Irregular military

irregularirregularsirregular forcesirregular troopsmilitary irregularsirregular soldiersirregular forcemaquismilitary irregularirregular army
Irregular military is any non-standard military component that is distinct from a country's national armed forces.wikipedia
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Military

armed forcesdefensedefence
Irregular military is any non-standard military component that is distinct from a country's national armed forces.
There are various forms of irregular military forces, not belonging to a recognized state; though they share many attributes with regular military forces, they are less often referred to as simply "military".

Auxiliaries

auxiliaryauxiliary forceauxiliary troops
One could attribute the disastrous defeat of the Romans at the Battle of the Teutoburg Forest 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 and auxiliaries would equal the regular legions.
In the context of colonial armies locally recruited irregulars were often described as auxiliaries.

Paramilitary

paramilitariespara-militaryparamilitary organization
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 forces, are irregular.

Regular army

regularregularsregular troops
An irregular military organization is one which is not part of the regular army organization.

Guerrilla warfare

guerrillaguerrillasguerrilla war
Following Napoleon's modernisation of warfare with the invention of conscription, the Peninsular War led by Spaniards against the French invaders in 1808 provided the first modern example of guerrilla warfare.
Guerrilla warfare is a form of irregular warfare in which small groups of combatants, such as paramilitary personnel, armed civilians, or irregulars, use military tactics including ambushes, sabotage, raids, petty warfare, hit-and-run tactics, and mobility, to fight a larger and less-mobile traditional military.

Francs-tireurs

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Francs-tireurs (, French for "free shooters") was a term for irregular military applied to formations deployed by France during the early stages of the Franco-Prussian War (1870–71).

Partisan (military)

partisanpartisanspartisan rangers
Use of large irregular forces featured heavily in wars such as the American Revolution, the Irish War of Independence and Irish Civil War, the Franco-Prussian War, the Russian Civil War, the Second Boer War, Liberation war of Bangladesh, Vietnam War, and especially the Eastern Front of World War II where hundreds of thousands of partisans fought on both sides.
A partisan is a member of an irregular military force formed to oppose control of an area by a foreign power or by an army of occupation by some kind of insurgent activity.

Resistance movement

freedom fighterresistanceresistance fighter
Resistance movements can include any irregular armed force that rises up against an enforced or established authority, government, or administration.

Terrorism

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At length, after a terrible struggle, the [Directory] Troops prevailed over the Citizens ... To secure them further, they have a strong corps of irregulars, ready armed.

Bashi-bazouk

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Notable examples of regulars relying on irregulars include Bashi-bazouk units in the Ottoman Empire, auxiliary cohorts of Germanic peoples in the Roman Empire, Cossacks in the Russian Empire, and Native American forces in the American frontier of the Confederate States of America.
A bashi-bazouk ( başıbozuk, "one whose head is turned, damaged head, crazy-head", roughly "leaderless" or "disorderly") was an irregular soldier of the Ottoman army, raised in times of war.

Raid (military)

raidraidsraiding
However, irregulars can excel at many other combat duties besides main-line combat, such as scouting, skirmishing, harassing, pursuing, rear-guard actions, cutting supply, sabotage, raids, ambushes and underground resistance.
Raids are often a standard tactic in irregular warfare, employed by warriors, guerrilla fighters or other irregular military forces.

Law of war

laws of warjus in bellorules of war
These laws define both the permissive rights of states as well as prohibitions on their conduct when dealing with irregular forces and non-signatories.

Skirmisher

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However, irregulars can excel at many other combat duties besides main-line combat, such as scouting, skirmishing, harassing, pursuing, rear-guard actions, cutting supply, sabotage, raids, ambushes and underground resistance.
Light infantry, light cavalry, and irregular units often specialize in skirmishing.

Ambush

ambushesambuscadesneak attack
However, irregulars can excel at many other combat duties besides main-line combat, such as scouting, skirmishing, harassing, pursuing, rear-guard actions, cutting supply, sabotage, raids, ambushes and underground resistance.
In the 20th century, an ambush might involve thousands of soldiers on a large scale, such as over a choke point such as a mountain pass, or a small irregular band or insurgent group attacking a regular armed force patrol.

Irregular warfare

irregularirregular warguerilla campaign
Irregular warfare is warfare employing the tactics commonly used by irregular military organizations.

Light infantry

lightLight RoleLight infantry (militia)
Examples are the light infantry in the British Army.
Early regular armies of the modern era frequently relied on irregulars to perform the duties of light infantry skirmishers.

Armenian fedayi

Armenian militiafedayiArmenian irregular units
Fedayi (Western Ֆէտայի Fedayi; Eastern Ֆիդայի Fidayi), also known as the Armenian irregular units or Armenian militia, were Armenian civilians who voluntarily left their families to form self-defense units and irregular armed bands in reaction to the mass murder of Armenians and the pillage of Armenian villages by criminals, tribal Kurdish forces, and Hamidian guards during the reign of Abdul Hamid II in late 19th and early 20th centuries, known as the Hamidian massacres.

Bands (Italian Army irregulars)

bandaBande irregolariarmed irregular bands
Bands (Bande) was in Italian military term for irregular forces, composed normally of foreigners or natives, with some Italian officers and NCOs in command.

Freikorps

Free CorpsFreikorpdeath squad
Freikorps (, "Free Corps") were irregular German military volunteer units that existed from the 18th to the early 20th centuries, which effectively fought as mercenary or private armies, regardless of their own nationality.

Freischar

FreischärlerFree Swarm ''(Freischar)Freischaren
The Freischar was the German name given to an irregular, volunteer military unit that, unlike regular or reserve military forces, participated in a war without the formal authorisation of one of the belligerents, but on the instigation of a political party or an individual.

Hajduk

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A hajduk is a type of peasant irregular infantry found in Central and Southeast Europe from the early 17th to mid 19th centuries.

Filibuster (military)

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Filibusters are irregular soldiers who normally act without official authority from their own government, and are generally motivated by financial gain, political ideology, or the thrill of adventure.

Croats (military unit)

CroatCroatsCroat (Crabat)
The Croats were initially irregular units loosely organized in bands.

Unconventional warfare

unconventionalunconventional operationsunconventional tactics
Although they are part of a regular army, United States Special Forces are trained in missions such as implementing irregular military tactics.

Unlawful combatant

unlawful combatantsunlawful enemy combatantsunlawful enemy combatant