Britain's experience of being bombed in the Blitz had contributed to the RAF's thinking on how to conduct a bombing campaign. It had become clear that incendiaries could inflict much more damage than high explosive bombs. Detailed study of this was carried out by the Research and Experiment unit, RE8, (set up in November 1941). The details of how German houses were constructed were examined and tests were carried out on models to determine how effective an incendiary attack would be. The precise ratio of high explosive bombs and incendiaries was calculated. The high explosive was to blow out windows and make fire fighting dangerous. High explosive bombs with delayed action fuses were included in the mix to further suppress any fire fighting effort. The quantity of incendiaries delivered had to be high enough to totally overwhelm any fire fighting capability, so that a conflagration could become established.