Before he took over the Abwehr on 1 January 1935, the soon-to-be Admiral Canaris was warned by Patzig of attempts by Himmler and Reinhard Heydrich to take over all German intelligence organizations.[15] Heydrich, who headed the Sicherheitsdienst (SD) from 1931, had a negative attitude towards the Abwehr—shaped in part by his belief that Germany's defeat in the First World War was primarily attributable to failures of military intelligence,[lower-alpha 7] and by his ambitions to control all political intelligence-gathering for Germany.[17]