After the battle was over, Szwedowski was arrested and sent to the camp Stutthof. At first it was thought that he perished in this camp, but there is evidence to the contrary in the form of a death certificate issued on the basis of the record books for the day of August 30, 1941 in the General Governorship in Legionowo (document number 105 of the year 1941). The death certificate states that Karol Szwedowski, son of Jacenty (father) and Jozefa (mother), died in Legionowo at Bukowiec on August 30, 1941, at the age of 52.