Anthony Fokker invents the synchronized machine gun and demonstrates it at several locations: Döberitz, west of Berlin; Seventh Army; Fifth Army at Stenaiy, France; and then Douai, where Oswald Boelcke and Max Immelmann were stationed with Flieger-Abteilung (Section) 62.

The British War Office issues instructions specifying the aircraft and armament RFC squadrons are to have ready for defense of the United Kingdom against German airships. One aircraft is to be kept ready for immediate takeoff at all times (on alert), with the Martinsyde Scout preferred over other aircraft. The instruction also lists a specific mix and numbers of weapons the aircraft are to carry, including bombs, grenades, and incendiary darts.