Although the hindrance to the grain supply had been removed, it was not an instant solution to his problems, and it would still take time for the Aedui to bring the grain to his army. Caesar needed to force a quick outcome to the campaign, and on the same day as he had held these meetings he believed that he had spotted the opportunity. His scouting patrols came back to report that the Helvetii had camped some 8 Roman miles away, next to some high ground. Caesar sent out another patrol to carry out a detailed reconnaissance of the position, looking in particular at how readily the slopes of the hill might be climbed from each side, especially that furthest from the enemy. This party returned to report that the ascent was straightforward. Caesar decided to launch a full-scale attack on the enemy camp, hoping to achieve the same sort of surprise he had gained against the Tigurini. Labienus was given command of two legions - persumably two of the experienced ones - and would march out in the small hours of the morning to seize the hill. Two hours later Caesar would lead out the rest of the army and march the 8 miles to the enemy camp. When Labienus saw him beginning his assault, he was to attack with his legion from the high ground. Both forces were to follow the same route for most of the way, being guided by men who had taken part in the previous day's patrol and seen the ground in daylight.
It was a bold plan, but a perfectly feasible one, using a method of preparation that in its essence would not be unfamiliar to a modern army. Caesar had plenty of experience of raids and surprise attacks, rather more than he had of pitched battles, for warfare in the Spanish Peninsula tended to be of this type. Marius had similarly managed to secrete a strong detachment of men in dead ground behind the Teutones at Aquae Sextiae in 102 BC. Operations at night have always been risky, for the potential for confusion and units getting lost is always there. In this case things began very smoothly. Labienus moved out and disappeared into the darkness. After the appointed interval Caesar followed with the main force. The cavalry led the column, and sent out patrols to screen the advance. These scouts were placed under the command of one Publius Considius, an experienced officer with a fine military reputation. He had served under Sulla and Crassus and was therefore probably at least in his forties. Caesar does not give his rank but he was probably a tribune or prefect, although it has sometimes been suggested that he was a centurion. It is possible that he was a relation of the senator Considius, who the year before had declared that, unlike many others, he was too old to worry about danger (see p.177).19
By dawn the main force was only a mile and a half from the enemy camp, and Labienus was waiting in position, but was out of contact with Caesar. The Helvetii, like many tribal armies somewhat careless in scouting, were completely oblivious to the presence of either force. At this point Considius galloped in to report that the hill was not in fact held by the Romans, but by the Gauls. He was absolutely positive about this, saying that he had clearly seen their weaponry, crests and insignia. The news meant that Labienus had either got lost and never reached his destination or that he had been defeated. In either case the Helvetii were obviously well prepared and waiting for them. Caesar immediately halted the column. He had four legions, two of which were most likely the raw Eleventh and Twelfth. His men were also tired after the night march, still doubtless fresh enough to attack surprised and scattered opponents encumbered by baggage and families, but not necessarily up to a long drawn-out pitched battle. To attack under these circumstances would have meant fighting at a serious numerical disadvantage on ground chosen by the enemy. He ordered the column to withdraw to a nearby ridge and there formed them into a battle line to await any attack. Time passed. The Helvetii roused themselves and set off to continue their journey, still completely unaware that the shadowing Roman army had now come so close and had divided. Labienus followed his orders to the letter, not engaging until he saw Caesar's men beginning their attack. In any case, there was little that he could have done with just two legions at his disposal. It was only late in the day that scouts from the main force established contact with Labienus' detachment and confirmed that they, and not the enemy, held the key position. In what was left of the day Caesar took the army after the Helvetii, setting camp that night 3 miles away from them.20
It had been an embarrassing failure, but could so easily have proved disastrous if the Helvetii had fully appreciated the situation and turned on either section of the Roman army. Labienus' men had been especially vulnerable on the hill. Caesar had learned that he could trust the judgement and sense of his senior legate, but not that of other officers, however great their reputation. It was a lesson in the risks inherent in complex operations and the role in warfare played by chance. Caesar makes no mention of whether or not he punished Considius for losing his head, but the publication of the Commentaries ensured that his shame was widely known. In his account Caesar passed the blame for the failure onto his subordinate. This was not entirely unreasonable, but his soldiers may not have seen it that way at the time. Caesar had given the orders, and it was he who had halted the main force on a false report and taken a very long time before checking its accuracy. During this period their comrades in the two legions with Labienus had been left very much out on a limb. The pursuit of the Helvetii continued, but the situation was not good. The wheat ration was due for issue in two days, but there were no supplies for this. On the following morning Caesar decided that things could not continue as they were and gave orders to abandon their cautious chase of the Helvetii for the moment. The army turned away and marched to Bibracte, some 18 miles away. He planned to replenish his supplies there and then move against the Helvetii once more. Given the latter's plodding progress, it should not prove too difficult to catch up with them again."
With hindsight this proved the turning point in the campaign. Some warriors serving amongst Caesar's Gaulish allies quickly deserted and rode over to the enemy, reporting the Roman withdrawal. The Helvetii decided to pursue, presumably interpreting the move as a sign of weakness. Caesar also wondered if they hoped to cut him off from Bibracte and his supplies. The Roman rearguard was soon under attack. Caesar reinforced it with all of his cavalry and used them to cover the deployment of his army. Occupying a nearby hill, he placed the experienced Seventh, Eighth, Ninth and Tenth legions in the main line. If he followed his later practice, then the Tenth was probably in the place of honour on the right of the line. Each legion was deployed in the normal formation, the triple line (triplex acies) with four cohorts in the front line, and three each in the second and third. The legionaries laid down their packs - normally carried suspended from a staff that was then rested on the shoulder - so that they could fight unencumbered. Shields were removed from their protective leather covers to expose the insignia of each unit, and crests fixed to helmets. Behind them, further up the slope, he stationed the inexperienced Eleventh and Twelfth legions along with his auxiliary infantry. They were to guard the packs and the baggage train, and began to dig out a small trench and rampart to surround them, but it is very unlikely that there was time to construct a fully fledged marching camp of the type normally built by any Roman army at the end of a day's march. It was important for the soldiers in the battle line to know that their possessions were safe, and clearly Caesar was still reluctant to trust these inexperienced soldiers. Probably the four experienced legions formed a line covering most of the slope, but as with most of Caesar's battles it has proved impossible to locate the site of this encounter, so that we cannot talk about the topography with any certainty. Caesar does tell us that the slope ensured that the two legions and the auxiliaries were clearly visible to the enemy, covering the hillside in men and creating a strong impression of the Romans' numerical strength.
The deployment of the army took time - probably several hours - and was covered by the cavalry, but the Helvetii also needed a good deal of time to advance and prepare themselves for battle. They had been travelling for some weeks now, and had through necessity developed a degree of coordination, but even so it was a major task concentrating enough o
f their warriors in one place to overcome the Romans. With the fighting men came their families and dependants, along with the baggage, and the Helvetii formed the wagons into a rough laager behind their line. Gradually their army began to form up, but the fighting would begin before some contingents had arrived. Caesar does not supply any figure for the number of warriors he faced at the start of the battle, but the willingness of the Helvetii to attack would suggest that the two sides had at the very least a rough parity of numbers - that is unless the tribesmen were utterly disdainful of the Romans' fighting prowess. Long delays before a battle were common in this period, which inevitably must have been a nervous time as men had little to do save wait. Caesar decided that a grand gesture was called for and very openly dismounted and sent his own horse to the rear, along with those of all his senior officers, in order to `make the danger equal for all, and remove the temptation of flight'. Catiline had done the same thing in 62 i;c: before the battle when his outnumbered followers had been cornered by an army loyal to the Senate. The gladiator Spartacus had gone a step further in his last battle, slitting the throat of the expensive horse he had captured from a Roman general in an earlier encounter. A general on foot was a lot less mobile and therefore could see less of the battle as it developed, so Caesar had sacrificed a number of practical advantages to encourage the men in this way. He would never again do this in any of his later battles, and it does suggest that he was aware that his legionaries did not yet know him that well, and that the campaign had not been going especially well in the last few days. Perhaps it was also an indication that he was not yet entirely sure of himself as a commander. For further encouragement he addressed the men, probably walking along and talking to each cohort in turn since it is unlikely that all four legions could have heard him at the same time."
Battle of Bibracte
The battle began in the middle of the afternoon, when the Helvetii advanced up the slope against the Roman line. They came on in good order, keeping a close formation. Armies tried to intimidate their opponents before they reached them, frightening them with their battle cries, the noise of their trumpets and their ferocious appearance. It was not uncommon for one side to be so overawed that they would break and flee before ever a blow had been struck. This was one of the main reasons why it would have been risky to expose the recently raised legions to the pressure of battle. In this case, the experienced legionaries waited, their normal tactic in this period was to keep silent, intimidating the enemy by their apparent calmness. When the Helvetii came close - probably within 10-15 yards - the legions threw their pila, the heavy javelins punching through shields and in some cases even pinning two overlapping shields together. Some warriors were killed or wounded, others forced to drop their encumbered shields. The momentum had gone from the attack and the Romans followed up their advantage by cheering, drawing their swords and then charging into contact. They had the advantage of ground and the enthusiasm and impetus of the charge, but even so the Helvetii fought on for some time before they began to give way and retreated down into the plain. The Romans followed, but seem to have done so in an orderly manner and soon lost contact with the fugitives, who ran back to the high ground on the other side of the valley, about a mile away. However, at this point the Romans faced a new threat, as a fresh contingent of 15,000 warriors arrived on their open right flank. These were the Boii and the Tulingi, two allied peoples who had been further back in the Helvetian column. It is unlikely that this was a planned manoeuvre and that the first attack had been no more than a feint to draw the Romans down onto the level ground - it was probably just a happy coincidence for the Helvetii. A tribal army - even a Hellenistic army where the doctrine was to mass the infantry in a single dense line without significant reserves - would have been in serious trouble in this situation, in danger of its whole line being rolled up by the fresh enemy. In contrast the Roman military system emphasised the importance of a reserve, normally keeping at least twothirds of their force back from the fighting line at the start of a battle. The third line of cohorts was peeled away and formed into a new line to face the Boii and Tulingi. The first and second lines dealt with the Helvetii, who had rallied at the appearance of their allies and returned to the fray. The Eleventh and Twelfth do not seem to have been brought up from the extra reserve Caesar had in this battle and appear to have remained mere observers of the action .21
The battle was hard-fought and continued until well after nightfall, but after the initial shock of the arrival of these new forces, the Romans made steady headway. The struggle for the wagon laager was especially bitter, as the warriors fought to defend their possessions and families. Caesar makes no mention in his account of what he did during the battle, it is simply `the Romans' who wheeled and formed fighting lines facing in two directions. Presumably he was doing what every Roman commander should do, staying close behind the fighting line, encouraging the men and committing reserve troops as necessary. In the end the victory was complete, but the Roman losses were comparatively heavy and the army was to remain where it was for three days to look after the wounded and bury the dead. Numbers of prisoners had been taken, including both a son and daughter of Orgetorix, but Caesar says that 130,000 people escaped from the battle and fled north east towards the territory of the Lingones. In the circumstances it must have been hard for him to make an accurate count, but clearly sizeable numbers of the migrants survived the battle. Many may not have reached it at all, but those who had been involved had lost most of the baggage. Caesar did not pursue immediately. He had still not sorted out his supply situation, and the care he showed for his casualties was important in adding to the growing trust between army and commander. Instead he sent messages to the chieftains of the Lingones, ordering them not to aid the Helvetii, unless they wanted to be treated as enemies.
After three days he set out after the enemy, but was soon met by a delegation offering to surrender. Caesar instructed them to tell the tribesmen to halt and wait for him to reach them and give a decision. That they did so was an indication that they were not simply playing for time. When Caesar arrived he demanded and received hostages, as well as getting the Helvetii to return the slaves who had fled to or been taken by them during their migration. The warriors were also disarmed. On the first night some 6,000 men from one clan broke away from the camp, heading eastwards towards the Rhine. Caesar sent messengers to the communities in their path with the same stark warning as he had given to the Lingones. The fugitives were brought back and sold into slavery, being denied the terms that he extended to everyone else. The Helvetii and most of their allies were then ordered to return to their homelands and settle there once more. Instructions were sent to the Allobroges in his province to supply the returning tribes with grain until they had re-established themselves once more, rebuilding their burnt settlements and cultivating their farms again. After an appeal from the Aedui, Caesar allowed them to settle the Boii on lands within their tribal territory. Stability was restored to the lands surrounding Transalpine Gaul, but the cost in human lives had been very high. In conclusion, Caesar states that of the 368,000 people listed in the records captured from the Helvetii, only some 110,000 returned home; the 32,000 Boii - minus their casualties from the battle - settled in Gaul, while 6,000 fugitives were sold into slavery, leaving a massive deficit of 220,000. As always we cannot know how accurate these figures were, and presumably very large numbers of people had simply dispersed in the face of Roman attacks, just as the Tigurini had done at the Saone. Nevertheless, many - perhaps tens of thousands - must have been killed, but we should not let the modern horror at such huge loss of life blind us to the response of Caesar's Roman audience to such statistics. For them, a dangerous movement of hostile peoples had been stopped and their province, which was not far from Italy itself, secured for the future. In the Commentaries Caesar often makes use of the verb parcere which meant `to pacify' and was used for the defeat of any people, anywhere, who had refused when challenged to submit to Roman authority
. Pax or `peace' was the outcome of a Roman victory. From the Roman perspective, peace had returned to the northern frontier.24
THE FRIEND OF THE ROMAN PEOPLE
By this time it was summer. Several months of the campaigning season remained, but there would not have been enough time to shift the forces back to the Balkan frontier and begin operations there. Caesar had already won a great victory, but was hungry for more and reluctant to stand idle even for a short time. He was soon presented with an opportunity for a further military adventure. Delegations had come in from most of the Gallic/Celtic tribes of central Gaul congratulating him on his defeat of the Helvetii. The praise may in part have been genuine, but it was obviously wise to establish good relations with any new power that had moved into the region. These envoys requested permission to summon a meeting of all the tribes at which they could meet him and present petitions. In another tearful scene, chieftains threw themselves at the proconsul's feet and, with the druid Diviciacus as their spokesman, begged Caesar to protect them from the German King Ariovistus. They claimed that the man who had been invited in to aid the Sequani had since then brought in and settled 120,000 of his people on their lands and taken hostages from all the tribes. They complained of his tyranny, calling him a `wild, uncontrolled barbarian'. More Germans were said to be coming to join their war-leader and Caesar was asked `to defend the whole of Gaul from the onslaught of Ariovistus'. Representatives from the Sequani silently supported the plea, Diviciacus answering Caesar's enquiry by saying that they were too afraid to speak lest word be carried to the Germans. Caesar then assured the gathered chieftains that he would take care of the matter and use his auctoritas to persuade Ariovistus to moderate his behaviour. Privately he took the matter very seriously, feeling that he must support the Aedui because of their long and loyal alliance with Rome. Apart from that, he also claims that he was concerned about the Germans getting into the habit of migrating across the Rhine, lest this happen too frequently and cause folk movements on the scale of the migrations of the Cimbri and Teutones.25
Caesar: Life of a Colossus Page 30