Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Jan Piwnik (1912 1944) was a Polish World War II soldier, a cichociemny and a notable leader of the Home Army in the wi tokrzyskie Mountains. He used the noms de guerre Ponury ("Gloomy" or "Grim") and Donat.Jan Piwnik was born August 12, 1912 in the village of Janowice near Ostrowiec wi tokrzyski. In 1933, he graduated from a reserve NCO artillery school in W odzimierz Wo y ski. In 1935, he joined the Polish police, where he served as an officer.