Canaris began working more actively to overthrow Hitler's régime, although he also cooperated with the SD to create a decoy. This made it possible for him to pose as a trusted man for some time. He was promoted to the rank of full Admiral in January 1940. With his subordinate Erwin Lahousen, he attempted in the autumn of 1940 to form a circle of like-minded Wehrmacht officers. At the time, this had little success. When the OKW decrees regarding the brutal treatment of Soviet prisoners of war related to the Commissar Order came to the attention of Canaris in mid-September 1941, he registered another complaint. Keitel reminded Canaris that he was thinking in terms of "chivalrous war", which did not apply, as this was "a matter of destroying a world ideology". Meanwhile, the complaints and Canaris' apparent squeamishness were noted by Heydrich and added to his file on the "political unreliability" of the "Abwehr". Canaris also worked to thwart the proposed Operation Felix, the German plan to seize Gibraltar.