The Soviet-Polish War

Borderlands Without Borders: How the War Began

The war was never declared, and even its starting date is hard to fix. Germany's surrender in November 1918 left a vast vacuum in the middle of Eastern Europe, where three empires had ruled. No treaty defined the eastern border of reborn Poland, and Soviet Russia was pushing troops westward on the heels of the withdrawing Germans. In February 1919 the two armies, advancing toward each other, first collided at Bereza Kartuska in Belorussia.

The two states' aims were incompatible from the start. Pilsudski, Poland's head of state, wanted a Polish-led federation of Lithuania, Belorussia and Ukraine standing between Poland and Russia, pushing Russia back to its pre-eighteenth-century bounds. For the Soviet leadership Poland was less a goal than a bridge to revolutionary Germany. In 1919 Polish forces took Wilno (April) and Minsk (August); but in the autumn Pilsudski halted and, through secret contacts, in effect froze the front. This was precisely the moment Denikin's Whites were approaching Moscow. A victory of the Whites, whose slogan was 'Russia one and indivisible,' would be worse for Polish independence than the Soviet government, he calculated, and the calculation gave the Soviet regime breathing space at the peak of the White advance.

Poland advanced into the space left by collapsing German occupation. That background continues in Brest-Litovsk; the Rada, Hetmanate, Directory and Petliura's declining bargaining position in Ukraine's revolution and wars.

1919: from Vilnius to Mikaszewicze

The first year's war was small, but its consequences were large. In the spring of 1919 the Polish army was still a sum of several armies: Polish officers of the old Austrian and German armies, Piłsudski's legionaries, Józef Haller's "Blue Army" of some 68,000 men organized in France and shipped in from April, and the Greater Poland army that had risen against Germany at Poznań, all being welded into one force while still wearing different uniforms and answering to different chains of command. On the Soviet side the western frontier was held by the Western Army that had followed the Germans in, always short of troops because of the southern and eastern fronts against Denikin and Kolchak.

From 19 to 21 April Piłsudski personally led cavalry in a surprise attack on Vilnius and drove out the Litbel Soviet government. In his proclamation of 22 April "to the inhabitants of the former Grand Duchy of Lithuania" he promised to let them decide their own future, but the city stayed in Polish hands. Minsk fell on 8 August, and in the autumn the front came to rest on the Berezina and the Daugava. Piłsudski stopped not because his strength was spent. That autumn Denikin, marching on Moscow, asked Poland for joint operations but refused to discuss Poland's eastern frontier except on the premise of restoring "Russia one and indivisible". Piłsudski judged that a White victory would return Poland to the borders of 1914. From October to December secret talks were held at Mikaszewicze station in Belorussia between the Polish envoy Boerner and the Soviet envoy Julian Marchlewski, and as a result the Polish army stood still during the decisive weeks in which Denikin broke at Orel. The Soviet leadership could shift some 40,000 men from the west to the south. Denikin later counted this silence among the causes of his defeat.

The truce of Mikaszewicze was not a peace. On 28 January 1920 the Soviet government offered Poland peace "on the present front line", and the Polish government put off its answer. Meanwhile on 3 January Polish troops took Daugavpils together with Latvia, and Piłsudski prepared for a decision in the spring. The Soviet side reckoned the same way. In March 1920, with Kolchak shot and Denikin embarking at Novorossiysk, the Red Army's best formations began to move west. Each country believed the other was preparing to attack, and both were right.

The northern flank: cooperation with Latvia, conflict with Lithuania

In January 1920 Polish and Latvian forces drove Soviet troops from Daugavpils in a joint operation. Latvia sought control of Latgale; Poland secured contact with a friendly state and reduced its northern commitments. Lithuania shows why this was not a common Polish-Baltic war.

Poland had occupied Vilnius in April 1919. Soviet Russia recognized Lithuania's claim to the city in the Moscow treaty of 12 July 1920, without settling the dispute with Poland. Red advances and retreats brought renewed Polish-Lithuanian clashes. The Suwałki Agreement of 7 October provided a limited demarcation and ceasefire; Żeligowski's troops seized Vilnius on 9 October. Central Lithuania left a legacy of enduring hostility. The independence struggles and separate peace settlements are covered in the Baltic wars of independence.

Spring 1920: Poland Goes to Kiev

In early 1920 both sides exchanged peace proposals while preparing for a decisive campaign. On 21 April Pilsudski concluded the Warsaw agreement with Petliura, the exiled head of the Ukrainian People's Republic: Poland recognized his government, and Petliura conceded Eastern Galicia and western Volhynia to Poland. The joint offensive opened on 25 April, and on 7 May Polish troops entered Kiev, which the Red Army had abandoned rather than defend.

The military success was politically hollow. Even in Petliura's name no mass rising of the Ukrainian peasantry occurred, and the surrender of Galicia undercut his standing within the Ukrainian national movement. On the Soviet side, by contrast, the 'invasion of the Polish lords' became an occasion for patriotic mobilization that rebound a society exhausted by civil war: thousands of former tsarist officers, Brusilov among them, volunteered to serve the Red Army in this war.

To the Vistula: Revolution on Bayonets

The counterblow came on two axes. In the south, on 5 June, Budyonny's 1st Cavalry Army tore open the front and drove the Poles from Kiev; in the north, on 4 July, Tukhachevsky's Western Front went over to a general offensive. In the course of July, Minsk, Wilno, Grodno and Bialystok fell in turn. On 11 July Britain proposed an armistice on the ethnographic line later known as the Curzon Line; confident of victory, the Soviet government declined mediation.

At this point the character of the war changed: a defensive war became a test of exporting revolution. The delegates of the Second Comintern Congress, then meeting in Moscow, followed the front's movement on a map hung in the hall. On 30 July, in occupied Bialystok, the Provisional Polish Revolutionary Committee (Polrevkom) of Marchlewski, Dzerzhinsky, Kon and others was proclaimed as a government-in-waiting for a Soviet Poland. The expectation failed. Polish workers and peasants met the Red Army not as liberators but as a Russian army. Lenin later admitted to Clara Zetkin that they had faced the Red Army 'as enemies, not the allies we had counted on,' and in a closed speech to the party conference in September 1920 he called the march on Poland 'a reconnaissance by bayonet' and conceded the defeat. That speech was published only in 1992.

A Revolutionary Government and a Divided Command: Two Cracks on the Road to Warsaw

Arriving in Białystok, the Polrevkom declared in its manifesto that it was "depriving the gentry-bourgeois government of power" and proclaimed factories, forests, and landed estates the property of the people. Headed by Julian Marchlewski, with Feliks Dzerzhinsky as its de facto leader and Feliks Kon and Iosif Unshlikht among its members, this government-in-waiting had travelled by armoured train from Smolensk via Minsk and Wilno in the wake of Tukhachevsky's advancing armies. His troops had taken Białystok on 28 July, two days before the committee's proclamation; the Polrevkom set up headquarters in the Branicki Palace.

But the expected rising of Polish workers never came. On 5 August Dzerzhinsky cabled Lenin: "The mood beyond the Narew is hostile; they drive off their cattle and horses, they strip the wheels from the carts." The Polish Red Army the committee tried to raise amounted to barely 176 men in a single Red Rifle Regiment, supplemented by detachments from the Russian Red Army, perhaps a thousand in total. Among Białystok's Jewish working class the reception was relatively warm, but the Catholic Polish majority regarded the committee as little more than an occupier's puppet. On 4 August the Polrevkom ordered the arrest and dispatch to concentration camps of "all those dangerous to the socialist revolution in Poland, all representatives of the Polish big bourgeoisie and landowners, and all known for their sympathy with White Poland," yet its real administrative reach extended over only a sliver of occupied territory.

At this very moment a second crack was opening inside the Red Army's own command, one that would undo the whole advance. Tukhachevsky's Western Front had covered over 600 kilometres in July and now stood east and north of Warsaw, but its southern flank was perilously exposed, held only by the Pripet Marshes and the 8,000-strong Mozyr Group. The seam between Tukhachevsky's forces and Yegorov's South-Western Front was the most vulnerable point on the entire line.

At Tukhachevsky's insistent urging, Commander-in-Chief Sergey Kamenev issued a directive on 2 August transferring the 12th Army and Budyonny's 1st Cavalry Army from the South-Western Front to the Western Front; he reaffirmed the order on 5 August. But Stalin, the political commissar of the South-Western Front's Revolutionary Military Council, refused to countersign. For Stalin, Lwów was more than a military objective. Taking it would make his front the war's decisive victor while insulating him from the charge of abandoning the southern theatre, where Wrangel's White forces were pressing from the Crimea. On 12 August he wrote to Lenin arguing that "the commander-in-chief and his boys are sabotaging the work of organizing victory over Wrangel."

The 1st Cavalry Army remained tied down in the battle for Lwów throughout August; not a single division of it reached Warsaw. Karl Radek had warned of an explosive Polish nationalist resistance, and Trotsky too was sceptical of the march on Warsaw. But Lenin, convinced that Poland was the bridge to European revolution, ordered the advance to continue. On 13 August Tukhachevsky's forces opened the battle by attacking Radzymin east of the capital, but by then the two cracks, a divided command and a hostile Polish population, had already set the terms of the coming defeat.

Warsaw: the battles of August

On 24 July a government of national defence was formed in Warsaw with the peasant leader Wincenty Witos as prime minister and the socialist Ignacy Daszyński as his deputy. This government of left and right together appealed for volunteers, and by mid-August more than 100,000 had enlisted. The minister of military affairs, Kazimierz Sosnkowski, ran the mobilization of the rear, and the chief of staff, Tadeusz Rozwadowski, fixed the counterattack plan in operational order 8358/III of 6 August. In the north Sikorski's 5th Army would hold the Soviet 4th and 15th Armies on the Wkra; the 1st Army in front of Warsaw would hold Radzymin; and a strike group of five divisions assembled on the Wieprz in the south would drive north into the exposed left flank of the Soviet 16th Army. On 12 August Piłsudski briefly laid down the office of head of state and took personal command of the strike group.

Poland's greatest weapon was out of sight. Jan Kowalewski of the general staff's cipher bureau had been breaking the Red Army's radio ciphers since September 1919, and during the August battles the Polish command read Tukhachevsky's orders almost in real time. On 13 August the Soviet 3rd and 16th Armies attacked Radzymin, 20 kilometres east of Warsaw, taking and losing the town twice. On 14 August the priest Ignacy Skorupka, leading a volunteer battalion at Ossów, was killed, and his death soon became the central symbol of the "Miracle on the Vistula". The same day Sikorski's 5th Army counterattacked on the Wkra in the north, and on 15 August Polish cavalry raided Ciechanów, where the Soviet 4th Army's radio station stood, cutting Tukhachevsky's link to that army. For the next several days the 4th Army kept marching west without orders from headquarters.

At dawn on 16 August the strike group on the Wieprz moved north. The expected resistance was not there. The 100-kilometre gap held by the 8,000 men of the Mozyr Group opened within a day; on 17 August Polish troops took Siedlce and Mińsk Mazowiecki and on the 18th cut the railway to Białystok. Tukhachevsky, at his headquarters in Minsk, grasped the situation only on 18 August and ordered a general retreat. The 4th Army and Gaya Gai's 3rd Cavalry Corps, which had advanced furthest north of Warsaw, found their way back blocked and crossed into East Prussia between 24 and 26 August, where German troops disarmed them. When the battle ended on 25 August the Red Army had lost 66,000 men taken prisoner and more than 40,000 interned, along with more than 200 guns and 1,000 machine guns; Poland lost about 4,500 killed and 22,000 wounded.

In the south another battle followed. Budyonny's First Cavalry Army, having given up Lwów and turned north-west on 20 August, attacked Zamość from 29 to 31 August. The town was held by Polish units and the 6th Division of the Ukrainian People's Republic under Marko Bezruchko. On 31 August at Komarów Rómmel's Polish 1st Cavalry Division met the First Cavalry Army head-on, in what is called the largest cavalry battle in Europe since 1813, and Budyonny's army suffered its first decisive defeat, falling back beyond the Bug. The Poles had been reading Soviet dispositions through radio interception and code-breaking, the supply lines were stretched to breaking, and coordination with the South-Western Front had collapsed. The refusal of its political commissar, Stalin, to countersign the order transferring the Cavalry Army became the core of the later controversy over blame, and the feud between Tukhachevsky and the Stalin-Budyonny camp ran on to 1937.

French arms, ammunition, military training and attached advisers provided sustained support. The French Military Mission active from 1919 should be distinguished from the Anglo-French Interallied Mission of summer 1920. Maxime Weygand, part of the latter, advised the Polish staff and discussed the counterattack. Attributing victory to him alone would erase the planning and execution by Piłsudski, Rozwadowski and the Polish command. Conversely, the Polish "miracle" narrative erases the worldly conditions of the division in the Soviet command, the coolness of Polish workers and the broken ciphers.

Workers' strikes and the choices of the powers: the war's international context

This war was also the first occasion on which Europe's labour movement directly blocked its own governments' foreign policy. In May 1920 dockers in the port of London refused to load the freighter Jolly George, which carried arms for Poland. On 9 August, as the Red Army approached Warsaw and the British government considered intervention, the Labour Party and the Trades Union Congress set up a "Council of Action" and declared that a war on Soviet Russia would be met with a general strike; some 350 local councils of action sprang up across the country. Lloyd George's government gave up the idea of sending troops. Germany declared neutrality on 20 July and closed its territory to transit, and in August the dockers of Danzig refused to unload munitions for Poland, so that British soldiers had to do the unloading themselves. Czechoslovakia also banned the transit of arms, and the troops offered by Horthy's Hungary were stopped by that ban. Poland fought all but isolated from the west.

The exception was France. France had kept a military mission training the Polish army since 1919, and in 1920 it sent hundreds of thousands of rifles, thousands of machine guns, hundreds of guns, aircraft and tanks. The Kościuszko Squadron, flown by American pilots, attacked Budyonny's cavalry from the air. Nor was Allied policy of one piece. At the Spa conference on 10 July Britain promised the Polish prime minister Grabski mediation on condition that Poland withdraw to the Curzon line and hand Vilnius to Lithuania, and on 11 July the Curzon note went to Moscow; the Soviet government, sure of victory, refused it. France saw Poland as a barrier between Germany and the Soviets; Britain wanted trade with Russia reopened. The victory of August freed Poland from the conditions of either.

On the Soviet side the war was the Comintern's first field test. The delegates to the Second Congress of the Comintern, meeting in Moscow from 19 July to 7 August, followed the movement of the front on a map hung in the hall. The "Twenty-One Conditions" the congress adopted and its theses on the national and colonial question rested on the premise that Europe's revolution was imminent. The fact that Polish workers did not greet the Red Army as liberators shook that premise. Karl Radek and the Polish communists had warned of the force of Polish nationalism before the advance, and Lenin later admitted that the war had been "a reconnaissance by bayonet". The idea of hastening Europe's revolution by military means ended before Warsaw, and trade agreements, the Rapallo treaty and the New Economic Policy took its place.

From the Niemen to Riga: How the Defeated Side Got the Better Peace

After Warsaw, Tukhachevsky's Western Front fell back and by mid-September had established a new defensive line along the Niemen, Shchara, and Svislach rivers. Commander-in-Chief Sergey Kamenev ordered a counter-offensive, but the reality on the ground told a different story. The Western Front's units stood at 20 to 40 percent of their nominal strength; 68,000 reinforcements arrived in August and another 20,500 in September, yet experienced officers and artillery had been largely spent before Warsaw. Still, Tukhachevsky regrouped his 3rd, 15th, and 16th Armies and planned a southward drive to retake Brest Fortress and Białystok.

Pilsudski moved first, determined to break the Niemen line before Soviet defences hardened. The key to his plan was an outflanking manoeuvre. While the Polish 2nd and 4th Armies pinned the Soviets frontally at Grodno and Wołkowysk, General Osiński's Suwałki Group would slip through a narrow corridor between Sejny and Druskienniki, a strip of territory then held by Lithuania, and strike the rear of the Soviet 3rd Army from the north. The battle opened on 20 September when the Polish 21st Alpine Division attacked Grodno. After three days of stalemate, the Poles took Druskienniki on 23 September and cut the railway linking Grodno and Wilno. The Soviet 3rd Army's supply line was severed; Polish cavalry reached as far as Lida. On 26 September, General Krajowski's horsemen took Pinsk, threatening the Soviet 4th Army's supply line as well. Tukhachevsky had no choice but to order a general retreat. After the Battle of the Szczara River in mid-October, the front had been pushed back to the line of Tarnopol, Dubno, Minsk, and Drissa.

But the Polish army was itself utterly spent. Though Poland had mobilised nearly a million men, only some 350,000 were on the eastern front, and most units stood at 50 to 60 percent of their nominal complement. And Pilsudski faced a deeper problem: the political goal of the war, an independent Ukraine allied with Poland, was already lost. Victory at Warsaw had saved Poland, not restored Petliura.

This is why the negotiating table produced an unexpected picture. Peace talks had opened at Minsk on 17 August, even as the Battle of Warsaw was raging, and were moved to Riga, resuming on 21 September. The Soviet delegation was now led by Adolph Joffe, who brought an offer drafted in Moscow: the border would run 'considerably to the east' of the Curzon Line, Eastern Galicia would remain on the Polish side, and the question of national self-determination would be set aside. The offer was valid until 5 October. Soviet Russia had compelling reasons for such concessions. Wrangel's White army still held out in the Crimea, and peasant uprisings, above all the Tambov Rebellion, were spreading across the Russian interior. Lenin could not afford to prolong the Polish front. On 15 October, speaking to a conference of Moscow gubernia committee chairmen, he put it plainly: 'We signed the preliminary peace on terms more favourable than those we proposed in April. Then the border was 50 versts further east; now it is 50 versts further west.'

The more dramatic reversal, however, came from the Polish side. Poland had won the war but did not press for maximal territorial gains. Jan Dąbski, who headed the Polish delegation at Riga, was not a Pilsudski man. The delegation was dominated by the National Democrats (Endecja), and their ideological leader, Stanisław Grabski, argued that incorporating broad eastern territories with Minsk would swell the non-Polish minority beyond a third of the population: a threat to the stability of a Polish nation-state and, not incidentally, an electoral gift to Pilsudski's camp. In confidential one-on-one talks with Joffe, Dąbski traded away Minsk in return for the strategic railway linking Baranowicze, Łuniniec, Sarny, and Równe and a corridor connecting Poland with friendly Latvia. Agreement was reached on 5 October; the Preliminary Peace Treaty and Armistice was signed on 12 October and came into force at midnight on 18 October. Petliura's Ukrainian People's Republic, the very ally for whom the war had been taken to Kiev, was now stripped of Polish recognition and left alone to face the Soviet armies. Pilsudski called the treaty 'an act of cowardice' and, the following May, visited the Ukrainian internment camp at Kalisz to apologise to Petliura's soldiers. Poland had won the war, yet the victors themselves narrowed the peace.

Riga's border and the allies excluded from peace

The Treaty of Riga of 18 March 1921 was signed by Poland, Soviet Russia and Soviet Ukraine, with Soviet Russia also representing Soviet Belarus. Poland obtained extensive eastern territories, but Minsk remained Soviet. This was distinct from the Latvian-Russian treaty signed at Riga in August 1920.

Polish leaders did not share a single objective. Piłsudski's federation project and alliance with Petliura sought an independent Ukraine between Poland and Soviet Russia. National Democrats prioritized the territory and population a Polish nation-state could govern. Soviet leaders needed to reduce western commitments while confronting Wrangel and peasant rebellion. Exhaustion and conflicting state projects converted military victory into a limited settlement.

The Ukrainian People's Republic paid the most direct price among Poland's allies. Petliura was excluded from negotiations as Poland recognized Soviet Ukraine as its treaty partner. Republican troops fought on until November 1920, then retreated into Polish internment. Bułak-Bałachowicz's separate expedition into Belarus also failed after the armistice. Continued fighting by anti-Soviet forces beyond the settlement did not commit Warsaw to renewed general war.

The treaty provided for nationality options, minority language, religious and cultural rights, restitution of property and cultural objects, and financial settlement. Implementation differed from the promises. Ukrainians and Belarusians were divided by the border; Jews and other communities also inhabited Poland's east. State consolidation meant both an achievement of stability and continued conflict over minority rule.

Prisoner deaths were not resolved by drawing a border. Epidemics, hunger, camp conditions and responsibility must be examined through prisoner records. Using them to justify the later Katyn massacre by exchanging casualty totals distorts distinct events. Warsaw checked hopes of extending European revolution through the Red Army, but neither the New Economic Policy nor the turn towards relations with the West can be explained by this war alone. Postwar state-building continues in the Russian Civil War and the formation of the USSR.