Romanmilitary engineering was of a scale and frequency far beyond that of its contemporaries. Indeed, military engineering was in many ways endemic in Roman military culture, as demonstrated by each Roman legionary having as part of his equipment a shovel, alongside his gladius (sword) and pila (javelins).
Workers, craftsmen, and artisans, known collectively as fabri, served in the Roman military. Descriptions of early Roman army structure (initially by phalanx, later by legion) attributed to king Servius Tullius state that two centuriae of fabri served under an officer, the praefectus fabrum.[citation needed]
Roman military engineering took both routine and extraordinary forms, the former a part of standard military procedure, and the latter of an extraordinary or reactive nature.
Each Roman legion had a legionary fort as its permanent base. However, when on the march, particularly in enemy territory, the legion would construct a rudimentary fortified camp or castra, using only earth, turf and timber. Camp construction was the responsibility of engineering units to which specialists of many types belonged, officered by architecti (engineers), from a class of troops known as immunes who were excused from regular duties. These engineers would requisition manual labour from the soldiers at large as required. A legion could throw up a camp under enemy attack in a few hours. The names of the different types of camps apparently represent the amount of investment: tertia castra, quarta castra: "a camp of three days", "four days", etc.
The engineers built bridges from timber and stone. Some Roman stone bridges survive. Stone bridges were made possible by the innovative use of keystonearches. One notable example was Julius Caesar's Bridge over the Rhine River. This bridge was completed in only ten days and is conservatively estimated to have been more than 100 m (328feet) long.[1][2] The construction was deliberately over-engineered for Caesar's stated purpose of impressing the Germanic tribes. Caesar writes in his War in Gaul that he rejected the idea of simply crossing in boats because it "would not be fitting for my own prestige and that of Rome" (at the time, he did not know that the Germanic tribes, with little knowledge of engineering, had already withdrawn from the area upon his arrival), and because a bridge would emphasize that Rome could travel wherever she wished. Caesar was able to cross over the completed bridge and explore the area uncontested, before crossing back over the subsequently dismantled bridge. Caesar related in War in Gaul that when he "sent messengers to the Sugambri to demand the surrender of those who had made war on me and on Gaul, they replied that the Rhine was the limit of Roman power". The bridge was intended to show otherwise.
Although most Roman siege engines were adaptations of earlier Greek designs, the Romans were adept at engineering them swiftly and efficiently, as well as innovating variations such as the repeating ballista. The 1st century BC army engineer Vitruvius describes in detail many of the Roman siege machines in his manuscript De architectura.
When invading enemy territories, the Roman army would often construct roads as it went, to allow swift reinforcement and resupply, or for easy retreat if necessary. Roman road-making skills were such that some survive today. Michael Grant credits the Roman building of the Via Appia with winning them the Second Samnite War.[3]
Civilian engineering by military troops
Greco-Roman Pentaspastos ("Five-pulley-crane"), a medium-sized variant (ca. 450 kg load)
When soldiers were not engaged in military campaigns, the legions had little to do, while costing the Roman state large sums of money. Thus, soldiers were involved in building civilian works to keep them well accustomed to hard physical labour and out of mischief, since it was believed that idle armies were a potential source of mutiny.
Soldiers were put to use in the construction of roads, town walls, the digging of canals, drainage projects, aqueducts, harbours, and even in the cultivation of vineyards.
Soldiers were used in mining operations such as building aqueducts needed for prospecting for metal veins, activities such as hydraulic mining, and building reservoirs to hold water at the minehead.
Reactive and extraordinary engineering
The knowledge and experience learned through routine engineering lent itself readily to extraordinary engineering projects. In such projects, Roman military engineering greatly exceeded that of its contemporaries in imagination and scope.
One notable project was the circumvallation of the entire city of Alesia and its Celtic leader Vercingetorix, within a massive double-wall – one inward-facing to prevent escape or offensive sallies, and one outward-facing to prevent attack by Celtic reinforcements. This wall is estimated to have been over 20km (12mi) long.
A second example is the massive ramp built using thousands of tons of stones and beaten earth up to the invested city of Masada during the Jewish Revolt. The siege works and the ramp remain in a remarkable state of preservation.
The Roman legion, the largest military unit of the Roman army, was composed of Roman citizens serving as legionaries. During the Roman Republic the manipular legion comprised 4,200 infantry and 300 cavalry. After the Marian reforms in 107 BC, the legions were formed of 5,200 men and were restructured around 10 cohorts, the first cohort being double strength. This structure persisted throughout the Principate and middle Empire, before further changes in the fourth century resulted in new formations of around 1,000 men.
The Gallic Wars were waged between 58 and 50 BC by the Roman general Julius Caesar against the peoples of Gaul. Gallic, Germanic, and Brittonic tribes fought to defend their homelands against an aggressive Roman campaign. The Wars culminated in the decisive Battle of Alesia in 52 BC, in which a complete Roman victory resulted in the expansion of the Roman Republic over the whole of Gaul. Though the collective Gallic armies were as strong as the Roman forces, the Gallic tribes' internal divisions eased victory for Caesar. Gallic chieftain Vercingetorix's attempt to unite the Gauls under a single banner came too late. Caesar portrayed the invasion as being a preemptive and defensive action, but historians agree that he fought the wars primarily to boost his political career and to pay off his debts. Still, Gaul was of significant military importance to the Romans. Native tribes in the region, both Gallic and Germanic, had attacked Rome several times. Conquering Gaul allowed Rome to secure the natural border of the river Rhine.
The Roman legionary was a citizen soldier of the Roman army. These soldiers would conquer and defend the territories of ancient Rome during the late Republic and Principate eras, alongside auxiliary and cavalry detachments. At its height, Roman legionaries were viewed as the foremost fighting force in the Roman world, with commentators such as Vegetius praising their fighting effectiveness centuries after the classical Roman legionary disappeared.
Legio V Alaudae, sometimes also known as Legio V Gallica, was a legion of the Roman army founded in 52 BC by the general Gaius Julius Caesar. It was levied in Transalpine Gaul to fight the armies of Vercingetorix, and was the first Roman legion to comprise non-citizens. Historians disagree whether the legion was destroyed during the Batavian rebellion in AD 70, or during the First Battle of Tapae.
The Revolt of the Batavi took place in the Roman province of Germania Inferior between AD 69 and 70. It was an uprising against the Roman Empire started by the Batavi, a small but militarily powerful Germanic tribe that inhabited Batavia, on the delta of the river Rhine. They were soon joined by the Celtic tribes from Gallia Belgica and some Germanic tribes.
The Battle of Thapsus was a military engagement that took place on April 6, 46 BC near Thapsus. The forces of the Optimates, led by Quintus Caecilius Metellus Scipio, were defeated by the forces of Julius Caesar. It was followed shortly by the suicides of Scipio and his ally, Cato the Younger, the Numidian king Juba, and his Roman peer Marcus Petreius.
The Battle of Alesia or siege of Alesia was the climactic military engagement of the Gallic Wars, fought around the Gallic oppidum of Alesia in modern France, a major centre of the Mandubii tribe. It was fought by the Roman army of Julius Caesar against a confederation of Gallic tribes united under the leadership of Vercingetorix of the Arverni. It was the last major engagement between Gauls and Romans, and is considered one of Caesar's greatest military achievements and a classic example of siege warfare and investment; the Roman army built dual lines of fortifications—an inner wall to keep the besieged Gauls in, and an outer wall to keep the Gallic relief force out. The Battle of Alesia marked the end of Gallic independence in the modern day territory of France and Belgium.
Ariovistus was a leader of the Suebi and other allied Germanic peoples in the second quarter of the 1st century BC. He and his followers took part in a war in Gaul, assisting the Arverni and Sequani in defeating their rivals, the Aedui. They then settled in large numbers into conquered Gallic territory, in the Alsace region. They were defeated, however, in the Battle of Vosges and driven back over the Rhine in 58 BC by Julius Caesar.
In the Roman Republic and the Roman Empire, the Latin word castrum was a military-related term. In Latin usage, the singular form castrum meant 'fort', while the plural form castra meant 'camp'. The singular and plural forms could refer in Latin to either a building or plot of land, used as a fortified military base. In English usage, castrum commonly translates to "Roman fort", "Roman camp" and "Roman fortress". However, scholastic convention tends to translate castrum as "fort", "camp", "marching camp" or "fortress".
The Battle of Gergovia took place in 52 BC in Gaul at Gergovia, the chief oppidum of the Arverni. The battle was fought between a Roman Republican army, led by proconsul Julius Caesar, and Gallic forces led by Vercingetorix, who was also the Arverni chieftain. The Romans attempted to besiege Gergovia, but miscommunication ruined the Roman plan. The Gallic cavalry counterattacked the confused Romans and sent them to flight, winning the battle.
Roman siege engines were, for the most part, adapted from Hellenistic siege technology. Relatively small efforts were made to develop the technology; however, the Romans brought an unrelentingly aggressive style to siege warfare that brought them repeated success. Up to the first century BC, the Romans utilized siege weapons only as required and relied for the most part on ladders, towers and rams to assault a fortified town. Ballistae were also employed, but held no permanent place within a legion's roster, until later in the republic, and were used sparingly. Julius Caesar took great interest in the integration of advanced siege engines, organizing their use for optimal battlefield efficiency.
This is a chronology of warfare between the Romans and various Germanic peoples. The nature of these wars varied through time between Roman conquest, Germanic uprisings, later Germanic invasions of the Western Roman Empire that started in the late second century BC, and more. The series of conflicts was one factor which led to the ultimate downfall of the Western Roman Empire in particular and ancient Rome in general in 476.
The Battle of the Bagradas occurred near the Bagradas River in what is now Tunisia on 24 August and was fought between Julius Caesar's general Gaius Scribonius Curio and the Pompeian Republicans under Publius Attius Varus and King Juba I of Numidia. The result was a crushing defeat for the Caesarean forces and the death of Curio.
The military of ancient Rome was one of largest pre-modern professional standing armies that ever existed. At its height, protecting over 7,000 kilometers of border and consisting of over 400,000 legionaries and auxiliaries, the army was the most important institution in the Roman world. According to the Roman historian Livy, the military was a key element in the rise of Rome over "above seven hundred years" from a small settlement in Latium to the capital of an empire governing a wide region around the shores of the Mediterranean, or, as the Romans themselves said, mare nostrum, "our sea". Livy asserts:
Roman military personal equipment was produced in large numbers to established patterns, and used in an established manner. These standard patterns and uses were called the res militaris or disciplina. Its regular practice during the Roman Republic and Roman Empire led to military excellence and victory. The equipment gave the Romans a very distinct advantage over their "barbarian" enemies, especially so in the case of armour. This does not mean that every Roman soldier had better equipment than the richer men among his opponents. Roman equipment was not of a better quality than that used by the majority of Rome's adversaries. Other historians and writers have stated that the Roman army's need for large quantities of "mass produced" equipment after the so-called "Marian Reforms" and subsequent civil wars led to a decline in the quality of Roman equipment compared to the earlier Republican era:
The production of these kinds of helmets of Italic tradition decreased in quality because of the demands of equipping huge armies, especially during civil wars...The bad quality of these helmets is recorded by the sources describing how sometimes they were covered by wicker protections, like those of Pompeius' soldiers during the siege of Dyrrachium in 48 BC, which were seriously damaged by the missiles of Caesar's slingers and archers.
It would appear that armour quality suffered at times when mass production methods were being used to meet the increased demand which was very high the reduced size cuirasses would also have been quicker and cheaper to produce, which may have been a deciding factor at times of financial crisis, or where large bodies of men were required to be mobilized at short notice, possibly reflected in the poor-quality, mass produced iron helmets of Imperial Italic type C, as found, for example, in the River Po at Cremona, associated with the Civil Wars of AD 69 AD; Russell Robinson, 1975, 67
Up until then, the quality of helmets had been fairly consistent and the bowls well decorated and finished. However, after the Marian Reforms, with their resultant influx of the poorest citizens into the army, there must inevitably have been a massive demand for cheaper equipment, a situation which can only have been exacerbated by the Civil Wars...
The Battle of Vosges also referred to as the Battle of Vesontio was fought on September 14, 58 BC between the Germanic tribe of the Suebi, under the leadership of Ariovistus, and six Roman legions under the command of Gaius Julius Caesar. This encounter is the third major battle of the Gallic Wars. Germanic tribes crossed the Rhine, seeking a home in Gaul.
Caesar's bridges across the Rhine, the first two bridges on record to cross the Rhine river, were built by Julius Caesar and his legionaries during the Gallic War in 55 BC and 53 BC. Strategically successful, they are also considered masterpieces of military engineering.
The Imperial Roman Army was the military land force of the Roman Empire from 27 BC to 476 AD, and the final incarnation in the long history of the Roman army. This period is sometimes split into the Principate and the Dominate (284–476) periods.
The Roman army of the late Republic refers to the armed forces deployed by the late Roman Republic, from the beginning of the first century BC until the establishment of the Imperial Roman army by Augustus in 30 BC.
Roman infantry tactics are the theoretical and historical deployment, formation, and manoeuvres of the Roman infantry from the start of the Roman Republic to the fall of the Western Roman Empire. The original Roman army was made up of hoplites, whose main strategy was forming into a phalanx. By the early third century BCE, the Roman army would switch to the maniple system, which would divide the Roman army into three units, hastati, principes, and triarii. Later, in 107BCE, Marius would institute the so-called Marian reforms, creating the Roman legions. This system would evolve into the Late Roman Army, which utilized the comitatenses and limitanei units to defend the Empire.
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