terms, and regarded their Soviet enemies as sub-human. After the war began, the Nazis issued a ban on sexual relations between Germans and foreign slaves. There were regulations enacted against the Ost-Arbeiter ('Eastern workers') that included the death penalty for sexual relations with a German. Heinrich Himmler, in his secret memorandum, Reflections on the Treatment of Peoples of Alien Races in the East (dated 25 May 1940), outlined the Nazi plans for the non-German populations in the East. Himmler believed the Germanisation process in Eastern Europe would be complete when "in the East dwell only men with truly German, Germanic blood." The Nazi secret plan Generalplan Ost, prepared in 1941 and confirmed in 1942, called for a "new order of ethnographical relations" in the territories occupied by Nazi Germany in Eastern Europe. It envisaged ethnic cleansing, executions and enslavement of the populations of conquered countries, with very small percentages undergoing Germanisation, expulsion into the depths of Russia or other fates, while the conquered territories would be Germanised. The plan had two parts, the Kleine Planung ('small plan'), which covered actions to be taken during the war and the Große Planung ('large plan'), which covered policies after the war was won, to be implemented gradually over 25 to 30 years. A speech given by General Erich Hoepner demonstrates the character of the Nazi racial plan, as he informed the 4th Panzer Group that the war against the Soviet Union was "an essential part of the German people's struggle for existence" (Daseinskampf), also referring to the imminent battle as the "old struggle of Germans against Slavs" and even stated, "the struggle must aim at the annihilation of today's Russia and must, therefore, be waged with unparalleled harshness." Hoepner also added that the Germans were fighting for "the defence of European culture against Moscovite–Asiatic inundation, and the repulse of Jewish Bolshevism ... No adherents of the present Russian-Bolshevik system are to be spared." Walther von Brauchitsch also told his subordinates that troops should view the war as a "struggle between two different races and [should] act with the necessary severity." Racial motivations were central to Nazi ideology and played a key role in planning for Operation Barbarossa since both Jews and communists were considered equivalent enemies of the Nazi state. Nazi imperialist ambitions rejected the common humanity of both groups, declaring the supreme struggle for Lebensraum to be a Vernichtungskrieg ('war of annihilation').
German-Soviet relations of 1939–40
On August 23, 1939, Germany and the Soviet Union signed a non-aggression pact in Moscow known as the Molotov–Ribbentrop Pact. A secret protocol to the pact outlined an agreement between Germany and the Soviet Union on the division of the eastern European border states between their respective "spheres of influence", Soviet Union and Germany would partition Poland in the event of an invasion by Germany, and the Soviets would be allowed to overrun Finland, Estonia, Latvia and the region of Bessarabia. The rest of the world learned of this pact later the same day, but were unaware of the provisions to partition Poland. The pact stunned the world because of the parties' earlier mutual hostility and their conflicting ideologies. The conclusion of this pact was followed by the German invasion of Poland on 1 September that triggered the outbreak of World War II in Europe, then the Soviet invasion of Poland that led to the annexation of the eastern part of the country. As a result of the pact, Germany and the Soviet Union maintained reasonably strong diplomatic relations for two years and fostered an important economic relationship. The countries entered a trade pact in 1940 by which the Soviets received German military equipment and trade goods in exchange for raw materials, such as oil and wheat, to help the German war effort by circumventing the British blockade of Germany. Despite the parties' ostensibly cordial relations, each side was highly suspicious of the other's intentions. For instance, the Soviet invasion of Bukovina in June 1940 went beyond their sphere of influence as agreed with Germany. After Germany entered the Axis Pact with Japan and Italy, it began negotiations about a potential Soviet entry into the pact. After two days of negotiations in Berlin from 12 to 14 November 1940, Ribbentrop presented a draft treaty for a Soviet entry into the Axis. However, Hitler had no intention of allowing the Soviet Union into the Axis and in an order stated, "Political conversations designed to clarify the attitude of Russia in the immediate future have been started. Regardless of the outcome of these conversations, all preparations for the East previously ordered orally are to be continued. [Written] directives on that will follow as soon as the basic elements of the army's plan for the operation have been submitted to me and approved by me." There would be no "long-term agreement with Russia" given that the Nazis intended to go to war with them; but the Soviets approached the negotiations differently and were willing to make huge economic concessions to secure a relationship under general terms acceptable to the Germans just a year before. On 25 November 1940, the Soviet Union offered a written counter-proposal to join the Axis if Germany would agree to refrain from interference in the Soviet Union's sphere of influence, but Germany did not respond. As both sides began colliding with each other in Eastern Europe, conflict appeared more likely, although they did sign a border and commercial agreement addressing several open issues in January 1941. According to historian Robert Service, Joseph Stalin was convinced that the overall military strength of the Soviet Union was such that he had nothing to fear and anticipated an easy victory should Germany attack; moreover, Stalin believed that since the Germans were still fighting the British in the west, Hitler would be unlikely to open up a two-front war and subsequently delayed the reconstruction of defensive fortifications in the border regions. When German soldiers swam across the Bug River to warn the Red Army of an impending attack, they were shot as enemy agents. Some historians believe that Stalin, despite providing an amicable front to Hitler, did not wish to remain allies with Germany. Rather, Stalin might have had intentions to break off from Germany and proceed with his own campaign against Germany to be followed by one against the rest of Europe. Other historians contend that Stalin did not plan for such an attack in June 1941, given the perilous state of the Red Army at the time of the invasion.
Axis invasion plans
Stalin's reputation as a brutal dictator contributed both to the Nazis' justification of their assault and to their expectations of success, as Stalin's Great Purge of the 1930s had executed many competent and experienced military officers, leaving Red Army leadership weaker than their German adversary. The Nazis often emphasized the Soviet regime's brutality when targeting the Slavs with propaganda. They also claimed that the Red Army was preparing to attack the Germans, and their own invasion was thus presented as a pre-emptive strike. Hitler also utilised the rising tension between the Soviet Union and Germany over territories in the Balkans as one of the pretexts for the invasion. While no concrete plans had yet been made, Hitler told one of his generals in June 1940 that the victories in Western Europe finally freed his hands for a "final showdown" with Bolshevism. With the successful end to the campaign in France, General Erich Marcks was assigned the task of drawing up the initial invasion plans of the Soviet Union. The first battle plans were entitled Operation Draft East (colloquially known as the Marcks Plan). His report advocated the A–A line as the operational objective of any invasion of the Soviet Union. This assault would extend from the northern city of Arkhangelsk on the Arctic Sea through Gorky and Rostov to the port city of Astrakhan at the mouth of the Volga on the Caspian Sea. The report concluded that—once established—this military border would reduce the threat to Germany from attacks by enemy bombers. Although Hitler was warned by many high-ranking military officers, such as Friedrich Paulus, that occupying Western Russia would create "more of a drain than a relief for Germany's economic situation," he anticipated compensatory benefits such as the demobilisation of entire divisions to relieve the acute labour shortage in German industry, the exploitation of Ukraine as a reliable and immense source of agricultural products, the use of forced labour to stimulate Germany's overall economy and the expansion of territory to improve Germany's efforts to isolate the United Kingdom. Hitler was further convinced that Britain would sue for peace once the Germans triumphed in the Soviet Union, and if they did not, he would use the resources gained in the East to defeat the British Empire.
We only have to kick in the door and the whole rotten structure will come crashing down. Hitler received the final military plans for the invasion on 5 December 1940, which the German High Command had been working on since July 1940, under the codename "Operation Otto". Upon reviewing the plans, Hitler formally committed Germany to the invasion when he issued Führer Directive 21 on 18 December 1940, where he outlined the precise manner in which the operation was to be carried out. Hitler also renamed the operation to Barbarossa in honor of medieval Emperor Friedrich I of the Holy Roman Empire, a leader of the Third Crusade in the 12th century. The Barbarossa Decree, issued by Hitler on 30 March 1941, supplemented the Directive by decreeing that the war against the Soviet Union would be one of annihilation and legally sanctioned the eradication of all Communist political leaders and intellectual elites in Eastern Europe. The invasion was tentatively set for May 1941. According to a 1978 essay by German historian Andreas Hillgruber, the invasion plans drawn up by the German military elite were substantially coloured by hubris, stemming from the rapid defeat of France at the hands of the "invincible" Wehrmacht and by traditional German stereotypes of Russia as a primitive, backward "Asiatic" country. Red Army soldiers were considered brave and tough, but the officer corps was held in contempt. The leadership of the Wehrmacht paid little attention to politics, culture, and the considerable industrial capacity of the Soviet Union, in favour of a very narrow military view. Hillgruber argued that because these assumptions were shared by the entire military elite, Hitler was able to push through with a "war of annihilation" that would be waged in the most inhumane fashion possible with the complicity of "several military leaders", even though it was quite clear that this would be in violation of all accepted norms of warfare. Even so, in autumn 1940, some high-ranking German military officials drafted a memorandum to Hitler on the dangers of an invasion of the Soviet Union. They argued that the eastern territories (Ukrainian Soviet Socialist Republic, the Byelorussian Soviet Socialist Republic, the Estonian Soviet Socialist Republic, the Latvian Soviet Socialist Republic, and the Lithuanian Soviet Socialist Republic) would only end up as a further economic burden for Germany. It was further argued that the Soviets, in their current bureaucratic form, were harmless and that the occupation would not benefit Germany politically either. Hitler, solely focused on his ultimate ideological goal of eliminating the Soviet Union and Communism, disagreed with economists about the risks and told Hermann Göring, the commander-in-chief of the Luftwaffe, that he would no longer listen to misgivings about the economic dangers of a war with the USSR. It is speculated that this was passed on to General Georg Thomas, who had produced reports that predicted a net economic drain for Germany in the event of an invasion of the Soviet Union unless its economy was captured intact and the Caucasus oilfields seized in the first blow; Thomas revised his future report to fit Hitler's wishes. The Red Army's ineptitude in the Winter War against Finland in 1939–40 also convinced Hitler of a quick victory within a few months. Neither Hitler nor the General Staff anticipated a long campaign lasting into the winter, and therefore adequate preparations, such as the distribution of warm clothing and winterisation of important military equipment like tanks and artillery, were not made. Further to Hitler's Directive, Göring's Green Folder, issued in March 1941, laid out the agenda for the next step after the anticipated quick conquest of the Soviet Union. The Hunger Plan outlined how entire urban populations of conquered territories were to be starved to death, thus creating an agricultural surplus to feed Germany and urban space for the German upper class. This genocidal strategy aimed to redirect agricultural resources from the Soviet Union to Germany by cutting off food to vast regions—particularly central and northern Russia—resulting in the intentional starvation of millions. These policies were modified by late 1941 when the original plan proved logistically untenable. Nevertheless, the strategy of feeding only those civilians deemed economically useful continued, leading to mass deaths in urban centres like Leningrad, Kharkov, and Kiev. To this end, Nazi policy aimed to destroy the Soviet Union as a political entity in accordance with the geopolitical Lebensraum ideals for the benefit of future generations of the "Nordic master race". In 1941, Nazi ideologue Alfred Rosenberg—later appointed Reich Minister of the Occupied Eastern Territories—suggested that conquered Soviet territory should be administered in the following Reichskommissariate ('Reich Commissionerships'):
German military planners also researched Napoleon's failed invasion of Russia. In their calculations, they concluded that there was little danger of a large-scale retreat of the Red Army into the Russian interior, as it could not afford to give up the Baltic countries, Ukraine, or the Moscow and Leningrad regions, all of which were vital to the Red Army for supply reasons and would thus have to be defended. Hitler and his generals disagreed on where Germany should focus its energy. Hitler, in many discussions with his generals, repeated his order of "Leningrad (Saint Petersburg) first, the Donbas second, Moscow third;" but he consistently emphasized the destruction of the Red Army over the achievement of specific terrain objectives. Hitler believed Moscow to be of "no great importance" in the defeat of the Soviet Union and instead believed victory would come with the destruction of the Red Army west of the capital, especially west of the Western Dvina and Dnieper rivers, and this pervaded the plan for Barbarossa. This belief later led to disputes between Hitler and several German senior officers, including Heinz Guderian, Gerhard Engel, Fedor von Bock and Franz Halder, who believed the decisive victory could only be delivered at Moscow. They were unable to sway Hitler, who had grown overconfident in his own military judgment as a result of the rapid successes in Western Europe.
German preparations
The Germans had begun massing troops near the Soviet border even before the campaign in the Balkans had finished. By the third week of February 1941, 680,000 German soldiers were gathered in assembly areas on the Romanian-Soviet border. In preparation for the attack, Hitler had secretly moved upwards of 3 million German troops and approximately 690,000 Axis soldiers to the Soviet border regions. Additional Luftwaffe operations included numerous aerial surveillance missions over Soviet territory many months before the attack. Although the Soviet High Command was alarmed by this, Stalin's belief that Nazi Germany was unlikely to attack only two years after signing the Molotov–Ribbentrop Pact resulted in slow Soviet preparation. This fact aside, the Soviets did not entirely overlook the threat of their German neighbor. Well before the German invasion, Marshal Semyon Timoshenko referred to the Germans as the Soviet Union's "most important and strongest enemy", and as early as July 1940, the Red Army Chief of Staff, Boris Shaposhnikov, produced a preliminary three-pronged plan of attack for what a German invasion might look like, remarkably similar to the actual attack. Since April 1941, the Germans had begun setting up Operation Haifisch and Operation Harpune to substantiate their claims that Britain was the real target. These simulated preparations in Norway and the English Channel coast included activities such as ship concentrations, reconnaissance flights and training exercises. The reasons for the postponement of Barbarossa from the initially planned date of 15 May to the actual invasion date of 22 June 1941 (a 38-day delay) are debated. The reason most commonly cited is the unforeseen contingency of invading Yugoslavia and Greece on 6 April 1941 until June 1941. Historian Thomas B. Buell indicates that Finland and Romania, which were not involved in initial German planning, needed additional time to prepare to participate in the invasion. Buell adds that an unusually wet winter kept rivers at full flood until late spring. The floods may have discouraged an earlier attack, even if they occurred before the end of the Balkans Campaign.
The importance of the delay is still debated. William Shirer argued that Hitler's Balkan Campaign had delayed the commencement of Barbarossa by several weeks and thereby jeopardised it. Many later historians argue that the 22 June start date was sufficient for the German offensive to reach Moscow by September. Antony Beevor wrote in 2012 about the delay caused by German attacks in the Balkans that "most [historians] accept that it made little difference" to the eventual outcome of Barbarossa. The Germans deployed one independent regiment, one separate motorised training brigade and 153 divisions for Barbarossa, which included 104 infantry, 19 panzer and 15 motorised infantry divisions in three army groups, nine security divisions to operate in conquered territories, four divisions in Finland and two divisions as reserve under the direct control of OKH. These were equipped with 6,867 armoured vehicles, of which 3,350–3,795 were tanks, 2,770–4,389 aircraft (that amounted to 65 percent of the Luftwaffe), 7,200–23,435 artillery pieces, 17,081 mortars, about 600,000 motor vehicles and 625,000–700,000 horses. Finland slated 14 divisions for the invasion, and Romania offered 13 divisions and eight brigades over the course of Barbarossa. The entire Axis forces, 3.8 million personnel, deployed across a front extending from the Arctic Ocean southward to the Black Sea, were all controlled by the OKH and organised into Army Norway, Army Group North, Army Group Centre and Army Group South, alongside three Luftflotten (air fleets, the air force equivalent of army groups) that supported the army groups: Luftflotte 1 for North, Luftflotte 2 for Centre and Luftflotte 4 for South. Army Norway was to operate in far northern Scandinavia and bordering Soviet territories. Army Group North was to march through Latvia and Estonia into northern Russia, then either take or destroy the city of Leningrad, and link up with Finnish forces. Army Group Centre, the army group equipped with the most armour and air power, was to strike from Poland into Belorussia and the west-central regions of Russia proper, and advance to Smolensk and then Moscow. Army Group South was to strike the heavily populated and agricultural heartland of Ukraine, taking Kiev before continuing eastward over the steppes of southern USSR to the Volga with the aim of controlling the oil-rich Caucasus. Army Group South was deployed in two sections separated by a 198-mile (319 km) gap. The northern section, which contained the army group's only panzer group, was in southern Poland right next to Army Group Centre, and the southern section was in Romania. The German forces in the rear (mostly Waffen-SS and Einsatzgruppen units) were to operate in conquered territories to counter any partisan activity in areas they controlled, as well as to execute captured Soviet political commissars and Jews. On 17 June, Reich Security Main Office (RSHA) chief Reinhard Heydrich briefed around thirty to fifty Einsatzgruppen commanders on "the policy of eliminating Jews in Soviet territories, at least in general terms". While the Einsatzgruppen were assigned to the Wehrmacht's units, which provided them with supplies such as gasoline and food, they were controlled by the RSHA. The official plan for Barbarossa assumed that the army groups would be able to advance freely to their primary objectives simultaneously, without spreading thin, once they had won the border battles and destroyed the Red Army's forces in the border area.
Soviet preparations
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. Defence expenditure also grew rapidly from just 12 percent of the gross national product in 1933 to 18 percent by 1940. During Joseph 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. Many of their replacements, appointed by Stalin for political reasons, 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 the creation of military units. 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 authorised 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 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 a week after Hitler informally approved the plans for Barbarossa and warned the Soviet Union accordingly. Some of this intelligence was based on Ultra information obtained from deciphered Enigma traffic, which was relayed to Stalin by Andrei Vyshinsky, deputy commissar for foreign affairs, via letter from Winston Churchill. However, 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. Soviet intelligence officers also received word of an invasion around 20 June from Mao Zedong whose spy, Yan Baohang, had overheard talk of the plans at a dinner with a German military attaché and sent word to Zhou Enlai. The Chinese maintain the tipoff helped Stalin make preparations, though little exists to confirm the Soviets made any real changes upon receiving the intelligence. 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.
In early 1941, Stalin authorised the State Defence Plan 1941 (DP-41), which along with the Mobilisation Plan 1941 (MP-41), called for the deployment of 186 divisions, as the first strategic echelon, in the four military districts of the western Soviet Union that faced the Axis territories; and the deployment of another 51 divisions along the Dvina and Dnieper Rivers as the second strategic echelon under Stavka control, which in the case of a German invasion was tasked to spearhead a Soviet counteroffensive along with the remaining forces of the first echelon. But on 22 June 1941 the first echelon contained 171 divisions, numbering 2.6–2.9 million; and the second strategic echelon contained 57 divisions that were still mobilising, most of which were still understrength. The second echelon was undetected by German intelligence until days after the invasion commenced, in most cases only when German ground forces encountered them. At the start of the invasion, the manpower of the Soviet military force that had been mobilised was 5.3–5.5 million, and it was still increasing as the Soviet reserve force of 14 million, with at least basic military training, continued to mobilise. The Red Army was dispersed and still preparing when the invasion commenced. Their units were often separated and lacked adequate transportation. While transportation remained insufficient for Red Army forces, when Operation Barbarossa kicked off, they possessed some 33,000 pieces of artillery, a number far greater than the Germans had at their disposal. A Deputy Director of the Soviet Defense Ministry's Institute of Military Affairs, Yuri Kirshin, documented that the Red Army had around 23,000 tanks available at the start of Barbarossa of which 14,700 were combat-ready. Around 11,000 tanks were in the western military districts that faced the German invasion force. According to military historian John Burtt, 17,520 tanks out of a total of Soviet 24,000 were out of commission while undergoing maintenance in June 1941, thereby leaving only 6,480 available for frontline service at the time of the German invasion. Hitler later declared to some of his generals, "If I had known about the Russian tank strength in 1941 I would not have attacked". However, maintenance and readiness standards were very poor; ammunition and radios were in short supply, and many armoured units lacked trucks for supplies. The most advanced Soviet tank models—the KV-1 and T-34—which were superior to all current German tanks, as well as all designs still in development as of the summer 1941, were not available in large numbers at the time the invasion commenced. Furthermore, in the autumn of 1939, the Soviets disbanded their mechanised corps and partly dispersed their tanks to infantry divisions; but following their observation of the German campaign in France, in late 1940 they began to reorganise most of their armoured assets back into mechanised corps with a target strength of 1,031 tanks each. However, these large armoured formations were unwieldy, and moreover they were spread out in scattered garrisons, with their subordinate divisions up to 100 kilometres (62 miles) apart. The reorganisation was still in progress and incomplete when Barbarossa commenced. Soviet tank units were rarely well equipped, and they lacked training and logistical support. Units were sent into combat with no arrangements in place for refuelling, ammunition resupply, or personnel replacement. Often, after a single engagement, units were destroyed or rendered ineffective. The Soviet numerical advantage in heavy equipment was thoroughly offset by the superior training and organisation of the Wehrmacht. The Soviet Air Force (VVS) held the numerical advantage with a total of approximately 19,533 aircraft, which made it the largest air force in the world in the summer of 1941. About 7,133–9,100 of these were deployed in the five western military districts, and an additional 1,445 were under naval control.
Historians have debated whether Stalin was planning an invasion of German territory in the summer of 1941. The debate began in the late 1980s when Viktor Suvorov published a journal article and later the book Icebreaker in which he claimed that Stalin had seen the outbreak of war in Western Europe as an opportunity to spread communist revolutions throughout the continent, and that the Soviet military was being deployed for an imminent attack at the time of the German invasion. This view had also been advanced by former German generals following the war. Suvorov's thesis was fully or partially accepted by a limited number of historians, including Valeri Danilov, Joachim Hoffmann, Mikhail Meltyukhov, and Vladimir Nevezhin, and attracted public attention in Germany, Israel, and Russia. It has been strongly rejected by most historians, and Icebreaker is generally considered to be an "anti-Soviet tract" in Western countries. David Glantz and Gabriel Gorodetsky wrote books to rebut Suvorov's arguments. The majority of historians believe that Stalin was seeking to avoid war in 1941, as he believed that his military was not ready to fight the German forces. The debate on whether Stalin intended to launch an offensive against Germany in 1941 remains inconclusive but has produced an abundance of scholarly literature and helped to expand the understanding of larger themes in Soviet and world history during the interwar period.
Order of battle
Invasion
At around 01:00 on Sunday, 22 June 1941, the Soviet military districts in the border area were alerted by NKO Directive No. 1, issued late on the night of 21 June. It called on them to "bring all forces to combat readiness", but to "avoid provocative actions of any kind". It took up to two hours for several of the units subordinate to the Fronts to receive the order of the directive, and the majority did not receive it before the invasion commenced. A German communist deserter, Alfred Liskow, had crossed the lines at 21:00 on 21 June and informed the Soviets that an attack was coming at 04:00. Stalin was informed, but apparently regarded it as disinformation. Liskow was still being interrogated when the attack began. On 21 June, at 13:00 Army Group North received the codeword "Düsseldorf", indicating Barbarossa would commence the next morning, and passed down its own codeword, "Dortmund". At around 03:15 on 22 June 1941, the Axis Powers commenced the invasion of the Soviet Union with the bombing of major cities in Soviet-occupied Poland and an artillery barrage on Red Army defences on the entire front. Air-raids were conducted as far as Kronstadt near Leningrad and Sevastopol in the Crimea. At the same time the German declaration of war was presented by Foreign Minister Joachim von Ribbentrop, first delivered at 05:30 Moscow time by German ambassador Friedrich von der Schulenburg to Soviet foreign minister Vyacheslav Molotov. Meanwhile, ground troops crossed the border, accompanied in some locales by Lithuanian and Ukrainian partisans. Roughly three million soldiers of the Wehrmacht went into action and faced slightly fewer Soviet troops at the border. Accompanying the German forces during the initial invasion were Finnish and Romanian units as well.
At around noon, the news of the invasion was broadcast to the Soviet population by Molotov: "... Without a declaration of war, German forces fell on our country, attacked our frontiers in many places ... The Red Army and the whole nation will wage a victorious Patriotic War for our beloved country, for honour, for liberty ... Our cause is just. The enemy will be beaten. Victory will be ours!" By calling upon the population's devotion to their nation rather than the Party, Molotov struck a patriotic chord that helped the stunned citizens absorb the shattering news. Within the first few days of the invasion, the Soviet High Command and Red Army were extensively reorganised so as to place them on the necessary war footing. Stalin did not address the nation about the German invasion until 3 July, when he also called for a "Patriotic War... of the entire Soviet people". In Germany, on the morning of 22 June, Nazi propaganda minister Joseph Goebbels announced the invasion to the waking nation in a radio broadcast with Hitler's words: "At this moment a march is taking place that, for its extent, compares with the greatest the world has ever seen. I have decided today to place the fate and future of the Reich and our people in the hands of our soldiers. May God aid us, especially in this fight!" Later the same morning, Hitler proclaimed to his colleagues, "Before three months have passed, we shall witness a collapse of Russia, the like of which has never been seen in history". Hitler also addressed the German people via the radio, presenting himself as a man of peace, who reluctantly had to attack the Soviet Union. Following the invasion, Goebbels instructed that Nazi propaganda use the slogan "European crusade against Bolshevism" to describe the war; subsequently thousands of volunteers and conscripts joined the Waffen-SS.
Initial attacks
The initial momentum of the German ground and air attack completely destroyed the Soviet organisational command and control within the first few hours, paralyzing every level of command from the infantry platoon to the Soviet High Command in Moscow. Moscow failed to grasp the magnitude of the catastrophe that confronted the Soviet forces in the border area, and Stalin's first reaction was disbelief. At around 07:15, Stalin issued NKO Directive No. 2, which announced the invasion to the Soviet Armed Forces, and called on them to attack Axis forces wherever they had violated the borders and launch air strikes into the border regions of German territory. At around 09:15, Stalin issued NKO Directive No. 3, signed by Timoshenko, which now called for a general counteroffensive on the entire front "without any regards for borders" that both men hoped would sweep the enemy from Soviet territory. Stalin's order, which Timoshenko authorised, was not based on a realistic appraisal of the military situation at hand, but commanders passed it along for fear of retribution if they failed to obey; several days passed before the Soviet leadership became aware of the enormity of the opening defeat, and before Stalin comprehended the magnitude of the calamity. Significant amounts of Soviet territory were lost along with Red Army forces as a result.
Air war
Luftwaffe reconnaissance units plotted Soviet troop concentrations, supply dumps and airfields, and marked them down for destruction. Additional Luftwaffe attacks were carried out against Soviet command and control centres to disrupt the mobilisation and organisation of Soviet forces. In contrast, Soviet artillery observers based at the border area had been under the strictest instructions not to open fire on German aircraft prior to the invasion. One plausible reason given for the Soviet hesitation to return fire was Stalin's initial belief that the assault was launched without Hitler's authorisation. The Luftwaffe reportedly destroyed 1,489 aircraft on the first day of the invasion and over 3,100 during the first three days. Hermann Göring, Minister of Aviation and Commander-in-Chief of the Luftwaffe, distrusted the reports and ordered the figure checked. Luftwaffe staffs surveyed the wreckage on Soviet airfields, and their original figure proved conservative, as over 2,000 Soviet aircraft were estimated to have been destroyed on the first day of the invasion. In reality, Soviet losses were likely higher; a Soviet archival document recorded the loss of 3,922 Soviet aircraft in the first three days against an estimated loss of 78 German aircraft. The Luftwaffe reported the loss of only 35 aircraft on the first day of combat. A document from the German Federal Archives puts the Luftwaffe's loss at 63 aircraft for the first day. By the end of the first week, the Luftwaffe had achieved air supremacy over the battlefields of all the army groups, but was unable to extend this air dominance over the vast expanse of the western Soviet Union. According to the war diaries of the German High Command, the Luftwaffe by 5 July had lost 491 aircraft with 316 more damaged, leaving it with only about 70 percent of the strength it had at the start of the invasion.
Baltic countries
On 22 June, Army Group North attacked the Soviet Northwestern Front and broke through its 8th and 11th Armies. The Soviets immediately launched a powerful counterattack against the German 4th Panzer Group with the Soviet 3rd and 12th Mechanised Corps, but the Soviet attack was defeated. On 25 June, the 8th and 11th Armies were ordered to withdraw to the Western Dvina River, where it was planned to meet up with the 21st Mechanised Corps and the 22nd and 27th Armies. However, on 26 June, Erich von Manstein's LVI Panzer Corps reached the river first and secured a bridgehead across it. The Northwestern Front was forced to abandon the river defences, and on 29 June Stavka ordered the Front to withdraw to the Stalin Line on the approaches to Leningrad. On 2 July, Army Group North began its attack on the Stalin Line with its 4th Panzer Group, and on 8 July captured Pskov, devastating the defences of the Stalin Line and reaching Leningrad oblast. The 4th Panzer Group had advanced about 450 kilometres (280 mi) since the start of the invasion and was now only about 250 kilometres (160 mi) from its primary objective Leningrad. On 9 July it began its attack towards the Soviet defences along the Luga River in Leningrad oblast.
Ukraine and Moldavia
The northern section of Army Group South faced the Southwestern Front, which had the largest concentration of Soviet forces, and the southern section faced the Southern Front. In addition, the Pripyat Marshes and the Carpathian Mountains posed a serious challenge to the army group's northern and southern sections respectively. On 22 June, only the northern section of Army Group South attacked, but the terrain impeded their assault, giving the Soviet defenders ample time to react. The German 1st Panzer Group and 6th Army attacked and broke through the Soviet 5th Army. Starting on the night of 23 June, the Soviet 22nd and 15th Mechanised Corps attacked the flanks of the 1st Panzer Group from north and south respectively. Although intended to be concerted, Soviet tank units were sent in piecemeal due to poor coordination. The 22nd Mechanised Corps ran into the 1st Panzer Army's III Motorised Corps and was decimated, and its commander killed. The 1st Panzer Group bypassed much of the 15th Mechanised Corps, which engaged the German 6th Army's 297th Infantry Division, where it was defeated by antitank fire and Luftwaffe attacks. On 26 June, the Soviets launched another counterattack on the 1st Panzer Group from north and south simultaneously with the 9th, 19th and 8th Mechanised Corps, which altogether fielded 1,649 tanks, and supported by the remnants of the 15th Mechanised Corps. The battle lasted for four days, ending in the defeat of the Soviet tank units. On 30 June Stavka ordered the remaining forces of the Southwestern Front to withdraw to the Stalin Line, where it would defend the approaches to Kiev. On 2 July, the southern section of Army Group South—the Romanian 3rd and 4th Armies, alongside the German 11th Army—entered Soviet Moldavia, which was defended by the Southern Front. Counterattacks by the Front's 2nd Mechanised Corps and 9th Army were defeated, but on 9 July the Axis advance stalled along the defences of the Soviet 18th Army between the Prut and Dniester rivers.
Belorussia
In the opening hours of the invasion, the Luftwaffe destroyed the Western Front's air force on the ground, and with the aid of Abwehr and their supporting anti-communist fifth columns operating in the Soviet rear paralyzed the Front's communication lines, which particularly cut off the Soviet 4th Army headquarters from headquarters above and below it. On the same day, the 2nd Panzer Group crossed the Bug River, broke through the 4th Army, bypassed Brest Fortress, and pressed on towards Minsk, while the 3rd Panzer Group bypassed most of the 3rd Army and pressed on towards Vilnius. Simultaneously, the German 4th and 9th Armies engaged the Western Front forces in the environs of Białystok. On the order of the Western Front commander, Dmitry Pavlov, the 6th and 11th Mechanised Corps and the 6th Cavalry Corps launched a strong counterstrike towards Grodno on 24–25 June in hopes of destroying the 3rd Panzer Group. However, the 3rd Panzer Group had already moved on, with its forward units reaching Vilnius on the evening of 23 June, and the Western Front's armoured counterattack instead ran into infantry and antitank fire from the V Army Corps of the German 9th Army, supported by Luftwaffe air attacks. By the night of 25 June, the Soviet counterattack was defeated, and the commander of the 6th Cavalry Corps was captured. The same night, Pavlov ordered all the remnants of the Western Front to withdraw to Slonim towards Minsk. Subsequent counterattacks to buy time for the withdrawal were launched against the German forces, but all of them failed. On 27 June, the 2nd and 3rd Panzer Groups met near Minsk and captured the city the next day, completing the encirclement of almost all of the Western Front in two pockets: one around Białystok and another west of Minsk. The Germans destroyed the Soviet 3rd and 10th Armies while inflicting serious losses on the 4th, 11th and 13th Armies, and reported to have captured 324,000 Soviet troops, 3,300 tanks, 1,800 artillery pieces.
A Soviet directive was issued on 29 June to combat the mass panic rampant among the civilians and the armed forces personnel. The order stipulated swift, severe measures against anyone inciting panic or displaying cowardice. The NKVD worked with commissars and military commanders to scour possible withdrawal routes of soldiers retreating without military authorisation. Field expedient general courts were established to deal with civilians spreading rumours and military deserters. On 30 June, Stalin relieved Pavlov of his command, and on 22 July tried and executed him along with many members of his staff on charges of "cowardice" and "criminal incompetence". On 29 June, Hitler, through Brauchitsch, instructed Bock to halt the advance of the panzers of Army Group Centre until the infantry formations liquidating the pockets caught up but Guderian, with the tacit support of Bock and Halder, ignored the instruction and attacked on eastward towards Bobruisk, albeit reporting the advance as a reconnaissance-in-force. He also personally conducted an aerial inspection of the Minsk-Białystok pocket on 30 June and concluded that his panzer group was not needed to contain it, since Hermann Hoth's 3rd Panzer Group was already involved in the Minsk pocket. On the same day, some of the infantry corps of the 9th and 4th Armies, having sufficiently liquidated the Białystok pocket, resumed their march eastward to catch up with the panzer groups. On 1 July, Bock ordered the panzer groups to resume their full offensive eastward on the morning of 3 July. But Brauchitsch, upholding Hitler's instruction, and Halder, unwillingly going along with it, opposed Bock's order. However, Bock insisted on the order by stating that it would be irresponsible to reverse orders already issued. The panzer groups resumed their offensive on 2 July before the infantry formations had sufficiently caught up.
Northeast Finland
During German-Finnish negotiations, Finland had demanded to remain neutral unless the Soviet Union attacked them first. Germany therefore sought to provoke the Soviet Union into an attack on Finland. After Germany launched Barbarossa on 22 June, German aircraft used Finnish air bases to attack Soviet positions. The same day the Germans launched Operation Rentier and occupied the Petsamo Province at the Finnish-Soviet border. Simultaneously Finland proceeded to remilitarise the neutral Åland Islands. Despite these actions the Finnish government insisted via diplomatic channels that they remained a neutral party, but the Soviet leadership already viewed Finland as an ally of Germany. Subsequently, the Soviets proceeded to launch a massive bombing attack on 25 June against all major Finnish cities and industrial centres, including Helsinki, Turku, and Lahti. During a night session on the same day the Finnish parliament decided to go to war against the Soviet Union. Finland was divided into two operational zones. Northern Finland was the staging area for Army Norway. Its goal was to execute a two-pronged pincer movement on the strategic port of Murmansk, named Operation Silver Fox. Southern Finland was still under the responsibility of the Finnish Army. The goal of the Finnish forces was, at first, to recapture Ladoga Karelia as well as the Karelian Isthmus, which included Finland's second largest city Viipuri.
Further German advances
On 2 July and through the next six days, a rainstorm typical of Belarusian summers slowed the progress of the panzers of Army Group Centre, and Soviet defences stiffened. The delays gave the Soviets time to organise a massive counterattack against Army Group Centre. The army group's ultimate objective was Smolensk, which commanded the road to Moscow. Facing the Germans was an old Soviet defensive line held by six armies. On 6 July, the Soviets launched a counter-attack using the V and VII Mechanised Corps of the 20th Army, which collided with the German 39th and 47th Panzer Corps in a battle where the Red Army lost 832 tanks of the 2,000 employed during five days of ferocious fighting. The Germans defeated this counterattack thanks largely to the coincidental presence of the Luftwaffe's only squadron of tank-busting aircraft. The 2nd Panzer Group crossed the Dnieper River and closed in on Smolensk from the south, while the 3rd Panzer Group, after defeating the Soviet counterattack, closed on Smolensk from the north. Trapped between their pincers were three Soviet armies. The 29th Motorised Division captured Smolensk on 16 July, yet a gap remained in Army Group Centre. On 18 July, the panzer groups came to within ten kilometres (6.2 mi) of closing the gap, but the trap did not finally close until 5 August, when upwards of 300,000 Red Army soldiers had been captured and 3,205 Soviet tanks were destroyed. Large numbers of Red Army soldiers escaped to stand between the Germans and Moscow as resistance continued.
Four weeks into the campaign, the Germans realised they had grossly underestimated Soviet strength. The German troops had used their initial supplies, and General Bock quickly came to the conclusion that not only had the Red Army offered stiff opposition, but German difficulties were also due to the logistical problems with reinforcements and provisions. Operations were slowed down to allow for resupply; the delay was to be used to adapt strategy to the new situation. In addition to strained logistics, poor roads made it difficult for wheeled vehicles and foot infantry to keep up with the faster armoured spearheads, and shortages in boots and winter uniforms were becoming apparent. Furthermore, all three army groups had suffered 179,500 casualties by 2 August, and had only received 47,000 replacements. Hitler had lost faith in battles of encirclement, as large numbers of Soviet soldiers had escaped the pincers. He now believed he could defeat the Soviet state by economic means, depriving them of the industrial capacity to continue the war. That meant seizing the industrial centre of Kharkov, the Donbas, and the oil fields of the Caucasus in the south, and the speedy capture of Leningrad, a major centre of military production, in the north.
