Mitrailleuse
A mitrailleuse (; from French "mitraille", "grapeshot") is a type of volley gun with multiple barrels of rifle calibre that can fire either multiple rounds at once or several rounds in rapid succession. The earliest true mitrailleuse was invented in 1851 by Belgian Army captain Fafschamps, 10 years before the advent of the Gatling gun. It was followed by the Belgian Montigny mitrailleuse in 1863. Then the French 25 barrel ""Canon à Balles"", better known as the Reffye "mitrailleuse", was adopted in great secrecy in 1866. It became the first rapid-firing weapon deployed as standard equipment by any army in a major conflict when it was used during the Franco-Prussian War of 1870–71. A steel block containing twenty-five 13 mm (.51 calibre) centre-fire cartridges was locked against the breech before firing. With the rotation of a crank, the 25 rounds were discharged in rapid succession. The sustainable firing rate of the Reffye mitrailleuse was 100 rounds per minute. The maximum effective range of the Reffye "mitrailleuse" was about 2000 yards; a distance which placed their batteries beyond the reach of Prussian Dreyse needle rifle fire. Reffye mitrailleuses were deployed in six gun batteries and were manned by artillery personnel. They were not infantry support weapons, but rather a form of special artillery.
Morane-Saulnier L
In December 1914 the famous French aviator Roland Garros, then serving with "Escadrille 23", worked with Raymond Saulnier to create a gun synchronizer, using the gas operated Hotchkiss light machine gun. However the firing rate fluctuated too much for the synchronizer to function properly. As an interim measure, they then designed a "safety backup" in the form of braced "deflectors" (metal wedges) fitted to the rear surfaces of the propeller blades at the points where they could be struck by a bullet. Garros took his Type L fighter into combat with the deflectors in March 1915 and achieved immediate success, shooting down three German aircraft in April, a noteworthy feat at the time. The bullets that the French used were not likely to damage the harder steel of the wedges themselves. On 18 April 1915, Garros' deflector-equipped Type L force-landed behind German lines and was captured before he could destroy it.