Analysis of information sources in references of the Wikipedia article "September 19" in English language version.
{{cite web}}: CS1 maint: numeric names: authors list (link)Pilecki was eventually cleared to insert himself into a street round-up of Poles in Warsaw on Sept. 19, 1940. Upon arrival, he learned Auschwitz was far from anything the Resistance had imagined.
Witold Pilecki, a Polish cavalry officer turned resistance fighter, undertook the most audacious of missions: to get himself arrested by the Germans and sent to the Nazi concentration camp at Auschwitz. On September 19, 1940, he went out during a Warsaw street round up and was arrested. He was also successful in the mission that followed: to sabotage the camp and smuggle news to the world through Polish resistance networks of the atrocities occurring within. Only the world wasn't ready to listen.