 Complete the following phrase:  Reportedly, Schellenberg and Wilhelm Canaris, the head of the Abwehr, were friends. They would go horseback-riding together in Berlins wooded Grunewald, where they discussed the future of Nazi Germany. Often present at these equestrian outings were Heydrich and Werner Best. Their alleged friendship aside, Canaris was careful around Schellenberg, a man whose ambitions included controlling all intelligence for the Reich. Like Heydrich, Schellenberg ultimately envisioned a centrally directed all-embracing security system and a singular Greater German Intelligence Service under direct Nazi control unlike the Abwehr, which was part of the Wehrmacht. Nonetheless, there are indications that Schellenberg preferred to deal with Canaris Abwehr over the Gestapo, particularly since he distrusted its chief, Heinrich Müller. However, after the 