Roman Army Legions and Camps

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legion soldiers

Roman foot soldiers that served in military units called legions were called legionaries. Elite soldiers were called Centurians. "The golden eagle which glittered in the front of the legion was the object of the fondest devotion," wrote Edward Gibbon in the Decline and Fall of the Roman Empire. Each legion had its own symbol. The emblem of the 20th legion, for example, was the wild boar.

Flavius Vegetius Renatus (died A.D. 450) wrote in “De Re Militari”: “The Macedonians, the Greeks and the Dardanians formed their troops into phalanxes of eight thousand men each. The Gauls, Celtiberians and many other barbarous nations divided their armies into bodies of six thousand each. The Romans have their legions usually six thousand strong, sometimes more. [Source: De Re Militari (Military Institutions of the Romans) by Flavius Vegetius Renatus (died A.D. 450), written around A.D. 390. translated from the Latin by Lieutenant John Clarke Text British translation published in 1767. Etext version by Mads Brevik (2001)]

“We shall now explain the difference between the legions and the auxiliaries. The latter are hired corps of foreigners assembled from different parts of the Empire, made up of different numbers, without knowledge of one another or any tie of affection. Each nation has its own peculiar discipline, customs and manner of fighting. Little can be expected from forces so dissimilar in every respect, since it is one of the most essential points in military undertakings that the whole army should be put in motion and governed by one and the same order. But it is almost impossible for men to act in concert under such varying and unsettled circumstances. They are, however, when properly trained and disciplined, of material service and are always joined as light troops with the legions in the line. And though the legions do not place their principal dependence on them, yet they look on them as a very considerable addition to their strength.

“But the complete Roman legion, in its own peculiar cohorts, contains within itself the heavy-armed foot, that is: the principes, hastati, triarii, and antefignani, the lightarmed foot, consisting of the ferentarii, archers, slingers, and balistarii, together with the legionary cavalry incorporated with it. These bodies, all actuated with the same spirit, are united inseparably in their various dispositions for forming, encamping and fighting. Thus the legion is compact and perfect in all its parts and, without any foreign assistance, has always been superior to any force that could be brought against it. The Roman greatness is a proof of the excellence of their legions, for with them they always defeated whatever numbers of the enemy they thought fit, or their circumstances gave them an opportunIty to engage.

Websites on Ancient Rome: Internet Ancient History Sourcebook: Rome ; Internet Ancient History Sourcebook: Late Antiquity ; Forum Romanum ; “Outlines of Roman History”; “The Private Life of the Romans”|; BBC Ancient Rome; Perseus Project - Tufts University; ; Lacus Curtius; The Roman Empire in the 1st Century; The Internet Classics Archive ; Bryn Mawr Classical Review; De Imperatoribus Romanis: An Online Encyclopedia of Roman Emperors; British Museum; Oxford Classical Art Research Center: The Beazley Archive ; Metropolitan Museum of Art; The Internet Classics Archive ; Cambridge Classics External Gateway to Humanities Resources; Internet Encyclopedia of Philosophy; Stanford Encyclopedia of Philosophy; Ancient Rome resources for students from the Courtenay Middle School Library ; History of ancient Rome OpenCourseWare from the University of Notre Dame / ; United Nations of Roma Victrix (UNRV) History

Organization of the Legion

Flavius Vegetius Renatus wrote in “De Re Militari”: “All our writers agree that never more than two legions, besides auxiliaries, were sent under the command of each consul against the most numerous armies of the enemies. Such was the dependence on their discipline and resolution that this number was thought sufficient for any war they were engaged in. I shall therefore explain the organization of the ancient legion according to the military constitution. But if the description appear obscure or imperfect, it is not to be imputed to me, but to the difficulty of the subject itself, which is therefore to be examined with the greater attention. A prince, skilled himself in military affairs, has it in his power to make himself invincible by keeping up whatever number of well disciplined forces he thinks proper. [Source: De Re Militari (Military Institutions of the Romans) by Flavius Vegetius Renatus (died A.D. 450), written around A.D. 390. translated from the Latin by Lieutenant John Clarke Text British translation published in 1767. Etext version by Mads Brevik (2001)]

legion soldiers in a testudo (tortoise) formation

“The recruits having thus been carefully chosen with proper attention to their persons and dispositions, and having been daily exercised for the space of four months at least, the legion is formed by the command and under the auspices of the Emperor. The military mark, which is indelible, is first imprinted on the hands of the new levies, and as their names are inserted in the roll of the legions they take the usual oath, called the military oath. They swear by God, by Christ and by the Holy Ghost; and by the Majesty of the Emperor who, after God, should be the chief object of the love and veneration of mankind. For when he has once received the title of August, his subjects are bound to pay him the most sincere devotion and homage, as the representative of God on earth. And every man, whether in a private or military station, serves God in serving him faithfully who reigns by His authority. The soldiers, therefore, swear they will obey the Emperor willingly and implicitly in all his commands, that they will never desert and will always be ready to sacrifice their lives for the Roman Empire.

“The legion should consist of ten cohorts, the first of which exceeds the others both in number and quality of its soldiers, who are selected to serve in it as men of some family and education. This cohort has the care of the eagle, the chief ensign in the Roman armies and the standard of the whole legion, as well as of the images of the emperors which are always considered as sacred. It consists of eleven hundred and five foot and one hundred and thirty-two horse cuirassiers, and is distinguished by the name of the Millarian Cohort. It is the head of the legion and is always first formed on the right of the first line when the legion draws up in order of battle.

“The second cohort contains five hundred and fifty-five foot and sixty-six horse, and is called the Quingentarian Cohort. The third is composed of five hundred and fiftyfive foot and sixty-six horse, generally chosen men, on account of its situation in the center of the first line. The fourth consists of the same number of five hundred and fifty-five foot and sixty-six horse. The fifth has likewise five hundred and fifty-five foot and sixty-six horse, which should be some of the best men, being posted on the left flank as the first cohort is on the right. These five cohorts compose the first line.

“The sixth includes five hundred and fifty-five foot and sixty-six horse, which should be the flower of the young soldiers as it draws up in the rear of the eagle and the images of the emperors, and on the right of the second line. The seventh contains five hundred and fifty-five foot and sixty-six horse. The eighth is composed of five hundred and fifty-five foot and sixty-six horse, all selected troops, as it occupies the center of the second line. The ninth has five hundred and fifty-five foot and sixty-six horse. The tenth consists of the same number of five hundred and fifty-five foot and sixty-six horse and requires good men, as it closes the left flank of the second line. These ten cohorts form the complete legions, consisting in the whole of six thousand one hundred foot and seven hundred and twenty-six horses. A legion should never be composed of a less number of men, but it is sometimes stronger by the addition of other Millarian Cohorts.

Officers of the Legion

Flavius Vegetius Renatus wrote in “De Re Militari”: “Having shown the ancient establishment of the legion, we shall now explain the names of the principal soldiers or, to use the proper term, the officers, and their ranks according to the present rolls of the legions. The first tribune is appointed by the express commission and choice of the Emperor. The second tribune rises to that rank by length of service. The tribunes are so called from their command over the soldiers, who were at first levied by Romulus out of the different tribes. The officers who in action commanded the orders or divisions are called Ordinarii. The Augustales were added by Augustus to the Ordinarii; and the Flaviales were appointed by Flavius Vespasian to double the number of the Augustales. The eagle-bearers and the image-bearers are those who carry the eagles and images of the Emperors. The Optiones are subaltern officers, so denominated from their being selected by the option of their superior officers, to do their duty as their substitutes or lieutenants in case of sickness or other accident. The ensign-bearers carry the ensigns and are called Draconarii. The Tesserarii deliver the parole and the orders of the general to the different messes of the soldiers. The Campignei or Antefignani are those whose duty it is to keep the proper exercises and discipline among the troops. [Source: De Re Militari (Military Institutions of the Romans) by Flavius Vegetius Renatus (died A.D. 450), written around A.D. 390. translated from the Latin by Lieutenant John Clarke Text British translation published in 1767. Etext version by Mads Brevik (2001)]

Roman army officer

“The Metatores are ordered before the army to fix on the ground for its encampments. The Beneficiarii are so named from their owing their promotion to the benefit or interest of the Tribunes. The Librarii keep the legionary accounts. The Tubicines, Cornicines, and Buccinatores derive their appellations from blowing the trumpet, cornet, and buccina. Those who, expert in their exercises, receive a double allowance of provisions, are called Armaturae Duplares, and those who have but a single portion, Simplares. The Mensores mark out the ground by measure for the tents in an encampment, and assign the troops their respective quarters in garrison. The Torquati, so denominated from the gold collars given them in reward for their bravery, had besides this honor different allowances. Those who received double were called Torquati Duplares, and those who had only single, Simplares. There were, for the same reason, Candidatii Duplares, and Candidatii Simplares. These are the principal soldiers or officers distinguished by their rank and privileges thereto annexed. The rest are called Munifices, or working soldiers, from their being obliged to every kind of military work without exception. [Source: De Re Militari (Military Institutions of the Romans) by Flavius Vegetius Renatus (died A.D. 450), written around A.D. 390. translated from the Latin by Lieutenant John Clarke Text British translation published in 1767. Etext version by Mads Brevik (2001)]

“Formerly it was the rule that the first Princeps of the legion should be promoted regularly to the rank of Centurion of the Primiple. He not only was entrusted with the eagle but commanded four centuries, that is, four hundred men in the first line. As head of the legion he had appointments of great honor and profit. The first Hastatus had the command of two centuries or two hundred men in the second line, and is now called Ducenarius. The Princeps of the first cohort commanded a century and a half, that is, one hundred and fifty men, and kept in a great measure the general detail of the legion. The second Hastatus had likewise a century and a half, or one hundred and fifty men. The first Triarius had the command of one hundred men. Thus the ten centuries of the first cohort were commanded by five Ordinarii, who by the ancient establishment enjoyed great honors and emoluments that were annexed to this rank in order to inspire the soldiers of the legions with emulation to attain such ample and considerable rewards. They had also Centurions appointed to each century, now called Centenarii and Decani, who commanded ten men, now called heads of messes. The second cohort had five Centurions; and all the rest to the tenth inclusively the same number. In the whole legion there were fiftyfive.

“Lieutenants of consular dignity were formerly sent to command in the armies under the general, and their authority extended over both the legions and auxiliaries in peace and war. Instead of these officers, persons of high rank are now substituted with the title of Masters of the Forces. They are not limited to the command of two legions only, but have often a greater number. But the peculiar officer of the legion was the Praefect, who was always a count of the first order. On him the chief command devolved in the absence of the lieutenant. The Tribunes, Centurions, and all the soldiers in general were under his orders: He gave out the parole and order for the march and for the guards. And if a soldier committed a crime, by his authority the Tribune adjudged him to punishment. He had charge of the arms, horses, clothing and provisions. It was also his duty to keep both the legionary horse and foot in daily exercise and to maintain the strictest discipline. He ought to be a careful and diligent officer, as the sole charge of forming the legion to regularity and obedience depended on him and the excellence of the soldiers redounded entirely to his own honor and credit.

“The Praefect of the camp, though inferior in rank to the former, had a post of no small importance. The position of the camp, the direction of the entrenchments, the inspection of the tents or huts of the soldiers and the baggage were comprehended in his province. His authority extended over the sick, and the physicians who had the care of them; and he regulated the expenses relative thereto. He had the charge of providing carriages, bathorses and the proper tools for sawing and cutting wood, digging trenches, raising parapets, sinking wells and bringing water into the camp. He likewise had the care of furnishing the troops with wood and straw, as well as the rams, onagri, balistae and all the other engines of war under his direction. This post was always conferred on an officer of great skill, experience and long service, and who consequently was capable of instructing others in those branches of the profession in which he had distinguished himself.

Causes of Decay of the Legion

Flavius Vegetius Renatus wrote in “De Re Militari”: “The name of the legion remains indeed to this day in our armies, but its strength and substance are gone, since by the neglect of our predecessors, honors and preferments, which were formerly the recompenses of merit and long services, were to be attained only by interest and favor. Care is no longer taken to replace the soldiers, who after serving their full time, have received their discharges. The vacancies continually happening by sickness, discharges, desertion and various other casualties, if not supplied every year or even every month, must in time disable the most numerous army. Another cause of the weakness of our legions is that in them the soldiers find the duty hard, the arms heavy, the rewards distant and the discipline severe. To avoid these inconveniences, the young men enlist in the auxiliaries, where the service is less laborious and they have reason to expect more speedy recompenses. [Source: De Re Militari (Military Institutions of the Romans) by Flavius Vegetius Renatus (died A.D. 450), written around A.D. 390. translated from the Latin by Lieutenant John Clarke Text British translation published in 1767. Etext version by Mads Brevik (2001)]

“Cato the Elder, who was often Consul and always victorious at the head of the armies, believed he should do his country more essential service by writing on military affairs, than by all his exploits in the field. For the consequences of brave actions are only temporary, while whatever is committed to writing for public good is of lasting benefit. Several others have followed his example, particularly Frontinus, whose elaborate works on this subject were so well received by the Emperor Trajan. These are the authors whose maxims and institutions I have undertaken to abridge in the most faithful and conclse manner.

“The expense of keeping up good or bad troops is the same; but it depends wholly on You, most August Emperor, to recover the excellent discipline of the ancients and to correct the abuses of later times. This is a reformation the advantages of which will be equally felt by ourselves and our posterity.

Roman Army Camp

Josephus (A.D. 37- after 93) wrote: “As for what is within the camp, it is set apart for tents, but the outward circumference hath the resemblance to a wall, and is adorned with towers at equal distances, where between the towers stand the engines for throwing arrows and darts, and for slinging stones, and where they lay all other engines that can annoy the enemy, all ready for their several operations. They also erect four gates, one at every side of the circumference, and those large enough for the entrance of the beasts, and wide enough for making excursions, if occasion should require. They divide the camp within into streets, very conveniently, and place the tents of the commanders in the middle; but in the very midst of all is the general's own tent, in the nature of a temple, insomuch, that it appears to be a city built on the sudden, with its market-place, and place for handicraft trades, and with seats for the officers superior and inferior, where, if any differences arise, their causes are heard and determined. The camp, and all that is in it, is encompassed with a wall round about, and that sooner than one would imagine, and this by the multitude and the skill of the laborers; and, if occasion require, a trench is drawn round the whole, whose depth is four cubits, and its breadth equal. [Source: Flavius Josephus (37- after 93 A.D.), “The Jewish War, Book III, .5-6, translated by William Whiston]

“When they have thus secured themselves, they live together by companies, with quietness and decency, as are all their other affairs managed with good order and security. Each company hath also their wood, and their corn, and their water brought them, when they stand in need of them; for they neither sup nor dine as they please themselves singly, but all together. Their times also for sleeping, and watching, and rising are notified beforehand by the sound of trumpets, nor is any thing done without such a signal; and in the morning the soldiery go every one to their centurions, and these centurions to their tribunes, to salute them; with whom all the superior officers go to the general of the whole army, who then gives them of course the watchword and other orders, to be by them cared to all that are under their command; which is also observed when they go to fight, and thereby they turn themselves about on the sudden, when there is occasion for making sallies, as they come back when they are recalled in crowds also.

“Now when they are to go out of their camp, the trumpet gives a sound, at which time nobody lies still, but at the first intimation they take down their tents, and all is made ready for their going out; then do the trumpets sound again, to order them to get ready for the march; then do they lay their baggage suddenly upon their mules, and other beasts of burden, and stand, as at the place of starting, ready to march; when also they set fire to their camp, and this they do because it will be easy for them to erect another camp, and that it may not ever be of use to their enemies. Then do the trumpets give a sound the third time, that they are to go out, in order to excite those that on any account are a little tardy, that so no one may be out of his rank when the army marches. Then does the crier stand at the general's right hand, and asks them thrice, in their own tongue, whether they be now ready to go out to war or not? To which they reply as often, with a loud and cheerful voice, saying, "We are ready." And this they do almost before the question is asked them: they do this as filled with a kind of martial fury, and at the same time that they so cry out, they lift up their right hands also.

legion camp

Roman Military Camps Outside The Empire

Heather Ramsey of Listverse wrote: “Beyond the Empire’s northern frontier along the Rhine River, the Romans had repeatedly tried to conquer unruly German tribes but were unsuccessful. That didn’t stop the Romans from boasting in written records that their military occasionally pushed into Germany, most likely to retaliate for German attacks in Roman territory. Until recently, many historians believed it was just empty talk. [Source: Heather Ramsey, Listverse, March 4, 2015 ]

“However, in 2010, an 18-hectare (44 acre) Roman military camp was accidentally discovered in eastern Germany near the village of Hachelbich when land was being excavated to build a road there. The camp may have accommodated up to 5,000 soldiers. Combined with the 2008 discovery of another battlefield around Hannover, the encampment at Hachelbich suggests that the written reports are true.

“Many elements of the camp are consistent with construction and use by the Roman military. Surrounded by trenches about 1 meter (3 ft) deep, the area is a rectangle with rounded corners. As part of the perimeter defense, a dirt wall was erected with tall stakes on top to make a 3-meter-high (10 ft) barricade. The actual wall is gone, of course, but archaeologists could see discolorations in the ground where it used to stand. They also found nails from Roman boots, bread ovens, and a few other Roman artifacts that appear to be from the first and second centuries.

““Now we have the first camp that’s clearly more than a day trip from the edge of the empire,” said Michael Meyer, an archaeologist from the Free University of Berlin. “It’s no isolated frontier outpost but something that clearly points to the Elbe River [deep in German territory].”

Entrenched Camps

Flavius Vegetius Renatus wrote in “De Re Militari”: “Recruits are to be instructed in the manner of entrenching camps, there being no part of discipline so necessary and useful as this. For in a camp, well chosen and entrenched, the troops both day and night lie secure within their works, even though in view of the enemy. It seems to resemble a fortified city which they can build for their safety wherever they please. But this valuable art is now entirely lost, for it is long since any of our camps have been fortified either with trenches or palisades. By this neglect our forces have been often surprised by day and night by the enemy's cavalry and suffered very severe losses. The importance of this custom appears not only from the danger to which troops are perpetually exposed who encamp without such precautions, but from the distressful situation of an army that, after receiving a check in the field, finds itself without retreat and consequently at the mercy of the enemy. [Source: De Re Militari (Military Institutions of the Romans) by Flavius Vegetius Renatus (died A.D. 450), written around A.D. 390. translated from the Latin by Lieutenant John Clarke Text British translation published in 1767. Etext version by Mads Brevik (2001)]

location of major legion camps in AD 400

“A camp, especially in the neighborhood of an enemy, must be chosen with great care. Its situation should be strong by nature, and there should be plenty of wood, forage and water. If the army is to continue in it any considerable time, attention must be had to the salubrity of the place. The camp must not be commanded by any higher grounds from whence it might be insulted or annoyed by the enemy, nor must the location be liable to floods which would expose the army to great danger. The dimensions of the camps must be determined by the number of troops and quantity of baggage, that a large army may have room enough, and that a small one may not be obliged to extend itself beyond its proper ground. The form of the camps must be determined by the site of the country, in conformity to which they must be square, triangular or oval. The Praetorian gate should either front the east or the enemy. In a temporary camp it should face the route by which the army is to march. Within this gate the tents of the first centuries or cohorts are pitched, and the dragons [The dragon was the particular ensign of each cohort] and other ensigns planted. The Decumane gate is directly opposite to the Praetorian in the rear of the camp, and through this the soldiers are conducted to the place appointed for punishment or execution.

“There are two methods of entrenching a camp. When the danger is not imminent, they carry a slight ditch round the whole circuit, only nine feet broad and seven deep. With the turf taken from this they make a kind of wall or breastwork three feet high on the inner side of the ditch. But where there is reason to be apprehensive of attempts of the enemy, the camp must be surrounded with a regular ditch twelve feet broad and nine feet deep perpendicular from the surface of the ground. A parapet is then raised on the side next the camp, of the height of four feet, with hurdles and fascines properly covered and secured by the earth taken out of the ditch. From these dimensions the interior height of the intrenchment will be found to be thirteen feet, and the breadth of the ditch twelve. On the top of the whole are planted strong palisades which the soldiers carry constantly with them for this purpose. A sufficient number of spades, pickaxes, wicker baskets and tools of all kinds are to be provided for these works.

“There is no difficulty in carrying on the fortifications of a camp when no enemy is in sight. But if the enemy is near, all the cavalry and half the infantry are to be drawn up in order of battle to cover the rest of the troops at work on the entrenchments and be ready to receive the enemy if they offer to attack. The centuries are employed by turns on the work and are regularly called to the relief by a crier till the whole is completed. It is then inspected and measured by the centurions, who punish such as have been indolent or negligent. This is a very important point in the discipline of young soldiers, who when properly trained to it will be able in an emergency to fortify their camp with skill and expedition.

Rules for Encamping an Army

20120224-Hadrians Wall Latrine2.jpg
Hadrian's Wall latrine
Flavius Vegetius Renatus wrote in “De Re Militari”: “An army on the march cannot expect always to find walled cities for quarters, and it is very imprudent and dangerous to encamp in a straggling manner without some sort of entrenchment. It is an easy matter to surprise troops while refreshing themselves or dispersed in the different occupations of the service. The darkness of night, the necessity of sleep and the dispersion of the horses at pasture afford opportunities of surprise. A good situation for a camp is not sufficient; we must choose the very best that can be found lest, having failed to occupy a more advantageous post the enemy should get possession of it to our great detriment. [Source: De Re Militari (Military Institutions of the Romans) by Flavius Vegetius Renatus (died A.D. 450), written around A.D. 390. translated from the Latin by Lieutenant John Clarke Text British translation published in 1767. Etext version by Mads Brevik (2001)]

“An army should not encamp in summer near bad waters or far from good ones, nor in winter in a situation without plenty of forage and wood. The camp should not be liable to sudden inundations. The avenues should not be too steep and narrow lest, if invested, the troops should find it difficult to make their retreat; nor should it be commanded by any eminences from which it may be annoyed by the enemy's weapons. After these precautions, the camp is formed square, round, triangular or oblong, according to the nature of the ground. For the form of a camp does not constitute its goodness. Those camps, however, are thought best where the length is one third more than the depth. The dimensions must be exactly computed by the engineers, so that the size of the camp may be proportioned to the number of troops. A camp which is too confined will not permit the troops to perform their movements with freedom, and one which is too extensive divides them too much. There are three methods of entrenching a camp. The first is for the case when the army is on the march and will continue in the camp for only one night. They then throw up a slight parapet of turf and plant it with a row of palisades or caltrops of wood. The sods are cut with iron instruments. If the earth is held strongly together by the roots of the grass, they are cut in the form of a brick a foot and one half high, a foot broad and a foot and one half long. If the earth is so loose that the turf cannot be cut in this form, they run a slight trench round the camp, five feet broad and three feet deep. The earth taken from the trench forms a parapet on the inside and this secures the army from danger. This is the second method. [ An instrument with four points so designed that when any three of them are on the ground the fourth projects upward. These are extensively used today for antitank barriers.]

“But permanent camps, either for summer or winter, in the neighborhood of an enemy, are fortified with greater care and regularity. After the ground is marked out by the proper officers, each century receives a certain number of feet to entrench. They then range their shields and baggage in a circle about their own colors and, with. out other arms than their swords, open a trench nine, eleven or thirteen feet broad. Or, if they are under great apprehensions of the enemy, they enlarge it to seventeen feet (it being a general rule to observe odd numbers). Within this they construct a rampart with fascines or branches of trees well fastened together with pickets, so that the earth may be better supported. Upon this rampart they raise a parapet with battlements as in the fortifications of a city. The centurions measure the work with rods ten feet long and examine whether every one has properly completed the proportion assigned to him. The tribunes likewise inspect the work and should not leave the place till the whole is finished. And that the workmen may not be suddenly interrupted by the enemy, all the cavalry and that part of the infantry exempted by the privilege of their rank from working, remain in order of battle before the entrenchment to be ready to repel any assault.

setting up a camp

“The first thing to be done after entrenching the camp, is to plant the ensigns, held by the soldiers in the highest veneration and respect, in their proper places. After this the praetorium is prepared for the general and his lieutenants, and the tents pitched for the tribunes, who have soldiers particularly appointed for that service and to fetch their water, wood, and forage. Then the legions and auxiliaries, cavalry and infantry, have the ground distributed to them to pitch their tents according to the rank of the several corps. Four foot-soldiers of each century and four troopers of each troop are on guard every night. As it seemed impossible for a sentinel to remain a whole night on his post, the watches were divided by the hourglass into four parts, that each man might stand only three hours. All guards are mounted by the sound of trumpet and relieved by the sound of cornet. The tribunes choose proper and trusty men to visit the different posts and report to them whatever they find amiss. This is now a military office and the persons appointed to it are called officers of the rounds.

“The cavalry furnish the grand guards at night and the outposts by day. They are relieved every morning and afternoon because of the fatigue of the men and horses. It is particularly incumbent upon the general to provide for the protection of the pastures and.of the convoys of grain and other provisions either in camp or garrison, and to secure wood, water and forage against the incursions of the enemy. This can only be effected by posting detachments advantageously in the cines or walled castles on the roads along which the convoys advance. And if no ancient fortifications are to be met with, small forts must be built in proper situations, surrounded with large ditches, for the reception of detachments of horse and foot, so that the convoys will be effectually protected. For an enemy will hardly venture far into a country where he knows his adversary's troops are so disposed as to be ready to encompass him on all sides.

Roman Army on the March in the 2nd Century B.C.

Polybius wrote in “History” Book 6: “In breaking up the camp the following order is observed. When the first signal is made, the soldiers all take down the tents, and collect the baggage. No tent, however, is at any time either set up or taken down until those of the consul and the tribunes are first set up, or first removed. Upon the second signal the baggage is placed upon the beasts of burden; and at the third, the foremost of the troops begin their march, and the whole camp is put in motion. In the van are usually placed the extra-ordinaries; and after these the right wing of the allies, which is followed by the baggage of both these bodies. Next to these marches the first of the Roman legions, with its baggage also behind it. The second legion follows; having behind it likewise both its own baggage, and the baggage of the allies, who are in the rear; for the rear of all the march is closed with the left wing of the allies. The cavalry marches sometimes in the rear of the respective bodies to which it belongs; and sometimes on the flanks of the beasts that are loaded with the baggage; keeping them together in due order, and covering them from insult. When an attack is expected to be made upon the rear, the extra-ordinaries of the allies, instead of leading the van, are posted in the rear. In all the other parts the disposition remains the same. [Source: Polybius (c.200-after 118 B.C.), Rome at the End of the Punic Wars, “History” Book 6. From: Oliver J. Thatcher, ed., “The Library of Original Sources” (Milwaukee: University Research Extension Co., 1907), Vol. III: The Roman World, pp. 166-193]

“Of the two legions, and the two wings of the allies, those that are on one day foremost in the march, on the following day are placed behind; that, by thus changing their rank alternately all the troops may obtain the same advantage in their turn, of arriving first at water and at forage. There is also another disposition which is used when any immediate danger threatens, and the march is made through an open country. At such times, the hastati, the principes, and the triarii, are ranged in three parallel lines, each behind the other, with the baggage of the hastati in the front. Behind the hastati is placed the baggage of the principes, who are followed likewise by that of the triarii; so that the baggage and the several bodies are mingled in alternate order. The march being thus disposed, the troops, as soon as an attack is made, turning either to the left or to the right, advance forwards from the baggage towards that side upon which the enemy appears. And thus, in a moment of time, and by one single movement, the whole army is formed at once in order of battle; except only that the hastati are perhaps obliged to make an evolution; and the beasts of burden also, with all those that attend upon the baggage, being now thrown into the rear of all the troops, are covered by them from all danger.

“At the end of a march, when the army arrives near the place of their encampment, a tribune and some centurions, who are appointed always for this purpose, advance before the rest. And having surveyed the whole ground upon which the encampment is to be made, they first determine the place of the consular tent, and on which side of it the legions may most commodiously be lodged. When this is done, they measure out the space that is allotted for the consul; and then draw a line for the place of the tents of the tribunes; and parallel to it another line, below which the legions are to be encamped. In the same manner also the several portions of the ground, which lies on the other side of the consular tent, and which we have already particularly described, are ascertained by lines. And as the distances are fixed, and well known by use, the admeasurement of the whole is easy, and soon completed. Four ensigns are then planted in the ground, the first in the place in which the tent of the consul is to be set up; the second, on that side of the consular ground which has been chosen for the front of the camp; the third in the middle of the line that is designed for the tents of the tribunes; and the last upon the other parallel line below which the legions are to be encamped. These ensigns are all of a purple color; that of the consul excepted, which is white. The portions on the other side of the consular ground are sometimes marked by simple pikes fixed in the ground, and sometimes by ensigns of some different color. Last of all, the several streets are drawn out by measure, and pikes also planted to denote the limits of each particular street.

river crossing constructed by the engineering corps on Trajan's column

“The necessary effect of this method is, that when the troops upon their march approach so near as to discover the place of their encampments, they are able to discern at once all the different parts of the camp; being taught by the ensign of the consul to point out and distinguish all the rest. And as they all occupy the same place always in the camp, so that each man knows in what particular street, and in what part also of the street, he is going to be lodged, their entrance very much resembles that of a body of soldiers into their own native city. For as these, already knowing, both in general and in particular, the quarters of the city in which their habitations stand, turn aside immediately from the gates, and arrive at their several houses without mistake; just so it happens in the Roman camp. It is to this facility indeed that the Romans chiefly attend upon such occasions; and, for the sake of obtaining it, pursues contrary a method to that of the Greeks. For the Greeks, when they encamp, consider principally the natural strength of the place that is chosen, and accommodate their disposition to it; being partly studious to avoid the labor of throwing up an entrenchment; and partly persuaded also, that fortifications raised by art are always less secure than those that are made by nature. In compliance, therefore, with what the nature of the ground demands, they not only are obliged to give every kind of figure to their camp, but to vary also the position of the several parts, as the place for each is favorable or improper. And from hence it happens that the soldier never knows with certainty either his own place in the camp, or that of the body to which he belongs. But the Romans willingly submit to the task of making an entrenchment, and to other painful works, for the sake of the advantage that is found, in employing a method which is never changed, and which renders all the parts of the camp familiar to the army.

Roman Army on the March in the A.D. 1st Century

Josephus (A.D. 37- after 93) wrote: “When, after this, they are gone out of their camp, they all march without noise, and in a decent manner, and every one keeps his own rank, as if they were going to war. The footmen are armed with breastplates and head-pieces, and have swords on each side; but the sword which is upon their left side is much longer than the other, for that on the right side is not longer than a span. Those foot-men also that are chosen out from the rest to be about the general himself have a lance and a buckler, but the rest of the foot soldiers have a spear and a long buckler, besides a saw and a basket, a pick-axe and an axe, a thong of leather and a hook, with provisions for three days, so that a footman hath no great need of a mule to carry his burdens. The horsemen have a long sword on their right sides, axed a long pole in their hand; a shield also lies by them obliquely on one side of their horses, with three or more darts that are borne in their quiver, having broad points, and not smaller than spears. They have also head-pieces and breastplates, in like manner as have all the footmen. And for those that are chosen to be about the general, their armor no way differs from that of the horsemen belonging to other troops; and he always leads the legions forth to whom the lot assigns that employment. [Source: Flavius Josephus (37- after 93 A.D.), “The Jewish War, Book III, .5-6, translated by William Whiston]

“This is the manner of the marching and resting of the Romans, as also these are the several sorts of weapons they use. But when they are to fight, they leave nothing without forecast, nor to be done off-hand, but counsel is ever first taken before any work is begun, and what hath been there resolved upon is put in execution presently; for which reason they seldom commit any errors; and if they have been mistaken at any time, they easily correct those mistakes. They also esteem any errors they commit upon taking counsel beforehand to be better than such rash success as is owing to fortune only; because such a fortuitous advantage tempts them to be inconsiderate, while consultation, though it may sometimes fail of success, hath this good in it, that it makes men more careful hereafter; but for the advantages that arise from chance, they are not owing to him that gains them; and as to what melancholy accidents happen unexpectedly, there is this comfort in them, that they had however taken the best consultations they could to prevent them.

soldiers on Trajan's Column

“Now they so manage their preparatory exercises of their weapons, that not the bodies of the soldiers only, but their souls may also become stronger: they are moreover hardened for war by fear; for their laws inflict capital punishments, not only for soldiers running away from the ranks, but for slothfulness and inactivity, though it be but in a lesser degree; as are their generals more severe than their laws, for they prevent any imputation of cruelty toward those under condemnation, by the great rewards they bestow on the valiant soldiers; and the readiness of obeying their commanders is so great, that it is very ornamental in peace; but when they come to a battle, the whole army is but one body, so well coupled together are their ranks, so sudden are their turnings about, so sharp their hearing as to what orders are given them, so quick their sight of the ensigns, and so nimble are their hands when they set to work; whereby it comes to pass that what they do is done quickly, and what they suffer they bear with the greatest patience. Nor can we find any examples where they have been conquered in battle, when they came to a close fight, either by the multitude of the enemies, or by their stratagems, or by the difficulties in the places they were in; no, nor by fortune neither, for their victories have been surer to them than fortune could have granted them. In a case, therefore, where counsel still goes before action, and where, after taking the best advice, that advice is followed by so active an army, what wonder is it that Euphrates on the east, the ocean on the west, the most fertile regions of Libya on the south, and the Danube and the Rhine on the north, are the limits of this empire? One might well say that the Roman possessions are not inferior to the Romans themselves.

“This account I have given the reader, not so much with the intention of commending the Romans, as of comforting those that have been conquered by them, and for the deterring others from attempting innovations under their government. This discourse of the Roman military conduct may also perhaps be of use to such of the curious as are ignorant of it, and yet have a mind to know it. I return now from this digression.

“But as Vespasian had a great mind to fall upon Galilee, he marched out of Ptolemais, having put his army into that order wherein the Romans used to march. He ordered those auxiliaries which were lightly armed, and the archers, to march first, that they might prevent any sudden insults from the enemy, and might search out the woods that looked suspiciously, and were capable of ambuscades. Next to these followed that part of the Romans which was completely armed, both footmen ,and horsemen. Next to these followed ten out of every hundred, carrying along with them their arms, and what was necessary to measure out a camp withal; and after them, such as were to make the road even and straight, and if it were any where rough and hard to be passed over, to plane it, and to cut down the woods that hindered their march, that the army might not be in distress, or tired with their march. Behind these he set such carriages of the army as belonged both to himself and to the other commanders, with a considerable number of their horsemen for their security. After these he marched himself, having with him a select body of footmen, and horsemen, and pikemen. After these came the peculiar cavalry of his own legion, for there were a hundred and twenty horsemen that peculiarly belonged to every legion. Next to these came the mules that carried the engines for sieges, and the other warlike machines of that nature. After these came the commanders of the cohorts and tribunes, having about them soldiers chosen out of the rest. Then came the ensigns encompassing the eagle, which is at the head of every Roman legion, the king, and the strongest of all birds, which seems to them a signal of dominion, and an omen that they shall conquer all against whom they march; these sacred ensigns are followed by the trumpeters. Then came the main army in their squadrons and battalions, with six men in depth, which were followed at last by a centurion, who, according to custom, observed the rest. As for the servants of every legion, they all followed the footmen, and led the baggage of the soldiers, which was borne by the mules and other beasts of burden. But behind all the legions carne the whole multitude of the mercenaries; and those that brought up the rear came last of all for the security of the whole army, being both footmen, and those in their armor also, with a great number of horsemen.”

Trajan's Column

Image Sources: Wikimedia Commons

Text Sources: Internet Ancient History Sourcebook: Rome ; Internet Ancient History Sourcebook: Late Antiquity ; Forum Romanum ; “Outlines of Roman History” by William C. Morey, Ph.D., D.C.L. New York, American Book Company (1901), \~\; “The Private Life of the Romans” by Harold Whetstone Johnston, Revised by Mary Johnston, Scott, Foresman and Company (1903, 1932) |+|; BBC Ancient Rome ; Perseus Project - Tufts University; ; MIT, Online Library of Liberty, ; Metropolitan Museum of Art, National Geographic, Smithsonian magazine, New York Times, Washington Post, Los Angeles Times, Live Science, Discover magazine, Times of London, Natural History magazine, Archaeology magazine, The New Yorker, Encyclopædia Britannica, "The Discoverers" [∞] and "The Creators" [μ]" by Daniel Boorstin. "Greek and Roman Life" by Ian Jenkins from the British Museum.Time, Newsweek, Wikipedia, Reuters, Associated Press, The Guardian and various books and other publications.

Last updated October 2018

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