section_path: Society/Military
section_name: Military
paragraph_text: Military
  
  The early Roman army (c. 500 BC) was, like those of other contemporary city-states influenced by Greek civilisation, a citizen militia that practised hoplite tactics. It was small and organised in five classes (in parallel to the comitia centuriata, the body of citizens organised politically), with three providing hoplites and two providing light infantry. The early Roman army was tactically limited and its stance during this period was essentially defensive.
  
  By the 3rd century BC, the Romans abandoned the hoplite formation in favour of a more flexible system in which smaller groups of 120 (or sometimes 60) men called maniples could manoeuvre more independently on the battlefield. Thirty maniples arranged in three lines with supporting troops constituted a legion, totalling between 4,000 and 5,000 men. The early Republican legion consisted of five sections: the three lines of manipular heavy infantry (hastati, principes and triarii), a force of light infantry (velites), and the cavalry (equites). With the new organisation came a new orientation toward the offensive and a much more aggressive posture toward adjoining city-states. At nominal full strength, an early Republican legion included 3,600 to 4,800 heavy infantry, several hundred light infantry, and several hundred cavalrymen.
  
  Until the late Republican period, the typical legionary was a property-owning citizen farmer from a rural area (an adsiduus) who served for particular (often annual) campaigns, and who supplied his own equipment. After 200 BC, economic conditions in rural areas deteriorated as manpower needs increased, so that the property qualifications for compulsory service were gradually reduced. Beginning in the 3rd century BC, legionaries were paid a stipend (stipendium). By the time of Augustus, the ideal of the citizen-soldier had been abandoned and the legions had become fully professional. At the end of the Civil War, Augustus reorganised Roman military forces, discharging soldiers and disbanding legions. He retained 28 legions, distributed through the provinces of the Empire.
  
  During the Principate, the tactical organisation of the Army continued to evolve. The auxilia remained independent cohorts, and legionary troops often operated as groups of cohorts rather than as full legions. A new and versatile type of unit, the cohortes equitatae, combined cavalry and legionaries in a single formation. They could be stationed at garrisons or outposts and could fight on their own as balanced small forces or combine with similar units as a larger, legion-sized force. This increase in organizational flexibility helped ensure the long-term success of Roman military forces. The Emperor Gallienus (253–268 AD) began a reorganisation that created the last military structure of the late Empire. Withdrawing some legionaries from the fixed bases on the border, Gallienus created mobile forces (the comitatenses or field armies) and stationed them behind and at some distance from the borders as a strategic reserve. The border troops (limitanei) stationed at fixed bases continued to be the first line of defence. The basic units of the field army were regimental; legiones or auxilia for infantry and vexillationes for cavalry. Nominal strengths may have been 1,200 men for infantry regiments and 600 for cavalry, but actual troop levels could have been much lower—800 infantry and 400 cavalry. Many infantry and cavalry regiments operated in pairs under the command of a comes. Field armies included regiments recruited from allied tribes and known as foederati. By 400 AD, foederati regiments had become permanently established units of the Roman army, paid and equipped by the Empire, led by a Roman tribune and used just as Roman units were used. The Empire also used groups of barbarians to fight along with the legions as allies without integration into the field armies, under overall command of a Roman general, but led by their own officers.
  
  Military leadership evolved over the course of the history of Rome. Under the monarchy, the hoplite armies were led by the kings. During the early and middle Roman Republic, military forces were under the command of one of the two elected consuls for the year. During the later Republic, members of the Roman Senatorial elite, as part of the normal sequence of elected public offices known as the cursus honorum, would have served first as quaestor (often posted as deputies to field commanders), then as praetor. Following the end of a term as praetor or consul, a Senator might be appointed by the Senate as a propraetor or proconsul (depending on the highest office held before) to govern a foreign province. Under Augustus, whose most important political priority was to place the military under a permanent and unitary command, the Emperor was the legal commander of each legion but exercised that command through a legatus (legate) he appointed from the Senatorial elite. In a province with a single legion, the legate commanded the legion (legatus legionis) and served as provincial governor, while in a province with more than one legion, each legion was commanded by a legate and the legates were commanded by the provincial governor (also a legate but of higher rank).
  
  During the later stages of the Imperial period (beginning perhaps with Diocletian), the Augustan model was abandoned. Provincial governors were stripped of military authority, and command of the armies in a group of provinces was given to generals (duces) appointed by the Emperor. These were no longer members of the Roman elite but men who came up through the ranks and had seen much practical soldiering. With increasing frequency, these men attempted (sometimes successfully) to usurp the positions of the Emperors. Decreased resources, increasing political chaos and civil war eventually left the Western Empire vulnerable to attack and takeover by neighbouring barbarian peoples.