On September 12, 1938, Hitler told the Sudeten Germans that he would support them. On the 15th, Neville Chamberlain met with Hitler in a last-ditch attempt to stop the war. Hitler moderated his demands and said he was interested only in part of Czechoslovakia. Chamberlain thought that was reasonable and that Hitler would be satisfied. However, on the 22nd, Hitler changed his demands and now said that he wanted all of the Sudetenland. The British Navy mobilised, and war seemed imminent. 