Secret Polish Army

Secret Polish Army was a Polish resistance movement founded in November 1939 in German-occupied Poland, which was active in the voivodeships of Warsaw, Podlasie, Kielce and Lublin.
Founders were:

Lieutenant Colonel Jan Henryk Włodarkiewicz "Darwicz" – Chief of the Staff
Cavalry Lieutenant Witold Pilecki "Witold"
Lieutenant Colonel "Stefan"

In 1940, it and several other underground organizations merged into the Confederation of the Nation. In 1943, the latter became part of the Polish Home Army.