PL
The article is an element of ordering knowledge of the armed under-ground existing and operating in Poland in 1944–1948. It includes the genesis of the uprising, as well as an outline of the history of the Polish Underground State and the Polish Army in the USSR, which was com-manded by Gen. Władysław Anders. It also contains a condensed de-scription of the post-war underground operation in Poland and its divi-sions. It presents the causes of individual events that affected the devel-opment or abandonment of political and armed underground activities, as well as crimes and crimes committed at that time by both opposing parties (armed forces and state security forces).