Appeal of 18 June as the beginning of the Resistance and Free French, historians have shown that the appeal was heard only by a minority of French people. De Gaulle's 22 June 1940 speech on the BBC was more widely heard. General de Gaulle became the "de facto" leader of the Free French Forces that had escaped to London in June 1940. Marshal Philippe Pétain, a hero of World War I, pledged to sign an armistice with Nazi Germany, and led the collaborating Vichy government while the Germans occupied the country's northern portion and several leading politicians, including Georges Mandel, Leon Blum, Pierre Mendès
Battle of Britain alone was insufficient; the German naval staff had already produced a study (in 1939) on the possibility of an invasion of Britain and concluded that it also required naval superiority. The Luftwaffe said invasion could only be "the final act in an already victorious war." Hitler first discussed the idea of an invasion at a 21 May 1940 meeting with Grand Admiral Erich Raeder, who stressed the difficulties and his own preference for a blockade. OKW Chief of Staff Jodl's 30 June report described invasion as a last resort once the British economy had been damaged and the Luftwaffe had