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.