Polish prisoners and internees in Soviet Russia and Lithuania (1919–1921)

Polish prisoners of war and internees in Soviet Russia and Lithuania — Polish soldiers and citizens who were captured and interned during the Polish–Soviet War and remained in the custody of Soviet and Lithuanian authorities. Their condition is one of the less researched controversies of that period.

Source: Wikipedia — Polish prisoners and internees in Soviet Russia and Lithuania (1919–1921) (CC BY-SA 4.0)