 On 3 September 1939 units from the Wehrmacht entered the town after the Battle of Grudziądz and occupied it.From 26 October 1939 to 1945 Graudenz was part of the administrative district of Regierungsbezirk Marienwerder in the new province of Reichsgau Danzig-West Prussia.Graudenz was the location of the German concentration camp Graudenz, a subcamp of Stutthof concentration camp.