witold pilecki (13 may 1901 – 25 may 1948) was a polish resistance leader against nazi germany during world war ii. he was also a spy, and cavalry officer. he was a captain in the polish army during world war ii and the polish-soviet war. he was also one of the creators of the secret polish army, which was a resistance group in german-occupied poland. he was the writer of witold's report, the first spy report on auschwitz, a german concentration camp, and the holocaust. his religion was roman catholic, a christian group.