The dominance by Henlein's political party of the Sudetenland in the 1930s set off the crisis that led to the Munich Agreement on 30 September 1938. On 12 March 1938, the British Foreign Secretary Lord Halifax once again told Jan Masaryk, the Czechoslovak minister in London, that his government should try to negotiate with Henlein, only to be rebuffed with Masaryk saying that Henlein was not to be trusted and it was a waste of time to talk to him. The "Anschluss" in March 1938 caused much excitement in the Sudetenland and throughout the month of March the StP had huge rallies where portraits of Hitler were prominently displayed while the crowds shouted ""Ein Volk, ein Reich, ein Führer!"" and "Home to the "Reich"!". Henlein in his speeches at these rallies now declared that now more than ever his party was the "only" party that spoke for the Sudetenland. Two of the Sudeten "activist" parties, the Christian Social Party and the German Agrarian Party, both quit the government in Prague, declaring that they now stood behind "Führer" Henlein.