Mass arrests of priests , teachers , intelligentsia and fighters of three anti-German , Silesian Uprisings ( 1919 -- 1921 ) took place .
At the onset of World War II in 1939 , Polish independence came to an end and Nazi German occupation began .
Mass arrests of priests , teachers , intelligentsia and fighters of three German , Silesian Uprisings ( 1919 -- 1921 ) took place .
At the onset of World War II in 1939 , Polish independence came to an end and Nazi German occupation began .