Mitrailleuse
The first "mitrailleuse" was a manually fired 50-barrel volley gun originally developed in Belgium in 1851 by the Belgian Army Captain Fafschamps, who made a rough prototype and drawings of his invention. 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, designed by Jean-Baptiste Verchère de Reffye with the collaboration of 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.
Montigny mitrailleuse
Napoleon III showed personal interest in the mitrailleuse. Montigny had approached the French army for the purpose of a sale. Experiments to evaluate the weapon began in 1863 in a French facility near Paris but the decision was made to build a similar weapon by sole French means. Manufacture began at Meudon in 1866 under the direction of Verchères de Reffye and the undisclosed assistance of Montigny. Hence the weapon is usually known as the "Reffye mitrailleuse". Altogether 215 mitrailleuses were manufactured for the French Army before the Franco-Prussian War of 1870-71. They were of the 13mm, 25-barrels type, and used elongated shotgun shell style cartridges instead of foil cartridges as in the Montigny mitrailleuse. The weapon, which was on an artillery carriage, was deployed in six gun batteries and manned by artillery personnel. Most of the time, they were used quite ineffectively to engage distant targets. When the weapon was engaged at the Battle of Gravelotte in 1871, in an infantry support role and at shorter distances, it produced devastating effects.