In the spring of 1938, Hitler openly began to support calls from German spokesmen living in the Sudetenland region of Czechoslovakia for closer relations with Germany. Hitler had recently annexed Austria to Germany and the conquest of Czechoslovakia was the next step in his plan to create a "Greater Germany". The Czechoslovakian government hoped that Britain and France would help in the event of a German invasion, but British Prime Minister Chamberlain tried to avoid war. He made two trips to Germany in September and offered favorable agreements to Hitler, but Fuhrer responded to his demands. The Munich Pact was an agreement reached on 29 September 1938 in Munich between Germany, Great Britain, France and Italy on the abandonment of the territory to Germany. Meanwhile, the British government has asked Benea to ask for a mediator. As he did not want to sever his government`s relations with Western Europe, the heirs reluctantly agreed. The British appointed Lord Runciman, the former Liberal cabinet minister, who arrived in Prague on 3 August to convince Benes to accept an acceptable plan for the Sudeten Germans.  On 20 July, Bonnet informed the Czechoslovakian ambassador in Paris that France, while publicly declaring its support for the Czechoslovakian negotiations, was not prepared to go to war on the Sudetenland.  In August, the German press was full of stories of Czechoslovakian atrocities against the Sudeten Germans, with the intention of forcing the West to put pressure on the Czechoslovakians to make concessions.
 Hitler hoped that the Czechoslovaks would refuse and that the West would feel morally justified in abandoning the Czechoslovaks to their fate.  In August, Germany sent 750,000 troops along the border with Czechoslovakia, officially as part of military maneuvers.   On September 4 or 5, Erbe presented the fourth plan, which met almost all of the requirements of the agreement. The Sudeten Germans were invited by Hitler to the prairies to avoid compromise, and the SdP organized demonstrations which, on 7 September, provoked a police operation in Ostrava, during which two of its deputies were arrested.  The Sudeten Germans used the incident and the false allegations of other atrocities as a pretext to interrupt further negotiations.   Later in the meeting, a pre-arranged deception was made to influence and pressure Chamberlain: one of Hitler`s accomplices entered the room to inform Hitler of other Germans killed in Czechoslovakia, and Hitler then shouted: "I will avenge each of them.