In the beginning of the 20th century, the source of the silver ore dried out and the mining stopped completely. After World War I ended, between 1919 and 1921 three massive anti-German uprisings took place in entire Upper Silesian region and many of towns residents fought and supported the cause. Soon after the end of the third one, mandated by the Versailles Treaty, the Silesian Plebiscite was held, and an overwhelming majority of the Upper Silesia region voted for integration with newly independent Poland; in Tarnowskie Góry however, 82% of the participants favored Germany in large part due to "imported" votes. In 1922, after over 300 years of Austrian and Prussian domination, Tarnowskie Góry was returned to Poland. In the interwar period the 11th Infantry Regiment of the Polish Army was stationed in Tarnowskie Góry.