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Why did Charles de Gaulle leave France for Britain in June 1940?

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Charles de Gaulle left France for Britain in June 1940 because the government of Paul Reynaud, in which de Gaulle served as undersecretary of state for defense and war, was replaced by a new administration led by Marshal Philippe Pétain.12

Unlike de Gaulle, who was committed to continuing the war effort, Pétain’s government intended to seek an armistice with Germany following the collapse of French military resistance. Recognizing that the new leadership would effectively take France out of the conflict, de Gaulle traveled to England to organize and lead the Free French forces, broadcasting his first appeal to his compatriots from London on June 18, 1940. His decision to continue the fight was a principled stand against capitulation, for which he was later sentenced to death in absentia by a French military court.123