So, still not happy, they then started doing small scale trials of what would go on to become the large scale, infamous, death camp gas chambers. These trials were successful and showed them that this method was 'the one' as it facilitated the means to kill the largest number of prisoners, without 'excessive' initial panic. So by September 1941, when they were conducting the first trials of this method at Auschwitz, Sachsenhausen had already been the scene of "some gassings in conjunction with the development of gas vans" [3]