 One example was a reprisal action by units of the 19th Panzer Corps Division taken for the operations of the Suwalska Cavalry Brigade of the Polish Army.During the evening of 13 September 1939 thirteen people from Olszewo and ten people from the nearby village of Pietkowo were killed.The victims among the villagers include women and children who were murdered in several ways, such as stabbing by bayonets, shooting, being blown apart by grenades, and being burned alive in a barn.