The Battle of the Sabis, also (arguably erroneously) known as the Battle of the Sambre or the Battle against the Nervians (or Nervii), was fought in 57 BC near modern Saulzoir in Northern France, between Caesar's legions and an association of Belgae tribes, principally the Nervii. Julius Caesar, commanding the Roman forces, was surprised and nearly defeated. According to Caesar's report, a combination of determined defence, skilled generalship, and the timely arrival of reinforcements allowed the Romans to turn a strategic defeat into a tactical victory. Few primary sources describe the battle in detail, with most information coming from Caesar's own report on the battle from his book, Commentarii de Bello Gallico. Little is therefore known about the Nervii perspective on the battle.
During the winter of 58–57 BC rumours came to Caesar's ears that the Belgae tribes were forming a union because they feared possible Roman interference in their affairs.[3] The union included the Bellovaci, Suessiones, Nervii, Atrebates, Ambiani, Morini, Menapii, Caleti, Veliocasses, Viromandui, Aduatuci, Condrusi, Eburones, Caeroesi, and Paemani tribes, and was under the leadership of Galba, a king of the Suessiones.[4] These reports provided Caesar with a good pretext for conquering more than Gaul "itself", and for this, he raised two legions in Cisalpine Gaul (XIII and XIV)[5] and convinced the Remi tribe to side with him.[6]
In response, the other Belgae and Celtic tribes had attacked Bibrax (the oppidum of the Remi, situated near the river Aisne). Caesar countered by defending the oppidum and winning an action at the Aisne. In the face of this and because of shortage of provisions, the union collapsed and tribal armies retreated to their own lands, with the agreed future intention of coming to the support of any tribe invaded by the Romans. Caesar continued his advance and tribes surrendered one by one. However, four tribes, the Nervii, the Atrebates, the Aduatuci, and the Viromandui refused to submit.[7]
The Ambiani told Caesar that the Nervii were the most hostile of the Belgae to Roman rule. A fierce and brave tribe, they did not allow the import of luxury items as they believed these had a corrupting effect and probably feared Roman influence. They had no intention of entering peace negotiations with the Romans. Caesar would move on them next.[8]
Forces
As with all ancient battles, estimates of the forces available to both sides will always be a matter of some speculation. A Roman legion during this era had a theoretical strength of some 4,800 fighting men with additional auxiliary forces (usually skirmishers and cavalry). Eight Roman legions plus an unknown number of auxiliary (skirmishers: archers, slingers and javelinmen) and allied cavalry are recorded to have taken part in the battle. It is not known if the legions were at full strength, but a reasonable estimate for Caesar's army might be in the range of 30,000–45,000 fighting men (including skirmishers and cavalry). The 30,000–45,000 range does not include non-combatants, although, in this case, they participated in the fighting during the final phase of the battle. A legion was usually accompanied by some 1,200 non-combatants (theoretically) so their numbers could have been 9,000-10,000 men.
Caesar claims he had earlier received intelligence from the Remi that the various tribes of the Belgae had promised to contribute a total of 300,000 fighting men. According to Caesar the Remi estimates of the men promised by the four tribes now left to oppose Caesar were: 50,000 Nervii, 15,000 Atrebates, 10,000 Veromandui and 19,000 Aduatuci.[4] If these figures were reliable it would mean that Caesar was immediately faced with a maximum of 75,000 men, as the Aduatuci were still en route. Promises are not always kept so it is probable the actual number was smaller than this, though still high enough to outnumber the legionaries. Drawing on demographic data, Hans Delbrück estimated a maximum of 30,000 combatants for the three tribes fighting at the Sabis, and probably far less.[1]
Order of battle
Battlefield if the "Sabis" matches the River Selle.Battlefield if the "Sabis" matches the Sambre.
Roman Republic – Julius Caesar's eight legions: VII, VIII, IX Triumphalis, X Equestris, XI, XII Victrix, XIII, XIV – auxiliaries: slingers, archers, javelinmen and cavalry. The IX and X legions formed the left flank, the VIII and the XI were in the centre, and the VII and XII were on the right.
The Belgae attacked with the Atrebates forming the right wing, the Viromandui in the centre, and the Nervi on the left.
Traditionally it was believed that the battle was fought on the banks of the river Sambre, near modern Aulnoye-Aymeries, but in 1955 Turquin showed that it was fought on the west bank of the river Selle, near modern Saulzoir.[9]
Before the battle
Caesar's legions had been marching in Nervian territory for three days, following an ancient road.[10] He learnt from prisoners that the Belgae were massing on the far side of the River Sabis, which was about 10 miles (16km) ahead. The Nervii had persuaded the Atrebates and the Veromandui to support them. The Aduatuci were marching to join them, but they did not arrive in time to take part in the battle. Their non-combatants had moved to a safe area screened by marshes, where an army could not approach.[11] The Belgae had made their preparations and were now waiting for the Romans.
Caesar sent forward experienced scouts to choose the next campsite.
He learnt from prisoners taken later that sympathisers in the ragtag of surrendered Belgae and other Gauls travelling with the army had gone to the Nervii and reported the disposition of his column. They reported that the individual legionary baggage trains were interspersed between the legions and that it would be easy to cut off the leading legion from the rest and destroy it before any support could reach it. It was believed this would intimidate the Romans into withdrawing. The Nervii, having traditionally always relied on infantry rather than cavalry, had over the years developed a technique of building dense, impenetrable hedges of briars and thorns set between young trees as a defence against the raids of surrounding tribes. These would obstruct Caesar's advance and help the attack. It was agreed that the signal for an attack was to be the appearance of the baggage train behind the first legion.[12] In doing this, the Nervii were intending to use what is recognisable today as the modern army doctrine of force concentration. As will be seen, their plan would be frustrated by Caesar.
Battle
The campsite was to be laid out on a hill which gently sloped down to the river. On the other side of the river there was another hill directly opposite, similarly sloping. The top of that hill was densely wooded but the lower part was open and sloped down to the river over a distance of 200 paces (roughly 300 metres (330yd)). The enemy was concealed inside the woods, but a few cavalry pickets could be seen in the open area by the river. The river was very wide, but only about threefeet (onemetre) deep.[13]
At some point on his march to the Sabis, Caesar reorganised the column and reverted to his usual tactic of leading his forces with six legions in light marching order. Behind them was the baggage column of the entire army, followed by the newly recruited legions, XIII and XIV. Caesar does not say whether this change was fortuitous or was made in response to the intelligence received. While Caesar's force began to set up camp on the slope running down to the river, his cavalry, together with slingers and archers, was ordered to cross the river to reconnoiter. This developed into a skirmish with the few troops of Belgic cavalry that had been observed on the far side. Caesar describes the enemy cavalry as sallying repeatedly from the woods at the top of the hill and says his cavalry did not dare follow them in when they retreated. He does not elaborate further so it will never be known if the Nervii were trying to entice the skirmishers onto their hidden position or holding them in play on the slopes in preparation for the planned rush.
Meanwhile, the legions had started arriving at the camp site and began to build its fortifications. The Belgae, waiting for the baggage train to appear, gradually found themselves faced with not one legion, but six. Their plan of piecemeal destruction had to be abandoned, but they must have believed their numbers more than adequate to deal with their enemy.
Ambush
As the Roman baggage train came into view, the Belgic force suddenly rushed out of the trees and surprised their opponents, overwhelming the Roman cavalry. They crossed the shallow river at full speed and charged up the hill against the legions setting up camp, giving them no time to get into battle formation. It seemed to Caesar that the Nervii came on with incredible speed, all at once pouring out of the trees, charging across the river and overrunning his legionaries.[14]
Taken by surprise, Caesar had to rapidly give orders to sound the alarm both by raising the battle-standard and by trumpet, get his men away from construction work, recall the wood-cutting parties, and try to get his legions into some semblance of order. There was very little time and much had to be left undone. Two things, though, saved the legions from being immediately routed—firstly, the knowledge and experience of the soldiers (which meant that they could decide for themselves what to do without waiting for orders) and secondly, Caesar had previously ordered all legion commanders to stay with their legions during the setting up of the camp.[15]
Caesar went wherever he was needed, giving only essential orders and eventually found himself on the left wing with Legion X. Seeing that the enemy were within range of the Romans he gave the order to hurl a volley of pilae. Going to another part of the field, he found his men already fighting. The men had run from their building tasks to fall into ranks but many did not even have time to put on their helmets or take the covers off their shields.[16] The legionaries had no opportunity to group with their own cohorts and instead congregated around the first friendly standard they saw.[17] Caesar states that the hedges were a considerable obstruction to his men during the battle, although he does not specify their locations on the field,[18] but the woody hilltop is the one place we can infer their presence.
The soldiers of legions X Equestris and IX Triumphalis on the left flank, having thrown their pilae at their Atrebates opponents, charged. They threw the enemy back and drove them into the river, killing many. The Romans crossed the river and found themselves on disadvantageous or uneven ground, but although the Atrebates regrouped and launched a counter-attack, the Romans put them to flight a second time. Further along, in the centre, two legions, XI and VIII, having checked the Viromandui with whom they were engaged, pushed them from the higher ground into the river.
However, as these four legions pushed their opponents back, the front and left of the camp was left undefended and a gap opened up in the Roman line. A compact column of Nervii under Boduognatus (the overall commander of the Belgae) rushed through the opening. Part of the column turned to encircle the two legions holding the right flank; the rest continued upwards to attack the higher part of the camp.[19]
Crisis
Meanwhile, the routed Roman cavalry and skirmishers were just straggling into camp when they found themselves face to face with the Nervii – they ran again. Camp followers further up the hill by the camp's back gate had observed the success of the Romans at the river and came down in the hope of plunder, but noticed the Nervii in the camp and also ran. People accompanying the baggage train just arriving were horrified at the sight before them and panicked as well. Even the usually-dependable Treveri cavalry arriving to support the Romans looked at the seemingly hopeless situation and promptly turned for home to report the disaster.[20]
After encouraging Legion X Caesar went to the right wing. The situation seemed desperate. He could see that the men of XII Victrix were crammed so closely together into one mass by their standards that they could not fight effectively. All (six) centurions of the fourth cohort were dead, its standard bearer killed, and the standard missing. Of the remaining cohorts, almost all the centurions were either wounded or killed; Baculus,[21] the legion's primipilus, a fine soldier, had received so many minor and serious wounds that he could barely stand. The Nervii were attacking vigorously from lower ground and pressing at the front and both flanks. Caesar could see some men were shirking and trying to get to the rear; others were slowly ceasing effective resistance. There were no reserves. This was the crisis-point. He took a shield from a soldier at the rear and went to the first line. Calling his centurions by name, he ordered them to have the soldiers advance (signa inferre) and the maniples open up and extend. As he tells it, his arrival brought hope and boosted the soldiers’ morale. Every man was now keen to do well in front of his general. As a result, the enemy assault was checked slightly.[22]
Recovery
Caesar saw that Legion VII nearby was also hard-pressed. He ordered the tribunes to redeploy the two legions to gradually join and fight back to back. This further increased his men's confidence. By now, the legions escorting the baggage, having received a report of the action, had come on at double pace and the enemy could see them coming over the hill above the camp. Legion X, under legateLabienus, had overcome the Atrebates, crossed the river, and defeated the Belgic reserves. Now they seized the Belgic camp on the wooded hill. From the higher ground, Labienus could see that Caesar's right wing was in serious trouble. He ordered his men back across the river to attack the Nervii from the rear.[23]
Soon Legions XIII and XIV joined the fight. Caesar does not detail their actions, but they probably cleared the camp (as it was their nearest target) and went to the right to relieve the pressure on Legions XII and VII. This, coupled with the return of Legion X, transformed the situation. Seeing the position begin to stabilise, cavalry and skirmishers took heart and, keen to wipe out their earlier shame, started to fight in earnest. The camp followers joined in now that they could see their enemy's dismay. The entire Roman force was now fully committed.
At this point of the battle it is clear that Caesar's opposition had little hope of survival. They were being pushed closer and closer into a dense pack that was being surrounded by Caesar's men who were using projectile weapons to pick off their remaining forces. Using peltasts (a light infantry) equipped with slings and javelins, and with the help of archers, they unleashed a barrage of missiles at the closely packed Nervii. The last of them fought with ferocity and courage for they were continuing to retaliate with their spears and catching the Romans javelins and throwing them back at them. The Nervii hadn't used any other projectile type weapon except for spears. The Nervii warriors fought to the last, standing on the bodies of their slain comrades, and throwing the Romans’ own spears back at them. Eventually the few remaining Nervii broke and fled the field.
Caesar's opinion of the Nervii was that they had shown great fighting spirit in carrying an attack forward so vigorously on to difficult ground and in continuing to fight stubbornly when the tide of battle turned irretrievably against them.[24] Caesar talks of a grimly inspiring image of the last of the Nervii who were atop a mound of corpses of their own warriors and shouting in defiance towards the Romans, fighting till their last breath.[25] He goes on to say that they had outstanding courage, for they launched a surprise attack, crossed a river up its banks, then rushed on to attack all with a fighting spirit.[26] He glorifies his victory by stating how well his army did without having to be ordered to launch a counter-attack. It is probable that his soldiers were experienced veterans who were able to hold off their onslaught. He evidently mitigates his losses by not mentioning the Roman casualties, or conceding that they were in serious danger of defeat, as appears to have been the case. While Caesar appears to give a relatively frank account of the course of the battle, in The Conquest of Gaul, this remains one of the only primary sources. And since it was written by Caesar, much is unknown of the Nervii's perspective, such as the extent to which Boduognatus planned the attack and directed his forces during the battle.[27]
Casualties
The older men of the Nervii, described by Caesar as “senators”, came out of their hiding place in the marshland and surrendered. They said that their council had been reduced from 600 men to three and that of 60,000 fighting men there were barely 500 left. It is not entirely clear if this is a figure for the dead or if it includes wounded, nor is it clear if these are solely Nervii casualties or if the figure includes their allies. Caesar states that he spared the Nervii and ordered the surrounding tribes not to take advantage of their weakness.[28]
Caesar gives no indication of his own casualties.
Aftermath
The Aduatuci turned for home as soon as they heard about the defeat. They were subsequently defeated by Caesar and some 53,000 of them sold into slavery.[29][30]
In 54 BC Ambiorix persuaded the Nervii to join the Eburones after the latter had destroyed a legion and five cohorts under Sabinus and Cotta during the Ambiorix's revolt.[32]
During Vercingetorix's revolt (52 BC) the Nervii were only asked to supply 5,000 men to the forces raised by a confederation of over forty tribes.[33]
↑ Pierre Turquin ("La Bataille de la Selle (du Sabis) en l' An 57 avant J.-C." in Les Études Classiques 23/2 (1955), 113-156)
↑ Essentially the road that was later paved by the Romans and connected Samarobriva (Amiens) with Cologne, and is now often referred to as "Via Belgica". The position of Bronze Age and Iron Age tombs proves that it already existed in pre-Roman times.
↑ Shields were made of layers of wood and leather, then painted with casein-based paints. The shield was covered when not in use as a protection against rain.
Ambiorix was, together with Cativolcus, prince of the Eburones, leader of a Belgic tribe of north-eastern Gaul, where modern Belgium is located. In the nineteenth century Ambiorix became a Belgian national hero because of his resistance against Julius Caesar, as written in Caesar's Commentarii de Bello Gallico.
Year 57 BC was a year of the pre-Julian Roman calendar. Contemporaneously, in the Roman Republic, it was known as the Year of the Consulship of Lentulus and Metellus. The denomination 57 BC for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.
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 the 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 various 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 Nervii were one of the most powerful Belgic tribes of northern Gaul at the time of its conquest by Rome. Their territory corresponds to the central part of modern Belgium, including Brussels, and stretched southwards into French Hainault. During their first century BC Roman military campaign, Julius Caesar's contacts among the Remi stated that the Nervii were the most warlike of the Belgae. In times of war, they were known to trek long distances to take part in battles. Being one of the northerly Belgic tribes, with the Menapii to the west, and the Eburones to their east, they were considered by Caesar to be relatively uncorrupted by civilization. According to Tacitus they claimed Germanic descent. According to Strabo they were of Germanic origin.
Legio X Equestris, a Roman legion, was levied by Julius Caesar in 61 BC when he was the Governor of Hispania Ulterior. The Tenth was the first legion levied personally by Caesar and was consistently his most trusted. Legio X was famous in its day and throughout history, because of its portrayal in Caesar's Commentaries and the prominent role the Tenth played in his Gallic campaigns. Its soldiers were discharged in 45 BC. Its remnants were reconstituted, fought for Mark Antony and Octavian, disbanded, and later merged into X Gemina.
The Atrebates were a Belgic tribe of the Iron Age and the Roman period, originally dwelling in the Artois region.
The Belgae were a large confederation of tribes living in northern Gaul, between the English Channel, the west bank of the Rhine, and the northern bank of the river Seine, from at least the third century BC. They were discussed in depth by Julius Caesar in his account of his wars in Gaul. Some peoples in southern Britain were also called Belgae and had apparently moved from the continent. T. F. O'Rahilly believed that some had moved further west and he equated them with the Fir Bolg in Ireland. The Roman province of Gallia Belgica was named after the continental Belgae. The term continued to be used in the region until the present day and is reflected in the name of the modern country of Belgium.
The Menapii were a Belgic tribe dwelling near the North Sea, around present-day Cassel, during the Iron Age and the Roman period.
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.
The Bellovaci were a Belgic tribe dwelling in the modern Picardy region, near the present-day city of Beauvais, during the Iron Age and the Roman period. After they were defeated by Caesar in 57 BC, they gave lukewarm support to the Gallic revolt led by Vercingetorix in 52 BC. The Bellovaci nonetheless organized resistance against Rome in 51 BC.
The Morini were a Belgic coastal tribe dwelling in the modern Pas de Calais region, around present-day Boulogne-sur-Mer, during the Iron Age and the Roman period.
The Atuatuci were a Gallic-Germanic tribe, dwelling in the eastern part of modern-day Belgium during the Iron Age.
The Battle of the Axona was fought in 57 BC, between the Roman army of Gaius Julius Caesar and the Belgae. The Belgae, led by King Galba of the Suessiones, attacked, only to be repelled by Caesar. Fearing an ambush, the Romans delayed their pursuit. Caesar's Commentarii de Bello Gallico describes this battle at 2.7 - 2.11.
In the course of his Gallic Wars, Julius Caesar invaded Britain twice: in 55 and 54 BC. On the first occasion Caesar took with him only two legions, and achieved little beyond a landing on the coast of Kent. The second invasion consisted of 800 ships, five legions and 2,000 cavalry. The force was so imposing that the Britons did not dare contest Caesar's landing, waiting instead until he began to move inland. Caesar eventually penetrated into Middlesex and crossed the Thames, forcing the British warlord Cassivellaunus to surrender as a tributary to Rome and setting up Mandubracius of the Trinovantes as client king.
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.
The Viromanduī or Veromanduī were a Belgic tribe dwelling in the modern Vermandois region (Picardy) during the Iron Age and Roman periods. During the Gallic Wars, they belonged to the Belgic coalition of 57 BC against Caesar.
The Ambiani were a Belgic coastal tribe dwelling in the modern Picardy region during the Iron Age and Roman periods.
Ambiorix's revolt was an episode during the Gallic Wars between 54 and 53 BC in which the Eburones tribe, under its leader, Ambiorix, rebelled against the Roman Republic.
The Battle of Lutetia was a battle on the plain of Grenelle in what is now Paris between Roman forces under Titus Labienus and an anti-Roman Gallic coalition in 52 BC during the Gallic Wars. It was a Roman victory.
The Germani cisrhenani, or "Left bank Germani", were a group of Germanic peoples who lived west of the Lower Rhine at the time of the Gallic Wars in the mid-1st century BC.
This page is based on this Wikipedia article Text is available under the CC BY-SA 4.0 license; additional terms may apply. Images, videos and audio are available under their respective licenses.
Roman Republic 
