Before the Munich Agreement, Hitler's determination to invade Czechoslovakia on 1 October 1938 had provoked a major crisis in the German command structure. The Chief of the General Staff, General Ludwig Beck, protested in a lengthy series of memos that it would start a world war that Germany would lose, and urged Hitler to put off the projected war. Hitler called Beck's arguments against war "kindische Kräfteberechnungen" ("childish force calculations"). On 4 August 1938, a secret Army meeting was held. Beck read his lengthy report to the assembled officers. They all agreed something had to be done to prevent certain disaster. Beck hoped they would all resign together but no one resigned except Beck. His replacement, General Franz Halder, sympathized with Beck and they both conspired with several top generals, Admiral Wilhelm Canaris (Chief of German Intelligence), and Graf von Helldorf (Berlin's Police Chief) to arrest Hitler the moment he gave the invasion order. This plan would only work if Britain issued a strong warning and a letter to the effect that they would fight to preserve Czechoslovakia. This would help to convince the German people that certain defeat awaited Germany. Agents were therefore sent to England to tell Chamberlain that an attack on Czechoslovakia was planned, and of their intention to overthrow Hitler if this occurred. The proposal was rejected by the British Cabinet and no such letter was issued. Accordingly, the proposed removal of Hitler did not go ahead. On this basis it has been argued that the Munich Agreement kept Hitler in power, although whether it would have been any more successful than the 1944 plot is doubtful.