In the early days of flight, no one imagined the airplane as a weapon of war. Inevitably, World War I proved the catalyst that was to change the face of battle forever. But at the war's outbreak, military aircraft, most of which were slow and stable two-seat biplanes, were held to have only one useful function: reconnaissance. It was not long, however, before pilots had the idea of dropping explosives from their cockpits. Once machine guns began to be fitted to aircraft, two factors immediately became clear: reconnaissance aircraft needed to be defended, and enemy machines had to be attacked and destroyed. So was born the "scout" (as fighter aircraft were known then), to be followed, before long, by the "aces" who flew them. In this wide-ranging and extremely readable study of the fighter pilot's skills, training and experiences from the early days of flight, and the development of the machines they flew, the author, who has written widely on aerial warfare, takes the reader on a journey from the first flying machines in the late 19th century, to the development of the specialized fighter aircraft armed with one or more machine guns, and capable, by the war's end, of speeds of 140mph and more. Along the way he takes in the development of the devices that allowed a machine gun to fire through the propeller arc, the coming of aerial photography and airborne wireless, parachutes, engine design, test flying. and problems of flight, including the dreaded "spin" that killed so may pilots, and the invention of aerial tactics such as the Immelmann Turn. Here, too, are the aces, the pilots who became famous and feted at home for their exploits, at a time when newspapers were filled with ever-lengthening casualty lists from the Western Front. Some, like Germany's Manfred von Richthofen--the "Red Baron"--Britain's James McCudden, and Eddie Rickenbacker of the USA, are still well-known today, while others like Raymond Collishaw of the Royal Naval Air Service, France's Rene Fonck, and Aleksandr Kazakov of the Imperial Russian Air Service are less prominent. In 1914 it was all new, this business of flying at the enemy. It is a story of creativity, of machines, experiments, turning points, ebb and flow, and heroes. Starting from almost nothing, the fighting men tried out their ideas and established the principles that ultimately made aircraft the most important weapon of all.