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The Battle of Ossów took place in the fields near Wołomin on 14 August 1920. It was a part of a much larger battle on the outskirts of Warsaw during the Polish-Bolshevist War (February 1919 - March 1921). During the day Soviet units managed to capture the strategically important village of Ossów, but were repelled in the evening by a Polish counter-attack. The battle was one of the first skirmishes won by the Poles since the beginning of the Soviet offensive in late spring.