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Irregular military is any
military A military, also known collectively as armed forces, is a heavily armed, highly organized force primarily intended for warfare. Militaries are typically authorized and maintained by a sovereign state, with their members identifiable by a d ...
component distinct from a country's regular armed forces, representing non-standard militant elements outside of conventional governmental backing. Irregular elements can consist of
militias A militia ( ) is a military or paramilitary force that comprises civilian members, as opposed to a professional standing army of regular, full-time military personnel. Militias may be raised in times of need to support regular troops or serve ...
,
private armies Private or privates may refer to: Music * "In Private", by Dusty Springfield from the 1990 album ''Reputation'' * Private (band), a Denmark-based band * "Private" (Ryōko Hirosue song), from the 1999 album ''Private'', written and also recorded ...
,
mercenaries A mercenary is a private individual who joins an War, armed conflict for personal profit, is otherwise an outsider to the conflict, and is not a member of any other official military. Mercenaries fight for money or other forms of payment rath ...
, or other non-state actors, though no single definition exists beyond exclusion from national service. Without standard military unit organization, various more general names are often used; such organizations may be called a ''troop'', ''group'', ''unit'', ''column'', ''band'', or ''force''. Irregulars are soldiers or warriors that are members of these organizations, or are members of special military units that employ irregular military tactics. This also applies to irregular
infantry Infantry, or infantryman are a type of soldier who specialize in ground combat, typically fighting dismounted. Historically the term was used to describe foot soldiers, i.e. those who march and fight on foot. In modern usage, the term broadl ...
and irregular
cavalry Historically, cavalry (from the French word ''cavalerie'', itself derived from ''cheval'' meaning "horse") are groups of soldiers or warriors who Horses in warfare, fight mounted on horseback. Until the 20th century, cavalry were the most mob ...
units.
Irregular warfare Irregular warfare (IW) is defined in United States joint doctrine as "a violent struggle among state and non-state actors for legitimacy and influence over the relevant populations" and in U.S. law as "Department of Defense activities not involvin ...
is warfare employing the tactics commonly used by irregular military organizations. This often overlaps with
asymmetrical warfare Asymmetric warfare (or asymmetric engagement) is a type of war between belligerents whose relative military power, strategy or tactics differ significantly. This type of warfare often, but not necessarily, involves Insurgency, insurgents, terro ...
, avoiding large-scale combat and focusing on small, stealthy, hit-and-run engagements.


Regular vs. irregular

The words "regular" and "irregular" have been used to describe combat forces for hundreds of years, usually with little ambiguity. The requirements of a government's chain of command cause the regular army to be very well defined, and anybody fighting outside it, other than official
paramilitary A paramilitary is a military that is not a part of a country's official or legitimate armed forces. The Oxford English Dictionary traces the use of the term "paramilitary" as far back as 1934. Overview Though a paramilitary is, by definiti ...
forces, are irregular. In case the legitimacy of the army or its opponents is questioned, some legal definitions have been created. In
international humanitarian law International humanitarian law (IHL), also referred to as the laws of armed conflict or the laws of war, is the law that regulates the conduct of war (''wikt:jus in bello, jus in bello''). It is a branch of international law that seeks to limit ...
, the term "irregular forces" refers to a category of combatants that consists of individuals forming part of the armed forces of a party to an armed conflict, international or domestic, but not belonging to that party's regular forces and operating inside or outside of their own territory, even if the territory is under occupation. The
Third Geneva Convention The Third Geneva Convention, relative to the treatment of prisoners of war, is one of the four treaties of the Geneva Conventions. The Geneva Convention relative to the Treatment of Prisoners of War was first adopted in 1929, but significantl ...
of 1949 uses "regular
armed forces A military, also known collectively as armed forces, is a heavily armed, highly organized force primarily intended for warfare. Militaries are typically authorized and maintained by a sovereign state, with their members identifiable by a ...
" as a critical distinction. The
International Committee of the Red Cross The International Committee of the Red Cross (ICRC) is a humanitarian organization based in Geneva, Switzerland, and is a three-time Nobel Prize laureate. The organization has played an instrumental role in the development of rules of war and ...
(ICRC) is a non-governmental organization primarily responsible for and most closely associated with the drafting and successful completion of the Third Geneva Convention Relative to the Treatment of Prisoners of War ("GPW"). The ICRC provided commentary saying that "regular armed forces" satisfy four
Hague Conventions (1899 and 1907) The Hague Conventions of 1899 and 1907 are a series of international treaty, treaties and declarations negotiated at two international peace conferences at The Hague in the Netherlands. Along with the Geneva Conventions, the Hague Conventions w ...
(Hague IV) conditions. In other words, "regular forces" must satisfy the following criteria: * being commanded by a person responsible for his subordinates to a party of conflict * having a fixed distinctive emblem recognizable at a distance * carrying arms openly * conducting operations in accordance with the laws and customs of war By extension, combat forces that do not satisfy these criteria are termed "irregular forces".


Types

The term "irregular military" describes the "how" and "what", but it is more common to focus on the "why" as just about all irregular units were created to provide a tactical advantage to an existing military, whether it was
privateer A privateer is a private person or vessel which engages in commerce raiding under a commission of war. Since robbery under arms was a common aspect of seaborne trade, until the early 19th century all merchant ships carried arms. A sovereign o ...
forces harassing shipping lanes against assorted
New World The term "New World" is used to describe the majority of lands of Earth's Western Hemisphere, particularly the Americas, and sometimes Oceania."America." ''The Oxford Companion to the English Language'' (). McArthur, Tom, ed., 1992. New York: ...
colonies on behalf of their European contractors, or Auxiliaries, levies, civilian and other standing irregular troops that are used as more expendable supplements to assist costly trained soldiers. Bypassing the legitimate military and taking up arms is an extreme measure. The motivation for doing so is often used as the basis of the primary label for any irregular military. Different terms come into and out of fashion, based on
political Politics () is the set of activities that are associated with decision-making, making decisions in social group, groups, or other forms of power (social and political), power relations among individuals, such as the distribution of Social sta ...
and emotional associations that develop. Here is a list of such terms, which is organized more or less from oldest to latest: *
Auxiliaries Auxiliaries are combat support, support personnel that assist the military or police but are organised differently from regular army, regular forces. Auxiliary may be military volunteers undertaking support functions or performing certain duties ...
– foreign or allied troops supplementing the regular army, organized from provincial or tribal regions. In the
Imperial Roman army The Imperial Roman Army was the military land force of the Roman Empire from 27 BC to 476 AD, and the final incarnation in the long history of the Roman army. This period is sometimes split into the Principate (27 BC – 284 AD) and the Dominate ...
, it became common to maintain a number of auxiliaries about equal to the
legionaries The ancient Rome, Roman legionary (in Latin ''legionarius''; : ''legionarii'') was a citizen soldier of the Roman army. These soldiers would conquer and defend the territories of ancient Rome during the Crisis of the Roman Republic, Republic and ...
. * Levies
feudal Feudalism, also known as the feudal system, was a combination of legal, economic, military, cultural, and political customs that flourished in Middle Ages, medieval Europe from the 9th to 15th centuries. Broadly defined, it was a way of struc ...
peasants and freemen liable to be called up for short-term military duty. *
Privateer A privateer is a private person or vessel which engages in commerce raiding under a commission of war. Since robbery under arms was a common aspect of seaborne trade, until the early 19th century all merchant ships carried arms. A sovereign o ...
– a "for-profit" private person or ship authorized and sponsored by a government by
letters of marque A letter of marque and reprisal () was a government license in the Age of Sail that authorized a private person, known as a privateer or corsair, to attack and capture vessels of a foreign state at war with the issuer, licensing internationa ...
to attack foreign vessels during wartime and to destroy or disrupt logistics of the enemy during "peacetime", often on the open sea by attacking its merchant shipping, rather than engaging its combatants or enforcing a blockade against them. *
Revolutionary A revolutionary is a person who either participates in, or advocates for, a revolution. The term ''revolutionary'' can also be used as an adjective to describe something producing a major and sudden impact on society. Definition The term—bot ...
– someone part of a
revolution In political science, a revolution (, 'a turn around') is a rapid, fundamental transformation of a society's class, state, ethnic or religious structures. According to sociologist Jack Goldstone, all revolutions contain "a common set of elements ...
, whether military or not. *
Guerrilla Guerrilla warfare is a form of unconventional warfare in which small groups of irregular military, such as rebels, Partisan (military), partisans, paramilitary personnel or armed civilians, which may include Children in the military, recruite ...
– someone who uses unconventional military tactics. The term tends to refer to groups engaged in open conflict, rather than
underground resistance Underground Resistance (commonly abbreviated to UR) are an American musical collective from Detroit, Michigan. Producing primarily Detroit techno since 1990 with a grungy four-track musical aesthetic, they are also renowned for their militant ...
. It was coined during the
Peninsula War The Peninsular War (1808–1814) was fought in the Iberian Peninsula by Kingdom of Portugal, Portugal, Spain and the United Kingdom of Great Britain and Ireland, United Kingdom against the invading and occupying forces of the First French ...
in Spain against France. * Montoneras – they were a type of irregular forces that were formed in the 19th century in Latin America. *
Franc-tireur (; ) were irregular military formations deployed by France during the early stages of the Franco-Prussian War (1870–71). The term was revived and used by partisans to name two major French Resistance movements set up to fight against Nazi G ...
– French irregular forces during the
Franco-Prussian War The Franco-Prussian War or Franco-German War, often referred to in France as the War of 1870, was a conflict between the Second French Empire and the North German Confederation led by the Kingdom of Prussia. Lasting from 19 July 1870 to 28 Janua ...
. The term is also used in international legal cases as a synonym for
unprivileged combatant An unlawful combatant, illegal combatant, or unprivileged combatant/belligerent is a person who directly engages in armed conflict and is considered a terrorist and therefore is deemed not to be a lawful combatant protected by the Geneva Conven ...
(for example the Hostages Trial 947–1948. *
Militia A militia ( ) is a military or paramilitary force that comprises civilian members, as opposed to a professional standing army of regular, full-time military personnel. Militias may be raised in times of need to support regular troops or se ...
– military force composed of ordinary citizens. * Ordenanças – The Portuguese territorial militia system from the 16th century to the 19th century. From the 17th century, it became the third line of the Army, serving both as local defense force and as the mobilization system that provided conscripts for the first (Regular) and second (Militia) lines of the Army. * Partisan – In the 20th century, someone part of a
resistance movement A resistance movement is an organized group of people that tries to resist or try to overthrow a government or an occupying power, causing disruption and unrest in civil order and stability. Such a movement may seek to achieve its goals through ei ...
. In the 18th and 19th century, a local conventional military force using irregular tactics. Often used to refer to resistance movements against the
Axis Powers The Axis powers, originally called the Rome–Berlin Axis and also Rome–Berlin–Tokyo Axis, was the military coalition which initiated World War II and fought against the Allies of World War II, Allies. Its principal members were Nazi Ge ...
during the
Second World War World War II or the Second World War (1 September 1939 – 2 September 1945) was a World war, global conflict between two coalitions: the Allies of World War II, Allies and the Axis powers. World War II by country, Nearly all of the wo ...
. *
Freedom fighter A freedom fighter is a person engaged in a struggle to achieve political freedom, particularly against an established government. The term is typically reserved for those who are actively involved in armed or otherwise violent rebellion. Termi ...
– A type of irregular military in which the main cause, in their or their supporters' view, is freedom for themselves or others. *
Paramilitary A paramilitary is a military that is not a part of a country's official or legitimate armed forces. The Oxford English Dictionary traces the use of the term "paramilitary" as far back as 1934. Overview Though a paramilitary is, by definiti ...
– An organization whose structure, tactics, training, subculture, and (often) function are similar to those of a professional military, but which is not part of a country's official or legitimate armed forces. *
Terrorist Terrorism, in its broadest sense, is the use of violence against non-combatants to achieve political or ideological aims. The term is used in this regard primarily to refer to intentional violence during peacetime or in the context of war aga ...
– An irregular military that targets
civilians A civilian is a person who is not a member of an armed force. It is illegal under the law of armed conflict to target civilians with military attacks, along with numerous other considerations for civilians during times of war. If a civilian enga ...
and other
non-combatants Non-combatant is a term of art in the law of war and international humanitarian law to refer to civilians who are not taking a direct part in hostilities. People such as combat medics and military chaplains, who are members of the belligerent arm ...
to gain political leverage. The term is almost always used pejoratively. Although reasonably well defined, its application is frequently controversial. *
False flag A false flag operation is an act committed with the intent of disguising the actual source of responsibility and pinning blame on another party. The term "false flag" originated in the 16th century as an expression meaning an intentional misrep ...
or pseudo-operations – Troops of one side dressing like troops of another side to eliminate or discredit the latter and its support, such as members of the Panzer Brigade 150, commanded by
Waffen-SS The (; ) was the military branch, combat branch of the Nazi Party's paramilitary ''Schutzstaffel'' (SS) organisation. Its formations included men from Nazi Germany, along with Waffen-SS foreign volunteers and conscripts, volunteers and conscr ...
commando A commando is a combatant, or operative of an elite light infantry or special operations force, specially trained for carrying out raids and operating in small teams behind enemy lines. Originally, "a commando" was a type of combat unit, as oppo ...
Otto Skorzeny Otto Johann Anton Skorzeny (12 June 1908 – 5 July 1975) was an Austrian-born German SS-''Standartenführer'' in the ''Waffen-SS'' during World War II. During the war, he was involved in a number of operations, including the removal from power ...
in
Operation Greif Operation Greif ( () was a special operation commanded by ''Waffen-SS'' commando Otto Skorzeny during the Battle of the Bulge in World War II. The operation was the brainchild of Adolf Hitler, and its purpose was to capture one or more of the brid ...
during the
Battle of the Bulge The Battle of the Bulge, also known as the Ardennes Offensive or Unternehmen Die Wacht am Rhein, Wacht am Rhein, was the last major German Offensive (military), offensive Military campaign, campaign on the Western Front (World War II), Western ...
in
World War II World War II or the Second World War (1 September 1939 – 2 September 1945) was a World war, global conflict between two coalitions: the Allies of World War II, Allies and the Axis powers. World War II by country, Nearly all of the wo ...
and
Selous Scouts The Selous Scouts was a special forces unit of the Rhodesian Army that operated during the Rhodesian Bush War from 1973 until the reconstitution of the country as Zimbabwe in 1980. It was mainly responsible for infiltrating the black majority ...
of the
Rhodesian Bush War The Rhodesian Bush War, also known as the Rhodesian Civil War, Second as well as the Zimbabwe War of Independence, was a civil conflict from July 1964 to December 1979 in the List of states with limited recognition, unrecognised country U.D.I. ...
. *
Insurgent An insurgency is a violent, armed rebellion by small, lightly armed bands who practice guerrilla warfare against a larger authority. The key descriptive feature of insurgency is its asymmetric nature: small irregular forces face a large, well ...
– An alternate term for a member of an irregular military that tends to refer to members of underground groups such as the Iraqi Insurgency, rather than larger rebel organizations like the
Revolutionary Armed Forces of Colombia The Revolutionary Armed Forces of Colombia – People's Army (, FARC–EP or FARC) was a Marxist–Leninist Guerrilla warfare, guerrilla group involved in the continuing Colombian conflict starting in 1964. The FARC-EP was officially founded in ...
. *
Fifth column A fifth column is a group of people who undermine a larger group or nation from within, usually in favor of an enemy group or another nation. The activities of a fifth column can be overt or clandestine. Forces gathered in secret can mobilize ...
- A group that carries out sabotage, disinformation, espionage, and/or terrorism within a group that responds to external enemies *
Bandit Banditry is a type of organized crime committed by outlaws typically involving the threat or use of violence. A person who engages in banditry is known as a bandit and primarily commits crimes such as extortion, robbery, kidnapping, and murder, e ...
- It is generally treated as an organized crime, but it has the character of a resistance movement depending on the political and social situation. *
Private army A private army (or private military) is a military force under the command of a private person or organization, rather than a nation or state. History Private armies may form when landowners arm household retainers for the protection of self and ...
- Combatants who owe their allegiance to a private person, group, or organization. *
Mercenary A mercenary is a private individual who joins an armed conflict for personal profit, is otherwise an outsider to the conflict, and is not a member of any other official military. Mercenaries fight for money or other forms of payment rather t ...
or "soldier of fortune" – Someone who is generally not a national in a standing army or not otherwise an inherently-invested party to an armed conflict who becomes involved in an armed conflict for monetary motives or for private gain. Mercenaries are often explicitly hired to fight or provide manpower or expertise in exchange for money; material wealth or, less commonly, political power. Mercenaries are often experienced combatants or former regular soldiers who decided to sell their combat experience, skill or manpower to interested parties or to the highest bidder in an armed conflict. Famous historic examples of "professional" or organized (often "career") mercenaries include the Italian ''
condottieri Condottieri (; singular: ''condottiero'' or ''condottiere'') were Italian military leaders active during the Middle Ages and the early modern period. The term originally referred specifically to commanders of mercenary companies, derived from the ...
'', or "contractors", leaders of "free agent" mercenary armies that provided their armies to the various
Italian city-states The Italian city-states were numerous political and independent territorial entities that existed in the Italian Peninsula from antiquity to the formation of the Kingdom of Italy in the late 19th century. The ancient Italian city-states were E ...
and the
Papal states The Papal States ( ; ; ), officially the State of the Church, were a conglomeration of territories on the Italian peninsula under the direct sovereign rule of the pope from 756 to 1870. They were among the major states of Italy from the 8th c ...
during the
Late Middle Ages The late Middle Ages or late medieval period was the Periodization, period of History of Europe, European history lasting from 1300 to 1500 AD. The late Middle Ages followed the High Middle Ages and preceded the onset of the early modern period ( ...
and
Renaissance Italy The Italian Renaissance ( ) was a period in History of Italy, Italian history between the 14th and 16th centuries. The period is known for the initial development of the broader Renaissance culture that spread across Western Europe and marked t ...
in exchange for profit, land or power. However, not all soldiers deemed to be "mercenaries" are "professional" or "career" mercenaries, and many mercenaries may be simply opportunists or persons with no prior combat experience. Whether a combatant is truly a "mercenary" may be a matter of controversy or degree, as financial and national interests often overlap, and most standing regular armies also provide their soldiers with some form of payment. Furthermore, as reflected in the
Geneva Convention upright=1.15, The original document in single pages, 1864 The Geneva Conventions are international humanitarian laws consisting of four treaties and three additional protocols that establish international legal standards for humanitarian t ...
, mercenaries are generally provided less protection under the rules of war than non-mercenaries, and many countries have criminalized "mercenary activity". Intense debates can build up over which term is to be used to refer to a specific group. Using one term over another can strongly imply strong support or opposition for the cause. It is possible for a military to cross the line between regular and irregular. Isolated regular army units that are forced to operate without regular support for long periods of time can degrade into irregulars. As an irregular military becomes more successful, it may transition away from irregular, even to the point of becoming the new regular army if it wins.


Regular military units that use irregular military tactics

Most conventional military officers and militaries are wary of using irregular military forces and see them as unreliable, of doubtful military usefulness, and prone to committing atrocities leading to retaliation in kind. Usually, such forces are raised outside the regular military like the British SOE during World War II and, more recently, the
CIA The Central Intelligence Agency (CIA; ) is a civilian foreign intelligence service of the federal government of the United States tasked with advancing national security through collecting and analyzing intelligence from around the world and ...
's
Special Activities Center The Special Activities Center (SAC) is the center of the United States Central Intelligence Agency responsible for covert operations. The unit was named Special Activities Division (SAD) prior to a 2015 reorganization. Within SAC there are at l ...
. However at times, such as out of desperation, conventional militaries will resort to guerilla tactics, usually to buy breathing space and time for themselves by tying up enemy forces to threaten their
line of communication A line of communication (or communications) is the route that connects an operating military unit with its supply base. Supplies and reinforcements are transported along the line of communication. Therefore, a secure and open line of communicat ...
s and rear areas, such as the 43rd Battalion Virginia Cavalry and the Chindits. Although they are part of a regular army, United States Special Forces are trained in missions such as implementing irregular military tactics. However, outside the United States, the term special forces does not generally imply a force that is trained to fight as guerillas and insurgents. Originally, the United States Special Forces were created to serve as a cadre around which
stay-behind A stay-behind operation is one where a country places secret operatives or organizations in its own territory, for use in case of a later enemy occupation. The stay-behind operatives would then form the basis of a resistance movement, and act as ...
resistance forces could be built in the event of a communist victory in Europe or elsewhere. The United States Special Forces and the CIA's
Special Activities Center The Special Activities Center (SAC) is the center of the United States Central Intelligence Agency responsible for covert operations. The unit was named Special Activities Division (SAD) prior to a 2015 reorganization. Within SAC there are at l ...
can trace their lineage to the OSS operators of World War II, which were tasked with inspiring, training, arming and leading resistance movements in German-occupied Europe and Japanese occupied Asia. In Finland, well-trained light infantry Sissi troops use irregular tactics such as reconnaissance, sabotage and
guerrilla warfare Guerrilla warfare is a form of unconventional warfare in which small groups of irregular military, such as rebels, partisans, paramilitary personnel or armed civilians, which may include recruited children, use ambushes, sabotage, terrori ...
behind enemy lines. The founder of the
People's Republic of China China, officially the People's Republic of China (PRC), is a country in East Asia. With population of China, a population exceeding 1.4 billion, it is the list of countries by population (United Nations), second-most populous country after ...
,
Mao Zedong Mao Zedong pronounced ; traditionally Romanization of Chinese, romanised as Mao Tse-tung. (26December 18939September 1976) was a Chinese politician, revolutionary, and political theorist who founded the People's Republic of China (PRC) in ...
actively advocated for the use of irregular military tactics by regular military units. In his book On Guerrilla Warfare, Mao described seven types of Guerilla units, and argues that "regular army units temporarily detailed for the purpose (of guerilla warfare)," "regular army units permanently detailed (for the purpose of guerilla warfare)," and bands of guerillas created "through a combination of a regular army unit and a unit recruited from the people" were all examples of ways in which regular military units could be involved in irregular warfare. Mao argues that regular army units temporarily detailed for irregular warfare are essential because "First, in mobile-warfare situations, the coordination of guerilla activities with regular operations is necessary. Second, until guerilla hostilities can be developed on a grand scale, there is no one to carry out guerilla missions but regulars." He also emphasizes the importance for the use of regular units permanently attached to guerilla warfare activities, stating that they can play key roles in severing enemy supply routes.


Effectiveness

While the morale, training and equipment of the individual irregular soldier can vary from very poor to excellent, irregulars are usually lacking the higher-level organizational training and equipment that is part of regular army. This usually makes irregulars ineffective in direct, main-line combat, the typical focus of more standard armed forces. Other things being equal, major battles between regulars and irregulars heavily favor the regulars. However, irregulars can excel at many other combat duties besides main-line combat, such as
scouting Scouting or the Scout Movement is a youth social movement, movement which became popularly established in the first decade of the twentieth century. It follows the Scout method of informal education with an emphasis on practical outdoor activi ...
,
skirmish Skirmishers are light infantry or light cavalry soldiers deployed as a vanguard, flank guard or rearguard to Screening (tactical), screen a tactical position or a larger body of friendly troops from enemy advances. They may be deployed in a sk ...
ing, harassing, pursuing, rear-guard actions, cutting supply,
sabotage Sabotage is a deliberate action aimed at weakening a polity, government, effort, or organization through subversion, obstruction, demoralization (warfare), demoralization, destabilization, divide and rule, division, social disruption, disrupti ...
, raids,
ambush An ambush is a surprise attack carried out by people lying in wait in a concealed position. The concealed position itself or the concealed person(s) may also be called an "". Ambushes as a basic military tactics, fighting tactic of soldi ...
es and
underground resistance Underground Resistance (commonly abbreviated to UR) are an American musical collective from Detroit, Michigan. Producing primarily Detroit techno since 1990 with a grungy four-track musical aesthetic, they are also renowned for their militant ...
. Experienced irregulars often surpass the regular army in these functions. By avoiding formal battles, irregulars have sometimes harassed high quality armies to destruction. The total effect of irregulars is often underestimated. Since the military actions of irregulars are often small and unofficial, they are underreported or even overlooked. Even when engaged by regular armies, some military histories exclude all irregulars when counting friendly troops, but include irregulars in the count of enemy troops, making the odds seem much worse than they were. This may be accidental; counts of friendly troops often came from official regular army rolls that exclude unofficial forces, while enemy strength often came from visual estimates, where the distinction between regular and irregular were lost. If irregular forces overwhelm regulars, records of the defeat are often lost in the resulting chaos.


History

By definition, "irregular" is understood in contrast to "regular armies", which grew slowly from personal bodyguards or elite militia. In
Ancient warfare Ancient warfare is war that was conducted from the beginning of recorded history to the end of the ancient period. The difference between prehistoric and ancient warfare is more organization oriented than technology oriented. The development of ...
, most civilized nations relied heavily on irregulars to augment their small regular army. Even in advanced civilizations, the irregulars commonly outnumbered the regular army. Sometimes entire tribal armies of irregulars were brought in from internal native or neighboring cultures, especially ones that still had an active hunting tradition to provide the basic training of irregulars. The regulars would only provide the core military in the major battles; irregulars would provide all other combat duties. Notable examples of regulars relying on irregulars include Bashi-bazouk units in the
Ottoman Empire The Ottoman Empire (), also called the Turkish Empire, was an empire, imperial realm that controlled much of Southeast Europe, West Asia, and North Africa from the 14th to early 20th centuries; it also controlled parts of southeastern Centr ...
, auxiliary cohorts of
Germanic peoples The Germanic peoples were tribal groups who lived in Northern Europe in Classical antiquity and the Early Middle Ages. In modern scholarship, they typically include not only the Roman-era ''Germani'' who lived in both ''Germania'' and parts of ...
in the
Roman Empire The Roman Empire ruled the Mediterranean and much of Europe, Western Asia and North Africa. The Roman people, Romans conquered most of this during the Roman Republic, Republic, and it was ruled by emperors following Octavian's assumption of ...
,
Cossacks The Cossacks are a predominantly East Slavic languages, East Slavic Eastern Christian people originating in the Pontic–Caspian steppe of eastern Ukraine and southern Russia. Cossacks played an important role in defending the southern borde ...
in the
Russian Empire The Russian Empire was an empire that spanned most of northern Eurasia from its establishment in November 1721 until the proclamation of the Russian Republic in September 1917. At its height in the late 19th century, it covered about , roughl ...
, and Native American forces in the
American frontier The American frontier, also known as the Old West, and popularly known as the Wild West, encompasses the Geography of the United States, geography, History of the United States, history, Folklore of the United States, folklore, and Cultur ...
of the
Confederate States of America The Confederate States of America (CSA), also known as the Confederate States (C.S.), the Confederacy, or Dixieland, was an List of historical unrecognized states and dependencies, unrecognized breakaway republic in the Southern United State ...
. One could attribute the disastrous defeat of the Romans at the
Battle of the Teutoburg Forest The Battle of the Teutoburg Forest, also called the Varus Disaster or Varian Disaster () by Ancient Rome, Roman historians, was a major battle fought between an alliance of Germanic peoples and the Roman Empire between September 8 and 11, 9&nbs ...
to the lack of supporting irregular forces; only a few squadrons of irregular light cavalry accompanied the invasion of Germany when normally the number of ''
foederati ''Foederati'' ( ; singular: ''foederatus'' ) were peoples and cities bound by a treaty, known as ''foedus'', with Rome. During the Roman Republic, the term identified the '' socii'', but during the Roman Empire, it was used to describe foreign ...
'' and
auxiliaries Auxiliaries are combat support, support personnel that assist the military or police but are organised differently from regular army, regular forces. Auxiliary may be military volunteers undertaking support functions or performing certain duties ...
would equal the regular legions. During this campaign the majority of locally recruited irregulars defected to the Germanic tribesmen led by the former auxiliary officer
Arminius Arminius (; 18/17 BC–AD 21) was a chieftain of the Germanic peoples, Germanic Cherusci tribe who is best known for commanding an alliance of Germanic tribes at the Battle of the Teutoburg Forest in AD 9, in which three Roman legions under th ...
. During the
decline of the Roman Empire The fall of the Western Roman Empire, also called the fall of the Roman Empire or the fall of Rome, was the loss of central political control in the Western Roman Empire, a process in which the Empire failed to enforce its rule, and its vast ...
, irregulars made up an ever-increasing proportion of the Roman military. At the end of the Western Empire, there was little difference between the Roman military and the barbarians across the borders. Following
Napoleon Napoleon Bonaparte (born Napoleone di Buonaparte; 15 August 1769 – 5 May 1821), later known by his regnal name Napoleon I, was a French general and statesman who rose to prominence during the French Revolution and led Military career ...
's modernisation of warfare with the invention of
conscription Conscription, also known as the draft in the United States and Israel, is the practice in which the compulsory enlistment in a national service, mainly a military service, is enforced by law. Conscription dates back to antiquity and it conti ...
, the
Peninsular War The Peninsular War (1808–1814) was fought in the Iberian Peninsula by Kingdom of Portugal, Portugal, Spain and the United Kingdom of Great Britain and Ireland, United Kingdom against the invading and occupying forces of the First French ...
led by Spaniards against the French invaders in 1808 provided the first modern example of
guerrilla warfare Guerrilla warfare is a form of unconventional warfare in which small groups of irregular military, such as rebels, partisans, paramilitary personnel or armed civilians, which may include recruited children, use ambushes, sabotage, terrori ...
. Indeed, the term of ''guerrilla'' itself was coined during this time. As the
Industrial Revolution The Industrial Revolution, sometimes divided into the First Industrial Revolution and Second Industrial Revolution, was a transitional period of the global economy toward more widespread, efficient and stable manufacturing processes, succee ...
dried up the traditional source of irregulars, nations were forced take over the duties of the irregulars using specially trained regular army units. Examples are the
light infantry Light infantry refers to certain types of lightly equipped infantry throughout history. They have a more mobile or fluid function than other types of infantry, such as heavy infantry or line infantry. Historically, light infantry often fought ...
in the
British Army The British Army is the principal Army, land warfare force of the United Kingdom. the British Army comprises 73,847 regular full-time personnel, 4,127 Brigade of Gurkhas, Gurkhas, 25,742 Army Reserve (United Kingdom), volunteer reserve perso ...
.


Irregular regiments in British India

Prior to 1857 Britain's
East India Company The East India Company (EIC) was an English, and later British, joint-stock company that was founded in 1600 and dissolved in 1874. It was formed to Indian Ocean trade, trade in the Indian Ocean region, initially with the East Indies (South A ...
maintained large numbers of cavalry and infantry regiments officially designated as "irregulars", although they were permanently established units. The end of Muslim rule saw a large number of unemployed Indian Muslim horsemen, who were employed in the army of the EIC. British officers such as Skinner, Gardner and Hearsay had become leaders of irregular cavalry that preserved the traditions of Mughal cavalry, which had a political purpose because it absorbed pockets of cavalrymen who might otherwise become disaffected plunderers. These were less formally drilled and had fewer British officers (sometimes only three or four per regiment) than the "regular" sepoys in British service. This system enabled the Indian officers to achieve greater responsibility than their counterparts in regular regiments. Promotion for both Indian and British officers was for efficiency and energy, rather than by seniority as elsewhere in the EIC's armies. In irregular cavalry the Indian troopers provided their horses under the '' silladar'' system. The result was a loose collection of regiments which in general were more effective in the field than their regular counterparts. These irregular units were also cheaper to raise and maintain and as a result many survived into the new Indian Army that was organized following the great Indian Rebellion of 1857.


Irregular military in Canada before 1867

Before 1867, military units in Canada consisted of British units of volunteers. During French rule, small local volunteer militia units or colonial militias were used to provide defence needs. During British control of various local militias, the
Provincial Marine The Provincial Marine or Marine Department was a coastal protection service in charge of the waters in the Great Lakes, the St. Lawrence River and parts of Lake Champlain under British control. While ships of the Provincial Marine were design ...
were used to support British regular forces in Canada.


Other instances of irregulars

Use of large irregular forces featured heavily in wars such as the
Three Kingdoms The Three Kingdoms of Cao Wei, Shu Han, and Eastern Wu dominated China from AD 220 to 280 following the end of the Han dynasty. This period was preceded by the Eastern Han dynasty and followed by the Jin dynasty (266–420), Western Jin dyna ...
period, the
American Revolution The American Revolution (1765–1783) was a colonial rebellion and war of independence in which the Thirteen Colonies broke from British America, British rule to form the United States of America. The revolution culminated in the American ...
, the
Irish War of Independence The Irish War of Independence (), also known as the Anglo-Irish War, was a guerrilla war fought in Ireland from 1919 to 1921 between the Irish Republican Army (1919–1922), Irish Republican Army (IRA, the army of the Irish Republic) and Unite ...
and
Irish Civil War The Irish Civil War (; 28 June 1922 – 24 May 1923) was a conflict that followed the Irish War of Independence and accompanied the establishment of the Irish Free State, an entity independent from the United Kingdom but within the British Emp ...
, the
Franco-Prussian War The Franco-Prussian War or Franco-German War, often referred to in France as the War of 1870, was a conflict between the Second French Empire and the North German Confederation led by the Kingdom of Prussia. Lasting from 19 July 1870 to 28 Janua ...
, the
Russian Civil War The Russian Civil War () was a multi-party civil war in the former Russian Empire sparked by the 1917 overthrowing of the Russian Provisional Government in the October Revolution, as many factions vied to determine Russia's political future. I ...
, the
Second Boer War The Second Boer War (, , 11 October 189931 May 1902), also known as the Boer War, Transvaal War, Anglo–Boer War, or South African War, was a conflict fought between the British Empire and the two Boer republics (the South African Republic and ...
, Liberation war of Bangladesh,
Vietnam War The Vietnam War (1 November 1955 – 30 April 1975) was an armed conflict in Vietnam, Laos, and Cambodia fought between North Vietnam (Democratic Republic of Vietnam) and South Vietnam (Republic of Vietnam) and their allies. North Vietnam w ...
, the Syrian Civil War and especially the Eastern Front of
World War II World War II or the Second World War (1 September 1939 – 2 September 1945) was a World war, global conflict between two coalitions: the Allies of World War II, Allies and the Axis powers. World War II by country, Nearly all of the wo ...
where hundreds of thousands of partisans fought on both sides. The Chinese
People's Liberation Army The People's Liberation Army (PLA) is the military of the Chinese Communist Party (CCP) and the People's Republic of China (PRC). It consists of four Military branch, services—People's Liberation Army Ground Force, Ground Force, People's ...
began as a peasant guerilla force which in time transformed itself into a large regular force. This transformation was foreseen in the doctrine of "
people's war People's war or protracted people's war is a Maoist military strategy. First developed by the Chinese communist revolutionary leader Mao Zedong (1893–1976), the basic concept behind people's war is to maintain the support of the population ...
", in which irregular forces were seen as being able to engage the enemy and to win the support of the populace but as being incapable of taking and holding ground against regular military forces.


Examples

* Arbegnoch - Guerrilla force in occupied Ethiopia 1936-44. *
Armatoloi The armatoles (; ; ; ), or armatole in singular, were irregular soldiers, or militia, commissioned by the Ottoman Empire, Ottomans to enforce the sultan's authority within an administrative district called an armatoliki ( in singular, , in plura ...
- Ottoman Greek irregulars * Armenian ''fedayi'' – Armenian irregular units of the 1880s–1920s * Atholl Highlanders – The only legal and still existing
private army A private army (or private military) is a military force under the command of a private person or organization, rather than a nation or state. History Private armies may form when landowners arm household retainers for the protection of self and ...
in Europe under the command of the Duke of Atholl in
Scotland Scotland is a Countries of the United Kingdom, country that is part of the United Kingdom. It contains nearly one-third of the United Kingdom's land area, consisting of the northern part of the island of Great Britain and more than 790 adjac ...
, United Kingdom, (1777–1783 and since 1839) * Bands - (Italian Army colonial and foreign irregulars) * Bargi - Maratha horsemen 1741-51. * Bashi-bazouk – Irregular mounted mercenary in the
Ottoman Empire The Ottoman Empire (), also called the Turkish Empire, was an empire, imperial realm that controlled much of Southeast Europe, West Asia, and North Africa from the 14th to early 20th centuries; it also controlled parts of southeastern Centr ...
*
Border ruffian Border ruffians were Proslavery thought, proslavery raiders who crossed into the Kansas Territory from Missouri during the mid-19th century to help ensure the territory entered the United States as a Slave states and free states, slave state. ...
/ Jayhawker * Bushwhackers – Irregular partisans who fought for the
South South is one of the cardinal directions or compass points. The direction is the opposite of north and is perpendicular to both west and east. Etymology The word ''south'' comes from Old English ''sūþ'', from earlier Proto-Germanic ''*sunþa ...
during the
American Civil War The American Civil War (April 12, 1861May 26, 1865; also known by Names of the American Civil War, other names) was a civil war in the United States between the Union (American Civil War), Union ("the North") and the Confederate States of A ...
. * Cacos - Haitian insurgent groups 19th and 20th centuries. *
Camisard Camisards were Huguenots (French Protestants) of the rugged and isolated Cévennes region and the neighbouring Vaunage in southern France. In the early 1700s, they raised a resistance against the persecutions which followed Louis XIV's Revocati ...
s –
Huguenot The Huguenots ( , ; ) are a Religious denomination, religious group of French people, French Protestants who held to the Reformed (Calvinist) tradition of Protestantism. The term, which may be derived from the name of a Swiss political leader, ...
insurgency in the beginning of the 18th century in the
Cévennes The Cévennes ( , ; ) is a cultural region and range of mountains in south-central France, on the south-east edge of the Massif Central. It covers parts of the '' départements'' of Ardèche, Gard, Hérault and Lozère. Rich in geographical, ...
* Cateran - Scottish clan warriors and marauders pre-18th century. * Çetes - Muslim irregulars Asia Minor 1910s-1920s * Cheta - armed bands resisting Ottoman rule in Macedonia, early 20th century. *
Chetniks The Chetniks,, ; formally the Chetnik Detachments of the Yugoslav Army, and also the Yugoslav Army in the Homeland; and informally colloquially the Ravna Gora Movement, was a Kingdom of Yugoslavia, Yugoslav royalist and Serbian nationalist m ...
- nationalist movement and guerrilla force in occupied Yugoslavia 1941-44. * Croats (military unit) - 17th century frontier light cavalry in Habsburgh service. * Dubat - indigenous auxiliaries in Italian Somaliand. *
Fano Fano () is a city and ''comune'' of the province of Pesaro and Urbino in the Marche region of Italy. It is a beach resort southeast of Pesaro, located where the ''Via Flaminia'' reaches the Adriatic Sea. It is the third city in the region by pop ...
- Ethiopian guerrilla force *
Fedayeen Fedayeen ( ''fidāʻiyyūn'' "self-sacrificers") is an Arabic language, Arabic term used to refer to various military groups willing to sacrifice themselves for a larger campaign. Etymology "Fidayun" is the plural of "fidayi" ( ''fidāʻiyy'' ...
- Arabic term for fighters willing to sacrifice themselves * Fellagha - nationalist militants in Algeria and Tunisia opposing French colonial rule 1950s. *
Filibuster (military) A filibuster (from the Spanish ''filibustero''), also known as a freebooter, is someone who engages in an unauthorized military expedition into a foreign country or territory to foster or support a political revolution or secession. The term is u ...
- participants in foreign military interventions without official backing. * Free Corps ''(Freikorps)'' – volunteer units in German-speaking countries, that existed from the 18th to the early 20th centuries as private armies * Free Swarm ''(Freischar)'' – volunteers, that participated in a conflict without the formal authorisation of one of the belligerents, but on the instigation of a political party or an individual * Goumiers – originally tribal allies supporting France in Algeria during the 19th century. From 1912 to 1956 Moroccan auxiliaries serving with the French Army. *
Hajduk A hajduk (, plural of ) is a type of Irregular military, irregular infantry found in Central Europe, Central, Eastern Europe, Eastern, and parts of Southeast Europe from the late 16th to mid 19th centuries, especially from Hajdú–Bihar Count ...
s— bandits and irregulars in and against the
Ottoman Empire The Ottoman Empire (), also called the Turkish Empire, was an empire, imperial realm that controlled much of Southeast Europe, West Asia, and North Africa from the 14th to early 20th centuries; it also controlled parts of southeastern Centr ...
, but found amongst military ranks in
Hungary Hungary is a landlocked country in Central Europe. Spanning much of the Pannonian Basin, Carpathian Basin, it is bordered by Slovakia to the north, Ukraine to the northeast, Romania to the east and southeast, Serbia to the south, Croatia and ...
and the
Polish–Lithuanian Commonwealth The Polish–Lithuanian Commonwealth, also referred to as Poland–Lithuania or the First Polish Republic (), was a federation, federative real union between the Crown of the Kingdom of Poland, Kingdom of Poland and the Grand Duchy of Lithuania ...
* Harkis – Algerian Muslim irregulars who served with the French Army during the
Algerian War The Algerian War (also known as the Algerian Revolution or the Algerian War of Independence) ''; '' (and sometimes in Algeria as the ''War of 1 November'') was an armed conflict between France and the Algerian National Liberation Front (Algeri ...
of 1954–62. * Haydamak - pro-Cossack paramilitary (18th century) * Honghuzi – Manchurian bandits who served as irregulars during the
Russo-Japanese War The Russo-Japanese War (8 February 1904 – 5 September 1905) was fought between the Russian Empire and the Empire of Japan over rival imperial ambitions in Manchuria and the Korean Empire. The major land battles of the war were fought on the ...
of 1904–1905. * Jagunço – armed hand in Northern Brazil. *
Kachaks Kachaks (, / ''kačaci'') is a term used for the Albanians, Albanian rebels active in the late 19th and early 20th century in northern Albania, Montenegro, Kosovo and Macedonia (region), Macedonia, and later as a term for the militias of Albania ...
- Albanian bandits and rebels (1880s–1930) *
Klepht Klephts (; Greek κλέφτης, ''kléftis'', pl. κλέφτες, ''kléftes'', which means "thieves" and perhaps originally meant just "brigand": "Other Greeks, taking to the mountains, became unofficial, self-appointed armatoles and were know ...
s – Greek guerrilla fighters in
Ottoman Greece The vast majority of the territory of present-day Greece was at some point incorporated within the Ottoman Empire. The period of Ottoman rule in Greece, lasting from the mid-15th century until the successful Greek War of Independence broke out ...
* Komitadji – rebel bands operating in the Balkans during the final period of the Ottoman Empire. *
Kuruc Kuruc (, plural ''kurucok''), also spelled kurutz, refers to a group of armed anti- Habsburg insurgents in the Kingdom of Hungary between 1671 and 1711. Over time, the term kuruc has come to designate Hungarians who advocate strict national inde ...
- Hungarian insurgent groups 17th-18th centuries. *
Kuva-yi Milliye The Kuva-yi Milliye (; 'National Forces' or 'Nationalist Forces') were irregular Turkish militia forces active in the early period of the Turkish War of Independence. These irregular forces emerged after the occupation of the parts of Turkey by t ...
- Ottoman/Turkish militia 1918-1921 * Land Storm (troops) ''(Landsturm)'' – created by a 21 April 1813 edict of
Frederick William III of Prussia Frederick William III (; 3 August 1770 – 7 June 1840) was King of Prussia from 16 November 1797 until his death in 1840. He was concurrently Elector of Brandenburg in the Holy Roman Empire until 6 August 1806, when the empire was dissolved ...
, lowest level of reserve troops in
Prussia Prussia (; ; Old Prussian: ''Prūsija'') was a Germans, German state centred on the North European Plain that originated from the 1525 secularization of the Prussia (region), Prussian part of the State of the Teutonic Order. For centuries, ...
,
Germany Germany, officially the Federal Republic of Germany, is a country in Central Europe. It lies between the Baltic Sea and the North Sea to the north and the Alps to the south. Its sixteen States of Germany, constituent states have a total popu ...
,
Austria-Hungary Austria-Hungary, also referred to as the Austro-Hungarian Empire, the Dual Monarchy or the Habsburg Monarchy, was a multi-national constitutional monarchy in Central Europe#Before World War I, Central Europe between 1867 and 1918. A military ...
,
Sweden Sweden, formally the Kingdom of Sweden, is a Nordic countries, Nordic country located on the Scandinavian Peninsula in Northern Europe. It borders Norway to the west and north, and Finland to the east. At , Sweden is the largest Nordic count ...
,
Switzerland Switzerland, officially the Swiss Confederation, is a landlocked country located in west-central Europe. It is bordered by Italy to the south, France to the west, Germany to the north, and Austria and Liechtenstein to the east. Switzerland ...
and the
Netherlands , Terminology of the Low Countries, informally Holland, is a country in Northwestern Europe, with Caribbean Netherlands, overseas territories in the Caribbean. It is the largest of the four constituent countries of the Kingdom of the Nether ...
* Legion of Frontiersmen – An irregular quasi-military organization that proliferated throughout the
British Empire The British Empire comprised the dominions, Crown colony, colonies, protectorates, League of Nations mandate, mandates, and other Dependent territory, territories ruled or administered by the United Kingdom and its predecessor states. It bega ...
prior to
World War I World War I or the First World War (28 July 1914 – 11 November 1918), also known as the Great War, was a World war, global conflict between two coalitions: the Allies of World War I, Allies (or Entente) and the Central Powers. Fighting to ...
* Macheteros de Jara - Paraguayan cavalry regiment of the
Chaco War The Chaco War (, Republiquetas * Requeté *
Makhnovshchina The Makhnovshchina (, ) was a Political movement#Mass movements, mass movement to establish anarchist communism in southern Ukraine, southern and eastern Ukraine during the Ukrainian War of Independence of 1917–1921. Named after Nestor Makhno, ...
– Ukrainian
anarchist Anarchism is a political philosophy and Political movement, movement that seeks to abolish all institutions that perpetuate authority, coercion, or Social hierarchy, hierarchy, primarily targeting the state (polity), state and capitalism. A ...
army that fought both the White Armies and the Bolsheviks during the
Russian Civil War The Russian Civil War () was a multi-party civil war in the former Russian Empire sparked by the 1917 overthrowing of the Russian Provisional Government in the October Revolution, as many factions vied to determine Russia's political future. I ...
. *
Minutemen Minutemen were members of the organized New England colonial militia companies trained in weaponry, tactics, and military strategies during the American Revolutionary War. They were known for being ready at a minute's notice, hence the name. Min ...
– American irregular troops during the American Revolution *
Morlachs Morlachs ( sh-Latn-Cyrl, Morlaci, Морлаци; ; ) is an exonym used for a rural Christian community in Herzegovina, Lika and the Dalmatian Hinterland. The term was initially used for a bilingual Vlach pastoralist community in the mountain ...
- Dalmatian auxiliaries in Venetian service during the 17th century. * People's Liberation Armed Forces of South Vietnam-
Viet Cong The Viet Cong (VC) was an epithet and umbrella term to refer to the communist-driven armed movement and united front organization in South Vietnam. It was formally organized as and led by the National Liberation Front of South Vietnam, and ...
's army * Pindari – 18th century irregular horsemen in
India India, officially the Republic of India, is a country in South Asia. It is the List of countries and dependencies by area, seventh-largest country by area; the List of countries by population (United Nations), most populous country since ...
* Rapparee - Irish guerillas (1690s) * Ragged Guards -
anti-communist Anti-communism is political and ideological opposition to communist beliefs, groups, and individuals. Organized anti-communism developed after the 1917 October Revolution in Russia, and it reached global dimensions during the Cold War, when th ...
and anti-trianon paramilitaries in the Regency, consisting of
Hungarians Hungarians, also known as Magyars, are an Ethnicity, ethnic group native to Hungary (), who share a common Culture of Hungary, culture, Hungarian language, language and History of Hungary, history. They also have a notable presence in former pa ...
and
muslim Muslims () are people who adhere to Islam, a Monotheism, monotheistic religion belonging to the Abrahamic religions, Abrahamic tradition. They consider the Quran, the foundational religious text of Islam, to be the verbatim word of the God ...
Bosnians Bosnians (Serbo-Croatian language, Serbo-Croatian: / ; / , / ) are people native to the country of Bosnia and Herzegovina, especially the region of Bosnia (region), Bosnia. The term ''Bosnian'' refers to all inhabitants/citizens of the coun ...
and
Albanians The Albanians are an ethnic group native to the Balkan Peninsula who share a common Albanian ancestry, Albanian culture, culture, Albanian history, history and Albanian language, language. They are the main ethnic group of Albania and Kosovo, ...
*
Righteous Army Righteous armies (), sometimes translated as irregular armies or militias, were informal civilian militias that appeared several times in Korean history, when the national armies were in need of assistance. The first righteous armies emerged d ...
— militias organised at several dates in Korean history *
Rough Riders The Rough Riders was a nickname given to the 1st United States Volunteer Cavalry, one of three such regiments raised in 1898 for the Spanish–American War and the only one to see combat. The United States Army was small, understaffed, and diso ...
– in the
Spanish–American War The Spanish–American War (April 21 – August 13, 1898) was fought between Restoration (Spain), Spain and the United States in 1898. It began with the sinking of the USS Maine (1889), USS ''Maine'' in Havana Harbor in Cuba, and resulted in the ...
* Ruga-Ruga - East African auxiliaries to German and British colonial armies. * Selbstschutz * Shifta – local militia in the Horn of Africa, *
Snapphane A ''snapphane'' was a member of a 17th-century pro- Danish guerrilla organization, auxiliaries or paramilitary troops that fought against the Swedes in the Second Northern and Scanian Wars, primarily in the eastern former Danish provinces that h ...
* Trenck's Pandurs
Habsburg monarchy The Habsburg monarchy, also known as Habsburg Empire, or Habsburg Realm (), was the collection of empires, kingdoms, duchies, counties and other polities (composite monarchy) that were ruled by the House of Habsburg. From the 18th century it is ...
17th and 18th century skirmisher, later evolving in the regular Grenz infantry. * Zapatistas - militant political movement active in southern Mexico from 1994. * Zeybeks - Ottoman irregulars (17th to 20th centuries)


Irregulars in today's warfare

Modern conflicts in post-invasion Iraq, the renewed Taliban insurgency in the 2001 war in Afghanistan, the Darfur conflict, the rebellion in the North of
Uganda Uganda, officially the Republic of Uganda, is a landlocked country in East Africa. It is bordered to the east by Kenya, to the north by South Sudan, to the west by the Democratic Republic of the Congo, to the south-west by Rwanda, and to the ...
by the
Lord's Resistance Army The Lord's Resistance Army (LRA) is a Christian extremist organization operating in Central Africa and East Africa. Its origins were in the War in Uganda (1986–1994), Ugandan insurgency (1986–1994) against Yoweri Museveni, during which Jo ...
, and the
Second Chechen War Names The Second Chechen War is also known as the Second Chechen Campaign () or the Second Russian Invasion of Chechnya from the Chechens, Chechen insurgents' point of view.Федеральный закон № 5-ФЗ от 12 января 19 ...
are fought almost entirely by irregular forces on one or both sides. The
CIA The Central Intelligence Agency (CIA; ) is a civilian foreign intelligence service of the federal government of the United States tasked with advancing national security through collecting and analyzing intelligence from around the world and ...
's
Special Activities Center The Special Activities Center (SAC) is the center of the United States Central Intelligence Agency responsible for covert operations. The unit was named Special Activities Division (SAD) prior to a 2015 reorganization. Within SAC there are at l ...
(SAC) is the premiere American
paramilitary A paramilitary is a military that is not a part of a country's official or legitimate armed forces. The Oxford English Dictionary traces the use of the term "paramilitary" as far back as 1934. Overview Though a paramilitary is, by definiti ...
clandestine unit for creating or combating irregular military forces. SAD paramilitary officers created and led successful units from the Hmong tribe during the
Laotian Civil War The Laotian Civil War was waged between the Communist Pathet Lao and the Royal Lao Government from 23 May 1959 to 2 December 1975. The Kingdom of Laos was a covert Theatre (warfare), theater during the Vietnam War with both sides receiving heavy ...
in the 1960s and 1970s. They also organized and led the Mujaheddin as an irregular force against the
Soviet Union The Union of Soviet Socialist Republics. (USSR), commonly known as the Soviet Union, was a List of former transcontinental countries#Since 1700, transcontinental country that spanned much of Eurasia from 1922 until Dissolution of the Soviet ...
in Afghanistan in the 1980s, as well as the
Northern Alliance The Northern Alliance ( ''Da Šumāl E'tilāf'' or ''Ettehād Šumāl''), officially known as the United National Front for the Salvation of Afghanistan ( ''Jabha-ye Muttahid-e barāye Afğānistān''), was a military alliance of groups that op ...
as an irregular insurgency force against the
Taliban , leader1_title = Supreme Leader of Afghanistan, Supreme leaders , leader1_name = {{indented plainlist, * Mullah Omar{{Natural Causes{{nbsp(1994–2013) * Akhtar Mansour{{Assassinated (2015–2016) * Hibatullah Akhundzada (2016–present) ...
with US Army Special Forces during the war in Afghanistan in 2001 and organized and led the Kurdish
Peshmerga The Peshmerga () are the internal security forces of Kurdistan Region. According to the Constitution of Iraq, regional governments are responsible for "the establishment and organization of the internal security forces for the region such as p ...
with US Army Special Forces as an irregular counter-insurgency force against the Kurdish Sunni Islamist group Ansar al-Islam at the Iraq-Iran border and as an irregular force against
Saddam Hussein Saddam Hussein (28 April 1937 – 30 December 2006) was an Iraqi politician and revolutionary who served as the fifth president of Iraq from 1979 until Saddam Hussein statue destruction, his overthrow in 2003 during the 2003 invasion of Ira ...
during the war in Iraq in 2003.Woodward, Bob ''Plan of Attack'', Simon & Schuster, 2004 Irregular civilian volunteers also played a large role in the Battle of Kyiv during the 2022 Russian Invasion of Ukraine.


See also

*
Asymmetric warfare Asymmetric warfare (or asymmetric engagement) is a type of war between belligerents whose relative military power, strategy or tactics differ significantly. This type of warfare often, but not necessarily, involves insurgents, terrorist grou ...
– Military theory that also includes regulars vs. irregulars *
Fourth generation warfare Fourth-generation warfare (4GW) is conflict characterized by a blurring of the distinction between war and politics, and of the distinction between combatants and civilians. It is placed as succeeding the third generation in the five-generation ...
* "Yank" Levy, teacher of the
Home Guard Home guard is a title given to various military organizations at various times, with the implication of an emergency or reserve force raised for local defense. The term "home guard" was first officially used in the American Civil War, starting ...
and coauthor of the first practical book on ''Guerrilla Warfare'' * Low intensity conflict *
Military volunteer A military volunteer (or ''war volunteer'') is a person who enlists in military service by free will, and is not a conscript, mercenary, or a foreign volunteers, foreign legionnaire. Volunteers sometimes enlist to fight Foreign volunteers, in th ...
*
Unconventional warfare Unconventional warfare (UW) is broadly defined as "military and quasi-military operations other than conventional warfare" and may use covert forces or actions such as subversion, diversion, sabotage, espionage, biowarfare, sanctions, propaga ...
*
Violent non-state actor In international relations, violent non-state actors (VNSAs), also known as non-state armed actors or non-state armed groups (NSAGs), are individuals or groups that are wholly or partly independent of governments and which threaten or use viole ...
s * Sissi (Finnish light infantry)


Legal aspects, categories

* Definition of terrorism *
Enemy combatant Enemy combatant is a term for a person who, either lawfully or unlawfully, engages in hostilities for the other side in an armed conflict, used by the U.S. government and media during the War on Terror. Usually enemy combatants are members of t ...
, US term used during the "War on Terror" *
Law of war The law of war is a component of international law that regulates the conditions for initiating war (''jus ad bellum'') and the conduct of hostilities (''jus in bello''). Laws of war define sovereignty and nationhood, states and territories, ...
*
Martens Clause The Martens Clause (International Phonetic Alphabet, pronounced ) is an early international law concept first introduced into the preamble of the 1899 Hague Conventions of 1899 and 1907, Hague Convention II – Laws and Customs of War on Land. ...
, stating that customary law applies where specific law is lacking in detail *
Unlawful combatant An unlawful combatant, illegal combatant, or unprivileged combatant/belligerent is a person who directly engages in armed conflict and is considered a terrorist and therefore is deemed not to be a lawful combatant protected by the Geneva Conven ...


References


Bibliography

* Flavius Vegetius Renatus
''Epitoma rei militaris''
* Dr. Thomas M. Huber
''Compound Warfare: An Anthology''
* Clifford J. Rogers

* John M. Gates

* Harold P. Ford

* Robert R. Mackey, "The UnCivil War: Irregular Warfare in the Upper South, 1861–1865", University of Oklahoma Press, 2004,


References


Further reading

*{{cite book , title=Encyclopedia of Guerrilla Warfare , type=Hardcover , first1=I. F. W. , last1=Beckett , location=Santa Barbara, California , publisher=Abc-Clio Inc , date=15 September 2009 , isbn=978-0874369298