At the outbreak of World War II, de Gaulle commanded a tank brigade attached to the French Fifth Army. In May 1940, after assuming command as temporary brigadier general in the 4th Armoured Division—the rank that he retained for the rest of his life—he twice had the opportunity to apply his theories on tank warfare. He was mentioned as “an admirable, energetic, and courageous leader.” On June 6 he entered the government of Paul Reynaud as undersecretary of state for defense and war, and he undertook several missions to England to explore the possibilities of continuing the war. When the Reynaud government was replaced 10 days later by that of Marshal Pétain, who intended to seek an armistice with the Germans, de Gaulle left for England. On June 18 he broadcast from London his first appeal to his compatriots to continue the war under his leadership. On August 2, 1940, a French military court tried and sentenced him in absentia to death, deprivation of military rank, and confiscation of property.
De Gaulle entered his wartime career as a political leader with tremendous liabilities. He had only a handful of haphazardly recruited political supporters and volunteers for what were to become the Free French Forces. He had no political status and was virtually unknown in both Britain and France. But he had an absolute belief in his mission and a conviction that he possessed the qualities of leadership. He was totally devoted to France and had the strength of character (or obstinacy, as it often appeared to the British) to fight for French interests as he saw them with all the resources at his disposal.
In his country, to the politicians on the political left, a career officer who was a practicing Roman Catholic was not an immediately acceptable political leader, while to those on the right he was a rebel against Pétain, who was a national hero and France’s only field marshal. Broadcasts from London, the action of the Free French Forces, and the contacts of resistance groups in France either with de Gaulle’s own organization or with those of the British secret services brought national recognition of his leadership; but full recognition by his allies came only after the liberation of Paris in August 1944.
https://www.britannica.com/biography/Charles-de-Gaulle-president-of-France
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