A mitrailleuse (; from French mitraille, "grapeshot") is a type of volley gun with barrels of rifle calibre that can fire either all rounds at once or in rapid succession. The earliest true mitrailleuse was theorized and proposed in 1851 by Belgian Army captain Fafschamps, ten 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 and its maximum range was about 2000 yards (1800 m), a distance that placed their batteries beyond the reach of Prussian Dreyse needle rifle fire. Reffye mitrailleuses were deployed in six-gun batteries and were manned by gunners as a form of special artillery.
Although innovative and capable of good ballistic performance, the Reffye mitrailleuse was a tactical failure because its basic concept and operational use were flawed. Only 210 Reffye mitrailleuses were in existence at the beginning of the Franco-Prussian War in 1870. Their field use was discontinued by the French Army after 1871. After the Gatling gun was replaced in service by newer recoil- or gas-operated weapons, multi-barrelled weapons fell into disuse for many decades. Some examples were developed during the interwar years but only as prototypes or were rarely used. The word mitrailleuse became the generic term for a machine gun in the French language because of its early appearance in the field of weapons, although the mitrailleuse was manually operated.
Origin
The first "mitrailleuse" was a manually fired 50-barrel volley gun. It was developed in Belgium in 1851 by Belgian Army Captain Fafschamps,.. who made a rough prototype and drawings of his invention.Machine Guns by James H. Willbanks p.35 The system was improved during the 1850s by Louis Christophe and the Belgian engineer Joseph Montigny, with the completion of the 37-barrel Montigny mitrailleuse in 1863. From 1859, Joseph Montigny proposed his design to Napoleon III, which led to the development of the French Reffye mitrailleuse, which was designed by Jean-Baptiste Verchère de Reffye in collaboration with Montigny, and which was adopted by the French Army in 1865. Initially kept under wraps as a secret weapon, it was widely used in battle by French artillery during the Franco-Prussian War (1870–71). Smaller numbers of other designs, including the Gatling gun, were also purchased by the French government during the latter part of that conflict. The Reffye model had initially been built in small numbers and in secrecy: only about 200 were available at the beginning of the conflict. This also kept regular French field artillery in a neglected position in the eyes of French emperor Napoleon III, with dire consequences during the Franco-Prussian War of 1870–71.
Technical characteristics Design
Several variants of the mitrailleuse concept were developed, with common elements to all of their designs. They were characterized by a number of rifled barrels clustered together and mounted on a conventional artillery chassis or (in the case of one model) a tripod. The ammunition was secured in a single block and placed into the breech, behind the open ends of the barrels. All of the barrels were loaded simultaneously by a manual closing lever or large horizontal screw. A second lever could be worked rapidly (or in some models, a crank could be turned) to fire each barrel in succession. This earned the weapon its French nickname of moulin à café (coffee grinder). A very similar name was earned by the hand-cranked, mechanically loaded, continuous-firing, "coffee mill gun" in America during the American Civil War.
The ammunition plate or block had to be removed by hand before another loaded plate could be inserted. Unlike in the Gatling gun and later rapid-firing automatic weapons, the entire loading and firing process was manual. The mitrailleuse's major innovation was that it greatly increased the speed of these processes when compared to standard infantry rifles of the era.Terry Gander, Machine Guns, p. 13 (Crowood Press, 2003)
The different variants of the mitrailleuse concept were distinguished by their number of barrels and their different calibers, as the following table summarizes.
Variant name Barrels Barrel arrangement Caliber Date1 Notes Fafschamps 50 Clustered 1851 Needle fire, paper cartridges. Prototype and drawings Christophe-Montigny 37 Clustered 11 mm (0.4 in) 1863 Privately developed and used primarily by the Belgian Army Reffye 25 In five rows (5 × 5) 13 mm (0.5 in) 1865 Widely used by the French Army during the Franco-Prussian War Bollée 30 Two circular rings (18 in the outer ring, 12 in the inner) 13 mm (0.5 in) 1870 Used by the French Army of the Loire during the Franco-Prussian WarS Shann, The French Army 1870–71 Franco-Prussian War, p. 39 (Osprey Publishing, 1991) Chevalier et Grenier 16 Two horizontal rows (2 × 8) 11 mm (0.4 in) 1870 Gabert 04 Four barrels each with two chambers. While four chambers are in use, four are reloaded.2 11 mm (0.4 in) 1870 Tripod-mounted, unlike the other carriage-mounted variants Notes: Date developed Translated from the website: www.mitrailleuse.fr/Historique/Aballes/Aballes.htm
Most variants of the mitrailleuse were mounted on an artillery-style carriage. This made them heavy and cumbersome to handle on the battlefield, with gun and carriage weighing up to 900 kg (2,000 lb).
Ammunition and firing rates The mitrailleuse's dependence on manual loading meant that its firing rate depended greatly on the skill of its operators. A skillfully manned Reffye mitrailleuse could sustain four volleys (100 rounds) per minute in ordinary operation and reach five volleys (125 rounds) per minute during emergencies. The rapidity of discharge of each individual volley (25 rounds) was controlled by the gunner's action on a small manual crank on the right side of the breech. The weapon's 25 barrels were not discharged all at once, but in rapid succession. Because it was so heavy (1,500 lbs), the Reffye mitrailleuse did not recoil during firing and thus did not need to be re-sighted on its target after each volley. This essential absence of recoil during firings was promoted by Reffye as a considerable advantage over conventional field artillery. Each regular battery of Reffye mitrailleuses lined up six guns firing together, more or less side by side.
The Reffye mitrailleuse used a 13 mm (.512 inch) centerfire cartridge, designed by Gaupillat, which represented the state of the art in ammunition design at the time.Huon, 1986 It was rather similar to an elongated modern shotgun shell: centerfire with a rimmed brass head and a dark blue hardened cardboard body.Huon, Jean. Military rifle and machine gun cartridges (Arms & Armor Press, 1988) The , 13 mm (0.512 inch) patched bullet was propelled by 185 grains (12 grams) of compressed black powder at a muzzle velocity of , three and a half times more powerful than Chassepot or Dreyse rifle ammunition. This was, by far, the most potent rifle caliber ammunition in existence at the time. The Montigny and Reffye mitrailleuse systems were not designed to function with paper cartridges such as the 11 mm Chassepot combustible paper cartridge.
The 13 mm centerfire Reffye mitrailleuse cartridges were loaded into interchangeable steel breech blocks, unlike the Montigny mitrailleuse, whose ammunition was held by the cartridge base in plates. When firing the mitrailleuse, three breech blocks were kept in continuous use: one being fired, one being pressed down on the extractor and one being loaded from a single pre-packaged 25-round box. Adjusting the elevation of the mitrailleuse in accordance to the distance to the designated target was performed with an elevating screw identical to that on a regular artillery piece. The mitrailleuse's barrel could also be moved sideways while firing, to the right and left, in order to adjust for range and provide lateral sweeping fire if needed. The lateral sweep was narrow, however, thus most effective at far distances only. The weapon's field of fire was so narrow that Prussian soldiers were often hit by several bullets at once.McCormick, Dr. William, "On the Surgical Practice of the War" (Pall Mall Gazette, 1870) During an early engagement of the Franco-Prussian War, at Forbach in Alsace on August 6, 1870, a Prussian general officer (General Bruno von François) was brought down by a very closely spaced volley of four bullets. According to the Prussian regimental record, those four mitrailleuse bullets had been fired from 600 meters away. French artillery attempted to rectify this problem by developing special ammunition capable of firing three bullets from the same cartridge for short-range point-defence.
In summary, the Reffye mitrailleuse was rarely used to deliver sweeping fire at close range like modern machine guns. The mitrailleuse six-gun batteries had been designed to deliver fire on targets too distant to be reached with Chassepot infantry rifles or artillery grapeshot. To fulfill this role, at least during the early weeks of the campaign, the mitrailleuses were deployed together with the older "Napoleon" muzzle loaded field guns ("canon obusier de 12") used by the French Army during the Franco-Prussian War. The mitrailleuse crews are on record of having generally objected to being placed in proximity to regular artillery batteries.
Development The mitrailleuse is best known for its service with the French Army but in fact it was first used in Belgium in the 1850s as a static weapon to defend the moats of fortresses. It was a 50-barrel needle fire, paper cartridge weapon which had been designed by a Captain T.H.J. Fafschamps. Then, after 1863, it was improved with only 37 barrels, 11×70mmR centerfire ammunition and the weapon's placement on a wheeled artillery carriage. This transformation was carried out as an industrial venture by Christophe and Joseph Montigny of Fontaine-l'Évêque near Brussels, who sought to sell the new weapon to the rest of Europe.
The French military became interested in the Christophe and Montigny mitrailleuse in 1863 and the French Army's Artillery Committee undertook an investigation into the possible adoption of the Belgian weapon. However it was decided to do otherwise and to create a proprietary mitrailleuse weapon by sole French industrial means. In May 1864, General Edmond Le Bœuf submitted a preliminary report entitled Note sur le Canon à balles to the Emperor Napoleon III. Full-scale manufacture began in September 1865, in great secrecy, under the leadership of Lieutenant-Colonel Verchère de Reffye (1821–1880). Assembly and some manufacturing took place at the workshops in Meudon but many parts came from the private industrial sector. Production was slow due to limited funding (the army had already spent much of its five-year budget on the Mle 1866 Chassepot rifle), forcing Napoleon III to pay for development and manufacture out of secret funds.S Shann, L Delperier, French Army of Franco-Prussian War: Imperial Troops, p. 35–36 (Osprey Publishing, 1991) The new weapon was thoroughly tested in 1868 at the military firing range at Satory, near Versailles, in conditions of great secrecy. Due to a fear of spies, test guns were concealed in tents while being fired at distant targets. The mitrailleuse performed mechanically with remarkable efficiency and much was expected of it in a combat situation.