When Congress declared war in April 1917, the Europeans had already deployed their third generation of fighters, equipped with machine guns and capable of speeds in excess of 100 miles per hour, while the American Air Service consisted of only a handful of aviators in unarmed trainers. In this first in-depth study of America's first air warriors, Frandsen shows how in just two years the 1st Pursuit Group organized, absorbed French and British technology and experience, and became a well-led, respected, and lethal force over the trenches of the Western Front.