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