| Polish–Lithuanian War | |||||||||
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| Part of theLithuanian Wars of Independence and thePolish–Soviet War[1][2] | |||||||||
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| Belligerents | |||||||||
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| Commanders and leaders | |||||||||
| Casualties and losses | |||||||||
| 264 dead (incomplete data)[5] | 232 dead against the Polish army; 222 dead against Żeligowski's troops[5] | ||||||||
ThePolish–Lithuanian War was anundeclared war fought in theaftermath of World War I between newly independentLithuania andPoland, with fighting mainly in theVilnius andSuwałki regions, which was part of theLithuanian Wars of Independence and lasted from May 1919 to 29 November 1920.[3] Since the spring of 1920, the conflict happened alongside the widerPolish–Soviet War[6] and was affected by its progress. It was subject to unsuccessful international mediation at theConference of Ambassadors and theLeague of Nations.
After World War I, the military and political situation in the region was chaotic, as multiple countries, notably Lithuania, Poland, and Soviet Russia, vied with each other over control of overlapping areas.[a] The Polish–Lithuanian conflict was centered onVilnius,[3] which theCouncil of Lithuania declared the capital of therestored Lithuanian state.[7] Control of Vilnius was transferred from Germans to Poles on January 2, 1919, but the Polish paramilitary lost the city to the Bolsheviks onJanuary 5.[8] The Polish Armyseized Vilnius again on April 19, 1919[9] and came in contact with theLithuanian Army fighting in theLithuanian–Soviet War. Despite the antagonism over Vilnius, the Lithuanian and Polish armies sometimes cooperated when fighting against a common enemy, the Bolsheviks.[6] AsLithuanian–Polish relations worsened, theEntente drew two demarcation lines in hopes to stall further hostilities. The lines did not please either side and were ignored. The first clashes between Polish and Lithuanian soldiers occurred on April 26 and May 8, 1919, nearVievis.[10] With thePolish coup against the Lithuanian government failing in August 1919, the front stabilized until the summer of 1920.
In July 1920, Polish forces retreated due to reverses in the Polish–Soviet War and the Lithuanians followed the retreating troops to secure their lands as delineated in theSoviet–Lithuanian Peace Treaty. However, the Red Army was the first to enter Vilnius. In August 1920, Poland won theBattle of Warsaw and forced the Soviets to retreat. The Polish Army encountered Lithuanian opposition, defending their new borders, which the Polish government considered illegitimate. Thus, the Polish invaded Lithuanian-controlled territory during theBattle of Sejny. Pressured by the League of Nations, Poland signed theSuwałki Agreement on October 7, 1920. The agreement left theSuwałki region on the Polish side and drew a new incomplete demarcation line, which left Vilnius vulnerable to aflanking maneuver.[11]
On October 8, 1920, Polish generalLucjan Żeligowski staged amutiny, secretly planned and authorized by the Polish chief of stateJózef Piłsudski. Żeligowski's forces marched on Vilnius and captured it one day before theSuwałki Agreement was to formally come into effect.[12] Żeligowski proclaimed the creation of theRepublic of Central Lithuania with its capital in Vilnius. Theirfurther offensive towardsKaunas, thetemporary capital of Lithuania, was halted by the Lithuanians, who thus defended their independence. On November 29, 1920, a ceasefire was signed. Overall, from early 1919 to late 1920, Vilnius would switch rule[b] as many as seven times between Lithuanians, Poles and the Bolsheviks.[3] The Republic of Central Lithuania was incorporated into Poland as theWilno Voivodeship in 1922. The prolonged mediation by the League of Nations did not change the situation and thestatus quo was accepted in 1923. In March 1923, theConference of Ambassadors recognized the armistice line as ade jure Polish–Lithuanian border, awarding Vilnius to Poland.[20][21] However, theInternational Court of Justice inThe Hague arbitrated in 1931 that Poland broke international law by occupying Vilnius.[22] Lithuania remained adamant regarding its claim to Vilnius as its constitutional capital throughout the whole interwar,[21] and breaking alldiplomatic relations with Poland due to the latter's control of the city. Diplomatic relations were only restored as a result of the March1938 Polish ultimatum to Lithuania. Vilnius was regained by Lithuania on28 October 1939, following theSoviet–Lithuanian Mutual Assistance Treaty, twenty years after losing its capital. However, Lithuania as a whole lost its independence less than a year later following theSoviet ultimatum andoccupation of the Baltic states.
According to the1897 Russian census, the disputed city of Vilnius had a linguistic breakdown of30% Polish speaking, 40% Jews, and 2% Lithuanian speaking;[23][24] however the percentage of Lithuanian speakers in the surrounding countryside was a few times higher than that of Polish speakers – the population was 35% Lithuanian and 12% Polish speaking inVilnius county (if excluding its centre -Vilnius city),[25] whileTrakai county had 59% Lithuanian and 11% Polish speaking population.[26] According to the 1916 German census, Poles were the most numerous among all local nationalities and constituted 53%[27] or 53.67% of the city's population,[28] 50% in the entire Vilnius census region and the vast majority in the Vilnius census district.[27]
World War I ended when Germany signed theArmistice of 11 November 1918. On November 13,Soviet Russia renounced theTreaty of Brest-Litovsk[29] and began theSoviet westward offensive of 1918–1919. TheBolsheviks followed retreatingImperial German Army troops and attacked Lithuania and Poland from the east trying to prevent their independence. They attempted to spread theglobal proletarian revolution, establishSoviet republics in the region, and join theGerman and theHungarian Revolutions.[30] The Soviet offensive sparked a series of local wars, including thePolish–Soviet War and theLithuanian–Soviet War.
At the end of 1918, four groups claiming authority existed in Vilnius: the occupationalOber Ost German government, which was preparing to leave the city; the Lithuanian government underAugustinas Voldemaras that had just begun creating theLithuanian Army; the Polish Committee and the Polish Temporary National Council for Lithuania supported by armed units of theSelf-Defence of Lithuania and Belarus; andVilnius Soviet of Workers Deputies waiting for theRed Army.[31] The Germans refused to provide weapons to Polish paramilitary units which intended to fight the approaching Red Army. The Ober Ost command also denied the Polish request to grant thePolish Land Forces free passage to Vilnius.[32][33] The Polish Self-Defence was formally absorbed into the Polish Army at the end of December.[34] On 2 January 1919, Poles took over Vilnius from the retreating German troops and the fighting with the city's Bolshevik Worker'sSoviet (capturing around 1,000 weapons[35]).[17] Nonetheless, the last German soldiers left the city only on January 4.[36] The Lithuanian government failed to organize a defense of Vilnius.[37][38] Both the Polish and Lithuanian political leadership realized their inability to resist the invading Bolshevik forces.[39] So, onJanuary 2, theCouncil of Lithuania evacuated from Vilnius toKaunas.[40] After some fighting, the local Polish forces lost Vilnius to the Bolsheviks on January 5.[41][8] Lithuanians relied on the aid of German troops to stop the Red Army offensive before it reached Kaunas.[42]
At first, the Soviets were successful but this came to a halt in February 1919 due to failures at the battles ofJieznas,Kėdainiai, andAlytus. On February 5, Poland signed an agreement with Germany regulating the withdrawal of the German army fromwestern Belarus and giving the Polish army the opportunity to march eastward. On February 14, 1919, Polish troops came into contact with the Bolshevik army nearVawkavysk.[43] On April 16, 1919, the Polish Army launched a wide-rangingoffensive against the Bolsheviks fromLida to Vilnius.[44] On April 19, 1919, the Polish cavalry underWładysław Belina-Prażmowski captured Vilnius.[45] On April 22, 1919, Józef Piłsudski issued theProclamation to the inhabitants of the former Grand Duchy of Lithuania, in which he announced that the region's fate would be decided democratically. He also established theCivil Administration of the Eastern Lands, headed byJerzy Osmołowski [pl].[46] An important strategic success for the Polish side was the capture ofGrodno on April 28, 1919, from which the Germans withdrew.[47]
After that Polish troops advanced further west and northwest. The situation was utilized by the Lithuanian army, which entered Ukmergė on May 3, and started an offensive further south and southwest.[6]Polish–Lithuanian relations at the time were not immediately hostile, both armies met in several points (Merkinė,Vievis andŠirvintos), and even cooperated against the Bolsheviks in Giedraičiai area on May 11, 1919.[48]
At first, both Poles and Lithuanians cooperated against the Soviets, but soon the cooperation gave way to increasing hostility.[49][48] Lithuania claimedneutrality in the Polish–Soviet War. As the Polish Army forced its way further into Lithuania, the first clashes between Polish and Lithuanian soldiers occurred on April 26 and May 8, 1919, nearVievis.[10] Though there was no formal state of war and few casualties, by July newspapers reported increasing clashes between Poles and Lithuanians, primarily around the towns ofMerkinė andŠirvintos.[50] Direct negotiations in Kaunas between May 28 andJune 11, 1919, collapsed as neither side agreed to compromise. Lithuania tried to avoid direct military conflict and submitted its case for mediation to the Conference of Ambassadors.[51]
In theSuwałki region, Lithuanian troops, supported by German troops, were advancing in a southerly direction. The entire region was under the control of the German army, which allowed in the southern part to organize Polish administrations and to hold elections to the Polish Sejm in the counties ofAugustów,Suwałki andSejny. However, at the same time, they allowed the formation of Lithuanian administrations in the northern part.[52] Lithuanians controlled Sejny from mid-1918, and entered Suwałki on May 8, 1919.[53]
While still World War I was still ongoing, under German tutelage, the two sides established diplomatic ties, signing an agreement in Berlin on 30 June 1918.[54] Lithuania was represented byAugustinas Voldemaras andKonstantinas Olšauskas, while Poland was represented byAdam Ronikier.[54] Both sides recognized each other's statehood.[55] In the treaty, Lithuania guaranteed the rights of the Polish minority, while Poland promised to refrain from anti-Lithuanian propaganda.[56] Voldemaras later maintained that Ronikier renounced Polish claims to Vilnius.[57] However,Alfred E. Senn wrote that the issue of the border and the belonging of Vilnius was not addressed in the treaty,[55] while according toPranas Čepėnas andWiktor Sukiennicki [pl] the signed agreement mentioned nothing regarding territorial questions.[57] The treaty (published in full byRaimundas Lopata [lt]) was of interim nature and stated only that: "With regard to the frontier, a principle of a common frontier is accepted, which will be determined by a joint agreement based on ethnic, historic and economic principles".[58] After the Germans had withdrawn, the Lithuanian side pressed for Poland's recognition of an independent Lithuania with its capital in Vilnius, which the Polish leadership consistently rejected.[59]
Polish leader Józef Piłsudski hoped to revive the oldPolish–Lithuanian Commonwealth (see theIntermarium federation) and campaigned for some kind of Polish–Lithuanian union in theParis Peace Conference.[59] OppositionalEndecja desired Lithuania's annexation to Poland,[60] with granting Lithuanians territorial autonomy within ethnic boundaries.[61] Poland also did not intend to make any territorial concessions and justified its actions not only as part of a military campaign against the Soviets but also as the right of self-determination of local Poles.[62] Due to Polish–Lithuanian tensions, theAllied Powers withheld diplomatic recognition of Lithuania until 1922.[63]
The Lithuanians claimed Vilnius as their historical capital and refused any federation with Poland, desiring an independent Lithuanian state. They regarded Polish federalism as a recreation of Polish cultural and political dominance.[59] The Lithuanian government inKaunas, designated as thetemporary capital, deemed the Polish presence in Vilnius as an illegal occupation.[64] In addition to the Vilnius Region, the Suwałki Region was also disputed. It had a mixed Polish and Lithuanian population.[65]
At the time the international situations of newly independent Poland and Lithuania were unequal. Poland, much larger in territory and population, was dedicated point #13 inWoodrow Wilson'sFourteen Points. It was recognized by all nations of the Entente, officially invited to theParis Peace Conference, and became one of the founding members of theLeague of Nations.[66] Poland also enjoyed a closealliance with France.
Lithuania did not receive international recognition (it was first recognizedde jure in July 1920 bySoviet Russia as part of the peace treaty) as the Entente hoped to revive the Russian Empire within its former territory, which included Lithuania.[67] Lithuania was looking for support inGermany and Russia. In Paris, Voldemaras made contact with Russian delegates to the Paris Conference, who resented an independent Poland and were also interested in limiting its influence in the east and blocking a Polish-Lithuanian agreement. However, they had no real power in Russia, besides that they themselves considered Lithuania part of Russia, so no agreement was reached.[68] Contacts with the Germans were much more fruitful. Germany realized that France was interested in a strong Polish ally east of Germany. So, for their part, they supported the building of Lithuania, which would be unfriendly to Poland. Threatened from both sides, the Lithuanian government turned to Germany for military and financial assistance.[69] German troops remained in Kaunas in early 1919, and the government was supported by German loans.[70] The military presence in Lithuania also gave Germany cover for East Prussia and the ability to control the situation in Russia.[68]
The Lithuanian delegation was also present at the Paris Peace Conference, where its leader Augustinas Voldemaras focused on receiving recognition of independent Lithuania and its borders. Voldemaras demanded 125,000 square kilometers for Lithuania, not only with Vilnius but alsoSuwałki andBiałystok. He also accused Poland of being partitionist, and portrayed Poland as an anti-Semitic state that was a threat toLithuanian Jews.[61] On the other hand, Voldemaras battled negative propaganda that theCouncil of Lithuania was a German puppet, that Lithuanians harboured pro-Bolshevik attitudes,[66] or that Lithuania was too small and weak to survive without a union with Poland.[71] Under article 87 of theVersailles Treaty, thePrincipal Allied Powers reserved to themselves the right to determine Poland's eastern frontier.[72][73]
The war situation and the unstable political situation in both countries did not facilitate contacts between the two governments. Lithuanians protested the presence of Polish troops on Lithuanian territory in early January 1919, but the information reached Warsaw when Vilnius was already in Bolshevik hands. The Poles responded on February 12 by rejecting Lithuanian demands for lands they considered their own, but offered to open direct diplomatic talks. The Lithuanian delegation reached Warsaw on April 18, a day before the entrance of Polish troops to Vilnius.[74]
Meanwhile,Michal Römer, a Lithuanian patriot and veteran ofPolish Legions under Piłsudski, went to Kaunas on a mission, and was expected to convince Lithuanian politicians of federation. However, he only found understanding among Lithuanians of Polish culture.[53] On April 17, Lithuanian politicians categorically rejected the federation's proposals.[53]
The Lithuanian delegation, led byJurgis Šaulys, held talks with Polish Prime MinisterIgnacy Jan Paderewski on May 13 and 23, and with Polish Head of StateJózef Piłsudski on May 21.[75] The Polish side, strengthened by its possession of Vilnius, insisted on the establishment of a federation, with a common foreign policy, army command, railroad, treasury and post office, promising to establish borders favorable to Lithuania.[76] The Lithuanian side, on the other hand, demanded recognition of an independent Lithuania with Vilnius as its capital.[76] The talks failed, with the only result being the establishment of a Lithuanian consulate in Warsaw, headed byAntanas Kasakaitis [lt].[53]
The Conference of Ambassadors drew the firstdemarcation line on June 18, 1919.[77] The line, drawn about 5 km (3.1 mi) west of theGrodno–Vilnius–Daugavpils Railway, was based on the military situation on the ground rather than ethnic composition.[77][78] Neither Poles nor Lithuanians were content with the line. The Polish Ministry of Foreign Affairs rejected the line as it would require the Polish forces to retreat up to 35 km (22 mi).[78] The line also left the entireSuwałki region, with exception ofAugustów, on the Lithuanian side.[53] The Lithuanians protested leaving Vilnius andGrodno under Polish control.[78] As German volunteers were departing from Lithuania and Lithuanian forces were preoccupied with battles against the Soviets in northern Lithuania, Poland ignored the demacration line and moved its forces on a 100 km (62 mi) wide front 20–30 km (12–19 mi) deeper eastward.[79]
On July 18,Ferdinand Foch proposed the second demarcation line, known as theFoch Line.[80] It was approved by the Entente on July 26. The Lithuanians were informed about the new line only on August 3.[81] Two major modifications favorable to the Poles were made: the Suwałki Region was assigned to Poland and the entire line was moved about 7 km (4.3 mi) west.[82] Again, both Poles and Lithuanians protested the line as it would require them to withdraw their armies from the Vilnius and Suwałki Regions respectively. The German administration, which had not yet retreated from the Suwałki Region, also opposed the Foch Line.[83] The new line did not immediately halt the hostilities. After a couple of Polish attacks on July 29 and August 2, the front stabilized.[84]
The Lithuanians retreated from Suwałki on August 7, 1919.[85] However, they stopped in ethnically mixedSejny and formed a line on theCzarna Hańcza River –Wigry Lake.[86] They showed their intention to stay there permanently, which caused concern among the local Poles. On August 12, they organized a rally in Suwałki demanding incorporation into Poland.[86] Lithuanians also held a rally in Kaunas on August 17 protesting the Foch line, and a similar rally was later held in Sejny, where Prime MinisterMykolas Sleževičius arrived.[87]
The Sejny branch ofPolish Military Organisation (PMO) began preparing for an uprising, scheduled for the night of August 22 to 23, 1919, right after German troops left the city. Between 900[86] and 1,200 partisans[80] joined PMO forces. On August 23, the Poles captured Sejny and attackedLazdijai andKapčiamiestis, towns on the Lithuanian side of the Foch Line.[86] The insurgents planned to march as far asSimnas.[80] Lithuanians recaptured Sejny on August 25 for a few hours. On August 26, regular Polish forces – the41st Infantry Regiment [pl] – joined the PMO volunteers.[80] On September 5, the Lithuanians agreed to withdraw behind the Foch Line by September 7.[88] Poland secured Sejny and repressed Lithuanian cultural life: theSejny Priest Seminary was expelled, Lithuanian schools and cultural organizations closed.[89] After the uprising, the mistrust of Poles prompted Lithuanian intelligence to intensify its investigations of Polish activities in Lithuania. This helped to detect and prevent a plannedcoup d'état in Kaunas to overthrow the government of Lithuania.[80]
Sometime in mid-July 1919,[90] PMO forces in Vilnius began planning a coup to replace the Lithuanian government with a pro-Polish cabinet, which would agree to a union with Poland (the proposedMiędzymorze federation). Polish leader Józef Piłsudski believed there were enough Polish sympathizers in Lithuania to carry out the coup.[80] On August 3, a Polish diplomatic mission, led byLeon Wasilewski andTadeusz Kasprzycki, in Kaunas had a double purpose: propose aplebiscite in the contested territories[91] and assess preparedness for the coup.[92] On August 6, the Lithuanian government rejected the plebiscite proposal, stating that the disputed territories constituteethnographic Lithuania.[91] According to Lithuanian historianKazys Ališauskas, PMO planned to capture and hold Kaunas for a few hours until the arrival of the regular Polish troops, situated only some 40–50 km (25–31 mi) east from the city.[93] Piłsudski and his entourage were sincerely convinced thatTaryba, who ruled Lithuania, had no real popular support and was merely a German creation. They were bolstered in this conviction by intra-Lithuanian quarrels, primarily between Lithuanian émigré leaderJuozas Gabrys and newly elected PresidentSmetona, who lacked democratic legitimacy. This conviction was reinforced by the constant presence of the German army in Lithuania.[94] The Germans' departure from Kaunas on July 11, 1919, created the conditions for military action.[95] Polish newspapers ran a propaganda campaign claiming that theCouncil of Lithuania was simply a German puppet.[96]
It managed to win the support of some Lithuanian politicians, most notably the aforementioned Gabrys, Defense Ministry employeeJurgis Aukštuolaitis, and even Lithuanian army commander Silvestras Žukauskas. However, it was not much, greater success was achieved in gaining the support of Kaunas Poles.[97] The coup was initially scheduled for the night of August 27 to 28 but was postponed to September 1.[98] The outbreak of the Sejny uprising, which reinforced resentment against Poles in Lithuania, further hindered the success of the coup.[99]
The postponement of the start of the coup turned out to be a fatal mistake, as some PMO units did not receive information about it and began operations on the original date, disrupting telegraph connections between Kaunas and the rest of the country.[99] Lithuanian intelligence discovered the coup, but did not have a list of PMO members. Lithuanian authorities began mass arrests of some 200 Polish activists, including 23 officers of the Lithuanian Army.[100][101] Kaunas was declared in astate of siege. Polish press saw mass arrests of Polish activists "to whom no charge can be ascribed other than being Poles" as proof of systematic anti-Polish policies of the German-ridden Lithuanian government.[102] Another wave of arrests took place on September 9 in Kaišiadorys, an important railroad junction, where about 100 people were arrested.[103] The PMO was little affected by the arrests and scheduled another coup attempt for the end of September. However, the Lithuanians obtained a full list of PMO members, including 369 names of members and 122 names of Lithuanians sympathetic to the PMO, and liquidated the organization in Lithuania.[104][105] The wave of arrests, included names outside the list, Lithuanian police used this as a pretext to arrest Polish activists, there were even murders.[105]
After the failure of the coup in Kaunas, there were numerous small border incidents. On September 17 and 18, Lithuanian troops attacked and occupied Musninkai and Širvintos, and were soon driven from them.[106] On September 19, 1919, Polish troops attackedGelvonai and encroached towardsUkmergė.[107] On several occasions fights broke out regarding a strategically important bridge over theŠventoji River nearVepriai.[108] In October, when main Lithuanian forces were deployed against theBermontians in northwestern Lithuania, the attacks intensified. Poles capturedSalakas on October 5[93] and attackedKapčiamiestis on October 12.[88] When Polish troops were engaged in combat with Soviet forces German troops attacked Alanta onJanuary 11, 1920, and Stakliškės on January 14.[109] The front stabilized, but harassment of border guards and local villagers continued throughout early 1920.
In March 1920, fights erupted along the railroad stations inKalkūni andTurmantas.[110][111] The situation was investigated by British and French observers and reported to the Entente. The situation somewhat improved only in late spring 1920, when most Polish troops were deployed in Ukraine during thePolish–Soviet War.[93]
At the time Lithuania faced a severe budget crisis – in 1919 its revenue was 72 million while expenses reached 190 millionGerman marks.[112] While the government was struggling to obtain financial assistance and loans, deep cuts affected the army. Instead of increasing its armed forces to 40,000 men, Lithuania was forced to cut them to about 25,000.[113]
After the failed coup, Leon Wasilewski left Kaunas and settled in Vilnius. There he met twice, on September 15 and 24, with Lithuanian Foreign MinisterAugustian Voldemaras. The talks concerned bilateral relations, the possibility of a plebiscite, and ended without any concrete agreements.[114] Wasilewski then began propaganda work involving Lithuanian activists Józef Albin Herbaczewski, priest Antanas Viskantas orJurgis Aukštuolaitis, who had been released from prison, and published bilingual or Lithuanian-language press for this purpose.[115]
Meanwhile, British influence was increasing in the Baltic States, interested primarily in limiting German, but also French influence.[116] A British military mission was established in Kaunas, headed by Richard Barrington Ward. On September 19, 1919, along with 21 other British officers, GeneralFrank Percy Crozier joined the newly established Lithuanian Army as an advisor to the General Staff. On September 25, 1919, the UK recognized the Lithuanian state de facto. The British also provided military equipment.[116]
Latvia fought against theGerman-Russian forces ofPavel Bermondt-Avalov. Latvia enjoyed the support of Poland. The fighting spread to Lithuania in October 1919. Poland offered to help, but the Lithuanians refused to allow passage through their territory. Fearing a Polish attack, Lithuania reached an agreement with the Bermontians and signed a truce on October 30, establishing the Tauragė-Šiauliai demacration line.[117] After the Latvian army breached the front, the Lithuanian army joined the counteroffensive. Later clashes were stopped by the intervention of anEntente representative, in order to not interrupt withdrawal of German troops. By December 15, all German forces were completely removed from Lithuania. At the same time, the plenipotentiary of the German governmentLudwig Zimmerle [de] was forced to leave Kaunas.[118] On December 30, a Polish-Latvian alliance was signed, resulting in a joint fight for the liberation ofDaugavpils, which was successfulon January 5, 1920. Lithuanian troops attempted an early entry into the city, but without success.[119]
In April 1920, Lithuania held its first parliamentary elections, among the constituencies established were cities outside the Lithuanian administration: Vilnius,Lida,Grodno andBiałystok. The Polish minority had limited opportunities for election campaigning, the only Polish newspaper was closed down, and as a result Poles received only 3 parliamentary seats.[120]Kazys Grinius became the new prime minister. On May 11, 1920, France recognized Lithuania de facto.[121] And on May 7, 1920, Lithuania began peace talks with Soviet Russia.[122]
On 25 April 1920, the Polish army and the remnants ofUkrainian People's Army underPetliura launched the large-scaleKiev offensive following thetreaty of alliance.[123] Initially successful, the Polish Army started retreating after Russian counterattacks in early June 1920.[124] Soon the Soviet forces began to threaten Poland's independence as they reached and crossed the Polish borders. On July 9, Polish Prime MinisterWładysław Grabski asked theAllied Powers in theSpa Conference for military assistance in the war with the Soviets.[125] The conference proposed that the Polish forces would withdraw behind theCurzon Line, the Soviet forces would stop 50 km (31 mi) to the east of the line, the Lithuanian forces would take control of Vilnius, and all other disputes would be settled via negotiations in London.[62] Grabski opposed the transfer of Vilnius, but under the pressure of British Prime MinisterLloyd George, agreed to the resolution on July 10.[126]
At the same time, the Soviets and Lithuanians negotiated theSoviet–Lithuanian Peace Treaty, which was signed on July 12, 1920. Russia recognized Lithuanian independence and withdrew any territorial claims. The treaty drew the eastern border of Lithuania, which the Lithuanians continued to claim as theirde jure state border until World War II.Vilnius Region, includingBraslaw (Breslauja),Hrodna (Gardinas),Lida (Lyda), andVilnius, was recognized to Lithuania.[127] On August 6, after long and heated negotiations, Lithuania and Soviet Russia signed a convention regarding the withdrawal of Russian troops from the recognized Lithuanian territory.[128] However, the troops began to retreat only after the Red Army suffered a heavy defeat in Poland.[129]
The Bolshevik forces reached Lithuanian territory on July 7, 1920, and continued to push the Polish troops.[93] The Lithuanian Army moved to secure territories abandoned by the retreating Polish forces, reachingTurmantas on July 7,Tauragnai andAlanta on July 9,Širvintos andMusninkai on July 10,Kernavė,Molėtai, andGiedraičiai on July 11,[130]Maišiagala andPabradė on July 13.[131] On July 13, the Polish command decided to transfer Vilnius to the Lithuanians following the Spa conference's resolution.[132] Lithuanians moved in, but their trains were stopped by Polish soldiers near Kazimieriškės.[131] Polish soldiers didn't receive orders to let Lithuanian troops go through.[133] This delay meant that the Bolsheviks were the first to enter Vilnius on July 14. By the time the first Lithuanian troops entered the city on July 15, it was already secured by the Soviets.[134] Poland sought to have Russians in the city as it would create much fewer complications when the Polish Army counterattacked.[134] Despite the Peace Treaty, the Soviets did not intend to transfer the city to the Lithuanians.[132] Indeed, there were indications that the Soviets planned a coup against the Lithuanian government in hopes to re-establish theLithuanian SSR.[124][135]
Despite the setback in Vilnius, the Lithuanians continued to secure territories in the Suwałki Region. They tookDruskininkai on July 17,Vištytis,Punsk,Giby, andSejny on July 19, Suwałki on July 29,[129] Augustów on August 8.[136] The Polish units, afraid of being surrounded and cut off from the main Polish forces, retreated towardsŁomża. The Lithuanian authorities started to organize themselves in the regained areas.[136]
Poland claimed that Lithuania violated its claim to neutrality in the Polish–Soviet War and in effect became a Soviet ally.[137] A secret clause of the Soviet–Lithuanian Peace Treaty allowed Soviet forces unrestricted movement within the Soviet-recognized Lithuanian territory for the duration of Soviet hostilities with Poland.[124] This clause was of a practical matter: Soviet troops already occupied much of the assigned territory and could not withdraw while hostilities with Poland continued.[138] Lithuanians were also simply unable to resist Soviet troops.[139] For example, when Lithuanians refused permission to use a road, the Soviets ignored Lithuanian protests and transported their troops and equipment regardless.[128] At the same time Polish soldiers were disarmed and interned. The largest group, a brigade under colonel Pasławski, was interned on July 18, 1920, nearKruonis.[140] On August 10, Lithuanians held 103 Polish officers and 3,520 private soldiers.[136] Poland also claimed that the Lithuanian troops actively participated in the Red Army's military operations.[141] This charge, based on memoirs of Soviet officials, lacks evidence.[142] Further military clashes between Polish and Lithuanian troops in the Suwałki Region were interpreted by Poland to show that "the Lithuanian government has become an instrument of the Soviet government."[143] Lithuania responded that it was defending its borders.[143]
The Russians suffered a great defeat in theBattle of Warsaw in mid-August 1920 and started withdrawing. They handed over Vilnius to the Lithuanians on August 26.[132] The Lithuanians hastily made preparations to secure the border, as determined by the Soviet–Lithuanian Peace Treaty. The soldiers were ordered to maintain neutrality: avoid hostilities andintern any Soviet or Polish troops that would cross the border.[144] On August 26, a Polish delegation, led by ColonelMieczysław Mackiewicz, arrived in Kaunas to negotiate the situation.[145] The Poles, lacking authority to discuss political issues, were concerned with military aspects. They sought permission to transport Polish troops through the territory of Lithuania, wanted access to a portion of theSaint Petersburg–Warsaw railway, and demanded that the Lithuanian troops would withdraw from the Suwałki Region behind theCurzon Line.[145] The Lithuanians refused to discuss military matters without a clear political Polish–Lithuanian border, that would be respected after the war.[145] Due to these fundamental disagreements and Polish attacks, the negotiations broke down on August 30.[146]
The Suwałki Region had strategic importance in the Polish–Soviet War. Following orders ofEdward Rydz-Śmigły, Polish forces took Augustów from Lithuanians in a surprise attack on August 28.[146] Confused and disoriented, Lithuanians retreated from Suwałki and Sejny on August 30 and 31.[93] The Lithuanians reorganized, gathered their forces (11 battalions with 7,000 soldiers),[147] and organized a counterattack to retake lost territory on September 2.[93] The goal was to take and secure the Augustów–Lipsk–Grabowo–Grodno line.[93] The Lithuanians succeeded in re-taking Sejny and Lipsk and by September 4 reached the outskirts of Augustów.[93] On September 5, the Poles counterattacked and forced the Lithuanians to retreat.[148] On September 9, the Polish forces recaptured Sejny,[149] but the Lithuanians pushed back and regained Sejny and Giby on September 13 and 14.[150] Pending direct negotiations, hostilities were ceased on both sides.[151]
On September 6, Lithuanian Foreign MinisterJuozas Purickis proposed direct negotiations inMarijampolė.[152] On September 8, during a planning meeting of theBattle of the Niemen River, the Poles decided to manoeuvre through the Lithuanian-held territory to the rear of the Soviet Army, stationed in Grodno.[153] In an attempt to conceal the planned attack, Polish diplomats accepted the proposal to negotiate.[153] The negotiations started on September 16 inKalvarija, but collapsed just two days later.[154]
On September 5, 1920, Polish Foreign MinisterEustachy Sapieha delivered a diplomatic note to theLeague of Nations alleging that Lithuania violated its neutrality and asked to intervene in the Polish–Lithuanian War.[155][156] The League agreed to mediate and began its session on September 16. The resolution, adopted on September 20, urged both states to cease hostilities and adhere to the Curzon Line.[157] Poland was asked to respect Lithuanian neutrality if Soviet Russia agreed to do the same. Also, a special Control Commission was to be dispatched to the conflict zone to oversee the implementation of the resolution.[158] It was clear that the League had only a narrow goal to prevent armed hostilities and not to resolve the underlying territorial dispute.[139][159] The Lithuanian government accepted the resolution, but Poland reserved full freedom of action in preparation for the attack on the Soviets.[160][161]
On September 22, 1920, Poland attacked Lithuanian units in the Suwałki Region on a wide front.[159] Overwhelmed by 4–5 times larger Polish forces,[162] some 1,700[161]–2,000[163] Lithuanian troops surrendered and were taken prisoner.
Polish forces then marched, as planned on September 8, across theNeman River nearDruskininkai andMerkinė to the rear of the Soviet forces near Grodno and Lida.[164] The Red Army hastily retreated. The Lithuanians had had limited intelligence warning that such an attack might occur,[162] but chose an inadequate defensive strategy and spread their forces too thinly along the entire Polish–Lithuanian front[163] without sufficient forces to protect the bridges across the Neman.[165] This attack, just two days after the resolution by the League of Nations to cease hostilities, put more pressure on Poland to settle the dispute peacefully.[166]
On September 26, the Poles captured Grodno[164] and the Polish foreign minister proposed new negotiations in Suwałki.[167] The Battle of the Niemen River drastically altered the balance of power: Vilnius, in Lithuanian hands since August 26, was now exposed to a Polish attack.[168] Indeed, the Poles had already decided to capture the city and used the negotiations in Suwałki to stall and buy the time necessary to make preparations.[169][170] The Lithuanian side was ready to give up the Suwałki Region in exchange for Poland's recognition of the Lithuanian claims to Vilnius.[171]
The negotiations between Poles, led bycolonelMieczysław Mackiewicz, and Lithuanians, led bygeneralMaksimas Katche, began on the evening of September 29, 1920.[171] Both sides agreed to anarmistice but only to the west of the Neman River (the Suwałki Region).[172] Fighting to the east of the river continued aroundMarcinkonys,Zervynos,Perloja,Eišiškės.[173] The major point of contention, both diplomatic and military, was the train station inVarėna (Orany) on theSaint Petersburg–Warsaw railway. Major Lithuanian forces were still concentrated in the Suwałki Region and moving them to protect Vilnius without the railway would be extremely difficult.[172] Fighting east of the Neman River ceased only on October 6, when Polish troops had already captured the train station in Varėna.[154]
Negotiations regarding the demarcation line were difficult. In essence, the Lithuanians wanted a longer demarcation line to provide better protection for Vilnius. The Poles agreed only to a short line to provide the planned attack on Vilnius with space for operation.[174] The Polish delegation was also stalling to buy time for necessary preparations for an attack on Vilnius.[169][172] While Vilnius was not a topic of debate, it was on everybody's mind.[159] On October 4, the Control Commission, sent by the League according to its resolution of September 20, arrived to Suwałki.[161] The commission, led by French colonel Pierre Chardigny, re-energized the negotiations.[174] On October 7, at midnight,[174] the final agreement was signed. The treaty made not a single reference to Vilnius or the Vilnius Region.[175] The ceasefire was effective only along the demarcation line, which ran through the Suwałki Region to the train station inBastuny. [pl][175] Thus the line was incomplete, did not protect the Vilnius Region,[176] but indicated it would be left on the Lithuanian side.[177]
Polish chief of state Józef Piłsudski ordered his subordinate, GeneralLucjan Żeligowski, to stage a mutiny with his1st Lithuanian–Belarusian Division (16 battalions with 14,000 soldiers)[178] inLida and capture Vilnius infait accompli. The rebellion had two main goals: capture Vilnius and preserve Poland's international reputation. The League of Nations was mediating other Polish disputes, notably over theFree City of Danzig andUpper Silesia, and direct aggression against Lithuania could have hampered Polish bargaining positions.[179] While the Polish side officially held Żeligowski to be a deserter and did not support him,[135] Poland provided logistic support, including munitions and food rations,[180] to his units.[181][182] Żeligowski also received reinforcements, when, according to the official version, the mutiny spread further among the Polish troops.[154][183] His initial attack was secured on both sides by two Polish Armies.[184]
Żeligowski's Mutiny, in planning since mid-September,[166] began in the early morning of October 8, 1920, just a few hours after the signing of the Suwałki Agreement.[185] A provisional agreement was made in the Polish–Soviet War, which freed up Polish units for the attack on Lithuania.[176] As part of the ruse, Żeligowski wrote a note to the Polish command announcing his mutiny and expressing his disappointment with the Suwałki Agreement.[185] He claimed that his troops marched to defend the right ofself-determination of the local Polish population.[185]
The Lithuanians were not prepared for the assault. They had only two battalions, stationed nearJašiūnai andRūdninkai [lt] along theMerkys River, shielding the city from Poland.[154] Their main forces were still in the Suwałki Region and to the west fromDruskininkai andVarėna. Without the railway, Lithuanian units could not be easily redeployed to protect Vilnius.[176] After it became clear that Żeligowski would not stop in Vilnius, Commander of the Lithuanian ArmySilvestras Žukauskas, who had recently taken the position on October 6, ordered the city evacuated in the afternoon on October 8.[154] They left the city's administration to Entente official Constantin Reboul.[186] The first Polish units entered the city around 2:15 PM on October 9, Żeligowski entered Vilnius in the evening the same day.[187][c] He did not recognize Reboul's authority and Entente officials left the city in protest.[189] On October 12, Żeligowski proclaimed the independence of theRepublic of Central Lithuania, with Vilnius as its capital.[188] The name aligned with Piłsudski's vision of historical Lithuania, divided into three cantons: Lithuanian-inhabited Western Lithuania with its capital inKaunas, Polish-inhabited Central Lithuania with its capital in Vilnius, and Belarusian-inhabited Eastern Lithuania with its capital inMinsk.[188] Further developments of other cantons were prevented byPolish National Democracy, a party opposed to Piłsudski's federalist ideas.[188]
Żeligowski's units continued to advance: territories east of the city were taken without resistance[190] while Lithuanians defended in the west. Żeligowski tookŠvenčionys andRūdiškės on October 10,Nemenčinė on October 11,Lentvaris on October 13,Rykantai on October 15.[154] The front somewhat stabilized on the southern (left) side of theNeris River, but fighting continued on the northern (right) side of Neris.[191] On October 18, the Lithuanian army began a failed counteroffensive trying to retake Vilnius.[192] When Polish cavalry manoeuvred towardsRiešė, it learned from the local population the location of the command of the 1st Riflemen Division.[193] On October 21, the cavalry raided the village and took the entire command (includingStasys Nastopka) prisoner. Left without their commanders, the Lithuanians retreated and Poles tookMaišiagala andPaberžė.[194] Żeligowski at this point offered peace negotiations but was refused by the Lithuanian command.[192] On October 26, another cavalry raid capturedDubingiai,Giedraičiai andŽelva and threatenedUkmergė.[195] However, Lithuanians counterattacked and took back Želva on October 30 and Giedraičiai on November 1. For a while, the front stabilized.[191]
On November 17, the mutineers began a major attack. They planned to capture Kaunas, thus threatening Lithuanian independence,[196] by encircling the city from the north throughŠirvintos–Ukmergė–Jonava and Giedraičiai–Kavarskas–Kėdainiai.[191] Żeligowski's forces were about three times larger: 15 Polish battalions against 5 Lithuanian battalions.[197] One cavalry brigade managed to break through the Lithuanian defence lines near Dubingiai, reached Kavarskas, and continued towards Kėdainiai.[191] However, Lithuanians successfully stopped an attack on Ukmergė near Širvintos on November 19. About 200 Lithuanians manoeuvred through swamps to the rear of three Polish battalions.[198] Attacked from the front and rear, some 200 Poles were taken prisoner while others retreated.[199] The Lithuanians continued to attack and captured Giedraičiai on November 21. On the same day, a ceasefire was signed under pressure from the League of Nations.[200] The Polish cavalry brigade, pushed from Kėdainiai and cut off from its main forces, retreated throughRamygala–Troškūnai–Andrioniškis–Leliūnai[201] and rejoined Żeligowski's other units only on November 24.[200]
On October 11, 1920, the Lithuanian envoy in ParisOscar Milosz asked the League of Nations to intervene in the renewed conflict with Poland.[202] On October 14, the Chairman of the LeagueLéon Bourgeois issued a note condemning the aggression and asking Polish units to retreat.[203] Politicians in London even considered expelling Poland from the League.[204] When the League heard both arguments on October 26–28, Polish envoySzymon Askenazy claimed that there was no conflict between Poland and Lithuania to mediate.[205] He maintained that the old conflict ended with signing ceasefires with Lithuania on October 7 and with Soviet Russia on October 12 and the new conflict was caused by Żeligowski,[205] who acted without approval from the Polish command, but with the moral support of the entire Polish nation.[206] Lithuanian envoyAugustinas Voldemaras argued that Poland orchestrated the mutiny and demanded strict sanctions against Poland.[207] The League refused to validate Żeligowski's action.[206] It suggested to hold aplebiscite in the contested areas. On November 6 and 7, both sides agreed[207] and Lithuanians began preparatory work.[208]
On November 19, Żeligowski proposed to the Control Commission, led by Chardigny, to cease hostilities.[209] Lithuanians agreed and a ceasefire was signed on November 21. Later this episode was criticized by Lithuanian commentators as at the time the Lithuanian Army had the initiative in the front and had a chance of marching on Vilnius.[196] However, the Lithuanians trusted the League of Nations would resolve the dispute in their favour[179] and were afraid that in case of an attack on Vilnius regular Polish forces would arrive to reinforce Żeligowski's units.[210]
Negotiations for a more permanent armistice, under the mediation of the Control Commission, began on November 27 in Kaunas.[210] Lithuania did not agree to negotiate directly with Żeligowski and thus legitimizing his actions.[196] Therefore, Poland stepped in as a mediator. Lithuania agreed as it hoped to put the talks back into the context of theSuwałki Agreement.[211] Poles rejected any withdrawal of Żeligowski's forces. No agreement could be reached regarding a demarcation line. On November 29, 1920, it was agreed only to cease hostilities on November 30, to entrust the Control Commission with the establishment of a 6 km (3.7 mi) wide neutral zone and to exchange prisoners.[210] The neutral zone existed until February 1923.[200]
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The result of this war was that while Lithuania defended its independence against Poland and its puppet stateCentral Lithuania, Lithuania also lost a third of its territory and its capital. The issue would not be laid to rest during the interwar as no peace treaty was ever signed, andLithuania–Poland relations were broken off until the1938 Polish ultimatum to Lithuania. In 1920–1939, Lithuania and Poland were separated by ademarcation line that mostly followed theFoch Line, which meant thatVilnius andSuwałki region were under Polish rule.
In March 1921, the plans for a plebiscite were abandoned. Neither Lithuania, which was afraid of a negative result nor Poland, which saw no reason to changestatus quo, wanted the plebiscite.[211] The parties could not agree on which territory to carry out the vote and how Żeligowski's forces should be replaced by League's forces.[211] The League of Nations then moved on from trying to solve the narrow territorial dispute in the Vilnius Region to shaping the fundamental relationship between Poland and Lithuania. In 1921, BelgianPaul Hymans suggested several Polish–Lithuanian federation models, all rejected by both sides.[212] In January 1922,parliamentary election to the Wilno Diet (Sejm wileński) resulted in a landslide Polish victory. In its first session on February 20, 1922, the Diet voted for incorporation into Poland as theWilno Land and thenVoivodeship.[213] PolishSejm accepted the resolution of the Diet.[213][214] The League of Nations ended its efforts to mediate the dispute. After Lithuanians seized theKlaipėda Region in January 1923, the League saw recognition of Lithuanian interest in Klaipėda as adequate compensation for the loss of Vilnius.[215] The League accepted thestatus quo in February 1923 by dividing the neutral zone and setting a demarcation line, which was recognised in March 1923 as the official Polish–Lithuanian border.[215] Lithuania did not recognize this border.[215]
Some historians, notablyAlfred E. Senn, have asserted that if Poland had not prevailed in the Polish–Soviet War, Lithuania would have been invaded by the Soviets and would never have experienced two decades of independence.[216] Despite theSoviet–Lithuanian Peace Treaty of 1920, Lithuania was very close to being invaded by the Soviets in the summer of 1920 and being forcibly incorporated into that state, and only the Polish victory derailed that plan.[216]
The dispute over Vilnius remained one of the biggest foreign policy issues in Lithuania and Poland. Lithuania broke off all diplomatic relations with Poland and refused any actions that would recognize Poland's control of Vilnius evende facto.[217] For example, Lithuania broke off diplomatic relations with theHoly See after theConcordat of 1925 established an ecclesiastical province in Wilno and thereby acknowledged Poland's claims to the city.[218] Poland refused to formally recognize the existence of any dispute regarding the region since that would have lent legitimacy to the Lithuanian claims.[219] Railroad traffic and telegraph lines could not cross the border, and mail service was complicated. For example, a letter from Poland to Lithuania needed to be sent to a neutral country and repackaged in a new envelope to remove any Polish signs and only then could be delivered to Lithuania.[220] Despite several attempts to normalize the relations, the situation of "no war, no peace", lasted until Poland demanded to re-establish diplomatic relations by issuing theultimatum of 1938.[215] These tensions were one of the reasons that Józef Piłsudski'sMiędzymorze federation was never formed.[181] The Soviets gave Vilnius to Lithuania after theSoviet invasion of Poland in September 1939.[221]
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