During the Second World War, British Prime Minister Churchill, who opposed the agreement when it was signed, decided not to abide by the terms of the post-war agreement and to bring the Sudetenland back to post-war Czechoslovakia. On August 5, 1942, Foreign Minister Anthony Eden sent Jan Masaryk the following note: The areas chosen for the referendum are not quite the same as in Godesberg`s ultimatum. For example, the industrial city and the railway node of Brno are not included. But the Germans will be so close to this city that it will be at their mercy. In addition, it has a small German minority (about 12 per cent of the total population) who, under Hitler`s pressure, will be its true administrators. Each village or commune with a German majority (and there are many scattered in Czechoslovakia and up to the Ruthenia of the Carpathians) in regions where the Czechs are very majority, can be transformed by the instrument of the referendum into a German fortress that dominates the surrounding land like the castle of a barrel of medieval brigands. With the help of the referendum, Hitler could take control of factories, railways and strategic points. In a short time, without war and without serious resistance from Western forces, he could become the master of Czechoslovakia. The Munich Agreement (Czech: Mnichovska dohoda); in Slovak: Mnechovska dohoda; in German: Munchner Abkommen) or Munchner Verrat (Czech: Mnichovska zrada; The Slovak: Mnechovska zrada) was an agreement reached on 30 September 1938 in Munich by Nazi Germany, the United Kingdom, the Third French Republic and the Kingdom of Italy. It granted Germany the “transfer of the German territory of the Sudetenland” from Czechoslovakia.  Most of Europe celebrated the agreement because it prevented the war threatened by Adolf Hitler by allowing the annexation of the Sudetenland by Nazi Germany, a region of Western Czechoslovakia inhabited by more than 3 million people, mainly German-speaking. Hitler declared that this was his last territorial claim in Europe, and the choice seemed to lie between war and appeasement.
On his way back from Munich, Chamberlain told an excited crowd at Heston airport: “It is peace for our time” and he praised the agreement he had signed with Hitler. This was the culmination of the policy of appeasement. Six months later, Hitler stopped his promises and ordered his armies to invade Prague. Within a year, Britain and France were at war with 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.   Czechoslovakia was informed by Great Britain and France that it could either oppose Nazi Germany alone or submit to the prescribed annexations