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. The different variants of the mitrailleuse concept were distinguished by their number of barrels and their different calibers, as the following table summarizes. 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