Polish–Soviet War
conflict between Poland and Soviet Russia following the First World War (February 1919 - March 1921)
The Polish–Soviet War (14 February 1919 – 18 March 1921) was fought primarily between the Second Polish Republic and the Russian Soviet Federative Socialist Republic, following World War I and the Russian Revolution.
After the collapse of the Central Powers and the Armistice of 11 November 1918, Vladimir Lenin's Soviet Russia annulled the Treaty of Brest-Litovsk and moved forces westward to reclaim the Ober Ost regions abandoned by the Germans. Lenin viewed the newly independent Poland as a critical route for spreading communist revolutions into Europe. Meanwhile, Polish leaders, including Józef Piłsudski, aimed to restore Poland's pre-1772 borders and secure the country's position in the region. Throughout 1919, Polish forces occupied much of present-day Lithuania and Belarus, emerging victorious in the Polish–Ukrainian War. However, Soviet forces regained strength after their victories in the Russian Civil War, and Symon Petliura, leader of the Ukrainian People's Republic, was forced to ally with Piłsudski in 1920 to resist the advancing Bolsheviks.
In April 1920, Piłsudski launched the Kiev offensive with the goal of securing favorable borders for Poland. On 7 May, Polish and allied Ukrainian forces captured Kiev, though Soviet armies in the area were not decisively defeated. The offensive lacked local support, and many Ukrainians joined the Red Army rather than Petliura's forces. In response, the Soviet Red Army launched a successful counteroffensive starting in June 1920.
This brief starts where responsible research should: with the source description of “Polish–Soviet War” as conflict between Poland and Soviet Russia following the First World War (February 1919 - March 1921). Everything that follows is an evidence route, not borrowed authority.
Why this record matters
The subject matters to the history & society register because the source frames it as conflict between Poland and Soviet Russia following the First World War (February 1919 - March 1921). Its deeper value depends on whether names, dates, institutions and citations support that framing.
Contemporary correspondence, administrative files and participant testimony can test how later narratives organized the event or institution. The source revision retrieved here is dated Aug 22, 2026. The linked authority identifier is Q186284. The Library of Congress control number is sh85116054. 1 of 1 selected statements include explicit references; 0 carry qualifiers and 0 use preferred rank. The first chronological checks are 1919, 1921, 1918 and 1772.
Later summaries often reconcile disputed chronology or motive more neatly than the contemporary record permits. The source lead contains qualifying language; that uncertainty should survive quotation, summary and reuse. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
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This entry incorporates text from “Polish–Soviet War” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.