1914-1918
Aerial combat first evolved during World War I
- French aviator Roland Garros became the first flying "ace" (a pilot who shoots down five or more enemy aircraft) when he affixed machine guns to his aircraft (Morane-Saulnier Type L) which fired through the propeller, although he used crude metal deflector plates (the bullets hit the propeller but were deflected aside) rather than interruptor gear. Dutch aircraft designer Anthony Fokker developed the first interruptor for the machine gun, which prevents bullets from hitting the propeller of the aircraft.
- Significant aircraft: