A month later, Canaris and the "Abwehr" were set to work subverting the Czechs as part of Hitler's strategy to acquire the Sudetenland. Before the spring of 1938 came to an end, the conservative members of the German Foreign Office and many ranking officers in the military began sharing their fears over an impending international disaster and the threat of another catastrophic European war based on Hitler's actions. A conspiratorial group formed around General Erwin von Witzleben and Admiral Canaris as a result. Throughout the process, Canaris and subordinates such as Helmuth Groscurth worked to prevent war to the extent feasible. Meanwhile, Canaris participated in the plots among the military leadership for a coup against Hitler and attempted to open up covert communication lines with the British, convinced that Hitler would push Europe to war. Before the actual invasion of Poland occurred, the "Abwehr" went so far as to send a special emissary, Ewald von Kleist-Schmenzin, to London in order to warn them. Subverting the Nazi government with warnings to the Allies was but one part of the picture, as this move did not stop or deter Canaris from obeying Hitler's orders to provide 150 Polish army uniforms and small arms to Himmler and Heydrich for their staged attack on a German radio station by 'Polish' forces; one act which Hitler used to justify his assault on Poland.