Roman legion

See List of Roman legions for a catalogue of known late republic, early Empire and late Empire legions, with dates in existence, emblem and locations of deployment.

A Roman legion (from Latin legio "military levy, conscription", from legere "to choose") was the largest unit of the Roman army involving from 3000 men in early times to over 5200 men in imperial times, consisting of centuries as the basic units. Until the middle of the first century, 10 cohorts (about 5,000 men) made up a Roman Legion. This was later changed to nine cohorts of standard size (with 6 centuries at 80 men each) and one cohort, the first cohort, of double strength (5 double-strength centuries with 160 men each).

In the early Roman Kingdom the "legion" may have meant the entire Roman army but sources on this period are few and unreliable.[1] The subsequent organization of legions varied greatly over time but legions were typically composed of around five thousand soldiers, divided during the republican era into three lines of ten maniples, and from about 100 BC into ten cohorts. Legions also included a small ala or cavalry unit. By the third century AD, the legion was a much smaller unit of about 1,000 to 1,500 men, and there were more of them. In the fourth century AD, East Roman border guard legions (limitanei) may have become even smaller.

For most of the Roman Imperial period, the legions formed the Roman army's elite heavy infantry, recruited exclusively from Roman citizens, while the remainder of the army consisted of auxiliaries, who provided additional infantry and the vast majority of the Roman army's cavalry. (Provincials who aspired to citizenship gained it when honourably discharged from the auxiliaries). The Roman army, for most of the Imperial period, consisted mostly of auxiliaries rather than legions.[2]

Many of the legions founded before 40 BC were still active until at least the fifth century, notably Legio V Macedonica, which was founded by Augustus in 43 BC and was in Egypt in the seventh century during the Islamic conquest of Egypt.

Overview of typical organization & strength

Imperial Roman legionaries in tight formation, a relief from Glanum, a Roman town in what is now southern France that was inhabited from 27 BC to 260 AD (when it was sacked by invading Alemanni)

Because legions were not permanent units until the Marian reforms (c. 107 BC), and were instead created, used, and disbanded again, several hundred legions were named and numbered throughout Roman history. To date, about 50 have been identified. The Republican Legions were composed of levied men that paid for their own equipment and thus the structure of the Roman army at this time reflected the society, and at any time there would be four Consular Legions (with command divided between the two ruling Consuls) and in time of war extra Legions could be levied. Toward the end of the 2nd Century BC, Rome started to experience manpower shortages brought about by property and financial qualifications to join the army. This prompted Consul Gaius Marius to remove property qualifications and decree that all citizens, regardless of their wealth or social class, were made eligible for service in the Roman army with equipment and rewards for fulfilling years of service provided by the state. The Roman army became a volunteer, professional and standing army which extended service beyond Roman citizens but also to non-citizens that could sign on as auxillia (Auxiliaries) and were rewarded Roman citizenship upon completion of service and all the rights and privileges that entailed. In the time of Augustus, there were nearly 50 upon his succession but this was reduced to about 25–35 permanent standing legions and this remained the figure for most of the Empire's history.

A legion consisted of several cohorts of heavy infantry known as legionaries. It was almost always accompanied by one or more attached units of auxiliaries, who were not Roman citizens and provided cavalry, ranged troops and skirmishers to complement the legion's heavy infantry. The recruitment of non-citizens was rare but appears to have occurred in times of great need; For example, Caesar appears to have recruited the Legio V Alaudae mostly from non-citizen Gauls.

The size of a typical legion varied throughout the history of ancient Rome, with complements of 4,200 legionaries and 300 equites (drawn from the wealthier classes – in early Rome all troops provided their own equipment) in the republican period of Rome, (the infantry were split into 10 cohorts each of four maniples of 120 legionaries), to 5,200 men plus 120 auxiliaries in the imperial period (split into 10 cohorts, nine of 480 men each, plus the first cohort holding 800 men).

History

Roman kings (to c.500 BC)

Main article: Early Roman army

In the period before the raising of the legio and the early years of the Roman Kingdom and the Republic, forces are described as being organized into centuries of roughly one hundred men. These centuries were grouped together as required and answered to the leader who had hired or raised them. Such independent organization persisted until the 2nd century BC amongst light infantry and cavalry, but was discarded completely in later periods with the supporting role taken instead by allied troops. The roles of century leader (later formalised as a centurion), second in command and standard bearer are referenced in this early period.

Much Roman history of the era is shrouded in legend, but it is believed that during the reign of Servius Tullius, the census (from Latin: censeō – accounting of the people) was introduced. With this all Roman able-bodied, property-owning male citizens were divided into five classes for military service based on their wealth and then organised into centuries as sub-units of the greater Roman army or legio (multitude). Joining the army was both a duty and a distinguishing mark of Roman citizenship; during the entire pre-Marian period the wealthiest land owners performed the most years of military service. These individuals would have had the most to lose should the state have fallen.

The first and wealthiest common class was armed in the fashion of the hoplite with spear, sword, helmet, breast plate and round shield (called clipeus in Latin, similar to the Greek aspis, also called hoplon); there were 82 centuries of these of which two were trumpeters. Roman soldiers had to purchase their own equipment. The second and third class also acted as spearmen but were less heavily armoured and carried a larger oval or rectangular shield. The fourth class could afford no armour; perhaps bearing a small shield and armed with spear and javelin. All three of the latter classes made up about 26 centuries. The fifth and final class was composed only of slingers. There were 32 centuries raised from this class, two of which were designated engineers. The army officers as well as the cavalry were drawn from leading citizens who enrolled as equestrians (equites). The equites were later placed in smaller groups of 30 that were commanded by decurions (which means commander of ten). There were 18 centuries of equites.

Until the 4th century BC, the massive Greek phalanx was the mode of battle. Roman soldiers would have thus looked much like Greek hoplites. Tactics were no different from those of the early Greeks and battles were joined on flat terrain. Spearmen would deploy in tightly packed rows to form a shield wall with their spears pointing forwards. They charged the enemy supported by javelin throwers and slingers; the cavalry pursued the enemy, sometimes dismounting to support infantry in dire situations. The phalanx was a cumbersome military unit to manoeuvre and was easily defeated by mountain tribes, such as the Volsci or Samnites, in rough terrain.

Early civilian authorities called praetors doubled as military leaders during the summer war season. A declaration of war included a religious ceremony ending with the throwing of a ceremonial javelin into the enemy's territory to mark the start of hostilities.

Roman Republic (509–107 BC)

At some point, possibly in the beginning of the Roman Republic after the kings were overthrown, the legio was subdivided into two separate legions, each one ascribed to one of the two consuls. In the first years of the Republic, when warfare was mostly concentrated on raiding, it is uncertain if the full manpower of the legions was summoned at any one time. In 494 BC, when three foreign threats emerged, the dictator Manius Valerius Maximus raised ten legions which Livy says was a greater number than had been raised previously at any one time.[3]

Also, some warfare was still conducted by Roman forces outside the legionary structure, the most famous example being the campaign in 479 BC by the clan army of gens Fabia against the Etruscan city of Veii (in which the clan was annihilated). Legions became more formally organized in the 4th century BC, as Roman warfare evolved to more frequent and planned operations, and the consular army was raised to two legions each.

In the Republic, legions had an ephemeral existence. Except for Legio I to IV, which were the consular armies (two per consul), other units were levied by campaign. Rome's Italian allies were required to provide approximately ten cohorts (auxilia were not organized into legions) to support each Roman Legion.

In the middle of the Republic, legions were composed of the following units:

Each of these three lines was subdivided into (usually 10) chief tactical units called maniples. A maniple consisted of two centuries and was commanded by the senior of the two centurions. At this time, each century of hastati and principes consisted of 60 men; a century of triarii was 30 men. These 3,000 men (twenty maniples of 120 men, and ten maniples of 60 men), together with about 1,200 velites and 300 cavalry gave the mid Republican ("manipular") legion a nominal strength of about 4,500 men.

Late Republic (107–30 BC)

Visual representation of the post Marian Reform Legion showing size and disposition for Infantry formations

See also List of Roman legions for details of notable late Republican legions
See also Sub-Units of the Roman legion

The Marian reforms (of Gaius Marius) enlarged the centuries to 80 men, and grouped them into six-century "cohorts" (rather than two-century maniples). Each century had its own standard and was made up of ten units (contubernia) of eight men who shared a tent, a millstone, a mule and cooking pot.

Following the reforms of the general Marius in the 2nd century BC, the legions took on the second, narrower meaning that is familiar in the popular imagination as close-order citizen heavy infantry.

At the end of the 2nd century BC, Gaius Marius reformed the previously ephemeral legions as a professional force drawing from the poorest classes, enabling Rome to field larger armies and providing employment for jobless citizens of the city of Rome. However, this put the loyalty of the soldiers in the hands of their general rather than the State of Rome itself. This development ultimately enabled Julius Caesar to cross the Rubicon with an army loyal to him personally and effectively end the Republic.

The legions of the late Republic and early Empire are often called Marian legions. Following the Battle of Vercellae in 101 BC, Marius granted all Italian soldiers Roman citizenship. He justified this action to the Senate by saying that in the din of battle he could not distinguish Roman from ally. This effectively eliminated the notion of allied legions; henceforth all Italian legions would be regarded as Roman legions, and full Roman citizenship was open to all the regions of Italy. At the same time, the three different types of heavy infantry were replaced by a single, standard type based on the Principes: armed with two heavy javelins called pila (singular pilum), the short sword called gladius, chain mail (lorica hamata), helmet and rectangular shield (scutum).

The role of allied legions would eventually be taken up by contingents of allied auxiliary troops, called Auxilia. Auxilia contained specialist units, engineers and pioneers, artillerymen and craftsmen, service and support personnel and irregular units made up of non-citizens, mercenaries and local militia. These were usually formed into complete units such as light cavalry, light infantry or velites, and labourers. There was also a reconnaissance squad of 10 or more light mounted infantry called speculatores who could also serve as messengers or even as an early form of military intelligence service.

As part of the Marian reforms, the legions' internal organization was standardized. Each legion was divided into cohorts. Prior to this, cohorts had been temporary administrative units or tactical task forces of several maniples, even more transitory than the legions themselves. Now the cohorts were ten permanent units, composed of 6 centuries and in the case of the first cohort 12 centuries each led by a centurion assisted by an optio. The cohorts came to form the basic tactical unit of the legions. Ranking within the legion was based on length of service, with the senior Centurion commanding the first century of the first cohort; he was called the primus pilus (First Spear), and reported directly to the superior officers (legates and tribuni). All career soldiers could be promoted to the higher ranks in recognition of exceptional acts of bravery or valour. A newly promoted junior Centurion would be assigned to the sixth century of the tenth cohort and slowly progressed through the ranks from there.

Every legion had a large baggage train, which included 640 mules (1 mule for every 8 legionaries) just for the soldiers' equipment. To keep these baggage trains from becoming too large and slow, Marius had each infantryman carry as much of his own equipment as he could, including his own armour, weapons and 15 days' rations, for about 25–30 kg (50–60 pounds) of load total. To make this easier, he issued each legionary a cross stick to carry their loads on their shoulders. The soldiers were nicknamed Marius' Mules because of the amount of gear they had to carry themselves. This arrangement allowed for the possibility for the supply train to become temporarily detached from the main body of the legion, thus greatly increasing the army's speed when needed.

A typical legion of this period had 5,120 legionaries as well as a large number of camp followers, servants and slaves. Legions could contain as many as 6,000 fighting men when including the auxiliaries, although much later in Roman history the number was reduced to 1,040 to allow for greater mobility. Numbers would also vary depending on casualties suffered during a campaign; Julius Caesar's legions during his campaign in Gaul often only had around 3,500 men.

Tactics were not very different from the past, but their effectiveness was largely improved because of the professional training of the soldiers.

A re-enactor as a Roman centurion, c. 70.
A re-enactor, showing a Roman miles, (2nd century).

After the Marian reforms, and throughout the history of Rome's Late Republic, the legions played an important political role. By the 1st century BC, the threat of the legions under a demagogue was recognized. Governors were not allowed to leave their provinces with their legions. When Julius Caesar broke this rule, leaving his province of Gaul and crossing the Rubicon into Italy, he precipitated a constitutional crisis. This crisis and the civil wars which followed brought an end to the Republic and led to the foundation of the Empire under Augustus in 27 BC.

The Roman empire under Hadrian (ruled 117–38), showing the legions deployed in 125

Early Empire (27 BC–AD 200)

Main article: Imperial Roman army

See List of Roman legions of the early Empire
See also Sub-Units of the Roman legion

Generals, during the recent Republican civil wars, had formed their own legions and numbered them as they wished. During this time, there was a high incidence of Gemina (twin) legions, where two legions were consolidated into a single organization (and was later made official and put under a legatus and six duces). At the end of the civil war against Mark Antony, Augustus was left with around fifty legions, with several double counts (multiple Legio Xs for instance). For political and economic reasons, Augustus reduced the number of legions to 28 (which diminished to 25 after the Battle of Teutoburg Forest, in which 3 legions were completely destroyed by the Germanics).

Beside streamlining the army, Augustus also regulated the soldiers' pay. At the same time, he greatly increased the number of auxiliaries to the point where they were equal in number to the legionaries. He also created the Praetorian Guard along with a permanent navy where served the liberti, or freed slaves. The legions also became permanent at this time, and not recruited for particular campaigns. They were also allocated to static bases with permanent castra legionaria (legionary fortresses).

Augustus' military policies proved sound and cost effective, and were generally followed by his successors. These emperors would carefully add new legions, as circumstances required or permitted, until the strength of the standing army stood at around 30 legions (hence the wry remark of the philosopher Favorinus that It is ill arguing with the master of 30 legions). With each legion having 5,120 legionaries usually supported by an equal number of auxiliary troops, the total force available to a legion commander during the Pax Romana probably ranged from 11,000 downwards, with the more prestigious legions and those stationed on hostile borders or in restive provinces tending to have more auxiliaries. Some legions may have even been reinforced at times with units making the associated force near 15,000–16,000 or about the size of a modern division.

Throughout the imperial era, the legions played an important political role. Their actions could secure the empire for a usurper or take it away. For example, the defeat of Vitellius in the Year of the Four Emperors was decided when the Danubian legions chose to support Vespasian.

In the empire, the legion was standardized, with symbols and an individual history where men were proud to serve. The legion was commanded by a legatus or legate. Aged around thirty, he would usually be a senator on a three-year appointment. Immediately subordinate to the legate would be six elected military tribunes — five would be staff officers and the remaining one would be a noble heading for the Senate (originally this tribune commanded the legion). There would also be a group of officers for the medical staff, the engineers, record-keepers, the praefectus castrorum (commander of the camp) and other specialists such as priests and musicians.

Late Empire (from 200 AD)

Main article: Late Roman army
A re-enactor, portraying a legionary at the end of the 3rd century
Map of Roman legions by 212 AD.[5]

In the Later Roman Empire, the number of legions was increased and the Roman Army expanded. There is no evidence to suggest that legions changed in form before the Tetrarchy, although there is evidence that they were smaller than the paper strengths usually quoted. The final form of the legion originated with the elite legiones palatinae created by Diocletian and the Tetrarchs. These were infantry units of around 1,000 men rather than the 5,000, including cavalry, of the old Legions. The earliest legiones palatinae were the Lanciarii, Joviani, Herculiani and Divitenses.

The 4th century saw a very large number of new, small legions created, a process which began under Constantine II. In addition to the elite palatini, other legions called comitatenses and pseudocomitatenses, along with the auxilia palatina, provided the infantry of late Roman armies. The Notitia Dignitatum lists 25 legiones palatinae, 70 legiones comitatenses, 47 legiones pseudocomitatenses and 111 auxilia palatina in the field armies, and a further 47 legiones in the frontier armies.[6] Legion names such as Honoriani and Gratianenses found in the Notitia suggest that the process of creating new legions continued through the 4th century rather than being a single event. The names also suggest that many new legions were formed from vexillationes or from old legions. In addition, there were 24 vexillationes palatini, 73 vexillationes comitatenses; 305 other units in the Eastern limitanei and 181 in the Western limitanei.[7]

According to the late Roman writer Vegetius' De Re Militari, each century had a ballista and each cohort had an onager, giving the legion a formidable siege train of 59 Ballistae and 10 Onagers, each manned by 10 libritors (artillerymen) and mounted on wagons drawn by oxen or mules. In addition to attacking cities and fortifications, these would be used to help defend Roman forts and fortified camps (castra) as well. They would even be employed on occasion, especially in the later Empire, as field artillery during battles or in support of river crossings.

Despite a number of reforms, the Legion system survived the fall of the Western Roman Empire, and was continued in the Eastern Roman Empire until around 7th century, when reforms begun by Emperor Heraclius to counter the increasing need for soldiers around the Empire resulted in the Theme system. Despite this, the Eastern Roman/Byzantine armies continued to be influenced by the earlier Roman legions, and were maintained with similar level of discipline, strategic prowess, and organization.

Legionary ranks

Aside from the rank and file legionary (who received the base wage of 10 asses a day or 225 denarii a year), the following list describes the system of officers which developed within the legions from the Marian reforms (104 BC) until the military reforms of Diocletian (c. 290).

Senior officers

Centurions

The rank of centurion was an officer grade that included many ranks, meaning centurions had very good prospects for promotion. The most senior centurion in a legion was known as the primus pilus (first file or spear), who directly commanded the first century of the first cohort and commanded the whole first cohort when in battle. Within the second to tenth cohorts, the commander of each cohort's first century was known as a pilus prior and was in command of his entire cohort when in battle. The seniority of the pilus prior centurions was followed by the five other century commanders of the first cohort, who were known as primi ordines.

A historical reenactor in Roman centurion costume

In modern military terms, an ordinary centurion was approximately equivalent to a Warrant Officer that had a junior officer's commission, whereas the most senior centurion was closer to the equivalent to the rank of a full Captain.

The equestrian, or military tribunes held positions equivalent to the rank of Major, while the Senatorial Tribune and the Camp Prefect were the equivalent of a Lt. Colonel.

The Legion Legate was the equivalent of full Brigadier with the Imperial Legate holding the rank of General.

The six centuries of a normal cohort, were, in order of precedence:

The centuries took their titles from the old use of the legion drawn up in three lines of battle using three classes of soldier. (Each century would then hold a cross-section of this theoretical line, although these century titles were now essentially nominal.) Each of the three lines is then sub-divided within the century into a more forward and a more rear century.

Lower ranks

Special duty posts

Pay

From the time of Gaius Marius onwards, legionaries received 225 denarii a year (equal to 900 Sestertii); this basic rate remained unchanged until Domitian, who increased it to 300 denarii. In spite of the steady inflation during the 2nd century, there was no further rise until the time of Septimius Severus, who increased it to 500 denarii a year. However, the soldiers did not receive all the money in cash, as the state deducted a clothing and food tax from their pay. To this wage, a legionary on active campaign would hope to add the booty of war, from the bodies of their enemies and as plunder from enemy settlements. Slaves could also be claimed from the prisoners of war and divided amongst the legion for later sale, which would bring in a sizeable supplement to their regular pay.

All legionary soldiers would also receive a praemia on the completion of their term of service: a sizeable sum of money (3,000 denarii from the time of Augustus) and/or a plot of good farmland (good land was in much demand); farmland given to veterans often helped in establishing control of the frontier regions and over rebellious provinces. Later, under Caracalla, the praemia increased to 5,000 denarii.

Symbols

From 104 BC onwards, each legion used an aquila (eagle) as its standard symbol. The symbol was carried by an officer known as aquilifer, and its loss was considered to be a very serious embarrassment, and often led to the disbanding of the legion itself. Normally, this was because any legion incapable of regaining its eagle in battle was so severely mauled that it was no longer effective in combat.

Reenacters portraying Roman legionaries of Legio XV Apollinaris.

In Gallic War (Bk IV, Para. 25), Julius Caesar describes an incident at the start of his first invasion of Britain in 55 BC that illustrated how fear for the safety of the eagle could drive Roman soldiers. When Caesar's troops hesitated to leave their ships for fear of the Britons, the aquilifer of the tenth legion threw himself overboard and, carrying the eagle, advanced alone against the enemy. His comrades, fearing disgrace, 'with one accord, leapt down from the ship' and were followed by troops from the other ships.

With the birth of the Roman Empire, the legions created a bond with their leader, the emperor himself. Each legion had another officer, called imaginifer, whose role was to carry a pike with the imago (image, sculpture) of the emperor as pontifex maximus.

Each legion, furthermore, had a vexillifer who carried a vexillum or signum, with the legion name and emblem depicted on it, unique to the legion. It was common for a legion to detach some sub-units from the main camp to strengthen other corps. In these cases, the detached subunits carried only the vexillum, and not the aquila, and were called, therefore, vexillationes. A miniature vexillum, mounted on a silver base, was sometimes awarded to officers as a recognition of their service upon retirement or reassignment.

Civilians could also be rewarded for their assistance to the Roman legions. In return for outstanding service, a citizen was given an arrow without a head. This was considered a great honour and would bring the recipient much prestige.

Discipline

The military discipline of the legions was quite harsh. Regulations were strictly enforced, and a broad array of punishments could be inflicted upon a legionary who broke them. Many legionaries became devotees in the cult of the minor goddess Disciplina, whose virtues of frugality, severity and loyalty were central to their code of conduct and way of life.

Minor punishments

Major punishments

Factors in the legion's success

Reenactment: Training

Examples of ideas that were copied and adapted include weapons like the gladius (Iberians) and warship design (cf. Carthaginians' quinquereme), as well as military units, such as heavy mounted cavalry and mounted archers (Parthians and Numidians).

See also

Notes

  1. Cornell, T. J. (1995): The Beginnings of Rome
  2. Data in: Goldsworthy, Adrian (2003). Complete Roman Army. pp 95-5; Holder, Paul (1980). Studies in the Auxilia of the Roman Army. pp 86–96; Elton, Hugh (1996). Frontiers of the Roman empire. pp 123. See table in article "Auxiliaries (Roman military)" for compilation of this data.
  3. Livy, Ab urbe condita, 2.30
  4. Mccall, Jeremiah B. The Cavalry of the Roman Republic: Cavalry Combat and Elite Reputations in the Middle and Late Republic. (New York, Routledge, 2002) pp. 53ff
  5. http://f.hypotheses.org/wp-content/blogs.dir/1447/files/2014/05/Roman-legions-212-AD-Centrici-site-Keilo-Jack.jpg
  6. Totals from summary of Notitia Dignitatum in Richardot, Philippe, La fin de l'armée romaine 284–476 [3rd ed.] Economica, 2005. ISBN 2-7178-4861-4.
  7. Jones, Later Roman Empire, pp. 1449-50
  8. Birley, Anthony R. Septimius Severus: The African Emperor. (New Haven, Yale University Press, 1989) p. 40
  9. Bowman, Garnsey, Rathbone (eds) The Cambridge Ancient History, Volume 11 pg. 326-327
  10. 1 2 Caesar's Civil War, Adrian Goldsworthy, Page 20
  11. Montesquieu C., Considerations on the Causes of the Greatness of the Romans and Their Decline, Hacket, 1999, p. 24

References

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  • Roman Warfare, Adrian Goldsworthy
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  • War, Gwynne Dyer.
  • The Evolution of Weapons and Warfare, Trevor N. Dupuy.
  • Flavius Vegetius Renatus, De Re Militari (with English translation on-line)
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  • The Punic Wars, Adrian Goldsworthy.
  • Carnage and Culture, Victor Davis Hanson
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  • The Military System Of The Romans, by Albert Harkness
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Wikimedia Commons has media related to Roman legion.
  1. Addison, Bickham, Diamond, Thompson, Penny, Christian, Anthony, Steve (2008). Humanities Dimensions History. 20 Thrackray Road, Port Melbourne,Victoria 3207: Pearson Education Australia. p. 135. ISBN 978-0-7339-8924-7.
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