Chamberlain, faced with the prospect of a German invasion, flew to Berchtesgaden on 15 September to negotiate directly with Hitler. Hitler now demanded that Chamberlain accept not merely Sudeten self-government within Czechoslovakia, but the absorption of the Sudeten lands into Germany. Chamberlain became convinced that refusal would lead to war. The geography of Europe was such that Britain and France could forcibly prevent the German occupation of the Sudetenland only by the invasion of Germany. Chamberlain, therefore, returned to Britain and agreed to Hitler's demands. Britain and France told the Czech president Edvard Beneš that he must hand to Germany all territory with a German majority. Hitler increased his aggression against Czechoslovakia and ordered the establishment of a Sudeten German paramilitary organisation, which proceeded to carry out terrorist attacks on Czech targets.