After the Armistice of 11 November 1918, Höss completed his secondary education and soon joined some of the emerging nationalist paramilitary groups, first the East Prussian Volunteer Corps, and then the Free Corps "Rossbach" in the Baltic area, Silesia and the Ruhr. Höss participated in the armed terror attacks on Polish people during the Silesian uprisings against the Germans, and on French nationals during the Occupation of the Ruhr. He joined the Nazi Party in 1922 (member n. 3240) after hearing a speech by Adolf Hitler in Munich.