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162-707: During the German invasion of Poland in September 1939, Ciężki escaped to France to continue work on breaking Enigma ciphers . In 1943 he was captured by the Germans and interned in an S.S. concentration camp. In the 1930s, Ciężki, as an army captain, was chief of the Polish General Staff Cipher Bureau's German section ( Biuro Szyfrów -4 , abbreviated BS-4 ). This section "broke" ( decrypted ) German Enigma machine ciphers . Ciężki

324-639: A military alliance with the United Kingdom and with France , believing that Polish independence and territorial integrity would be defended with their support if it were to be threatened by Germany. On the other hand, British Prime Minister Neville Chamberlain and his Foreign Secretary , Lord Halifax , still hoped to strike a deal with Hitler regarding Danzig (and possibly the Polish Corridor). Chamberlain and his supporters believed war could be avoided and hoped Germany would agree to leave

486-536: A "last minute" order in the summer of 1939, Poland bought 160 French Morane-Saulnier M.S.406 fighters and 111 English airplanes (100 light bombers Fairey Battle , 10 Hurricanes and 1 Supermarine Spitfire ; the sale of 150 Spitfires asked by the Polish government was rejected by the Air Ministry). Despite the fact that some of the airplanes had been shipped to Poland (the first transport of purchased aircraft on

648-531: A 'Bomber Brigade', 'Pursuit Brigade' and aircraft assigned to the various ground armies. The Polish fighters were older than their German counterparts; the PZL P.11 fighter—produced in the early 1930s—had a top speed of only 365 km/h (227 mph), far less than German bombers. To compensate, the pilots relied on its maneuverability and high diving speed. The Polish Air Force's decisions to strengthen its resources came too late, mostly due to budget limitations. As

810-565: A 2009 letter to the Polish daily newspaper Gazeta Wyborcza , Russian Prime Minister Vladimir Putin stated that the Molotov–Ribbentrop Pact of August 1939 was "immoral". In 2015, however, as President of the Russian Federation, he commented: "In this sense I share the opinion of our culture minister ( Vladimir Medinsky praising the pact as a triumph of Stalin's diplomacy) that this pact had significance for ensuring

972-574: A German sabotage group which had not heard anything about a delay of the invasion made an attack on the Jablunkov Pass and Mosty railway station in Silesia . On the morning of 26 August, this group was repelled by Polish troops. The German side described all this as an incident "caused by an insane individual" (see Jabłonków incident ). On 26 August, Hitler tried to dissuade the British and

1134-461: A Soviet invasion. Polish and Jewish citizens might initially have preferred Soviet rule to Nazi German rule. However, the Soviet authorities quickly imposed Communist ideology and administration upon their new subjects and suppressed the traditional ways of life. For instance, the Soviet government confiscated, nationalized and redistributed all private Polish property. During the two years following

1296-605: A bloody terror and are driven from their homes. The series of border violations, which are unbearable to a great power, prove that the Poles no longer are willing to respect the German frontier." Poland participated with Germany in the partition of Czechoslovakia that followed the Munich Agreement , although they were not part of the agreement. It coerced Czechoslovakia to surrender the region of Český Těšín by issuing an ultimatum to that effect on 30 September 1938, which

1458-607: A confrontation with the Soviet Union at that time. Under the terms of the Polish-British Common Defence Pact of 25 August 1939, Britain had promised assistance if a European power attacked Poland. A secret protocol of the pact, however, specified that the European power referred to Germany. When Polish Ambassador Edward Raczyński reminded Foreign Secretary Lord Halifax of the pact, he

1620-460: A mutual understanding with Hitler as a diplomatic solution. The Soviet leader sought nothing short of an ironclad guarantee against losing his sphere of influence , and aspired to create a north–south buffer zone from Finland to Romania, conveniently established in the event of an attack. The Soviets demanded the right to enter these countries in case of a security threat. Talks on military matters, that had begun in mid-August, quickly stalled over

1782-512: A mutually beneficial economic treaty that envisaged the trade and exchange of Soviet raw materials for German weapons, military technology and civilian machinery. Two days later, the Soviet Union suspended the tripartite military talks . On 24 August, the Soviet Union and Germany signed the political and military arrangements following the trade agreement, in the Molotov–Ribbentrop Pact . This pact included terms of mutual non-aggression and contained secret protocols, that regulated detailed plans for

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1944-643: A neutral attitude and ignore these facts. ... Under these circumstances, the Soviet Government has directed the High Command of the Red Army to order troops to cross the frontier and to take under their protection the life and property of the population of Western Ukraine and Western Belarus. — People's Commissar for Foreign Affairs of the U.S.S.R. V. Molotov, 17 September 1939 Molotov declared via public radio broadcast that all treaties between

2106-603: A number of over 800,000. Marshal Semyon Timoshenko commanded the invasion on the Ukrainian Front and General Mikhail Kovalyov led the Red Army on the invasion on the Belarusian Front. When drawing up the defensive Plan West of 1938, Poland's military strategists assumed the Soviet Union would remain neutral during a conflict with Germany. As a result, Polish commanders focused on massive troop deployment designs and elaborate operational exercises in

2268-475: A possible future Anglo-Soviet alliance against Germany (which indeed happened two years later). Public opinion in Britain was varied among expressions of outrage at the invasion on the one hand and a perception that Soviet claims in the region were reasonable on the other. While France had made promises to Poland, including the provision of air support, these were not honoured. A Franco-Polish Military Alliance

2430-638: A realization of any pre-1933 Weimar plans to invade and partition Poland, annex Bohemia and Austria, and create satellite or puppet states economically subordinate to Germany. As part of this long-term policy, Hitler at first pursued a policy of rapprochement with Poland, trying to improve opinion in Germany, culminating in the German–Polish Non-Aggression Pact of 1934. Earlier, Hitler's foreign policy worked to weaken ties between Poland and France and attempted to manoeuvre Poland into

2592-550: A secret protocol, that drew up the division of Northern and Eastern Europe into German and Soviet spheres of influence in the event of war. One week after the signing of the Molotov–Ribbentrop Pact, German forces invaded Poland from the west, north, and south on 1 September 1939. Polish forces gradually withdrew to the southeast where they prepared for a long defense of the Romanian Bridgehead and awaited

2754-535: A total strength of 76 rifle divisions of 6,000 men, plus 13 mountain divisions and another 33 ordinary rifle divisions of 3,000 men. On 2 September 1939 the German Army Group North carried out a maneuver to envelop the forces of the Polish ( Pomorze Army ) that defended the " Polish Corridor ", with the result that the Polish commander General Władysław Bortnowski lost communication with his divisions. The break-through of armored contingents of

2916-540: A week before the onset of war, Hitler delivered a speech to his military commanders at the Obersalzberg : The object of the war is … physically to destroy the enemy. That is why I have prepared, for the moment only in the East, my 'Death's Head' formations with orders to kill without pity or mercy all men, women, and children of Polish descent or language. Only in this way can we obtain the living space we need. With

3078-538: Is also known in Poland as the September campaign ( Polish : kampania wrześniowa ) or 1939 defensive war (Polish: wojna obronna 1939 roku ) and known in Germany as the Poland campaign ( German : Überfall auf Polen, Polenfeldzug ). German forces invaded Poland from the north, south, and west the morning after the Gleiwitz incident . Slovak military forces advanced alongside the Germans in northern Slovakia . As

3240-695: The Anti-Comintern Pact , forming a cooperative front against the Soviet Union . Poland would be granted territory to its northeast in Ukraine and Belarus if it agreed to wage war against the Soviet Union, but the concessions the Poles were expected to make meant that their homeland would become largely dependent on Germany, functioning as little more than a client state . The Poles feared that their independence would eventually be threatened altogether; historically Hitler had already denounced

3402-701: The Battles of Khalkhin Gol had ended with the Molotov – Tojo agreement, signed on 15 September as a ceasefire took effect on 16 September. On 17 September, Molotov delivered a declaration of war to Wacław Grzybowski , the Polish Ambassador in Moscow: Warsaw, as the capital of Poland, no longer exists. The Polish Government has disintegrated, and no longer shows any sign of operation. This means that

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3564-460: The Bzura river). Due to determined Polish defense and a lack of fuel, the German advance had stalled and the situation stabilized in the areas east of the line Augustów – Grodno – Białystok – Kobryń – Kowel – Żółkiew – Lwów – Żydaczów – Stryj – Turka . Rail lines were operational in approximately one-third of the territory of the country as both cross-border passenger and cargo traffic

3726-586: The Curzon Line drawn by the British in 1919, a point that would successfully be utilized by Stalin during negotiations with the Allies at the Teheran and Yalta Conferences . The Red Army had originally sown confusion among the population, claiming that they had come to save Poland from Nazi occupation. Their advance surprised Polish communities and their leaders, who had not been advised on how to respond to

3888-568: The Daugava in the north to the Carpathian Mountains in the south. Radio Baranowicze and Radio Wilno ceased to broadcast on 16 September after having been bombed by German Luftwaffe units, while Radio Lwów and Radio Warsaw II still aired as of 17 September. A Red Army force of seven field armies with a combined strength between around 450,000 and 1,000,000 troops entered eastern Poland on two fronts. Polish sources give

4050-529: The Far East in relation to the ongoing border disputes with Japan. The Soviet Union needed time to mobilize the Red Army and utilized the diplomatic advantage of waiting to attack after Poland had disintegrated. On 14 September, with Poland's collapse at hand, the first statements on a conflict with Poland appeared in the Soviet press. The undeclared war between the Soviet Union and the Empire of Japan at

4212-537: The Gleiwitz incident near the border town of Gleiwitz in Silesia. On the following day (1 September) Hitler announced, that official military actions against Poland had commenced at 4:45 a.m. German air forces bombarded the cities Lwow and Łuck . Polish security service personnel carried out arrests among Ukrainian intelligentsia in Lwow and Przemysl . On 1 September 1939 at 11:00 a.m. Moscow time ,

4374-495: The NKVD secret police in an atmosphere of terror, the results of which were used to legitimise the use of force. A Soviet campaign of political murders and other forms of repression , targeting Polish figures of authority such as military officers, police and priests, began with a wave of arrests and summary executions . The Soviet NKVD sent hundreds of thousands of people from eastern Poland to Siberia and other remote parts of

4536-618: The Nationalists during the Spanish Civil War and let the occupation of Czechoslovakia happen without effective opposition. The Soviet Union also suspected that Britain and France would seek to remain on the sidelines during any potential Nazi-Soviet conflict. Robert C. Grogin (author of Natural Enemies ) contends that Stalin, had been "putting out feelers to the Nazis" through his personal emissaries as early as 1936 and desired

4698-700: The Reichsautobahn system, be built in order to connect East Prussia with Germany proper , running through the Polish Corridor. Poland rejected this proposal, fearing that after accepting these demands, it would become increasingly subject to the will of Germany and eventually lose its independence as the Czechs had. Polish leaders also distrusted Hitler. The British were also wary of Germany's increasing strength and assertiveness threatening its balance of power strategy. On 31 March 1939, Poland formed

4860-536: The Romanian Bridgehead could be created. The Polish General Staff had not begun elaborating the "West" defence plan until 4 March 1939. It was assumed that the Polish Army, fighting in the initial phase of the war alone, would have to defend the western regions of the country. The plan of operations took into account the numerical and material superiority of the enemy and, also assumed the defensive character of Polish operations. The Polish intentions were defending

5022-556: The Russian Civil War and, de facto acquired exclusive control over the government and the regional administration. After all foreign interventions had been repelled, the Red Army, commanded by Trotsky and Stalin (among others) started to advance westward towards the disputed territories intending to encourage Communist movements in Western Europe. The Red Army eventually advanced deep into Ukraine and Belarus , and

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5184-558: The San River around Przemyśl , which were later returned to Poland. In early 1939, several months before the invasion, the Soviet Union began strategic alliance negotiations with the United Kingdom and France against the crash militarization of Nazi Germany under Adolf Hitler . Joseph Stalin pursued the Molotov–Ribbentrop Pact with Adolf Hitler, which was signed on 23 August 1939. This non-aggression pact contained

5346-526: The Soviet Union . This division is sometimes called the Fourth Partition of Poland . The Soviet (as well as German) invasion of Poland was indirectly indicated in the "secret protocol" of the Molotov–Ribbentrop Pact signed on 23 August 1939, which divided Poland into " spheres of influence " of the two powers. German and Soviet cooperation in the invasion of Poland has been described as co-belligerence . The Red Army , which vastly outnumbered

5508-662: The United Kingdom . On 3 September, based on their alliance agreements with Poland, the United Kingdom and France declared war on Germany; in the end their aid to Poland was very limited . France invaded a small part of Germany in the Saar Offensive , and the Polish army was effectively defeated even before the British Expeditionary Force could be transported to Europe, with the bulk of the BEF in France by

5670-673: The Wehrmacht advanced, Polish forces withdrew from their forward bases of operation close to the Germany–Poland border to more established defense lines to the east. After the mid-September Polish defeat in the Battle of the Bzura , the Germans gained an undisputed advantage. Polish forces then withdrew to the southeast where they prepared for a long defence of the Romanian Bridgehead and awaited expected support and relief from France and

5832-515: The end of World War II in Europe , the Soviet Union signed the Polish–Soviet border agreement of August 1945 with the new, internationally recognized Polish Provisional Government of National Unity on 16 August 1945. This agreement recognized the status quo as the new official border between the two countries, with the exception of the region around Białystok and a minor part of Galicia east of

5994-508: The fall of the Soviet Union in 1991. Politburo jargon would stylize the invasion a "liberation campaign" from its inception. The term would consequently be utilized throughout Soviet history among official references and publications. Despite the 1979 publication of a recovered copy of the secret protocols of the Molotov–Ribbentrop Pact in the Western media, the Soviet Union continued to deny their existence until 1989. Attempts to record

6156-475: The 1,009 cars and trucks and 4,842 horses in the average German infantry division, the average Polish infantry division had 76 cars and trucks and 6,939 horses. The Polish Air Force ( Lotnictwo Wojskowe ) was at a severe disadvantage against the German Luftwaffe due to inferiority in numbers and the obsolescence of its fighter planes. However, contrary to German propaganda, it was not destroyed on

6318-587: The 1939 campaign were to portray the invasion in accord with the Soviet Politburo narrative – a reunification of the Belarusian and Ukrainian peoples and the liberation of the Polish people from "Oligarchic Capitalism". The authorities strongly discouraged any study in depth and the teaching of the subject. Various underground publishers and artists addressed the issue, as in the 1982 protest song "Ballada wrześniowa " by Jacek Kaczmarski . In

6480-546: The Assistance Board. Invasion of Poland (1939) German–Soviet–Slovak victory Baltic coast 4–10 September Northern Front Southern Front Asia-Pacific Mediterranean and Middle East Other campaigns Coups The Invasion of Poland , also known as the September Campaign , Polish Campaign , and Polish Defensive War of 1939 (1 September – 6 October 1939),

6642-484: The Belorussian and Ukrainian communities were utilized to bestow some degree of legitimacy upon the annexation. The Belarusians and Ukrainians in Poland had been alienated by the former Polonization policies of the Polish government and the repression of separatist movements and thus felt little loyalty towards the Polish cause. Not all Belarusians and Ukrainians, however, trusted the Soviet regime. In practice,

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6804-570: The British merchant fleet and took part in wartime convoys . The September Campaign was devised by General Franz Halder , the chief of the general staff , and directed by General Walther von Brauchitsch the commander in chief of the German ground forces . It called for the start of hostilities before a declaration of war , and pursued a doctrine of mass encirclement and destruction of enemy forces. The infantry, far from completely mechanized but fitted with fast-moving artillery and logistic support,

6966-458: The Corridor broke down, and months passed without diplomatic interaction between Germany and Poland. During this interim period, the Germans learned that France and Britain had failed to secure an alliance with the Soviet Union against Germany, and that the Soviet Union was interested in an alliance with Germany against Poland. Hitler had already issued orders to prepare for a possible "solution of

7128-595: The French and British support and relief that they were expecting, but neither the French nor the British came to their rescue. On 17 September 1939 the Soviet Red Army invaded the Kresy regions in accordance with the secret protocol. At the opening of hostilities several Polish cities including Dubno, Łuck and Włodzimierz Wołyński let the Red Army in peacefully, convinced that it was marching on in order to fight

7290-601: The French and the British realized there was nothing they could do for Poland on short notice and plans for a long-term victory were devised instead. The French forces, that had advanced tentatively into the Saar region in early September , retreated behind the Maginot Line upon the Polish defeat on 4 October. On 1 October 1939, Winston Churchill stated in public: ... That the Russian armies should stand on this line

7452-522: The French from interfering in the upcoming conflict, even pledging that the Wehrmacht forces would be made available to Britain's empire in the future. The negotiations convinced Hitler that there was little chance the Western Allies would declare war on Germany, and even if they did, because of the lack of "territorial guarantees" to Poland, they would be willing to negotiate a compromise favourable to Germany after its conquest of Poland. Meanwhile,

7614-537: The German Army Group South near the city of Częstochowa sought to defeat the Polish 6th Infantry Division south of Katowice where the German 5th Armored Division had broken through towards Oświęcim , that captured fuel depots and seized equipment warehouses. To the east detachments of 18th corps of the German 14th Army crossed the Polish–Slovak border near Dukla Pass . The government of

7776-516: The German Ambassador Friedrich Werner von der Schulenburg . Upon the ambassador's inquiry with regards to a possible deployment of the Red Army into Poland, Molotov answered that the Soviet government "will definitely have to... start specific actions" at the right time. "But we believe that this moment has not yet come" and "any haste may ruin things and facilitate the rallying of opponents" . On 10 September,

7938-656: The German Embassy in Moscow with the assessment of and the report on the likelihood of Soviet intentions for a Red Army invasion into Poland. On 4 September 1939 all German navy units in the northern Atlantic Ocean received order "to follow to Murmansk , via the northernmost course". On the same day, the Central Committee of the Communist Party and the government of the Soviet Union approved of

8100-428: The German puppet state of Slovakia meant that Poland's southern flank was also exposed. Hitler demanded that Poland be conquered in six weeks, but German planners thought that it would require three months. They intended to exploit their long border fully with the great enveloping manoeuver of Fall Weiss . German units were to invade Poland from three directions: All three assaults were to converge on Warsaw , and

8262-453: The Germans as they attempted to cross from German-occupied France into Spain . Ciężki and Langer were sent to an SS concentration camp where, during interrogations, they managed to protect the secret of Enigma decryption. They convinced their interrogators that, while the Poles had had some success with solving the Enigma early on, changes introduced by the Germans just before the start of

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8424-558: The Germans had seven Panzer divisions, with 2,009 tanks between them, using a new operational doctrine . It held that these divisions should act in coordination with other elements of the military, punching holes in the enemy line and isolating selected units, which would be encircled and destroyed. This would be followed up by less-mobile mechanized infantry and foot soldiers. The Luftwaffe (air force) provided both tactical and strategic air power , particularly dive bombers that disrupted lines of supply and communications. Together,

8586-438: The Germans, and these units, dispersed within the infantry, were unable to effectively engage the Germans. Experiences in the Polish–Soviet War shaped Polish Army organizational and operational doctrine. Unlike the trench warfare of World War I, the Polish–Soviet War was a conflict in which the cavalry 's mobility played a decisive role. Poland acknowledged the benefits of mobility but was unable to invest heavily in many of

8748-544: The Germans. General Juliusz Rómmel of the Polish Army issued an unauthorised order to treat them like an ally before it was too late. The Soviet government announced it was acting to protect the Ukrainians and Belarusians who lived in the eastern part of Poland, because the Polish state had collapsed – according to Soviet propaganda , which perfectly echoed Western sentiment that coined the term "Blitzkrieg" to describe Germany's "lightning war" crushing defeat of Poland after just weeks of battle – and could no longer guarantee

8910-404: The People's Commissar of Defense Kliment Voroshilov 's orders to delay retirement and dismissal of Red Army personnel and young commanders for one month and to initiate full-scale training for all air defense detachments and staff in Leningrad, Moscow, Kharkov, in Belorussia and the Kiev Military District. On 5 September 1939 the People's Commissar of Foreign Affairs Vyacheslav Molotov received

9072-416: The Polish Army by about 1/3. Germany had a substantial numeric advantage over Poland and had developed a significant military before the conflict. The Heer (army) had 3,472 tanks in its inventory, of which 2,859 were with the Field Army and 408 with the Replacement Army . 453 tanks were assigned into four light divisions, while another 225 tanks were in detached regiments and companies. Most notably,

9234-485: The Polish Army during the invasion of 1939 was the 7TP light tank. It was the first tank in the world to be equipped with a diesel engine and 360° Gundlach periscope . The 7TP was significantly better armed than its most common opponents, the German Panzer I and II , but only 140 tanks were produced between 1935 and the outbreak of the war. Poland had also a few relatively modern imported designs, such as 50 Renault R35 tanks and 38 Vickers E tanks. The Polish Navy

9396-444: The Polish Army, whereas Czesław Grzelak and Henryk Stańczyk arrived at an estimated strength of 650,000 troops. On 17 September 1939 the Polish Army, although weakened by weeks of fighting, still was a coherent force. Moczulski asserted, that the Polish Army was still bigger than most European armies and strong enough to fight the Wehrmacht for a long time. On the Baranowicze – Łuniniec – Równe line, rail transport of troops from

9558-428: The Polish State and its Government have, de facto, ceased to exist. Accordingly, the agreements concluded between the USSR and Poland have thus lost their validity. Left to her own devices and bereft of leadership, Poland has become a suitable field for all kinds of hazards and surprises, which may constitute a threat to the USSR. For these reasons the Soviet Government, who has hitherto been neutral, can no longer preserve

9720-476: The Polish commander-in-chief, Marshal Edward Rydz-Śmigły , ordered a general retreat to the southeast towards the Romanian Bridgehead . Soon after, Nazi German officials further urged their Soviet counterparts to uphold their agreed-upon part and attack Poland from the east. Molotov and ambassador von der Schulenburg discussed the matter repeatedly but the Soviet Union nevertheless delayed the invasion of eastern Poland, while being occupied with events unfolding in

9882-415: The Polish defeat at the Battle of Kock , German and Soviet forces gained full control over Poland. The success of the invasion marked the end of the Second Polish Republic, though Poland never formally surrendered. On 8 October, after an initial period of military administration , Germany directly annexed western Poland and the former Free City of Danzig and placed the remaining block of territory under

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10044-449: The Polish defenders, achieved its targets, encountering only limited resistance. Some 320,000 Poles were made prisoners of war. The campaign of mass persecution in the newly acquired areas began immediately. In November 1939 the Soviet government annexed the entire Polish territory under its control . Some 13.5 million Polish citizens who fell under the military occupation were made Soviet subjects following show elections conducted by

10206-548: The Polish forces. In the resulting confusion, clashes between Polish and Soviet forces occurred along the border. General Wilhelm Orlik-Rückemann , who took command of the Border Protection Corps on 30 August, received no official directives after his appointment. As a result, he and his subordinates continued to actively engage Soviet forces, eventually dissolving the unit on 1 October. The Polish government refused to surrender or negotiate peace and instead ordered all units to leave Poland and reorganize in France. The day after

10368-411: The Polish officers they captured at the Battle of Szack on 28 September 1939. The NKVD killed 22,000 Polish military personnel and civilians in the Katyn massacre in 1940. Torture was widely used by the NKVD in various prisons, especially in small towns. On 28 September 1939, the Soviet Union and Germany signed the German–Soviet Treaty of Friendship, Cooperation and Demarcation , readdressing

10530-433: The Polish problem by military means" through the Case White scenario. In May, in a statement to his generals while they were in the midst of planning the invasion of Poland, Hitler made it clear that the invasion would not come without resistance as it had in Czechoslovakia: With minor exceptions German national unification has been achieved. Further successes cannot be achieved without bloodshed. Poland will always be on

10692-411: The Polish side, 3,000 to 7,000 soldiers died fighting the Red Army as between 230,000 and 450,000 men were taken prisoners. The Soviet troops regularly failed to honour commonly accepted terms of surrender. In some cases, after Polish soldiers had been promised to retreat freely Soviet troops arrested them once they had laid down their arms. The Soviet Union had ceased to recognise the Polish state upon

10854-407: The Polish-German border and lacked compact defence lines and good defence positions along disadvantageous terrain. That strategy also left supply lines poorly protected. One-third of Poland's forces were massed in or near the Polish Corridor, making them vulnerable to a double envelopment from East Prussia and the west. Another third was concentrated in the north-central part of the country, between

11016-546: The Romanian Bridgehead, 35,000 were north of Polesie , and 10,000 were fighting on the Baltic coast of Poland, in Hel and in Gdynia . Due to the ongoing battles in the area around Warsaw, Modlin , the Bzura , at Zamość , Lwów and Tomaszów Lubelski, most German divisions had been ordered to fall back towards these locations. The area that remained under control of the Polish authorities encompassed around 140,000 km (54,000 sq mi) – approximately 200 km (120 mi) wide and 950 km (590 mi) long – from

11178-442: The September Campaign, not all of those aircraft were mobilized. By 1 September, out of about 120 heavy bombers PZL.37s produced, only 36 PZL.37s were deployed, the rest being mostly in training units. All those aircraft were of indigenous Polish design, with the bombers being more modern than the fighters, according to the Ludomił Rayski air force expansion plan, which relied on a strong bomber force. The Polish Air Force consisted of

11340-402: The Soviet Union issued directive No. 1355-279сс that approved of the "Reorganization plan of the Red Army ground forces of 1939–1940" , which regulated detailed division transfers and updated territorial deployment plans for all the 173 future Red Army combat divisions. In addition to the reorganized infantry, the number of corps artillery and the reserve of the Supreme High Command artillery

11502-651: The Soviet Union and Poland had become void, that the Polish government had abandoned its people as the Polish state had effectively ceased to exist. On the same day, the Red Army crossed the border into Poland. On the morning of 17 September 1939, the Polish administration was still fully operational throughout the entirety of the six easternmost voivodeships , and functioned partly within an additional five voivodeships in eastern Poland as schools remained open in mid-September 1939. Polish Army units concentrated their activities on two areas – on southern ( Tomaszów Lubelski , Zamość , Lwów ) and central ( Warsaw , Modlin , and

11664-485: The Soviet Union in four major waves of deportation between 1939 and 1941. Soviet forces occupied eastern Poland until the summer of 1941 when Germany terminated its earlier pact with the Soviet Union and invaded the Soviet Union under the code name Operation Barbarossa . The area was under German occupation until the Red Army reconquered it in the summer of 1944. An agreement at the Yalta Conference permitted

11826-698: The Soviet Union to annex territories close to the Curzon Line (which almost coincided with all of their Molotov–Ribbentrop Pact portion of the Second Polish Republic ), compensating the Polish People's Republic with the greater southern part of East Prussia and territories east of the Oder–Neisse line . The Soviet Union appended the annexed territories to the Ukrainian , Byelorussian and Lithuanian Soviet Socialist Republics . After

11988-472: The Soviet Union, Britain and France began trading diplomatic suggestions regarding a political and military agreement to counter potential further German aggression. Poland did not participate in these talks. The tripartite discussions focused on possible guarantees to participating countries should German expansionism continue. The Soviets did not trust the British or the French to honour a collective security agreement, because they had refused to react against

12150-625: The Soviet invasion had started, the Polish government withdrew into Romania. Polish units proceeded to manoeuvre towards the Romanian bridgehead area, repulsing German attacks on one flank and clashing occasionally with Soviet troops on the other. In the days following the evacuation order, the Germans defeated the Kraków Army and the Lublin Army at the Battle of Tomaszów Lubelski . Soviet units would meet their German counterparts during

12312-568: The Soviets agreed to divide Eastern Europe, including Poland, into two spheres of influence ; the western one-third of the country was to go to Germany and the eastern two-thirds to the Soviet Union. The German assault was originally scheduled to begin at 4:00 a.m. on 26 August. However, on 25 August, the Polish-British Common Defence Pact was signed as an annex to the Franco-Polish alliance. In this accord, Britain committed itself to

12474-564: The Western Allies. Langer and his four comrades did not reveal [it] to the Germans, thus [making it possible to continue] exploiting this source of [intelligence] till the end of the war." In mid-1945, liberated, Major Ciężki and Lt. Colonel Langer arrived in London, where they were badly received by Colonel Gano, chief of the Polish Section II in Britain. Gano had believed a distorted account by Lt. Colonel Bertrand that represented

12636-502: The administration of the newly established General Government . The Soviet Union incorporated its newly acquired areas into its constituent Byelorussian and Ukrainian republics , and immediately started a campaign of Sovietization . In the aftermath of the invasion, a collective of underground resistance organizations formed the Polish Underground State within the territory of the former Polish state. Many of

12798-477: The advancement from opposite directions. Notable occurrences of co-operation in the field among the two armies were reported, for example, as Wehrmacht troops passed the Brest Fortress , which had been seized after the Battle of Brześć Litewski to the Soviet 29th Tank Brigade on 17 September. German General Heinz Guderian and Soviet Brigadier Semyon Krivoshein on 22 September held a joint parade in

12960-512: The annexation, the Soviet police forces arrested approximately 100,000 Polish citizens. The Poles and the Soviets re-established diplomatic relations in 1941, following the Sikorski–Mayski Agreement . The Soviets broke off talks again in 1943 after the Polish government had demanded an independent examination of the recently discovered Katyn burial pits ( Katyn massacre ). Due to denied access to secret Soviet archives, estimates of

13122-518: The armed forces time to complete its mobilization and execute a general counteroffensive with the support of the Western Allies . In case of a failure to defend most of the territory, the army was to retreat to the south-east of the country, where the rough terrain, the Stryj and Dniestr rivers, valleys, hills and swamps would provide natural lines of defence against the German advance, and

13284-656: The border between the Russian Empire and the Polish–Lithuanian Commonwealth before the first partition of 1772. In the aftermath of the peace agreement, the Soviet leaders steadily abandoned the idea of international Communist revolution and did not return to the concept for approximately 20 years. The Conference of Ambassadors and the international community (with the exception of Lithuania) recognized Poland's eastern frontiers in 1923. German troops occupied Prague on 15 March 1939. In mid-April,

13446-582: The border that had been agreed upon in advance with Germany. Despite a tactical Polish victory on 28 September at the Battle of Szack , the outcome of the larger conflict was never in doubt. Civilian volunteers, militia contingents and regrouped army units held out against German forces in and around of the Polish capital , Warsaw , until the end of September, as the Modlin Fortress , north of Warsaw, surrendered after an intense sixteen-day battle . On 1 October, Soviet troops pushed Polish units into

13608-554: The changed political situation, no useful purpose can be served in continuing the conversation." On the same day, however, Britain and Poland signed the British-Polish Pact of Mutual Assistance , which adjudicated, that Britain commit itself to defend and preserve Poland's sovereignty and independence. Hitler tried to dissuade Britain and France from interfering in the forthcoming conflict and on 26 August 1939 proposed to make Wehrmacht forces available to Britain in

13770-632: The counselor of the German embassy in Moscow, Gustav Hilger arrived at the People's Commissariat of Foreign Affairs and formally annunciated the beginning of the German–Polish War, the annexation of Danzig ( Gdańsk ) as he conveyed a request of the chief of the OKL General Staff that the radio station in Minsk provide signal support. The Soviet side partially adhered to the request. On

13932-420: The defence of Poland, guaranteeing to preserve Polish independence. At the same time, the British and the Poles were hinting to Berlin that they were willing to resume discussions—not at all how Hitler hoped to frame the conflict. Thus, he wavered and postponed his attack until 1 September, managing to in effect halt the entire invasion "in mid-leap". However, there was one exception: on the night of 25–26 August,

14094-523: The development of industry, especially in the armaments industry in ethnically Polish areas. Moreover, Poland had to deal with damage caused by World War I . This resulted in the need to build a defense industry from scratch. Between 1936 and 1939, Poland invested heavily in the newly created Central Industrial Region . Preparations for a defensive war with Germany were ongoing for many years, but most plans assumed fighting would not begin before 1942. To raise funds for industrial development, Poland sold much of

14256-477: The division of the states of northern and eastern Europe into German and Soviet spheres of influence. The Soviet sphere initially included Latvia , Estonia and Finland . Germany and the Soviet Union would partition Poland. The territories east of the Pisa , Narev , Vistula , and San rivers would fall to the Soviet Union. The pact also provided designs for the Soviet participation in the invasion, that included

14418-536: The embattled Ukrainian People's Republic sought military help from Poland to repel the invasion. The joint Polish-Ukrainian armies initially successfully captured the Ukrainian capital, Kyiv , but eventually had to retreat following a massive counteroffensive by the Red Army, culminating in the Polish–Soviet War of 1920. Following the Polish victory upon the Battle of Warsaw , the Soviets sued for peace and

14580-579: The end of September. On 17 September, the Soviet Red Army invaded Eastern Poland , the territory beyond the Curzon Line that fell into the Soviet " sphere of influence " according to the secret protocol of the Molotov–Ribbentrop Pact; this rendered the Polish plan of defence obsolete. Facing a second front, the Polish government concluded the defence of the Romanian Bridgehead was no longer feasible and ordered an emergency evacuation of all troops to neutral Romania . On 6 October, following

14742-427: The establishment of an economic agreement while concurrently negotiating with those of the tripartite group. By late July and early August 1939, Soviet and German diplomats had reached a near-complete consensus on the details for a planned economic agreement and addressed the potential for a desirable political accord. On 19 August 1939, German and Soviet officials concluded the 1939 German–Soviet Commercial Agreement ,

14904-407: The expectation that the Western Allies would honor their treaty obligations and quickly start an offensive of their own, the French and the British expected the war to develop into trench warfare, much like World War I. The Polish government was not notified of the strategy and based all of its defence plans on promises of quick relief by the Western Allies. Polish forces were stretched thinly along

15066-462: The expensive, unproven inventions since then. In spite of this, Polish cavalry brigades were used as mobile mounted infantry and had some successes against both German infantry and cavalry. An average Polish infantry division consisted of 16,492 soldiers and was equipped with 326 light and medium machine guns, 132 heavy machine guns, 92 anti-tank rifles and several dozen light, medium, heavy, anti-tank and anti-airplane field artillery. Contrary to

15228-473: The factual and fully detailed history of the 1939 Soviet invasion and its consequences have only been made after the fall of the USSR. Soviet censorship and inaccessible archives prevented serious historic research until 1991. Censorship was also applied in the People's Republic of Poland in order to preserve the image of "Polish-Soviet friendship" which was promoted by the two communist governments. Accounts of

15390-427: The failure to evacuate Langer's group from France as having been due to Langer's hesitation and lack of nerve. Langer and Ciężki were sent to a Polish signals camp at Kinross , Scotland , where Langer, bitter, disappointed, and convinced that he had been betrayed by the French when they no longer had need of him, died on 30 March 1948. Ciężki died on 9 November 1951, after living the last three years on subsidies from

15552-540: The forests at the battle of Wytyczno , during one of the last direct confrontations of the campaign. Several isolated Polish garrisons managed to hold their positions long after being surrounded, such as those in the Volhynian Sarny Fortified Area which only surrendered on 25 September. The last operational unit of the Polish Army was General Franciszek Kleeberg 's Independent Operational Group Polesie . Kleeberg surrendered on 6 October after

15714-657: The four-day Battle of Kock , effectively ending the September Campaign. On 31 October, Molotov reported to the Supreme Soviet : "A short blow by the German army, and subsequently (by) the Red Army, was enough for nothing to be left of this (lit.) bastard (state) ( Russian : ублюдок ), created at the Treaty of Versailles ". The response of non-ethnic Poles to the situation caused considerable complications. Many Ukrainians , Belarusians and Jews welcomed

15876-470: The future. At midnight of 29 August, German Foreign Minister Joachim von Ribbentrop handed British Ambassador Nevile Henderson a list of terms that would allegedly ensure peace with regard to Poland. Under the terms, Poland was to hand over Danzig ( Gdańsk ) to Germany and within a year there was a plebiscite ( referendum ) to be held in the Polish Corridor , based on residency and demography of

16038-590: The ground—in fact it was successfully dispersed before the conflict started and not a single one of its combat planes was destroyed on the ground in the first days of the conflict. In the era of fast progress in aviation the Polish Air Force lacked modern fighters, vastly due to the cancellation of many advanced projects, such as the PZL.38 Wilk and a delay in the introduction of a completely new modern Polish fighter PZL.50 Jastrząb . However, its pilots were among

16200-486: The increased number of overflights by high-altitude reconnaissance aircraft and cross-border troop movements signaled that war was imminent. On 29 August, prompted by the British, Germany issued one last diplomatic offer, with Fall Weiss yet to be rescheduled. That evening, the German government responded in a communication that it aimed not only for the restoration of Danzig but also the Polish Corridor (which had not previously been part of Hitler's demands) in addition to

16362-520: The invading troops. Local Communists gathered people to welcome the Red Army troops in the traditional Slavic way by presenting bread and salt in the eastern suburb of Brest . A sort of triumphal arch on two poles, decked with spruce branches and flowers was fashioned for this occasion. A slogan in Russian on a long red banner, glorifying the USSR and welcoming the Red Army, crowned the arch. The event

16524-580: The invasion to commence soon afterwards. On 29 August, Polish Minister of Foreign Affairs Józef Beck ordered military mobilization , but under the pressure from Great Britain and France, the mobilization was cancelled. When the final mobilization started, it added to the confusion. On 30 August, the Polish Navy sent its destroyer flotilla to Britain, executing the Peking Plan . On the same day, Marshal of Poland Edward Rydz-Śmigły announced

16686-472: The invasion was to divide Polish territory at the end of the operation; Poland was to cease to exist as a country and all Poles ("inferior people") were to be exterminated. The Soviets invaded Poland on 17 September. The campaign ended on 6 October with Germany and the Soviet Union dividing and annexing the whole of Poland under the terms of the German–Soviet Frontier Treaty . The invasion

16848-654: The main Polish army was to be encircled and destroyed west of the Vistula . Fall Weiss was initiated on 1 September 1939 and was the first operation of Second World War in Europe . The Polish determination to deploy forces directly at the German-Polish border, prompted by the Polish-British Common Defence Pact, shaped the country's defence plan, " Plan West ". Poland's most valuable natural resources, industry and population were along

17010-484: The major cities of Łódź and Warsaw. The forward positioning of Polish forces vastly increased the difficulty of carrying out strategic maneuvres, compounded by inadequate mobility, as Polish units often lacked the ability to retreat from their defensive positions, as they were being overrun by more mobile German mechanized formations. Soviet invasion of Poland Baltic coast 4–10 September Northern Front Southern Front The Soviet invasion of Poland

17172-803: The military exiles who escaped Poland joined the Polish Armed Forces in the West , an armed force loyal to the Polish government-in-exile . On 30 January 1933, the National Socialist German Workers' Party , under its leader Adolf Hitler , came to power in Germany . While some dissident elements within the Weimar Republic had long sought to annex territories belonging to Poland, it was Hitler's own idea and not

17334-531: The mobilization of Polish troops. However, he was pressured into revoking the order by the French, who apparently still hoped for a diplomatic settlement, failing to realize that the Germans were fully mobilized and concentrated at the Polish border. During the night of 31 August, the Gleiwitz incident , a false flag attack on the radio station, was staged near the border city of Gleiwitz in Upper Silesia by German units posing as Polish troops, as part of

17496-517: The modern equipment it produced. In 1936, a National Defence Fund was set up to collect funds necessary for strengthening the Polish Armed forces. The Polish Army had approximately a million soldiers, but not all were mobilized by 1 September. Latecomers sustained significant casualties when public transport became targets of the Luftwaffe . The Polish military had fewer armored forces than

17658-766: The new methods were nicknamed " Blitzkrieg " (lightning war). While historian Basil Liddell Hart claimed "Poland was a full demonstration of the Blitzkrieg theory", some other historians disagree. Aircraft played a major role in the campaign. Bombers also attacked cities, causing huge losses amongst the civilian population through terror bombing and strafing. The Luftwaffe forces consisted of 1,180 fighters , 290 Ju 87 Stuka dive bombers, 1,100 conventional bombers (mainly Heinkel He 111s and Dornier Do 17s ), and an assortment of 550 transport and 350 reconnaissance aircraft. In total, Germany had close to 4,000 aircraft, most of them modern. A force of 2,315 aircraft

17820-489: The nominally independent Free City. Hitler sought to use this as casus belli , a reason for war, reverse the post-1918 territorial losses, and on many occasions had appealed to German nationalism , promising to "liberate" the German minority still in the Corridor, as well as Danzig. The invasion was referred to by Germany as the 1939 Defensive War ( Verteidigungskrieg ) since Hitler proclaimed that Poland had attacked Germany and that "Germans in Poland are persecuted with

17982-538: The northeastern corner of the country towards the Romanian Bridgehead resumed day and night (among these troops were the 35th Reserve Infantry Division under Colonel Jarosław Szafran, the so-called " Grodno Group" ("Grupa grodzieńska") of Colonel Bohdan Hulewicz) and the second largest battle of the September Campaign – the Battle of Tomaszów Lubelski , started on the day of the Soviet invasion. According to Leszek Moczulski, around 250,000 Polish soldiers were fighting in central Poland, 350,000 were getting ready to defend

18144-505: The number of Polish citizens deported to Siberia and the total number of perished persons under Soviet rule, remained guesswork for decades after the end of the war. Estimates among the numerous publications varied between 350,000 and 1,500,000 for civilians deported to Siberia and between 250,000 and 1,000,000 for the total number of civilians who had died. With the opening of the Soviet secret archives after 1989, more realistic and potentially smaller numbers were established. In August 2009, on

18306-637: The occasion of the 70th anniversary of the Soviet invasion, the Polish Institute of National Remembrance announced that research estimates on the number of people deported to Siberia and those who had perished under Soviet wartime rule amounted to around a total of 150,000 Polish citizens. According to the last official Polish census the 13.5 million inhabitants in the newly annexed territories consisted of 38% Poles (5,1 million), 37% Ukrainians (4,7 million), 14.5% Belarusians, 8.4% Jews, 0.9% Russians and 0.6% Germans. The elections of 26 October in

18468-612: The opportunity to regain territories ceded to Poland in the Peace of Riga of 1921. The Soviet planners would enlarge the Ukrainian and Belarusian republics to subjugate the entire eastern half of Poland without the threat of disagreement with Adolf Hitler. One day after the German-Soviet pact had been signed, French and British military delegations urgently requested a meeting with Soviet military negotiator Kliment Voroshilov . On 25 August Voroshilov acknowledged, that "in view of

18630-433: The people". The Soviet authorities also suppressed the anti-Polish Organization of Ukrainian Nationalists for an independent and undivided Ukrainian state, that had actively resisted the Polish regime since the 1920s. The unifications of 1939 nevertheless proved to be decisive events in the history of Ukraine and Belarus , as these created the precursors to the two republics, that eventually achieved independence after

18792-526: The poor generally welcomed the Soviets, and the elites tended to join the opposition, despite supporting the reunification itself. The Soviets eventually introduced complete Sovietization policies in Western Belorussia and Western Ukraine, including compulsory collectivization throughout the whole region. In the process, all political parties and public associations were ruthlessly destroyed and their leaders imprisoned or executed as "enemies of

18954-428: The requested Polish representative had failed to arrive by midnight. When Polish Ambassador Lipski went to see Ribbentrop later on 31 August to indicate that Poland was favorably disposed to negotiations, he announced that he did not have the full power to sign, and Ribbentrop dismissed him. It was then broadcast that Poland had rejected Germany's offer, and negotiations with Poland came to an end. Hitler issued orders for

19116-408: The requirement for an immediate arrival of a Polish representative with full signing powers as an unacceptable ultimatum . On the night of 30/31 August, German Foreign Minister Joachim von Ribbentrop read a 16-point German proposal to ambassador Nevile Henderson . When the ambassador requested a copy of the proposals for transmission to the Polish government, Ribbentrop refused, on the grounds that

19278-671: The rest of Poland alone. German hegemony over Central Europe was also at stake. In private, Hitler said in May that Danzig was not the important issue to him, but the creation of Lebensraum for Germany. With tensions mounting, Germany turned to aggressive diplomacy. On 28 April 1939, Hitler unilaterally withdrew from both the German-Polish Non-Aggression Pact of 1934 and the Anglo-German Naval Agreement of 1935. Talks over Danzig and

19440-574: The rest of the Reich. The Polish Corridor constituted land long disputed by Poland and Germany, and was inhabited by a Polish majority. The Corridor had become a part of Poland after the Treaty of Versailles . Many Germans also wanted the urban port city of Danzig and its environs (comprising the Free City of Danzig) to be reincorporated into Germany. Danzig city had a German majority, and had been separated from Germany after Versailles and made into

19602-530: The retreat of all Polish forces from the borders towards shorter lines of defense at Warsaw and Lwów . On the same day (3 September), the new Soviet Ambassador in Berlin Aleksei Shkvartsev handed his letter of credence to Adolf Hitler . During the initiation ceremony Shkvartsev and Hitler reassured each other on their commitment to fulfill the terms of the non-aggression agreement. Foreign minister Joachim von Ribbentrop commissioned

19764-488: The right of Poland to independence in 1930, writing that Poles and Czechs were a "rabble not worth a penny more than the inhabitants of Sudan or India. How can they demand the rights of independent states?" The population of the Free City of Danzig was strongly in favour of annexation by Germany, as were many of the ethnic German inhabitants of the Polish territory that separated the German exclave of East Prussia from

19926-537: The safeguarding of the German minority in Poland. It said that they were willing to commence negotiations, but indicated that a Polish representative with the power to sign an agreement had to arrive in Berlin the next day while in the meantime it would draw up a set of proposals. The British Cabinet was pleased that negotiations had been agreed to but, mindful of how Emil Hácha had been forced to sign his country away under similar circumstances just months earlier, regarded

20088-588: The same day an extraordinary session of the Supreme Soviet of the Soviet Union confirmed the adoption of its "Universal Military Duty Act for males aged 17 years and 8 months old" , by which the service draft act of 1937 was extended for another year. Furthermore, the Politburo of the Communist Party approved the proposal of the People's Commissariat of Defense , which envisaged that the Red Army 's existing 51 rifle divisions were to be supplemented to

20250-573: The secret terms of the Molotov–Ribbentrop Pact . Lithuania was incorporated into the Soviet sphere of influence and the border within Poland was shifted to the east, increasing German territory. By this arrangement, often described as a fourth partition of Poland , the Soviet Union secured almost all Polish territory east of the line of the rivers Pisa, Narew, Western Bug and San. This amounted to about 200,000 km (77,000 sq mi) territory, inhabited by 13.5 million Polish citizens. The border created in this agreement roughly corresponded to

20412-599: The security of its citizens. Facing a second front, the Polish government concluded that the defense of the Romanian Bridgehead was no longer feasible and ordered an emergency evacuation of all uniformed troops to then-neutral Romania. The League of Nations and the peace treaties of the 1919 Paris Peace Conference did not, as it had been hoped, help to promote ideas of reconciliation along European ethnic lines. Epidemic nationalism, fierce political resentment in Central Europe (Germany, Austria, Hungary) where there

20574-487: The security of the USSR". In 2016, the Russian Supreme Court upheld the sentence of a lower court, that had found blogger Vladimir Luzgin guilty of the "rehabilitation of Nazism" after he had posted a text on social media that characterized the invasion of Poland in 1939 as a joint effort by Nazi Germany and the Soviet Union. On 17 September 2021, Russia's Foreign Ministry marked the 82nd anniversary of

20736-410: The ship "Lassel" sailed from Liverpool on 28 August ), none of them would take part in combat. In late 1938, the Polish Air Force also ordered 300 advanced PZL.46 Sum light bombers, but due to a delay in starting mass production, none of them were delivered before 1 September. When in the spring of 1939 it turned out that there were problems with the implementation of the new PZL.50 Jastrząb fighter, it

20898-532: The side of our adversaries... Danzig is not the objective. It is a matter of expanding our living space in the east, of making our food supply secure, and solving the problem of the Baltic states. To provide sufficient food you must have sparsely settled areas. There is therefore no question of sparing Poland, and the decision remains to attack Poland at the first opportunity. We cannot expect a repetition of Czechoslovakia. There will be fighting. On 22 August, just over

21060-439: The start of the invasion. Neither side issued a formal declaration of war. This decision had significant consequences and Rydz-Smigly would be later criticised for it. The Soviets killed tens of thousands of Polish prisoners of war during the campaign itself. On 24 September, the Soviet soldiers killed 42 staff and patients of a Polish military hospital in the village of Grabowiec , near Zamość . Soviet troops also executed all

21222-504: The surprise signing of the Molotov–Ribbentrop Pact on 23 August, the result of secret Nazi–Soviet talks held in Moscow , Germany neutralized the possibility of Soviet opposition to a campaign against Poland and war became imminent. In fact, the Soviets agreed not to aid France or the UK in the event of their going to war with Germany over Poland and, in a secret protocol of the pact, the Germans and

21384-471: The topic of Soviet troop passage through Poland in the event of a German attack. British and French officials pressured the Polish government to agree to the Soviet terms. However, Polish officials bluntly refused to allow Soviet troops to enter Polish territory upon expressing grave concerns that once Red Army troops had set foot on Polish soil, they might decline demands to leave. Thereupon Soviet officials suggested that Poland's objections be ignored and that

21546-452: The town. Lwów (now Lviv ) surrendered on 22 September, several days after German troops had abandoned their siege operation and allowed Soviet forces to take over. Soviet forces took Wilno (now Vilnius) on 19 September after a two-day battle , and Grodno on 24 September after a four-day battle . By 28 September, the Red Army reached the Narew – Western Bug – Vistula – San rivers line –

21708-460: The tripartite agreements be concluded. The British refused the proposal, fearing that such a move would encourage Poland to establish stronger bilateral relations with Germany. German officials had secretly been forwarding hints towards Soviet channels for months already, alluding that more favourable terms in a political agreement would be offered than Britain and France. The Soviet Union had meanwhile started discussions with Nazi Germany regarding

21870-539: The war ended with an armistice in October 1920. The parties signed a formal peace treaty, the Peace of Riga , on 18 March 1921, dividing the disputed territories between Poland and Soviet Russia. In an action that largely determined the Soviet-Polish border during the interwar period , the Soviets offered the Polish peace delegation territorial concessions in the contested borderland areas, that closely resembled

22032-541: The war had prevented any further decryption. Palluth, Fokczyński and Gaca — according to Col. Stefan Mayer , prewar chief of the intelligence department in Section II of the Polish General Staff — likewise "were acquainted to the last detail with the... breaking [of] Enigma. They were kept by [the] Germans in most awful conditions [at a time] when [the] Enigma secret was still of great importance for

22194-597: The west in order to successfully counter all German invasion attempts. This concept, however, would only leave a Border Protection Corps of approximately 20 under-strength battalions with a maximum strength of 20,000 troops assigned to defend the entire eastern border. During the Red Army invasion on 17 September, most Polish units had engaged in a fighting retreat towards the Romanian Bridgehead, where, according to overall strategic plans all divisions were to regroup and await new orders in coordination with allied British and French forces. Commander-in-chief Edward Rydz-Śmigły

22356-517: The western border in Eastern Upper Silesia . Polish policy centred on their protection, especially since many politicians feared that if Poland retreated from the regions disputed by Germany, Britain and France would sign a separate peace treaty with Germany like the 1938 Munich Agreement and allow Germany to stay in those regions. The fact that none of Poland's allies had specifically guaranteed Polish borders or territorial integrity

22518-579: The western regions that were judged as indispensable for waging the war, taking advantage of the propitious conditions for counterattacks by reserve units and avoiding it from being smashed before the beginning of Franco-British operations in Western Europe. The operation plan had not been elaborated in detail and concerned only the first stage of operations. The British and the French estimated that Poland would be able to defend itself for two to three months, and Poland estimated it could do so for at least six months. While Poland drafted its estimates based upon

22680-474: The wider Operation Himmler . On 31 August, Hitler ordered hostilities against Poland to start at 4:45 the next morning. However, partly because of the earlier stoppage, Poland finally managed to mobilize only about 70% of its planned forces (only about 900,000 of 1,350,000 soldiers planned to mobilize in first order), and because of that many units were still forming or moving to their designated frontline positions. The late mobilization reduced combat capability of

22842-480: The world's best trained, as proven a year later in the Battle of Britain , in which the Poles played a notable part. Overall, the Germans enjoyed numerical and qualitative aircraft superiority. Poland had only about 600 aircraft, of which only PZL.37 Łoś heavy bombers were modern and comparable to their German counterparts. The Polish Air Force had roughly 185 PZL P.11 and some 95 PZL P.7 fighters, 175 PZL.23 Karaś Bs, 35 Karaś as light bombers. However, for

23004-497: The year 1919. When the Polish Ambassador Lipski , who met Ribbentrop on 30 August, declared that he did not have the authority to approve of these demands on his own, Ribbentrop dismissed him and his foreign office announced that Poland had rejected the German offer and further negotiations with Poland were abandoned. On 31 August, in a false flag operation German units, posing as regular Polish troops, staged

23166-429: Was a military conflict by the Soviet Union without a formal declaration of war . On 17 September 1939, the Soviet Union invaded Poland from the east, 16 days after Nazi Germany invaded Poland from the west. Subsequent military operations lasted for the following 20 days and ended on 6 October 1939 with the two-way division and annexation of the entire territory of the Second Polish Republic by Nazi Germany and

23328-525: Was a joint attack on the Republic of Poland by Nazi Germany , the Slovak Republic , and the Soviet Union , which marked the beginning of World War II . The German invasion began on 1 September 1939, one week after the signing of the Molotov–Ribbentrop Pact between Germany and the Soviet Union, and one day after the Supreme Soviet of the Soviet Union had approved the pact. One of the aims of

23490-697: Was a small fleet of destroyers , submarines and smaller support vessels. Most Polish surface units followed Operation Peking, leaving Polish ports on 20 August and escaping by way of the North Sea to join with the British Royal Navy . Submarine forces participated in Operation Worek , with the goal of engaging and damaging German shipping in the Baltic Sea , but they had much less success. In addition, many merchant marine ships joined

23652-536: Was accepted by Czechoslovakia on 1 October. This region had a Polish majority and had been disputed between Czechoslovakia and Poland in the aftermath of World War I. The Polish annexation of Slovak territory (several villages in the regions of Čadca , Orava and Spiš ) later served as the justification for the Slovak state to join the German invasion. By 1937, Germany began to increase its demands for Danzig, while proposing that an extraterritorial roadway, part of

23814-506: Was advocated by some generals, including Heinz Guderian , would have had the armour punching holes in the enemy's front and ranging deep into rear areas, but the campaign in Poland would be fought along more traditional lines. That stemmed from conservatism on the part of the German High Command, which mainly restricted the role of armour and mechanized forces to supporting the conventional infantry divisions. Poland's terrain

23976-515: Was also deputy to the Cipher Bureau's chief, Major (later, Lt. Col.) Gwido Langer , and in addition supervised the radio-intercept stations at Starogard in the Polish Corridor , at Poznań in western Poland, and at Krzesławice , near Kraków in southern Poland. In March 1943, now-Major Ciężki, Lt. Col. Langer, Lt. Antoni Palluth and civilians Edward Fokczyński and Kazimierz Gaca were betrayed by their French guide and captured by

24138-474: Was another Polish concern. These reasons made the Polish government disregard French advice to deploy the bulk of its forces behind natural barriers, such as the Vistula and San Rivers, despite some Polish generals supporting the idea to be a better strategy. The West Plan allowed the Polish armies to retreat inside the country, but that was supposed to be a slow retreat behind prepared positions intended to give

24300-546: Was assigned to Weiss . Due to its earlier participation in the Spanish Civil War , the Luftwaffe was probably the most experienced, best-trained and best-equipped air force in the world in 1939. Emerging in 1918 as an independent country after 123 years of the Partitions of Poland , the Second Polish Republic , when compared with countries such as United Kingdom or Germany, was a relatively indigent and mostly agricultural country. The partitioning powers did not invest in

24462-422: Was bluntly told that it was Britain's exclusive right to declare war on the Soviet Union or not. British Prime Minister Neville Chamberlain considered making a public commitment to restore the Polish state but eventually issued only general condemnations. This stance represented Britain's attempt at balance as its security interests included trade with the USSR that would support its war effort and might lead to

24624-663: Was clearly necessary for the safety of Russia against the Nazi menace. At any rate, the line is there, and an Eastern Front has been created which Nazi Germany does not dare assail. When Herr von Ribbentrop was summoned to Moscow last week it was to learn the fact, and to accept the fact, that the Nazi designs upon the Baltic States and upon the Ukraine must come to a dead stop. Since the Molotov-Ribbentrop Pact

24786-406: Was decided to temporarily implement the production of the fighter PZL P 11.G Kobuz. Nevertheless, due to the outbreak of the war, not one of the ordered 90 aircraft of this type were delivered to the army. The tank force consisted of two armored brigades, four independent tank battalions and some 30 companies of TKS tankettes attached to infantry divisions and cavalry brigades. A standard tank of

24948-826: Was increased while the number of service units, rear units and institutions was to be reduced. By the evening of 2 September enhanced defense and security measures were implemented at the Polish–Soviet border. Per instruction No. 1720 of the border troop commander in the Belorussian Military District , all detachments were set to permanent combat-ready status. The governments of allied Britain and France declared war on Germany on 3 September, but neither undertook agreed-upon military action nor provided any substantial support for Poland. Despite notable Polish success in local border battles, German technical, operational and numerical superiority eventually required

25110-468: Was initially inclined to order the eastern border forces to oppose the invasion, but was dissuaded by Prime Minister Felicjan Sławoj Składkowski and President Ignacy Mościcki . At 4:00 a.m. on 17 September, Rydz-Śmigły ordered the Polish troops to fall back, stipulating that they only engage Soviet troops in self-defense. However, the German invasion had severely damaged the Polish communication systems and caused command and control problems for

25272-814: Was maintained with five neighboring countries (Lithuania, Latvia, Soviet Union, Romania, and Hungary). In Pińsk , assembly of the PZL.37 Łoś planes continued in a PZL factory that had been moved out of Warsaw. A French Navy ship carrying Renault R35 tanks for Poland approached the Romanian port of Constanta . Another ship, with artillery equipment, had just left Marseilles . Altogether, seventeen French cargo ships were sailing towards Romania, carrying fifty tanks, twenty airplanes, and large quantities of ammunition and explosives. Several major cities were still in Polish hands, such as Warsaw, Lwów, Wilno, Grodno, Łuck, Tarnopol and Lublin (captured by German troops on 18 September). According to historian and author Leszek Moczulski , approximately 750,000 soldiers remained active in

25434-477: Was not an official alliance, modern scholarship has described the German and Soviet cooperation in the invasion of Poland as co-belligerence . In October 1939, Molotov reported to the Supreme Soviet that the Red Army had suffered 737 deaths and 1,862 wounded men during the campaign, a casualty rate that widely contradicted Polish specialist's claims of up to 3,000 deaths and 8,000 to 10,000 wounded. On

25596-553: Was recorded by Lev Mekhlis , who reported to Stalin that the people of the West Ukraine welcomed the Soviet troops "like true liberators". The Organization of Ukrainian Nationalists rebelled against Polish rule and Communist partisans stirred up local revolts, such as in Skidel . France and Britain refrained from a critical reaction to the Soviet invasion and annexation of Eastern Poland since neither country expected or wanted

25758-414: Was signed in 1921 and amended thereafter. The agreements were not strongly supported by the French military leadership and the relationship deteriorated during the 1920s and 1930s. The French correctly considered the German-Soviet alliance to be fragile and overt denunciation of, or action against the Soviet Union would serve neither France's nor Poland's best interests. Once the Soviets had occupied Poland,

25920-409: Was strong popular resentment to the War Guilt Clause, and post-colonial chauvinism (Italy) led to frenzied revanchism and territorial ambitions. Józef Piłsudski sought to expand the Polish borders as far east as possible in an attempt to create a Polish-led federation, capable of countering future imperialist action on the part of Russia or Germany. By 1920 the Bolsheviks had emerged victorious from

26082-412: Was to be supported by Panzers and small numbers of truck-mounted infantry (the Schützen regiments, forerunners of the panzergrenadiers ) to assist the rapid movement of troops and concentrate on localized parts of the enemy front , eventually isolating segments of the enemy, surrounding, and destroying them. The prewar "armoured idea", which an American journalist in 1939 dubbed Blitzkrieg , which

26244-478: Was well suited for mobile operations when the weather co-operated; the country had flat plains , with long frontiers totalling almost 5,600 km (3,500 mi). Poland's long border with Germany on the west and north, facing East Prussia, extended 2,000 km (1,200 mi). It had been lengthened by another 300 km (190 mi) on the southern side in the aftermath of the 1938 Munich Agreement. The German incorporation of Bohemia and Moravia and creation of

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