In 1940, one roundup was used by Home Army secret agent Witold Pilecki to gain entry into the Auschwitz camp set up at about that time for Polish prisoners. There, he gathered first-hand intelligence on the camp, and organised inmate resistance. Pilecki deliberately went out into the street during a Warsaw roundup on 19 September 1940, and was arrested by the Nazis along with other civilians. Auschwitz was the main destination for the Poles from beyond the ghetto. There he organised "Związek Organizacji Wojskowej" ("ZOW", the Military Organization Association), and in November 1940 sent its first report about the camp and the genocide being committed there to Home Army headquarters in Warsaw.