In the cradle of aviation at the beginning of the Great War, France only had a few dozen military aircraft about which the general staff had limited knowledge. At the time of the Armistice of November 11, 1918, the French Air Force had become one of the most powerful in the world, bringing together 10,000 aircraft in nearly 300 squadrons. In four years, the French aviation industry had been able to produce 50,000, which had in turn been used to equip many allies, including Great Britain, Russia and especially the United States. This book, the first of its kind in French, provides a comprehensive overview of the evolution of the French Air Force from 1914 to 1918 through a historical narrative peppered with anecdotes and illustrated with many previously unpublished photos. Profiles of the most iconic aircraft constructed by France during the Great War are included and complemented by a full range of data on each piece of equipment.