Based on wartime letters published in the Atlantic magazine, this 1918 volume recounts the author's World War I experiences as a pilot in the Lafayette Escadrille, the French-American flying corps, and, after American entry into the war, the 94th Pursuit Squadron of the Army Air Service. Hall's exciting adventures in the "Penguin" aircrafts describe a "learn to fly by trial and error" method, terrifying to say the least.