
An army, ground force or land force is an armed force that fights primarily on
land
Land, also known as dry land, ground, or earth, is the solid terrestrial surface of Earth not submerged by the ocean or another body of water. It makes up 29.2% of Earth's surface and includes all continents and islands. Earth's land sur ...
. In the broadest sense, it is the land-based
military branch
Military branch (also service branch or armed service) is according to common standard a subdivision of the national armed forces of a sovereign nation or state.
Types of branches
Unified armed forces
The Canadian Armed Forces is the unifie ...
, service branch or armed service of a nation or country. It may also include aviation assets by possessing an
army aviation component. Within a national
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 ...
force, the word army may also mean a
field army
A field army (also known as numbered army or simply army) is a military formation in many armed forces, composed of two or more corps. It may be subordinate to an army group. Air army, Air armies are the equivalent formations in air forces, and ...
.
Definition
In some countries, such as
France
France, officially the French Republic, is a country located primarily in Western Europe. Overseas France, Its overseas regions and territories include French Guiana in South America, Saint Pierre and Miquelon in the Atlantic Ocean#North Atlan ...
and
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 ...
, the term "army", especially in its plural form "armies", has the broader meaning of
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 whole, while retaining the colloquial sense of land forces. To differentiate the colloquial army from the formal concept of military force, the term is qualified, for example in France the land force is called , meaning Land Army, and the air and space force is called , meaning Air and Space Army. The naval force, although not using the term "army", is also included in the broad sense of the term "armies" — thus the
French Navy
The French Navy (, , ), informally (, ), is the Navy, maritime arm of the French Armed Forces and one of the four military service branches of History of France, France. It is among the largest and most powerful List of navies, naval forces i ...
is an integral component of the collective French Armies (
French Armed Forces
The French Armed Forces (, ) are the military forces of France. They consist of four military branches – the Army, the Navy, the Air and Space Force, and the National Gendarmerie. The National Guard serves as the French Armed Forces' milita ...
) under the
Ministry of the Armies. A similar pattern is seen in China, with the
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 ...
(PLA) being the overall military, the land force being the
PLA Ground Force, and so forth for the
PLA Air Force, the
PLA Navy, and other branches.
Though by convention,
irregular military
Irregular military is any military 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, private armie ...
is understood in contrast to
regular armies which grew slowly from personal bodyguards or elite
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 ...
. Regular in this case refers to standardized doctrines, uniforms, organizations, etc. Regular military can also refer to full-time status (
standing army
A standing army is a permanent, often professional, army. It is composed of full-time soldiers who may be either career soldiers or conscripts. It differs from army reserves, who are enrolled for the long term, but activated only during wars ...
), versus
reserve or part-time personnel. Other distinctions may separate statutory forces (established under laws such as the
National Defence Act
The ''National Defence Act'' (NDA; ; ''LDN'') is an Act of the Parliament of Canada, which is the primary enabling legislation for organizing and funding the military of Canada. The Act created the Department of National Defence, which merged ...
), from de facto "non-statutory" forces such as some guerrilla and revolutionary armies.
Structure
Armies are always divided into various specialties, according to the mission, role, and training of individual units, and sometimes individual soldiers within a unit.
Some of the groupings common to all armies include the following:
*
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 ...
*
Armoured corps
An armoured corps (also mechanized corps or tank corps) is a specialized military organization whose role is to conduct armoured warfare. The units belonging to an armoured corps include military staff, and are equipped with tanks and other arm ...
*
Artillery corps
Artillery consists of ranged weapons that launch Ammunition, munitions far beyond the range and power of infantry firearms. Early artillery development focused on the ability to breach defensive walls and fortifications during sieges, and l ...
*
Signal corps
A signal corps is a military branch, responsible for military communications (''signals''). Many countries maintain a signal corps, which is typically subordinate to a country's army.
Military communication usually consists of radio, telephone, ...
*
Special forces
Special forces or special operations forces (SOF) are military units trained to conduct special operations. NATO has defined special operations as "military activities conducted by specially designated, organized, selected, trained and equip ...
*
Military police
Military police (MP) are law enforcement agencies connected with, or part of, the military of a state. Not to be confused with civilian police, who are legally part of the civilian populace. In wartime operations, the military police may supp ...
*
Medical corps
A medical corps is generally a military branch or staff corps, officer corps responsible for medical care for serving military personnel. Such officers are typically military physicians.
List of medical corps
The following organizations are exam ...
History
India
The
Battle of the Ten Kings
The Battle of the Ten Kings (, ) was first alluded to in the 7th Mandala of the Rigveda (RV) and took place between a king of the Bharatas named King Sudas versus a confederation of tribes. It resulted in a decisive victory for the Bharatas ...
, a
Hindu Aryan king named
Sudas defeated an alliance of ten kings and their supportive chieftains. During the
Iron Age
The Iron Age () is the final epoch of the three historical Metal Ages, after the Chalcolithic and Bronze Age. It has also been considered as the final age of the three-age division starting with prehistory (before recorded history) and progre ...
, the
Maurya
The Maurya Empire was a geographically extensive Iron Age historical power in South Asia with its power base in Magadha. Founded by Chandragupta Maurya around c. 320 BCE, it existed in loose-knit fashion until 185 BCE. The primary sourc ...
and
Nanda Empires had one of the largest armies in the world, the peak being approximately over 600,000 Infantry, 30,000 Cavalry, 8,000
War-Chariots and 9,000 War Elephants not including
tributary state
A tributary state is a pre-modern state in a particular type of subordinate relationship to a more powerful state which involved the sending of a regular token of submission, or tribute, to the superior power (the suzerain). This token often ...
allies. In the
Gupta age, large armies of
longbow
A longbow is a type of tall bow that makes a fairly long draw possible. Longbows for hunting and warfare have been made from many different woods in many cultures; in Europe they date from the Paleolithic era and, since the Bronze Age, were mad ...
men were recruited to fight off invading horse archer armies.
Elephants
Elephants are the Largest and heaviest animals, largest living land animals. Three living species are currently recognised: the African bush elephant (''Loxodonta africana''), the African forest elephant (''L. cyclotis''), and the Asian ele ...
,
pikemen, and
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 ...
were other featured troops.
China

The states of China raised armies for at least 1000 years before the
Spring and Autumn Annals
The ''Spring and Autumn Annals'' is an ancient Chinese chronicle that has been one of the core Chinese classics since ancient times. ''The Annals'' is the official chronicle of the State of Lu, and covers a 242-year period from 722 to 481&nbs ...
. By the
Warring States period
The Warring States period in history of China, Chinese history (221 BC) comprises the final two and a half centuries of the Zhou dynasty (256 BC), which were characterized by frequent warfare, bureaucratic and military reforms, and ...
, the crossbow had been perfected enough to become a military secret, with bronze bolts that could pierce any armor. Thus any political power of a state rested on the armies and their organization. China underwent political consolidation of the states of
Han (韓),
Wei (魏),
Chu (楚),
Yan (燕),
Zhao (趙) and
Qi (齊), until by 221 BCE,
Qin Shi Huang
Qin Shi Huang (, ; February 25912 July 210 BC), born Ying Zheng () or Zhao Zheng (), was the founder of the Qin dynasty and the first emperor of China. He is widely regarded as the first ever supreme leader of a unitary state, unitary d ...
(秦始皇帝), the first emperor of the
Qin dynasty
The Qin dynasty ( ) was the first Dynasties of China, imperial dynasty of China. It is named for its progenitor state of Qin, a fief of the confederal Zhou dynasty (256 BC). Beginning in 230 BC, the Qin under King Ying Zheng enga ...
, attained absolute power. This first emperor of China could command the creation of a
Terracotta Army
The Terracotta Army is a collection of terracotta sculptures depicting the armies of Qin Shi Huang, the first emperor of China. It is a form of funerary art buried with the emperor in 210–209 BCE with the purpose of protecting him in his aft ...
to guard his tomb in the city of
Xi'an
Xi'an is the list of capitals in China, capital of the Chinese province of Shaanxi. A sub-provincial city on the Guanzhong plain, the city is the third-most populous city in Western China after Chongqing and Chengdu, as well as the most populou ...
(西安). in addition to a realignment of the
Great Wall of China
The Great Wall of China (, literally "ten thousand ''li'' long wall") is a series of fortifications in China. They were built across the historical northern borders of ancient Chinese states and Imperial China as protection against vario ...
to strengthen his empire against insurrection, invasion and incursion.
Sun Tzu
Sun Tzu (; zh, t=孫子, s=孙子, first= t, p=Sūnzǐ) may have been a Chinese General, military general, strategist, philosopher, and writer who lived during the Eastern Zhou period (771–256 BC). Sun Tzu is traditionally credited as the au ...
's ''
The Art of War
''The Art of War'' is an ancient Chinese military treatise dating from the late Spring and Autumn period (roughly 5th century BC). The work, which is attributed to the ancient Chinese military strategist Sun Tzu ("Master Sun"), is compos ...
'' remains one of China's
Seven Military Classics, even though it is two thousand years old. Since no political figure could exist without an army, measures were taken to ensure only the most capable leaders could control the armies.
Civil bureaucracies (士大夫) arose to control the productive power of the states, and their military power.
Sparta
The
Spartan Army
The Spartan army was the principal ground force of Sparta. It stood at the center of the ancient Greek city-state, consisting of citizens trained in the disciplines and honor of a warrior society.Connolly (2006), p. 38 Subjected to military ...
was one of the earliest known professional armies. Boys were sent to a
barracks
Barracks are buildings used to accommodate military personnel and quasi-military personnel such as police. The English word originates from the 17th century via French and Italian from an old Spanish word 'soldier's tent', but today barracks ar ...
at the age of seven or eight to train for becoming a soldier. At the age of thirty, they were released from the barracks and allowed to marry and have a family. After that, men devoted their lives to war until their retirement at the age of 60. The Spartan Army was largely composed of
hoplite
Hoplites ( ) ( ) were citizen-soldiers of Ancient Greek city-states who were primarily armed with spears and shields. Hoplite soldiers used the phalanx formation to be effective in war with fewer soldiers. The formation discouraged the sold ...
s, equipped with arms and armor nearly identical to each other. Each hoplite bore the Spartan emblem and a scarlet uniform. The main pieces of this armor were a round shield, a spear and a helmet.
Ancient Rome

The
Roman Army
The Roman army () served ancient Rome and the Roman people, enduring through the Roman Kingdom (753–509 BC), the Roman Republic (509–27 BC), and the Roman Empire (27 BC–AD 1453), including the Western Roman Empire (collapsed Fall of the W ...
had its origins in the citizen army of the
Republic
A republic, based on the Latin phrase ''res publica'' ('public affair' or 'people's affair'), is a State (polity), state in which Power (social and political), political power rests with the public (people), typically through their Representat ...
, which was staffed by citizens serving mandatory duty for Rome. Conscription remained the main method through which Rome mustered forces until the end of the Republic. The army eventually became a professional organization largely of citizens, who would
served continuously for 25 years before being discharged.
The Romans were also noted for making use of
auxiliary troops, non-Romans who served with the
legions and filled roles that the traditional Roman military could not fill effectively, such as
light skirmish troops and
heavy cavalry
Heavy cavalry was a class of cavalry intended to deliver a battlefield charge and also to act as a Military reserve, tactical reserve; they are also often termed ''shock cavalry''. Although their equipment differed greatly depending on the re ...
. After their service in the army they were made citizens of Rome and then their children were citizens also. They were also given land and money to settle in Rome. In the
Late Roman Empire
In historiography, the Late or Later Roman Empire, traditionally covering the period from 284 CE to 641 CE, was a time of significant transformation in Roman governance, society, and religion. Diocletian's reforms, including the establishment of t ...
, these auxiliary troops, along with foreign mercenaries, became the core of the Roman Army; moreover, by the time of the Late Roman Empire tribes such as the
Visigoths
The Visigoths (; ) were a Germanic people united under the rule of a king and living within the Roman Empire during late antiquity. The Visigoths first appeared in the Balkans, as a Roman-allied Barbarian kingdoms, barbarian military group unite ...
were paid to serve as
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 ...
.
Medieval Europe

In the earliest
Middle Ages
In the history of Europe, the Middle Ages or medieval period lasted approximately from the 5th to the late 15th centuries, similarly to the post-classical period of global history. It began with the fall of the Western Roman Empire and ...
it was the obligation of every
aristocrat
The aristocracy (''from Greek'' ''ἀριστοκρατία'' ''aristokratía'', "rule of the best"; ''Latin: aristocratia'') is historically associated with a "hereditary" or a "ruling" social class. In many states, the aristocracy included the ...
to respond to the call to battle with his own equipment, archers, and infantry. This decentralized system was necessary due to the social order of the time, but could lead to motley forces with variable training, equipment and abilities. The more resources the noble had access to, the better his troops would be.
Initially, the words "knight" and "noble" were used interchangeably as there was not generally a distinction between them. While the nobility did fight upon horseback, they were also supported by lower class citizens – and mercenaries and criminals – whose only purpose was participating in warfare because, most often than not, they held brief employment during their lord's engagement. As the Middle Ages progressed and
feudalism
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 ...
developed in a legitimate social and economic system, knights started to develop into their own class with a minor caveat: they were still in debt to their lord. No longer primarily driven by economic need, the newly established vassal class were, instead, driven by fealty and
chivalry
Chivalry, or the chivalric language, is an informal and varying code of conduct that developed in Europe between 1170 and 1220. It is associated with the medieval Christianity, Christian institution of knighthood, with knights being members of ...
.
As central governments grew in power, a return to the citizen armies of the classical period also began, as central levies of the
peasantry
A peasant is a pre-industrial agricultural laborer or a farmer with limited land-ownership, especially one living in the Middle Ages under feudalism and paying rent, tax, fees, or services to a landlord. In Europe, three classes of peasan ...
began to be the central recruiting tool. England was one of the most centralized states in the Middle Ages, and the armies that fought in the
Hundred Years' War
The Hundred Years' War (; 1337–1453) was a conflict between the kingdoms of Kingdom of England, England and Kingdom of France, France and a civil war in France during the Late Middle Ages. It emerged from feudal disputes over the Duchy ...
were, predominantly, composed of paid professionals.
In theory, every Englishman had an obligation to serve for forty days. Forty days was not long enough for a campaign, especially one on the continent.
Thus the
scutage
Scutage was a medieval English tax levied on holders of a knight's fee under the feudal land tenure of knight-service. Under feudalism the king, through his vassals, provided land to knights for their support. The knights owed the king militar ...
was introduced, whereby most Englishmen paid to escape their service and this money was used to create a permanent army. However, almost all high medieval armies in Europe were composed of a great deal of paid core troops, and there was a large
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 ...
market in Europe from at least the early 12th century.
As the Middle Ages progressed in Italy, Italian cities began to rely mostly on mercenaries to do their fighting rather than the militias that had dominated the early and high medieval period in this region. These would be groups of career soldiers who would be paid a set rate. Mercenaries tended to be effective soldiers, especially in combination with standing forces, but in Italy they came to dominate the armies of the city states. This made them considerably less reliable than a standing army. Mercenary-on-mercenary warfare in Italy also led to relatively bloodless campaigns which relied as much on maneuver as on battles.
In 1439 the French legislature, known as the
Estates General (French: ''états généraux''), passed laws that restricted military recruitment and training to the king alone. There was a new tax to be raised known as the ''
taille
The ''taille'' () was a direct land tax on the French peasantry and non-nobles in ''Ancien Régime'' France. The tax was imposed on each household and was based on how much land it held, and was paid directly to the state.
History
Originally ...
'' that was to provide funding for a new Royal army. The mercenary companies were given a choice of either joining the Royal army as ''
compagnies d'ordonnance
The compagnie d'ordonnance was the first standing army of late medieval and early modern Kingdom of France, France. The system was the forefather of the modern company (military unit), company. Each ''compagnie'' consisted of 100 ''lances fourni ...
'' on a permanent basis, or being hunted down and destroyed if they refused. France gained a total standing army of around 6,000 men, which was sent out to gradually eliminate the remaining mercenaries who insisted on operating on their own. The new standing army had a more disciplined and professional approach to warfare than its predecessors. The reforms of the 1440s, eventually led to the
French victory at Castillon in 1453, and the conclusion of the
Hundred Years' War
The Hundred Years' War (; 1337–1453) was a conflict between the kingdoms of Kingdom of England, England and Kingdom of France, France and a civil war in France during the Late Middle Ages. It emerged from feudal disputes over the Duchy ...
. By 1450 the companies were divided into the field army, known as the ''grande ordonnance'' and the garrison force known as the ''petite ordonnance''.
Early modern

First
nation state
A nation state, or nation-state, is a political entity in which the State (polity), state (a centralized political organization ruling over a population within a territory) and the nation (a community based on a common identity) are (broadly ...
s lacked the funds needed to maintain standing forces, so they tended to hire
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 ...
to serve in their armies during wartime. Such mercenaries typically formed at the ends of periods of conflict, when men-at-arms were no longer needed by their respective governments.
The
veteran
A veteran () is a person who has significant experience (and is usually adept and esteemed) and expertise in an job, occupation or Craft, field.
A military veteran is a person who is no longer serving in the military, armed forces.
A topic o ...
soldiers thus looked for other forms of employment, often becoming mercenaries. Free Companies would often specialize in forms of combat that required longer periods of training that was not available in the form of a mobilized militia.
As late as the 1650s, most troops were mercenaries. However, after the 17th century, most states invested in better disciplined and more politically reliable permanent troops. For a time mercenaries became important as trainers and administrators, but soon these tasks were also taken by the state. The massive size of these armies required a large supporting force of administrators.
The newly centralized states were forced to set up vast organized bureaucracies to manage these armies, which some historians argue is the basis of the modern bureaucratic state. The combination of increased taxes and increased centralization of government functions caused a series of revolts across Europe such as the
Fronde
The Fronde () was a series of civil wars in the Kingdom of France between 1648 and 1653, occurring in the midst of the Franco-Spanish War, which had begun in 1635. The government of the young King Louis XIV confronted the combined opposition ...
in France and the
English Civil War
The English Civil War or Great Rebellion was a series of civil wars and political machinations between Cavaliers, Royalists and Roundhead, Parliamentarians in the Kingdom of England from 1642 to 1651. Part of the wider 1639 to 1653 Wars of th ...
.
In many countries, the resolution of this conflict was the rise of
absolute monarchy. Only in England and the Netherlands did representative government evolve as an alternative. From the late 17th century, states learned how to finance wars through long term low interest loans from national banking institutions. The first state to master this process was the
Dutch Republic
The United Provinces of the Netherlands, commonly referred to in historiography as the Dutch Republic, was a confederation that existed from 1579 until the Batavian Revolution in 1795. It was a predecessor state of the present-day Netherlands ...
. This transformation in the armies of Europe had great social impact. The defense of the state now rested on the commoners, not on the aristocrats. However, aristocrats continued to monopolize the officer corps of almost all early modern armies, including their high command. Moreover, popular revolts almost always failed unless they had the support and patronage of the noble or gentry classes. The new armies, because of their vast expense, were also dependent on taxation and the commercial classes who also began to demand a greater role in society. The great commercial powers of the Dutch and English matched much larger states in military might.
As any man could be quickly trained in the use of a musket, it became far easier to form massive armies. The inaccuracy of the weapons necessitated large groups of massed soldiers. This led to a rapid swelling of the size of armies. For the first time huge masses of the population could enter combat, rather than just the highly skilled professionals.
It has been argued that the drawing of men from across the nation into an organized corps helped breed national unity and patriotism, and during this period the modern notion of the
nation state
A nation state, or nation-state, is a political entity in which the State (polity), state (a centralized political organization ruling over a population within a territory) and the nation (a community based on a common identity) are (broadly ...
was born. However, this would only become apparent after the
French Revolutionary Wars
The French Revolutionary Wars () were a series of sweeping military conflicts resulting from the French Revolution that lasted from 1792 until 1802. They pitted French First Republic, France against Kingdom of Great Britain, Great Britain, Habsb ...
. At this time, the ''
levée en masse
''Levée en masse'' ( or, in English, ''mass levy'') is a French term used for a policy of mass national conscription, often in the face of invasion.
The concept originated during the French Revolutionary Wars, particularly for the period fo ...
'' and
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 ...
would become the defining paradigm of
modern warfare.
Before then, however, most national armies were in fact composed of many nationalities. In Spain armies were recruited from all the Spanish European territories including Spain, Italy,
Wallonia
Wallonia ( ; ; or ), officially the Walloon Region ( ; ), is one of the three communities, regions and language areas of Belgium, regions of Belgium—along with Flemish Region, Flanders and Brussels. Covering the southern portion of the c ...
(
Walloon Guards) and Germany. The French recruited some soldiers from Germany, Switzerland as well as from
Piedmont
Piedmont ( ; ; ) is one of the 20 regions of Italy, located in the northwest Italy, Northwest of the country. It borders the Liguria region to the south, the Lombardy and Emilia-Romagna regions to the east, and the Aosta Valley region to the ...
. Britain recruited
Hessian and
Hanovrian troops until the late 18th century. Irish Catholics made careers for themselves in the armies of many Catholic European states.
Prior to the
English Civil War
The English Civil War or Great Rebellion was a series of civil wars and political machinations between Cavaliers, Royalists and Roundhead, Parliamentarians in the Kingdom of England from 1642 to 1651. Part of the wider 1639 to 1653 Wars of th ...
in England, the monarch maintained a personal bodyguard of
Yeomen of the Guard
The King's Body Guard of the Yeomen of the Guard is a Sovereign's Bodyguard, bodyguard of the British monarch. The List of oldest military units and formations in continuous operation, oldest British military corps still in existence, it was ...
and the
Honourable Corps of Gentlemen at Arms
His Majesty's Body Guard of the Honourable Corps of Gentlemen at Arms is a bodyguard to the British Monarch. Until 17 March 1834, they were known as The Honourable Band of Gentlemen Pensioners.
Formation
The corps was formed as the Troop of Gen ...
, or "gentlemen pensioners", and a few locally raised companies to garrison important places such as
Berwick on Tweed or
Portsmouth
Portsmouth ( ) is a port city status in the United Kingdom, city and unitary authority in Hampshire, England. Most of Portsmouth is located on Portsea Island, off the south coast of England in the Solent, making Portsmouth the only city in En ...
(or
Calais
Calais ( , , traditionally , ) is a French port city in the Pas-de-Calais department, of which it is a subprefecture. Calais is the largest city in Pas-de-Calais. The population of the city proper is 67,544; that of the urban area is 144,6 ...
before it was
recaptured by France in 1558).
Troops for foreign expeditions were raised upon an ''ad hoc'' basis.
Noblemen
Nobility is a social class found in many societies that have an aristocracy. It is normally appointed by and ranked immediately below royalty. Nobility has often been an estate of the realm with many exclusive functions and characteristics. Th ...
and professional regular
soldier
A soldier is a person who is a member of an army. A soldier can be a Conscription, conscripted or volunteer Enlisted rank, enlisted person, a non-commissioned officer, a warrant officer, or an Officer (armed forces), officer.
Etymology
The wo ...
s were commissioned by the monarch to supply troops, raising their quotas by
indenture
An indenture is a legal contract that reflects an agreement between two parties. Although the term is most familiarly used to refer to a labor contract between an employer and a laborer with an indentured servant status, historically indentures we ...
from a variety of sources. On January 26, 1661
Charles II issued the Royal Warrant that created the genesis of what would become 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 ...
, although the
Scots Army and
English Army would remain two separate organizations until the
unification of England and Scotland in 1707. The small force was represented by only a few regiments.
After the
American Revolutionary War
The American Revolutionary War (April 19, 1775 – September 3, 1783), also known as the Revolutionary War or American War of Independence, was the armed conflict that comprised the final eight years of the broader American Revolution, in which Am ...
the
Continental Army
The Continental Army was the army of the United Colonies representing the Thirteen Colonies and later the United States during the American Revolutionary War. It was formed on June 14, 1775, by a resolution passed by the Second Continental Co ...
was quickly disbanded as part of the Americans' distrust of standing armies, and irregular state militias became the sole ground army of the United States, with the exception of one battery of artillery guarding
West Point
The United States Military Academy (USMA), commonly known as West Point, is a United States service academies, United States service academy in West Point, New York that educates cadets for service as Officer_(armed_forces)#United_States, comm ...
's arsenal. Then
First American Regiment
The First American Regiment (also known as Harmar's Regiment, The United States Regiment, The Regiment of Infantry, 1st Sub-legion, 1st Regiment of Infantry and 1st Infantry Regiment) was the first peacetime regular army infantry unit authorized ...
was established in 1784. However, because of continuing conflict with Native Americans in the United States, Native Americans, it was soon realized that it was necessary to field a trained standing army. The first of these, the Legion of the United States, was established in 1791.
Until 1733 the common soldiers of Prussian Army consisted largely of
peasantry
A peasant is a pre-industrial agricultural laborer or a farmer with limited land-ownership, especially one living in the Middle Ages under feudalism and paying rent, tax, fees, or services to a landlord. In Europe, three classes of peasan ...
recruited or impressed from Brandenburg–Prussia, leading many to flee to neighboring countries.
To halt this trend, Frederick William I of Prussia, Frederick William I divided Prussia into Cantonist (Prussia), regimental cantons. Every youth was required to serve as a soldier in these recruitment districts for three months each year; this met agrarian needs and added extra troops to bolster the regular ranks.

Russian tsars before Peter the Great, Peter I of Russia maintained professional hereditary musketeer corps (streltsy in Russian) that were highly unreliable and undisciplined. In times of war the armed forces were augmented by peasants. Peter I introduced a Imperial Russian Army, modern regular army built on German model, but with a new aspect: officers not necessarily from nobility, as talented commoners were given promotions that eventually included a noble title at the attainment of an officer's rank. Conscription of peasants and townspeople was based on quota system, per settlement. Initially it was based on the number of households, later it was based on the population numbers.
[Jerome Blum (1971) "Lord and Peasant in Russia from the Ninth to the Nineteenth Century", , pp. 465, 466] The term of service in the 18th century was for life. In 1793 it was reduced to 25 years. In 1834 it was reduced to 20 years plus 5 years in reserve and in 1855 to 12 years plus 3 years of reserve.
[
The first Ottoman Empire, Ottoman ]standing army
A standing army is a permanent, often professional, army. It is composed of full-time soldiers who may be either career soldiers or conscripts. It differs from army reserves, who are enrolled for the long term, but activated only during wars ...
were Janissaries. They replaced forces that mostly comprised tribal warriors (''Ghazw, ghazis'') whose loyalty and morale could not always be trusted. The first Janissary units were formed from prisoners of war and slaves, probably as a result of the sultan taking his traditional one-fifth share of his army's treasure they looted in kind rather than cash.
From the 1380s onwards, their ranks were filled under the ''devşirme'' system, where feudal dues were paid by service to the sultan. The "recruits" were mostly Christian youths, reminiscent of mamluks.
China organized the Manchu people into the Eight Banner system in the early 17th century. Defected Ming dynasty, Ming armies formed the Green Standard Army. These troops enlisted voluntarily and for long terms of service.
Late modern
Conscription allowed the French First Republic, French Republic to form the ''Grande Armée'', what Napoleon, Napoleon Bonaparte called "the nation in arms", which successfully battled European professional armies.
Conscription, particularly when the conscripts are being sent to foreign wars that do not directly affect the security of the nation, has historically been highly politically contentious in democracies.
In developed nations, the increasing emphasis on technological firepower and better-trained fighting forces, make mass conscription unlikely in the foreseeable future.
Russia, as well as many other nations, retains mainly a conscript army. There is also a very rare ''citizen army'' as used in Switzerland (see Military of Switzerland).
Field army
A particular army can be named or numbered to distinguish it from military land forces in general. For example, the First United States Army and the Army of Northern Virginia. 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 ...
it is normal to spell out the ordinal number of an army (e.g. First Army), whereas lower formations use figures (e.g. 1st Division).
Armies (as well as army groups and Theater (military), theaters) are large formations which vary significantly between armed forces in size, composition, and scope of responsibility.
In the Soviet Union, Soviet Red Army and the Soviet Air Force, "Armies" could vary in size, but were subordinate to an Army Group-sized "Front (Soviet Army), front" in wartime. In peacetime, a Army (Soviet Army), Soviet army was usually subordinate to a military district. Viktor Suvorov's ''Inside the Soviet Army'' describes how Cold War era Soviet military districts were actually composed of a front headquarters and a military district headquarters co-located for administration and Military deception, deception ('maskirovika') reasons.
Formations
In many countries, especially in Europe or North America, armies are often subdivided as follows:
See also
* Lists of armies
* List of armies by country
* List of army units called Guards
* List of numbered armies
* List of countries by number of military and paramilitary personnel
* Military organization
* Paramilitary
References
External links
*
{{Authority control
Armies,
Types of military forces