The Gallic Wars of 58 to 51 BCE, in which the Roman proconsul Julius Caesar reduced the independent Celtic world of Gaul to a network of Roman provinces, were among the longest and most difficult military campaigns of the Roman Republic. The Celtic resistance to the Roman invasion was fierce, often brilliantly led, and at times brought Caesar to the brink of disaster. To follow the Celtic encounter with Rome is to recognize that the conquest of Gaul was not a Roman walkover but a long, brutal, and uncertain struggle, in which the Celtic tribes of Gaul, often fighting separately and sometimes in coalition, inflicted serious defeats on the Roman legions and very nearly succeeded in throwing the invader back across the Alps. The story of Celtic resistance to the Gallic Wars is part of the broader history of the Celtic civilization and is essential to understanding the end of the independent Celtic world on the continent.
The Celtic World on the Eve of the Conquest
On the eve of Caesar’s proconsulship in 58 BCE, the Celtic world of Gaul was a complex patchwork of tribes and tribal confederations, each with its own territory, its own leaders, and its own political traditions. Caesar himself, in the opening chapters of the De Bello Gallico, divides the Celtic peoples of Gaul into three main groupings: the Aquitani in the southwest, the Gauls proper, or Celts, in the central and western regions, and the Belgae in the north, a mixed Celtic and Germanic people who had crossed the Rhine in the previous centuries. The political organization of the Celtic tribes of Gaul varied considerably. Some tribes, like the Remi, were ruled by a council of elders, with a chief magistrate elected from among them. Other tribes, like the Arverni, were ruled by hereditary chiefs, often of royal blood, who held extensive powers in war and peace. The Celtic tribes had long experience of diplomacy, alliance, and warfare with one another, and they were familiar with the Romans through the long history of contact that had followed the Roman conquest of the southern Gaulish coast in the second century BCE.
The Helvetii and the Opening Campaign
The opening campaign of the Gallic Wars was Caesar’s intervention against the Helvetii, a Celtic people of the Swiss plateau who in 58 BCE attempted to migrate westward into the territory of the Santones and other Gallic tribes. The migration, if it had succeeded, would have caused political chaos in western Gaul, and it would have brought the Helvetii into conflict with the Aedui, a long-standing Roman ally. Caesar’s response to the Helvetii was swift and decisive. He hurried north from his base in the Roman province of Gallia Transalpina, caught the Helvetian column in the process of crossing the Saône, and inflicted a series of defeats on the Helvetian rearguard. The decisive engagement, the battle of Bibracte, was fought near the Helvetian oppidum of the same name, and it ended in a Roman victory that left the Helvetian migration in ruins.
The Belgae and the Northern Campaign
The campaign of 57 BCE took Caesar into the territory of the Belgae, the mixed Celtic and Germanic peoples of northern Gaul. The Belgae had united in response to Caesar’s invasion, and they raised a great army that the Romans met on the River Axona, the modern Aisne. The campaign against the Belgae saw some of the fiercest fighting of the Gallic Wars. The battle against the Nervii, perhaps the most warlike of the Belgic tribes, was fought on the banks of the Sambre and came close to a Roman disaster. Caesar’s legions, taken by surprise during the construction of a marching camp, were overrun by the Nervian attack, and only Caesar’s personal intervention, rallying the defenders and committing his last reserves, saved the Roman army from destruction.
The Veneti and the Atlantic Campaign
The campaign of 56 BCE took Caesar to the Atlantic coast of Gaul, where the maritime Veneti of Brittany had risen in revolt. The Veneti, a powerful seafaring tribe whose territory included the whole of the Breton peninsula, controlled the tin trade from Britain and were accustomed to using the tides and storms of the Atlantic to extend their reach along the coast. Caesar responded with a combined land and naval campaign, building a fleet of galleys on the Loire and engaging the Veneti in a decisive naval battle off the coast of Brittany. The Roman fleet used a special weapon, a hooked grappling iron that could seize an enemy ship’s rigging and allow the Roman marines to board. The Roman fleet used these hooks to lock onto the Veneti ships and then to board and capture them one by one. The defeat of the Veneti was a decisive moment in the conquest of Gaul, and it demonstrated that the Romans were willing to extend their war effort to every corner of the Celtic world.
The Crises of 55 and 54 BCE
The campaigns of 58 to 56 BCE had given Caesar control of most of Gaul, but the years 55 and 54 saw two serious crises that nearly broke his power. The first was the campaign against the Usipetes and the Tencteri, two Germanic peoples who had crossed the Rhine into Gaul. Caesar, having failed to negotiate a settlement, attacked the Germanic camp while his ambassadors were still negotiating, a clear violation of the laws of war that shocked even some of his Roman supporters. The year 54 BCE saw a far more serious crisis. An attack by the Eburones, a Belgic tribe of the lower Rhine, on a Roman legion under the command of Caesar’s legate Titurius Sabinus led to the destruction of the legion and the death of both Sabinus and his fellow officer Cotta. The destruction of the Roman cohorts in the Ardennes was one of the worst Roman defeats of the Gallic Wars, and it came close to triggering a general revolt.
The Great Revolt of 52 BCE
The climax of the Celtic resistance came in 52 BCE with the great coalition of Gallic tribes led by Vercingetorix, the young Arvernian nobleman who succeeded in uniting a coalition that had previously been divided. The strategy of the revolt, the burning of the towns and crops to deny them to the Romans and the withdrawal to a series of fortified positions, very nearly succeeded. Caesar suffered serious reverses, including the humiliating defeat at Gergovia, and he was forced to adopt increasingly brutal measures, including the enslavement of defeated populations and the mass execution of prisoners, in order to break the Celtic resistance. The revolt was eventually broken by the great siege of Alesia, in which Caesar trapped Vercingetorix and his army behind massive circumvallation works and forced them to surrender. The fall of Alesia marked the effective end of independent Celtic political life on the continent, and the surrender of Vercingetorix was the symbolic end of free Gaul.
The Celtic Leaders of the Resistance
The Celtic resistance to Caesar’s Gallic Wars was led by a remarkable gallery of tribal chiefs. Dumnorix of the Aedui, who opposed his brother Diviciacus and the pro-Roman policy of the Aeduan senate, was an early and troublesome opponent of Caesar. Indutiomarus of the Treveri, who led the revolt of 53 BCE, was a chief of great personal courage who kept up the resistance in the northeast long after the rest of Gaul had been subdued. Ambiorix of the Eburones, who organized the destruction of the Roman cohorts in the Ardennes, was one of the few Celtic leaders to inflict a major defeat on Caesar in open battle. Commius of the Atrebates, originally a Roman ally, broke with Caesar in 52 BCE and joined the great coalition. These and many other Celtic leaders of the resistance are treated in the related pages on the famous Celtic warriors and leaders of the encounter with Rome.
The Legacy of Celtic Resistance
The Celtic resistance to Caesar’s Gallic Wars left a deep mark on both Celtic and Roman memory. On the Celtic side, the great leaders of the resistance became heroes of folk tradition, and their names were preserved in medieval Welsh and Irish literature as well as in the oral traditions of Gaul. On the Roman side, the conquest of Gaul became the foundation of Caesar’s political career, and the De Bello Gallico became one of the most widely read works of Latin prose. The contrast between the Roman and the Celtic accounts of the wars, and the way that the conquest of Gaul was remembered in both traditions, is one of the central themes of the Celtic encounter with Rome.
Related Topics
- The battle of Alesia and the fall of Vercingetorix is examined in detail
- The famous Celtic warriors and leaders of the resistance to Rome
- The Celtic battle tactics used against the Romans
- The Celtic weapons and armor of the period
- The Iron Age Celtic expansion provides the background