the Marxist theoretician and revolutionary, Róża Luksemburg; the future Marshal of Poland, Józef Piłsudski; Piłsudski's political archrival, Roman Dmowski; and Eligiusz Niewiadomski, assassin of Poland's first president, Gabriel Narutowicz. The Citadel's Tenth Pavilion has, since 1963, served as a museum. Well before the turn of the 20th century, it was apparent that such traditional fortifications had been made obsolete by modern rifled artillery. The Tsarist authorities had planned in 1913 to raze the fortress, but the process had not begun before the outbreak of World War I. In 1915 Warsaw was occupied by German forces with little opposition from the Russian garrison, which abandoned the fortress and withdrew east. The Germans blew up several of its structures, but the main part of the Citadel remained intact and German forces performed a mass execution of 42 people in 1916. After Poland regained her independence in 1918, the Citadel was taken over by the Polish Army. It was used as a garrison, infantry training center, and depot for materiel. During the 1944 Warsaw Uprising, Citadel's German garrison prevented linking between the city center and the northern Żoliborz district. The fortress survived the war and in 1945 became again Polish Army property. See also Warsaw Fortress Festung Warschau References "Cytadela warszawska," Encyklopedia Polski, p. 109. Citadel Warsaw Governorate Museums in Warsaw Military and war museums in Poland Żoliborz 1834 establishments in the Russian Empire