Prisons like Tuol Sleng were created to cleanse the population of suspected enemies of the revolution. In Tuol Sleng, Duch ordered the execution of prisoners after their interrogation was completed. For example, on a list containing the names of 17 prisoners (eight teenagers and nine children), he wrote the order "Smash them to pieces." On a longer list of detainees, his annotation reads "smash: 115; keep: 44 persons." The text below this annotation reads "Comrade Duch proposed to Angkar; Angkar agreed." On a list of 20 female detainees, Duch wrote annotations for each of them, ordering: "take away for execution," "keep for interrogation" or "medical experiment". At least 100 detainees died after having all of their blood drawn for transfusions for wounded soldiers. Surgical operations were also performed on detainees in order to train medical staff.