Concept

Polish–Soviet War

Summary
The Polish–Soviet War (late autumn 1918 / 14 February 1919 – 18 March 1921) was fought primarily between the Second Polish Republic and the Russian Soviet Federative Socialist Republic in the aftermath of World War I and the Russian Revolution, on territories which were formerly held by the Russian Empire and the Austro-Hungarian Empire. On 13 November 1918, after the collapse of the Central Powers and the Armistice of 11 November 1918, Vladimir Lenin's Russia annulled the Treaty of Brest-Litovsk (which it had signed with the Central Powers in March 1918) and started moving forces in the western direction to recover and secure the Ober Ost regions vacated by the German forces that the Russian state had lost under the treaty. Lenin saw the newly independent Poland (formed in October–November 1918) as the bridge which his Red Army would have to cross to assist other communist movements and to bring about more European revolutions. At the same time, leading Polish politicians of different orientations pursued the general expectation of restoring the country's pre-1772 borders. Motivated by this idea, Polish Chief of State Józef Piłsudski (in office from 14 November 1918) began moving troops east. In 1919, while the Soviet Red Army was still preoccupied with the Russian Civil War of 1917–1922, the Polish Army moved into territories regarded by many Poles as Polish "Kresy". That year, they took most of present-day Lithuania and Belarus. By July 1919, Polish forces had taken control of much of Eastern Galicia and had emerged victorious from the Polish–Ukrainian War of November 1918 to July 1919. In the eastern part of Ukraine bordering on Russia, Symon Petliura tried to defend the Ukrainian People's Republic, but as the Bolsheviks gained the upper hand in the Russian Civil War, they advanced westward towards the disputed Ukrainian lands and made Petliura's forces retreat. Reduced to a small amount of territory in the west, Petliura was compelled to seek an alliance with Piłsudski, officially concluded in April 1920.
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