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The Madsen is a
light machine gun A light machine gun (LMG) is a light-weight machine gun designed to be operated by a single infantryman, with or without an assistant, as an infantry support weapon. LMGs firing cartridges of the same caliber as the other riflemen of the sam ...
that Julius A. Rasmussen and Theodor Schouboe designed and proposed for adoption by Colonel
Vilhelm Herman Oluf Madsen Vilhelm Herman Oluf Madsen (11 April 1844 – 14 June 1917) was a Danish politician, minister, army officer, businessman and inventor. He was War Minister in the Deuntzer Cabinet 1901–1905. Career He began his military career in 1859 and serv ...
, the Danish Minister of War, and that the
Royal Danish Army The Royal Danish Army ( da, Hæren, fo, Herurin, kl, Sakkutuut) is the land-based branch of the Danish Defence, together with the Danish Home Guard. For the last decade, the Royal Danish Army has undergone a massive transformation of structures ...
adopted in 1902. It was the world's first true light machine gun produced in quantity and Madsen was able to sell it in 12 calibres to over 34 countries. The gun saw extensive combat usage for over 100 years, with continued use in limited quantities worldwide into the 2010s. The Madsen was produced by Compagnie Madsen A/S (later operating as Dansk Rekyl Riffel Syndikat A/S and then Dansk Industri Syndikat A/S).


Design details

The design dates to 1880s, with the Danish Self Loading rifle M.1888 (; ), being a precursor design. In 1883 Captain Vilhelm Herman Oluf Madsen (a Danish artillery officer), and Rustmester Rasmussen (a weapons technician at the Danish Arsenal), began working on a recoil-operated self-loading rifle; Madsen developed the idea and Rasmussen fabricated the actual weapons. The rifle used a non-removable stripper clip that used gravity to feed rounds to the action; when the gun was not in use one could fold the clip down to cover the opening. The rifle used the 8×58RD cartridge, first in black-powder and then in a much more powerful smokeless powder version. The design was not successful. An improved design in 1896 gave the rifle an enclosed, but still gravity-fed, magazine. This version saw some 50–60 rifles being produced, but they were only issued to the Danish navy for use by coastal fortifications troops. Investors formed a company (the Dansk Riffel Syndikat; DRS), in 1898 to commercialise the rifle, and bought the patent rights from Madsen and Rasmussen in exchange for royalties on future production. By this time Madsen had left the project to become
Minister of War A defence minister or minister of defence is a cabinet official position in charge of a ministry of defense, which regulates the armed forces in sovereign states. The role of a defence minister varies considerably from country to country; in som ...
in Denmark. In 1899 Lieutenant
Jens Schouboe Jens may refer to: * Jens (given name), a list of people with the name * Jens (surname), a list of people * Jens, Switzerland, a municipality * 1719 Jens, an asteroid See also * Jensen (disambiguation) * Jenssi Joensuu (; krl, Jovensuu; ) ...
became the manager for the DRS, and a number of subsequent patents bear his name. Consequently, the Madsen rifle is sometimes referred to as the Schouboe rifle. In 1901 he patented the design for the Madsen machine gun. The original Madsen machine guns used black-powder cartridges that quickly jammed the action. However, once the design was tried with 6.5mm smokeless powder rounds it worked well. The Madsen has a rather sophisticated and unique operating cycle. The machine gun uses a mixed
recoil-operated Recoil operation is an operating mechanism used to implement locked breech, autoloading firearms. Recoil operated firearms use the energy of recoil to cycle the action, as opposed to gas operation or blowback operation using the pressure of the p ...
locking system with a hinged bolt that is patterned after the lever-action Peabody Martini
breechblock A breechblock (or breech block) is the part of the firearm action that closes the breech of a breech loading weapon (whether small arms or artillery) before or at the moment of firing. It seals the breech and contains the pressure generated by th ...
. The recoil operation is part short and part long recoil. After firing a round to start the
open bolt A firearm is said to fire from an open bolt if, when ready to fire, the bolt and working parts are held to the rear of the receiver, with no round in the chamber. When the trigger is actuated, the bolt travels forward, feeds a cartridge from t ...
firing cycle, the initial recoil impulse drives the barrel, barrel extension, and bolt to the rear. A pin on the right side of the bolt moves backward in grooves in an operating cam plate mounted to the right side of the receiver. After of travel, the bolt is cammed upward, away from the breech (the "short" portion of the recoil system). The barrel and barrel extension continue to move rearward to a point slightly exceeding the combined overall length of the cartridge case and projectile (the long portion of the recoil system, responsible for the weapon's low rate of fire). After the breech is exposed, an odd lever-type extractor/ejector, mounted under the barrel, pivots to the rear, extracts the empty case, and ejects it through the bottom of the receiver. The bolt's operating cam then forces the bolt face to pivot downward, aligning a cartridge feed groove in the left side of the bolt with the chamber. While the bolt and barrel are returning forward, a cartridge-rammer lever, mounted on the barrel extension, pivots forward, loading a fresh cartridge.


Operational use


Up to and including World War I

The Madsen was considered expensive to produce, but was known for its reliability. Thirty-four countries bought the gun, in a dozen different calibres, before and after
World War I World War I (28 July 1914 11 November 1918), often abbreviated as WWI, was one of the deadliest global conflicts in history. Belligerents included much of Europe, the Russian Empire, the United States, and the Ottoman Empire, with fightin ...
. They were used by all sides in the
Mexican Revolution The Mexican Revolution ( es, Revolución Mexicana) was an extended sequence of armed regional conflicts in Mexico from approximately 1910 to 1920. It has been called "the defining event of modern Mexican history". It resulted in the destruction ...
. In Britain, the Rexer Arms Company manufactured the Madsen without license from 1905. The guns were known as the Rexer or DDRS and exported worldwide. The
Imperial Russian Army The Imperial Russian Army (russian: Ру́сская импера́торская а́рмия, tr. ) was the armed land force of the Russian Empire, active from around 1721 to the Russian Revolution of 1917. In the early 1850s, the Russian Ar ...
bought 1,250 Madsens for the cavalry and deployed them during the
Russo-Japanese War The Russo-Japanese War ( ja, 日露戦争, Nichiro sensō, Japanese-Russian War; russian: Ру́сско-япóнская войнá, Rússko-yapónskaya voyná) was fought between the Empire of Japan and the Russian Empire during 1904 and 1 ...
. The
Imperial Russian Air Service The Imperial Russian Air Service (russian: Императорскій военно-воздушный флотъ, , Emperor's Military Air Fleet) was an air force founded in 1912 for Imperial Russia."''12 августа 1912 года прик ...
used Madsens to equip their
Morane-Saulnier G The Morane-Saulnier G was a two-seat sport and racing monoplane produced in France before the First World War.Taylor 1989, 648"The Illustrated Encyclopedia of Aircraft", 2539 It was a development of the racing monoplanes designed by Léon Morane a ...
and
Morane-Saulnier L The Morane-Saulnier L, or Morane-Saulnier Type L, or officially MoS-3, was a French parasol wing one or two-seat scout aeroplane of the First World War. The Type L became one of the first successful fighter aircraft when it was fitted with a si ...
monoplanes, and as its open bolt firing cycle made it difficult to fire through a propeller, the Madsen's gun mounting had to fire over the propeller. The
German Army The German Army (, "army") is the land component of the armed forces of Germany. The present-day German Army was founded in 1955 as part of the newly formed West German ''Bundeswehr'' together with the ''Marine'' (German Navy) and the ''Luftwaf ...
deployed the Madsen in 7.92 mm calibre in 1914, arming infantry companies, mountain troops and later storm troopers. China would acquire about 150 Madsens by 1913, and begin manufacturing a domestic copy at
Guangdong Guangdong (, ), alternatively romanized as Canton or Kwangtung, is a coastal province in South China on the north shore of the South China Sea. The capital of the province is Guangzhou. With a population of 126.01 million (as of 2020) ...
Arsenal in 1909.


Inter-war era

Among the fighting forces with the Madsen in their arsenals in the immediate aftermath of World War I were the
Czechoslovak Legions , image = Coat of arms of the Czechoslovak Legion.svg , image_size = 200px , alt = , caption = Czechoslovak Legion coat of arms , start_date ...
in Russia, fighting the
Bolshevik The Bolsheviks (russian: Большевики́, from большинство́ ''bol'shinstvó'', 'majority'),; derived from ''bol'shinstvó'' (большинство́), "majority", literally meaning "one of the majority". also known in English ...
s in
Siberia Siberia ( ; rus, Сибирь, r=Sibir', p=sʲɪˈbʲirʲ, a=Ru-Сибирь.ogg) is an extensive geographical region, constituting all of North Asia, from the Ural Mountains in the west to the Pacific Ocean in the east. It has been a part of ...
. The Madsen also saw service in
China China, officially the People's Republic of China (PRC), is a country in East Asia. It is the world's most populous country, with a population exceeding 1.4 billion, slightly ahead of India. China spans the equivalent of five time zones and ...
during the Warlord era. By 1935, China would acquire roughly 300 Madsen machine guns, with under 100 of these being used for
Malmö Flygindustri Malmö Flygindustri was a small aviation and car company in south Sweden which specialized in small single-propeller aircraft and various plastic objects. It was later acquired by SAAB. Products ;Aircraft * MFI-9 * MFI-10 Vipan * BA-12 Sländan ...
, SIAI, and
Caproni Caproni, also known as ''Società de Agostini e Caproni'' and ''Società Caproni e Comitti'', was an Italian aircraft manufacturer. Its main base of operations was at Taliedo, near Linate Airport, on the outskirts of Milan. Founded by Giovan ...
aircraft.
Paraguay Paraguay (; ), officially the Republic of Paraguay ( es, República del Paraguay, links=no; gn, Tavakuairetã Paraguái, links=si), is a landlocked country in South America. It is bordered by Argentina to the south and southwest, Brazil to th ...
bought the Madsen in the 1920s and early 1930s as that country quietly girded for war with
Bolivia , image_flag = Bandera de Bolivia (Estado).svg , flag_alt = Horizontal tricolor (red, yellow, and green from top to bottom) with the coat of arms of Bolivia in the center , flag_alt2 = 7 × 7 square p ...
over mutual claims to the
Gran Chaco The Gran Chaco or Dry Chaco is a sparsely populated, hot and semiarid lowland natural region of the Río de la Plata basin, divided among eastern Bolivia, western Paraguay, northern Argentina, and a portion of the Brazilian states of Mato Gro ...
region, and it served in the Paraguayan army in the
Chaco War The Chaco War ( es, link=no, Guerra del Chaco, gn, Cháko Ñorairõ7.65×53 Mauser) during the conflict. The
Argentine Army The Argentine Army ( es, Ejército Argentino, EA) is the land force branch of the Armed Forces of the Argentine Republic and the senior military service of Argentina. Under the Argentine Constitution, the president of Argentina is the commander- ...
detachment that protected neutrality along the border with Paraguay and Bolivia during the
Chaco War The Chaco War ( es, link=no, Guerra del Chaco, gn, Cháko Ñorairõ