Although a mission to free French West Africa failed, the resistance gradually grew from French troops presiding in England to the French colonial territories of Chad, Cameroun, Moyen-Congo, French Equatorial Africa, and Oubangi-Chari (sub-Saharan Africa). With heavy cooperation from the United Kingdom, United States of America, and several parts of Africa, the Free French created the French National Committee.
The forces grew largely in 1942, when an underground resistance force began to grow; de Gaulle then sent Jean Moulin to France in order to rally more forces to the cause against the Nazis. In late 1942, British and American forces successfully invaded Northwestern Africa, and after the resignation of General Giraud, Algiers, Algeria became the official capital for the French National Committee. By 1944, de Gaulle was considered the "supreme authority" of the French Resistance movement.
When the Allies invaded Normany in 1944, the French Resistance movement had more than 300,000 troops; the Free French 1st Army participated in the Allies' invasion of France and Germany.
In August 1944, the French Forces of the Interior (or the French Resistance) traveled to Paris in order to liberate it from Nazi regime. On August 26, 1944, Paris was liberated. (Encyclopedia Britannica).
Sources: "Free French." Encyclopedia Britannica Online. Encyclopedia Britannica Inc., 2016.