After a day Caesar reached Vellaunodunum, one of the walled towns of the Senones. The legions began to besiege the place and on the third day the inhabitants surrendered, promising to hand over their weapons, 600 hostages and - most important of all for the army's immediate needs - pack animals. Moving on the Romans came swiftly to Cenabum, the place where the rebellion had begun with the massacre of the Roman merchants. Caesar reached it in only two days, surprising the townsfolk who had not yet finished their preparations to resist a siege. It was late when the legions arrived, so the proconsul decided to postpone his assault until the following morning. Yet he also ordered two legions to stand to arms during the night, in case the townsfolk chose to flee across to the far bank of the Loire. The guess proved correct, and at about midnight the Roman scouts reported that crowds of people were heading from the town for the bridge over the river. There was no significant resistance when he sent his two legions into the town, while congestion at the bridge prevented many of the people from escaping captivity. Caesar ordered the town to be sacked and then burned down, and presumably had most of the prisoners sold as slaves. Then he crossed the Loire and advanced against the Bituriges. The Romans had regained the initiative, forcing Vercingetorix to respond to their actions and not vice versa. The latter had already abandoned his attack on the Boii and hurried back to protect the Bituriges. The Gaulish army arrived just as the Romans were accepting the surrender of the town of Noviodunum, and prompted the townsfolk to renew the fight, chasing out the centurions and small groups of soldiers who had entered their walls. A cavalry combat took place in the fields outside the town, and the Romans eventually won this when Caesar threw in his band of 400 Germans. This minor success, as well as the fact that the Romans were close outside their walls and the bulk of the Gaulish army still some way away, prompted the people of Noviodunum to change their minds for a second time, and they surrendered again, handing over the men responsible for breaking the truce. Caesar resumed his advance, heading for Avaricum (modern Bourges), one of the most important and certainly the best defended town of the Bituriges. Having regained the initiative, it was vital to keep it and give the enemy no chance to recover."
From the beginning Vercingetorix was sceptical about his ability to defeat the legions in battle, and the speed with which the Romans had taken three towns had only confirmed his respect for their fighting power and siegecraft. Instead he planned to shadow the enemy, ambushing small detachments but not risking a massed encounter. He wanted to deprive the Romans of supplies, and to do this he told his followers that they must be utterly ruthless: `... private possessions must be disregarded, villages and houses put to the torch in all areas as far afield as the enemy foragers were likely to range from their main route of march'." Even entire towns that could not be protected from the enemy were to be destroyed, to prevent the legions from capturing the food stores within them. The Bituriges set fire to twenty of the main settlements in response to this order. Vercingetorix argued that terrible though this was, the alternative was death for the warriors and enslavement for their families. His strategy was considerably more sophisticated than that employed by Caesar's earlier opponents, and Vercingetorix must clearly have possessed considerable charisma and force of personality to persuade his followers of the necessity of such uncompromising measures. It was remarkable just how much the tribes were willing to sacrifice, but unsurprising that they occasionally balked at the prospect. After pleas from all the leaders of the Bituriges, Avaricum itself was not destroyed. Vercingetorix grudgingly made an exception of the town, although he lacked their conviction that its natural and man-made defences rendered it impregnable.13
Avaricum was certainly a more daunting prospect than the towns taken so easily in the past weeks. Surrounded by river or marshes on most sides there was only one practical route for an assault, and it was next to impossible to create a solid blockade. Caesar's army camped at the foot of this slope and began to build a ramp that would allow them to reach the wall. The legionaries also made mantlets and sheds to shelter the workers as they got nearer to the enemy, and two siege towers to climb the ramp when it was finished. Caesar's eight legions were most likely under strength, so that he had perhaps 25,000-30,000 men, along with a few thousand auxiliaries and many more slaves and camp followers. It was very difficult to feed such a force while it was moving. When it settled down to besiege Avaricum the task became almost impossible. Foraging was unproductive and dangerous, since Vercingetorix was camped no more than 16 miles away and shadowed every detachment the Romans sent out, cutting up any group that became exposed. The proconsul sent repeated messages to the Aedui and Boii asking them to send him convoys of provisions, but very little arrived. The Aedui showed no enthusiasm for this task, although - perhaps in part because - they had been one of his main sources of supply since 58 Bc. The Boii were still grateful for his support, but were too small a people to have much of a grain surplus available. The scorched earth tactics of Vercingetorix were beginning to bite. At one point the Romans completely exhausted their stocks of grain, but fortunately the foragers had brought in enough cattle for these to be slaughtered and a meat ration supplied. Caesar praised his men for their fortitude in keeping on working while receiving only a meagre and monotonous issue of food. (The persistent myth that Roman legionaries were vegetarian is based on a misunderstanding of this and a couple of other passages. Normally they ate a balanced diet of meat, grain and vegetables. What was exceptional in this case was that they were receiving only meat, not that they were eating it at all.) 14
In spite of the shortages, and the watching menace of the main Gaulish army - for Vercingetorix kept in close communication with the defenders of the town - the legionaries kept toiling at the siege works. Caesar toured the lines as they laboured, inspecting the work and encouraging the men. On several occasions he offered to abandon the siege and withdraw if they felt that the task was beyond them. It was a clever way of exploiting the legionaries' pride in themselves and their units, as no one wanted to be seen as the first to quit. The men implored him to let them finish the job, rather than suffering the shame of giving up. The memory of the massacre of the Romans at Cenabum was still strong and provoked widespread anger. Caesar tells us that the soldiers requested their officers to emphasise to him their determination to continue and their absolute faith in their ultimate victory. By this time the ramp was getting bigger, so that the siege towers could move close to the walls, though not yet close enough for the rams mounted in them to begin creating a breach.
It was not only the Romans who were facing supply problems, and there were serious shortages in the Gaulish camp. In part this was simply because of the season and the need to remain in one place, but it also highlights the lack of logistic organisation in tribal armies. Vercingetorix was a better commander than most Gaulish leaders, and his army more flexible and better prepared than the average tribal force, but it still lagged a long way behind the Roman army in these respects. The progress of the siege may also have made him feel that he needed a fresh victory to encourage his men. The Gaulish army moved a little closer to the town. He then led out his cavalry and light infantry in person, hoping to mount an ambush on the Roman foragers. Caesar found out about this, either from his patrols, from prisoners or from deserters, and took the bulk of his army out to threaten the Gaulish camp. The enemy formed up to meet him, but were in too strong a position for him to attack without suffering heavy losses. The legionaries were keen for battle - encouraged by their own record of success and brimming over with the frustration caused by hard work and short rations. Caesar told them that he would not suffer casualties needlessly, for `their lives were more important than his own needs'. The Romans watched the enemy for a while and then marched back to camp. The threat had been enough to cause Vercingetorix to change his plans and return to his main force. Caesar had made it clear that he could not press too closely if he was unwilling to fight. For a while there was dissension in the Gaulish army, some eve
n claiming that Vercingetorix was in league with the Romans and wished to be made king of all Gaul with Caesar's aid. It is more than likely that the two men had met, and fairly probable that Vercingetorix had even received some favours from Caesar during his cultivation of the Arvernian aristocracy. Eventually he calmed them, bringing out captive Roman slaves and claiming that they were legionaries. The men had been coached to tell a plaintive story of the hardships and shortages in the Roman camp. Having convinced the men of the wisdom of his plan, he and the other chieftains selected 10,000 warriors and sent them to reinforce Avaricum.is
Sieges were tests of ingenuity as much as sheer determination. Some of Avaricum's importance came from the iron mines in the area and as a result skilled miners were available to try to undermine the Roman ramp. Other men worked to run up wooden towers strengthening the wall, and kept adding to these as the Romans increased the height of their own works. As the defender or attacker gained an advantage, so the other tried to devise a countermeasure to rob them of it. Yet in the end the Romans had greater engineering skill and, in spite of frequent sallies aimed at setting light to it, after twenty-five days the ramp was virtually complete. All in all it measured 330 feet wide and 80 feet high and had almost reached the town wall, so that soon the battering rams in the towers would be in range. That night the defenders set light to the timber supports in their mine, hoping either to collapse the whole ramp or to set fire to it. In the small hours Roman sentries spotted smoke coming from the wooden ramp. Almost immediately a shout went up from the wall and two groups of defenders charged out of separate gates carrying torches and incendiary material as well as weapons. According to Caesar's standing orders, two legions were on piquet duty throughout the hours of darkness. More Roman troops were sent in to support them as the furious combat swayed back and forth. Some of the legionaries fought off the enemy, while others dragged the siege towers back to safety, although they were not able to save some of the mantlets and shelters further up the ramp. It was a desperate struggle, and in the Commentaries Caesar makes one of those rare mentions of a minor incident that he witnessed. A Gaulish warrior stood near one of the town gates and kept hurling lumps of pitch and tallow at the Roman works. He was killed by the bolt from a scorpion - one of the Romans' light artillery pieces that shot its projectile with great accuracy and appalling force. As soon as he fell, another took his place, then another and another, as each was struck down by a bolt from the same ballista. Caesar was clearly impressed by their courage, something that the Commentaries never tried to deny the Gauls, even if Caesar tended to depict it as somehow not quite as good as the disciplined bravery of the legions.16
After bitter fighting the defenders were driven back inside their walls, having failed to inflict enough damage to seriously impede the Romans. A day later they willingly obeyed Vercingetorix when he urged them to escape from the town. Under cover of darkness the warriors tried to sneak out of the town and make their way through the marshes to the main army. The attempt failed when their abandoned families realised what was happening and raised such loud cries that it was feared the Romans would discover their purpose. On the following day - the twenty-seventh of the siege - the legionaries completed the ramp. It was raining heavily and Caesar decided on an immediate assault, judging that the defenders were likely to be off their guard. Orders for the storming were issued, and the necessary preparations made, the attacking troops forming up under cover of the sheds and shelters of the siege works to conceal the Roman purpose. Roman generals were always keen to encourage individual boldness, and the proconsul promised great prizes to the first men over the wall. At a signal the men suddenly erupted from cover and charged forwards, overcoming the surprised defenders and quickly seizing the rampart. A few parties of Gauls formed up in such open spaces as the market place, but their nerve cracked when they saw the Romans swarming around the walls. Throughout history troops who have stormed a fortified position have often been inclined to run amok once inside. Sieges have always been difficult and dangerous operations, the actual assault even more hazardous, and it was often hard for men who had endured both to switch off once they were inside, especially since in the narrow streets they were no longer under the close gaze of their officers. When a town was stormed it was normal for anyone who showed even the slightest resistance to be killed, while women were raped. This time the mood of the soldiers was more ferocious even than was usual on such occasions. Caesar says that the legionaries: `Remembering the massacre at Cenabum and the labours of the siege, did not spare the elderly, the women and the infants. In the end from the whole number, about 40,000 people, little more than 800 who had fled the town at the first shout escaped to join Vercingetorix."'
About a century earlier Polybius had described how the Romans sometimes deliberately massacred the inhabitants of a captured town, killing even the animals they found there, so that this would inspire terror and persuade future enemies to surrender and render an assault unnecessary. There is no reason why Caesar should not have told us if he had ordered the slaughter of Avaricum's population as a warning to others. He was candid about other massacres or mass executions, and no Roman reader was likely to be too upset about the fate of foreign enemies. It does seem that it was sheer rage on the part of the legionaries, frustrated and weary after a difficult siege in cold weather and with very poor provisions, that led to the slaughter. Killing the inhabitants - and even if it was perhaps not quite as total as Caesar implies, the death toll must have been substantial - was not really in their interest on a pragmatic basis, since every defender killed was one fewer to be sold as a slave for the profit of all. Having said that, Caesar does not seem to have made any effort to restrain his men, although it is highly questionable whether he would have been able to do so even if he had tried. 18
SETBACK AT GERGOVIA
Caesar rested his army for several days after the sack of Avaricum. Large stores of grain and other provisions were discovered inside the town, greatly easing the supply situation. Spring was also beginning, making foraging more practical. The two legions left to guard the baggage train were brought up to join the main force. Caesar was eager to resume the offensive to make it harder for Vercingetorix to wrest back the initiative, but he now received an appeal from the Aedui that he could not afford to ignore. Two men were both claiming to have been elected to the tribe's supreme magistracy, the post of Vergobret. Dissension amongst the chieftains of his largest and most important ally was obviously dangerous at a time of rebellion, for it would be all too likely that one side or the other would seek support from Vercingetorix. Therefore Caesar hastened south to meet with the rivals - the Vergobret was forbidden to leave tribal territory in his year of office, so this restriction, as well as the reluctance to offend an ally at this time, meant that he could not make them come to him. The proconsul decided which man was the rightful magistrate, having discovered that tribal law effectively barred his opponent. He then asked that the tribe supply him with as many cavalry as they could as well as 10,000 infantry to be used to defend his supply lines. Hurrying back to the army, Caesar decided to divide into two columns. Labienus was to take four legions and move north against the Senones and Parisii, while he took the remaining six southwards and attacked the Arverni. It was clearly dangerous to divide his resources in this way, but given the reluctance of the rebels to risk a pitched battle, he must have judged that the risk was acceptable. The rebels had no single capital or even a united army, the defeat of which would convince them to surrender. For all the charisma of Vercingetorix, he still led many fiercely independent tribes and each of these would need to be suppressed. If an area in rebellion was left unmolested, then this would only cause the rebels to grow in confidence and in numbers, and make it likely that more neighbouring peoples would be encouraged or coerced into joining.19
The short lull had given Vercingetorix time to recover from the loss of Avaricum. In some ways the defeat strengthened his own prestige, since he had spoken against defendi
ng the town from the beginning and had only reluctantly been persuaded to relent. His plan remained much the same, to harass rather than confront Caesar and his army, and to try to win over more chieftains and tribes to his cause. As the Romans marched along the line of the River Allier, Vercingetorix kept pace with them on the opposite bank, sending men out to break down all the bridges and to guard all the spots where a new one might be built. Caesar needed to cross if he was to threaten Gergovia, the town where Vercingetorix had first declared himself as the leader of the Arverni, but at this time of the year the river could not be forded by an army. That day the Roman column camped in wooded country close to one of the destroyed bridges. When the army marched out the next day, Caesar and two legions stayed behind under cover of the trees. The other four legions `opened out some of their cohorts, so that the number of units looked the same'. The Gauls suspected nothing as the Roman column marched on and eventually built its camp in the same way that it had done on all the other days. They in turn moved on, ready to deny all the crossing places further down to the enemy. However, late in the day, by the time he thought that the main force would have halted, Caesar brought out his two legions and set them to constructing a bridge. Once that was complete they went across and began work on the ditch and wall of a camp. Messengers went to the main force recalling them. By the time that Vercingetorix discovered what had happened, it was too late to do anything about it. He headed away from the river, eager to put more distance between himself and Caesar since he had no wish to stay too close. His plan was still to avoid battle. Caesar followed him and in five days reached Gergovia.20
The proconsul rode forward to inspect the enemy position and soon realised that it was a strong one. The town itself stood on a hill, and on the rolling high ground around it Vercingetorix had camped his army, each tribal contingent having been allocated a position to hold. Direct assault looked impractical and would certainly be costly. The enemy might be starved into submission, but the Romans could not hope to mount an effective blockade until they had secured their own stocks of food. A convoy from the Aedui was on its way but had yet to reach the army. As Caesar waited he mounted a night attack to capture one of the Gaulish outposts, giving him a position from which to threaten the enemy's water supply and access to forage. A smaller camp occupied by two legions was built on this spot and connected to the main camp by a route enclosed by a deep ditch on either side. Both sides settled down to watch their opponents warily, sending out their cavalry and light infantry to skirmish, but neither willing to risk a full-scale battle. Vercingetorix held daily meetings for his chieftains and for the moment continued to impose an unusually high standard of discipline for a tribal army.2'
Caesar: Life of a Colossus Page 44