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During the Polish Defensive War of 1939 the town was the scene of heavy fighting between the Polish 60th Infantry Division of Colonel Adam Epler and the German XIX Panzer Corps of General Heinz Guderian.
In reprisal for the operations of the Suwalska Cavalry Brigade, during the evening of 13 September 1939 units of the German XIX Panzer Corps, under the command of General Heinz Guderian, murdered thirteen people (half of the villagers) from Olszewo and ten people from the nearby village of Pietkowo.