The Auxilia of the Roman Imperial Army - G.L. Cheesman - ebook
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An essay on the Roman auxilia might seem merely to be one of the many monographs in which students of the military system of the Roman Empire are patiently arranging material for some future scholar to utilize in a more comprehensive work. But while much space must necessarily be devoted to details of military organization, the subject opens up social and political questions of wider range. The extent to which a ruling race can safely use the military resources of its subjects and the effect on both parties of such a relation, the advantages and dangers of a defensive or an aggressive frontier policy, these are questions of universal historical interest, on which even an essay of so limited a scope as this must necessarily touch in passing...

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THE AUXILIA OF THE ROMAN IMPERIAL ARMY

G.L. Cheesman

OZYMANDIAS PRESS

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Copyright © 2016 by G.L. Cheesman

Published by Ozymandias Press

Interior design by Pronoun

Distribution by Pronoun

ISBN: 9781531265533

TABLE OF CONTENTS

INTRODUCTION: THE MILITARY REFORMS OF AUGUSTUS

THE AUXILIA DURING THE FIRST TWO CENTURIES A.D.

SECTION I: THE STRENGTH AND ORGANIZATION OF THE AUXILIARY REGIMENTS

SECTION II: RECRUITING AND DISTRIBUTION

SECTION III: THE USE OF THE AUXILIA FOR WAR AND FRONTIER DEFENCE

SECTION IV: ARMS AND ARMOUR

CONCLUSION: THE BREAK-UP OF THE AUGUSTAN SYSTEM

APPENDIX I

APPENDIX II

INTRODUCTION: THE MILITARY REFORMS OF AUGUSTUS

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AN ESSAY ON THE ROMAN auxilia might seem merely to be one of the many monographs in which students of the military system of the Roman Empire are patiently arranging material for some future scholar to utilize in a more comprehensive work. But while much space must necessarily be devoted to details of military organization, the subject opens up social and political questions of wider range. The extent to which a ruling race can safely use the military resources of its subjects and the effect on both parties of such a relation, the advantages and dangers of a defensive or an aggressive frontier policy, these are questions of universal historical interest, on which even an essay of so limited a scope as this must necessarily touch in passing.

As a preliminary consideration it must be realized that the use of troops drawn from the subject races was not an invention of the imperial government, but goes back to the most flourishing days of the Republic. The heavy-armed yet mobile infantry which formed the greater part of the burgess militia of the cives Romani and the socii constituted an arm which won for Rome the hegemony of Italy, and triumphed alike over the numbers and courage of Ligurian and Gaul or the disciplined professional armies of Carthage and the Hellenistic monarchies. In other branches of the service, however, the republican armies were less superior. Their cavalry, drawn, as was usual in the citizen armies of the ancient world, from the wealthier classes, was not sufficiently numerous and proved no match for its opponents in the Second Punic War. The light troops came off even worse when engaged either with mountain tribes fighting on their own ground or with the skilled archers and slingers of Carthage or Macedon. So early was this recognized that, in describing an offer made by Hiero of Syracuse to furnish a thousand archers and slingers in 217 b.c., Livy is able to make the Syracusans justify the suggestion to Roman pride by asserting that it was already customary for the Republic to use externi in this capacity. To make up their notorious deficiency in this respect the Government could have recourse to three sources of supply. They could, as in this case, accept or demand contingents from allies outside the Italian military league, such as Hiero, Masinissa, or the Aetolians; they could make forced levies among subject tribes, such as the Ligurians, Gauls, or Spaniards; or, finally, they could imitate their opponents and raise mercenaries, although they might save their pride by including such contingents as ‘allies’. In fact all these sources were freely drawn on during the first half of the second century b.c., and all troops of this kind were known asauxilia, to distinguish them from the socii of the old organization. This at any rate seems to be the distinction recognized by the grammarians, and it agrees generally with the terminology employed by Livy, who may be supposed in such a matter to be following his sources. A good example both of republican methods and of the phraseology employed may be found in Livy’s elaborate description of the measures taken to make up the army required for the Macedonian campaign of 171 b.c.: ‘P. Licinio consuli ad exercitum civilem socialemque petenti addita auxilia Ligurum duo milia, Cretenses sagittarii—incertus numerus, quantum rogati auxilia Cretenses misissent, Numidae item equites elephantique.’ Of the troops grouped here under the heading of auxilia the Numidians represent a contingent sent by an independent ally, Masinissa, the Ligurians were probably obtained by a forced levy, while the Cretans, nominally allies, may fairly be described as mercenaries. That their services were hardly disinterested is shown by the fact that in the following year the Senate found it necessary to issue a sharp warning to the Cretan states against their habit of supplying contingents to both sides. The fact that the Roman star was now definitely in the ascendant probably reconciled the Cretans to this interference with their national customs, for from this date onward Cretan regiments regularly form a part of the republican armies; it will be remembered that the Senate made use of a body of Cretan archers against the followers of Caius Gracchus, and a similar corps is found serving under Caesar in his second Gallic campaign.

The course of the second century saw the auxilia still more firmly established as an essential part of the republican military system. Before its close the Roman and Italian cavalry had entirely disappeared; the changes in the condition of military service, in particular the tedious and unprofitable Spanish campaigns, made the members of the upper classes, among whom the cavalry had been recruited, increasingly reluctant to take their places in the ranks as private soldiers. After the reforms of Marius the legion had no cavalry attached to it, and if the Italian contingents still existed they must likewise have disappeared when, in consequence of the extension of the franchise in 90 and 89 b.c., the former socii were all enrolled in the legions. From this moment the Roman generals depended for their cavalry upon the auxilia alone. In the case of the light-armed troops the same process took place, although here military rather than political reasons probably predominated. The last recorded use of the velites, the old national light infantry, is during the war against Iugurtha, and they were probably abolished by Marius. There is certainly no instance of any but auxiliaries being employed as light troops during the following century. From these considerations it necessarily follows that when, during the last fifty years of the Republic, a standing army came into existence, a number of auxiliary regiments formed part of it. When Caesar mentions that he had Cretan archers, Balearic slingers, and Numidian cavalry under his command so early as the beginning of his second campaign, we can hardly doubt that these regiments had formed part of the regular troops which he found in the province.

Thus before the end of the Republic we have the chief feature of the military system of the Empire, the division of the army into the legions of cives Romani and the auxiliary light troops and cavalry supplied by the unenfranchised provincials, already in existence. Even the practice of conferring the civitas upon troops of this class as a reward for military service was resorted to by the Republic, although probably only under exceptional conditions. We possess a document recording a grant of this nature to some Spanish auxiliaries, members of a turma Salluitana which had distinguished itself at the siege of Asculum in 89 b.c.

There is no evidence, however, that this branch of the service escaped the effects of the inefficiency in administration which characterized the last generation of the republican régime. Certainly too few regiments of this class were kept on a permanent footing, and a general of the period either had to take the field with far too small a proportion of cavalry and light infantry, or make up the deficiency by hasty levies called out in the districts nearest to the scene of operations. Caesar, for example, started the campaign of 58 b.c. with a totally insufficient number of regular auxiliaries, and during the following years was forced to make up his deficiency in cavalry by demanding contingents, which were often of more than doubtful fidelity, from the Gallic tribes which successively submitted to his arms. To supplement these he also raised a corps of German mercenaries and largely increased it later after the defection of the majority of the Gallic contingents to Vercingetorix.

The civil wars saw a large increase in the numbers of the auxilia. Caesar set the example by leading off thousands of his Gallic cavalry, with the object, doubtless, of using them as hostages for their compatriots’ fidelity as well as of increasing his army. Pompeius followed suit and endeavoured to make up for the loss of the Italian recruiting ground by enrolling auxilia from the Eastern provinces in large numbers. The Gallic cavalry proved a great success; in the campaign of Thapsus they showed marked superiority to the African light horse, previously accounted supreme in cavalry warfare, and the death of Caesar found them still serving in large numbers in every part of the Empire. At least those who are found, together with Lusitanians and Spaniards, in the army of Brutus and Cassius during the Philippi campaign must have been stationed either in Macedonia or the East before hostilities began.

We can thus see that when the battle of Actium in 31 b.c. placed the forces of the Roman world in the hands of Augustus, the main lines on which the military system of the Empire was based were already clearly marked, and his great work of reorganization, while importing everywhere order and principle into existing practice, involved no breach with the military traditions of the past. To say this is in no sense to minimize his achievement. It must be remembered that while individual generals, such as Lucullus, Pompeius, or Caesar, had brought their armies to a high pitch of efficiency, the general military administration of the late republic had been chaotic in the extreme. Here, as elsewhere, the real issues were resolutely evaded, and in case of need a crisis had to be met by hasty and inefficient improvisation. Although a standing army had existed in practice for fifty years it was never accepted in principle, and no attempt was made to assess the military requirements of the state and see that an efficient force of the proper strength was maintained. With similar lack of foresight the Senate refused to admit the principle of granting a donative on discharge, while repeatedly granting it under pressure, thus weakening the control of the central government over troops in the field and increasing the chances of a military pronunciamento. In consequence, the wars of this period almost invariably begin with disasters in the field, owing to the inadequacy of the standing army both in numbers and efficiency, and end with a political crisis of greater or less magnitude over the donative grievance, which naturally gave an ambitious general an opportunity of using the support of his troops to further his own ends. The work of Augustus in bringing order out of this chaos, providing forces adequate to the needs of the state, and re-establishing over them the control of the central government, is not the least of his administrative triumphs.

As a preliminary he accepted, as was perhaps inevitable, the principle of a standing army of professional soldiers. This step has of late been severely criticized, especially by admirers of the Continental system, but it is difficult to see how short-service levies could have proved adequate to the defence of frontiers which were, for all practical purposes, more distant from Rome than Peshawur is from Aldershot. The other alternative, to entrust the provincials with the defence of their own borders, was not in harmony with his general policy, nor, it may be said, was the time ripe for such a step. The words which the third-century historian and administrator, Dio Cassius, puts into the mouth of Maecenas in dealing with this question were written doubtless with reference to the conditions of his own time, but they may certainly be applied to the earlier period, and in essence they still hold good to-day.

‘You will be wise to maintain a permanent force (στρατιώτας ἀθανάτους) raised from the citizens, the subjects, and the allies distributed throughout all the provinces in larger or smaller bodies, as necessity requires. These troops must always remain in arms and be drilled constantly; at the most suitable points they must prepare themselves winter quarters, and they must serve for a fixed period calculated to allow them a little freedom after their discharge before old age comes on. For we can no longer rely upon forces called out for the occasion, owing to the distance which separates us from the borders of our Empire and the enemies which we have upon every side. If we allow all our subjects who are of military age to possess arms and undergo a military training, there will be a continual series of riots and civil wars, while if, on the other hand, we check all military activity on their part, we shall run the risk of finding nothing but raw and untrained troops when we need a contingent for our assistance.’

The solution which Augustus found for this problem was then to revise the military system so that, while using as much as possible of the available material, he did not disturb the political conditions on which the equilibrium of the State depended. For it was no part of his intention materially to alter the structure of the Empire as an aggregate of states possessed of greater or less powers of self-government, held together by their subordination to Rome and withheld by their position from any independent external policy. Whatever possibilities he may have contemplated for the future he made himself few attempts to further the process of unification either by reducing the inhabitants of the privileged states to a lower grade or by the more generous policy of making wide extensions of the franchise and creating by this means a new imperial citizenship. This difference of status among the inhabitants of the Empire was naturally reflected in the military system. The cives Romani—that is to say, the inhabitants of Italy and of the few enfranchised communities among the provinces—furnished the new Household Troops, and the greater part, at any rate, of the recruits for the legions, and paid for their superior position as the ruling race by contributing much more heavily in proportion to their numbers than any other class in the population. The nominally independent monarchs of the client kingdoms were allowed and encouraged to maintain armies, often of considerable size, under their own control, and frequently led in person the contingents which they were called upon to bring to the aid of the regular troops when hostilities were taking place near their borders. These contingents were often numerous and capable of rendering valuable service. Thus Rhoemetalces of Thrace assisted in the suppression of the dangerous Pannonian revolt of 6-9, and Ptolemaeus of Mauretania was publicly honoured for his loyal co-operation against the African rebel Tacfarinas. Along the eastern frontier, kingdoms of this type, the wreckage of the old Hellenistic system, were more numerous and played a more important part. Thus Antiochus III of Commagene, Agrippa II, Sohaemus of Emesa, and Malchus of Damascus contributed 15,000 men to the army which Vespasian led into Palestine in the spring of 67.Even the more autonomous city states seem to have retained a militia which was occasionally made use of. So late as the reign of Hadrian, in the army which Arrian led against the Alani, we find a contingent from the ‘free’ city of Trapezus, which is reckoned among the σύμμαχοι as opposed to the regular imperial troops. A similar freedom from the direct control of Roman officers was permitted to the chiefs of some of the border tribes, who were allowed to lead their own clansmen to battle. To this type of militia belong the tumultuariae catervae Germanorum cis Rhenum colentium, including the Batavians under their dux Chariovalda, who serve in the campaigns of Germanicus, and the levies of the Dalmatian clans who started the rebellion of 6.

Last come the permanently embodied regiments raised from the subject communities, the auxilia properly so called, who form the subject of this treatise. Here, probably more than in any other department of the military system of the Empire, we can trace the results of Augustus’s own activity. Regiments of this kind had, as we have seen, existed under the Republic, but they had probably been few in number and the incidence of the levy had been uneven and capricious. Under Augustus not only was the number of regiments largely increased—we hear of no less than fourteen alae and seventy cohorts taking part in the Pannonian War of 6-9—but the inscriptions show us that, with the exception of Greece, always the spoiled child of Roman sentiment, every quarter of the Empire contributed its quota. Details respecting the incidence of this levy on different provinces, and the methods of organization and recruiting, will be found in later sections. It will be sufficient to say here that while the subject communities had probably more reason than any other class to complain of the military demands of the state, the burden was at least more equitably distributed than under the Republic and the total contribution required, in most cases at any rate, not excessive. It is natural to suppose that the fixing of the quota supplied by each community was connected with the drawing up of the census, which placed the taxation of the Empire for the first time on an organized basis, and it seems probable that more evidence might show a reciprocal variation between the two forms of contribution required. We know, for instance, that the Batavians were altogether excused from the payment of tribute on account of the size and value of their contingent, and this case was probably not exceptional.

In all this it is easy to see how much Augustus owes to the institutions of the Republic, and when we come to consider details his debt becomes even more apparent. A standing army consisting of legions of cives Romani and smaller units of peregrini, supported in the field by contingents from allied and nominally independent states, was already in existence. His task was merely to introduce such changes as might obviate the mistakes and failures of the past, and to establish principles which should make for permanence and stability. For in accepting the principle of maintaining a standing army Augustus could not have been blind to the political dangers which this institution brought with it. He endeavoured to meet them by fixing the conditions of service, in particular the sum which a soldier might claim at his discharge, and by establishing a special treasury from which those claims might be satisfied, thus accustoming the troops to look to the central government, not to their generals, for rewards due to them. Moreover, in this department of the state even Augustus allowed no respect for constitutional forms to veil or weaken his authority. When in 69 the legions on the Upper Rhine tore down the imagines of Galba and swore allegiance to the oblitterata iam nomina senatus populique Romani it was a manifest sign that after a century of peace a new period of anarchy had begun.

Since this military system, with its division of the troops into categories differing from each other in status and prestige, reflected the general conditions prevalent in the Empire, so it was inevitable that a change in these conditions should have its effect also upon the army. How far the political developments of the first century were foreseen or intended by Augustus it is perhaps impossible to say; it is certain, at any rate, that his system was capable of adapting itself to them. One of these developments was a steady increase in the power of the central government and a disappearance of all forms of local autonomy which involved a division of authority. By the reign of Vespasian almost all the great client kingdoms had been more or less peaceably absorbed into the ordinary provincial system. Cappadocia was annexed in 17, Mauretania in 39, Thrace in 46, Pontus in 63, and Commagene in 73. The troops which these kingdoms had maintained were naturally taken into the Roman service, transformed into auxiliary regiments, and lost the privilege which attached to their former condition of serving only in local campaigns. One instance of such a transference, in the case of a regiment which had been in the service of the kings of Pontus, is mentioned in Tacitus, and we also meet with Hemeseni on the Danube, Commageni in Africa and Noricum, and the successors of one of Herod’s old Samaritan regiments in Mauretania. The resentment with which the new conditions of service were sometimes received is an instructive comment on the wisdom of Augustus’s policy in not enforcing their universal applicability at an earlier date. The Thracians, for example, rose in open revolt when they were first summoned to supply a contingent for service at a distance from their own borders. Somewhat similar was the fate of the border militia on the Rhine and Danube. On the latter frontier the revolt of 6-9 showed at an early date the dangers of the system. After its suppression the clan chiefs seem, in many cases at any rate, to have been deposed and replaced by Roman officials, regiments of Pannonians and Dalmatians were raised and transferred to other provinces, and a garrison was imported from outside to control the country. On the Rhine the process was a more gradual one. The Batavi, for example, whom we have noticed serving in the campaigns of Germanicus as a clan levy under their dux Chariovalda, seem to have been organized in regular auxiliary regiments by the middle of the first century, although they still retained, in common with many other corps of Rhenish auxilia, their clan chiefs as their praefecti. In the year 69 we also find the Helvetii still responsible for maintaining the garrison of a fort within their borders, and a militia existing in Raetia capable of supplementing the garrison of regular auxilia. Some even of the Gallic states, which were more distant from the frontier, sent contingents to support Vitellius, which were not, however, regarded as a very sensible addition to his forces.