The Battle of Bereza Kartuska was fought between the Second Polish Republic and Soviet Russia around the village Bereza Kartuska (now Byaroza, Belarus) first on 14 February 1919, and again between 21 and 26 July 1920. Polish units crossed the border, invading Belarus. They attacked the township of Bereza and crossed the Neman River, taking Pinsk and reaching the outskirts of Lida. The first skirmish of Bereza is considered to be the initial engagement of the Polish–Soviet War of 1919–1921 by some historians.