Battle of the Allia
|Battle of the Allia|
|Part of Roman-Gallic Wars|
Paul Jamin, Brennus and His Share of the Spoils, 1893
|Roman Republic||Senone Gauls|
|Commanders and leaders|
|The military tribunes with consular powers. There were 6 such tribunes. The sources do not say how many fought in the battle.||Brennus|
|The estimates are: 15,000, 24,000, 35.000, and 40,000||The estimates are: 12,000, more than 40,000. and 30-70,000|
|Casualties and losses|
The Battle of the Allia was fought between the Senones (one of the Gallic tribes which had invaded northern Italy) and the Romans. It was fought at the confluence of the rivers Tiber and Allia, eleven Roman miles (16 km) north of Rome. The Romans were routed and subsequently the Senones sacked Rome. The common date given for the battle is 390 BC. This is based on the account of the battle by the Roman historian Livy and the Varronian Chronology, a Roman dating system. The ancient Greek historian Polybius, who used a Greek dating system, derived the date 387/6 BC. Plutarch wrote that the battle took place just after the summer solstice when the moon was near the full, a little more than three hundred and sixty years from the foundation of Rome. That would be shortly after 393 BC.  Tacitus said that the battle took place the 15 before the Kalends of August, which is 18 July. 
- 1 Background
- 2 Size of the belligerent forces
- 3 Battle
- 4 Aftermath, the sack of Rome
- 5 Roman Recovery
- 5.1 Rome under attack
- 5.2 Modern evaluations of these conflicts
- 5.3 Rome rebuilds her city walls
- 5.4 Fear of the Gauls
- 6 Legend about Brennus
- 7 See also
- 8 Notes
- 9 References
- 10 External links
The Senones were one of the various Gallic tribes which had recently invaded northern Italy. They settled on the Adriatic coast around where modern Rimini is. According to Livy, they were called to the Etruscan town of Clusium (modern Chiusi in Tuscany) by Aruns, an influential young man of the city who wanted to take revenge against Lucumo, who had "debauched his wife."  When the Senones appeared, the Clusians felt threatened and asked Rome for help. The Romans sent the three sons of Marcus Fabius Ambustus, one of Rome’s most powerful aristocrats, as ambassadors. They told the Gauls not to attack Clusium and that if they did, the Romans would fight to defend the town. They then asked to negotiate a peace. The Senones accepted a peace on condition that the Clusians would give them some land. There was a quarrel and a battle broke out. The Roman ambassadors joined in. One of them killed a Senone chieftain. This was a violation of the rule that ambassadors have to be neutral. The brothers had taken sides and moreover, one of them had killed a Senone. The Gauls withdrew to discuss what action to take. 
According to Dionysius of Halicarnassus, Lucumo was the king of the city. He assigned the guardianship of his son to Aruns before he died. When the son became a young man, he fell in love with the wife of Aruns and seduced her. The grieving Aruns went to Gaul to sell wine, olives and figs. The Gauls had never seen these products and asked Aruns where they were produced. He replied that they came from a large and fertile land inhabited by only a few people who were not good fighters. He advised them to drive these people out of their land and enjoy the fruit as their own. He persuaded them to come to Italy, go to Clusium and make war. In Dionysius' account it is presumed that these Gauls had not invaded Italy and were in Gaul. When Quintus Fabius, one of the Roman ambassadors, killed a Gallic leader they wanted the brothers to be handed over to them to pay the penalty for the men they had killed. 
When the ambassadors of the Senones arrived in Rome demanding that the three Fabii brothers be handed over to them, the Senate was pressured by favouritism not to express opinions against the powerful Fabia family. To avoid being blamed for a possible defeat if the Gauls attacked, they referred the matter to the people. Livy wrote that "those whose punishment they were asked to decide were elected military tribunes with consular powers [heads of state] for the coming year."  The Gauls were enraged that those who had violated the law of nations had been honoured and marched on Rome, which was 130 kilometres (81 mi) from Clusium. Livy wrote that "in response to the tumult caused by their swift advance, terrified cities rushed to arms and the country folk fled, but the Gauls signified by their shouts wherever they went that their destination was Rome." 
Size of the belligerent forces
The number of fighters involved in the battle is not known for sure. Plutarch said that the Romans were not outnumbered and had 40,000 men, but most were untrained and unaccustomed to weapons. Dionysius of Halicarnassus said that the Romans had four well-trained legions and a levy of untrained citizens which was larger in number. This would give a rough figure of some 35,000. Diodorus Siculus said that the Romans had 24,000 men. Livy did not give any figures. Modern historians Cary and Scullard estimate that the Romans had 15,000 men and the Gauls 30-70,000. Berresford Ellis gives an estimate of a minimum of 24,000 based on the assumption that “the Romans had … four legions – for each consul had two legions under his command – and given that each legion had 6,000 men." He also thinks that there may have been a contingent of allied troops. He thinks that the “Senones’ tribal army could scarcely more than 12,000."
The figures given by ancient historians for the size of the Roman army engaged in the battle are unlikely, as they are notorious for exaggerating figures. Contrary to Berresford Ellis' assertion, at that time the Romans had two legions, not four. The number of legions was increased to four later in the century, during the Second Samnite War (326-304 BC), and the first record of four legions is for 311 BC. At that point the Romans also had additional military commanders: the praetor (who had been instituted in 366 BC) and the proconsul who was a consul who received an extension of his term of military command (this practice started in 327 BC). The first historical hints of the consuls leading more than one legion were for 299 BC (during a war with the Etruscans) and 297 BC, during the Third Samnite War (298-290 BC). The first explicit mention of a consul with two legions is for 296 BC. In 295 BC the Romans deployed six legions, four, led by the two consuls, fought a coalition of four peoples (the Samnites, Etruscans, Umbrians and Senone Gauls) in the huge Battle of Sentinum and two were led to another front by a praetor. The battle of the Allia took place in the early days of Rome, at a time when the Roman army was much smaller and its command structure was much simpler. The Roman army had only two legions and the two consuls were the sole military commanders; each headed one legion. In addition to this, the battle occurred during a period in the early history of the Roman Republic when the consulship alternated with years when Rome was headed by military tribunes with consular power (often referred to as consular tribunes) instead, and 390 BC was a year in which six consular tribunes were in charge. Therefore, Berresford Ellis’ assertion that the Romans at the battle of Allia had four legions, two for each of the two consuls, is doubly anachronistic. Moreover, the Roman legions had 6,000 men, only a few exceptional occasions. In the early days of the Republic, when the Battle of the Allia took place, it was 4,200; later, it was 5,200 when at full strength (the legions were often under-strength). Accordingly, the Roman force at the battle was likely to have been substantially smaller than estimated.
The size of the population of Rome at that time also need to be considered. In her early days Rome was still a city-state of only regional significance and whose territory did not stretch beyond 50 kilometres (30 mi) from the city. Cornell notes that the estimates of the population of Rome in the late 6th century BC based on the size of her territory range between 25,000 and 50,000 and thinks that the more likely figure is 25-40,000. The seminal work by Fraccaro gives a pool of military manpower of 9,000 men of military age  (aged between 17 and 47), which would require a minimum population of 30,000. Archaeological evidence shows that in the 5th century BC there was an economic downturn. This would have precluded considerable population growth. The territory of Rome had increased by 75% by the early 4th century, but the bulk of this increase was due to the recent conquest of the city of Veii and her territory, and its population did not have Roman citizenship, which was a prerequisite for serving in the Roman army. These considerations make it unlikely that the size of the population of Roman citizens would have been big enough to provide a military pool of 24,000 or more soldiers at the time of the Battle of the Allia.
In addition to the above, which gives further reasons to doubt the figures given about the size of the Roman forces at the Battle of the Allia, it has to be noted that the Romans did not have much time to prepare for the battle properly as, after their embassy was rebuffed by the Romans, the Gauls immediately marched on Rome, which was only a few days’ march away. The Roman army of that time was a part-time militia of peasant farmers which was levied for the military campaigning season and then returned to their farms. Not all men of military age were drafted every year. Some of the soldiers would have lived some distance from Rome and would have needed time to walk there (walking was the main means of travel for peasants).
The size of the Senone force should not be overestimated either. The estimate given by Cary and Scullard of 30-70,000 (see above) is highly unlikely. Berresford Ellis rightly points out that his figure of 12,000 would have been quite large for a single tribe.
There are only two ancient accounts which provide details of the battle. One is by Livy and the other is by Diodorus Siculus.
According to Livy, in Rome no special measures were taken and the levy “was not larger than had been usual in ordinary campaigns.” The Gauls marched on Rome so quickly that “Rome was thunderstruck by the swiftness at which they moved, which is shown both by the haste in mustering the army, as if it were meeting a spur-of-the moment emergency and the difficulty in getting any further than the eleventh milestone.” The Romans were greatly outnumbered. They did not set up camp or build a defensive rampart and they did not divine the gods as they were supposed to. They extended the wings in order not to be outflanked, but this made their line thin and weakened such that the centre could hardly be kept together. They placed the reserves on a hill on the right. Brennus, the Senone chieftain, suspected that this was a ruse and that the reservists would attack him from the rear while he was fighting the Roman army in the plain. He therefore attacked the hill.
The Romans panicked. The left wing threw their arms down and fled to the bank of the River Tiber. The Gauls killed the soldiers who were blocking each other’s path in the disorderly flight. Those who could not swim or were weak were weighed down by their armour and drowned. Still, the majority of these men reached Veii, an Etruscan city which had recently been conquered by Rome and which was near the other bank. They did not even send a messenger to warn Rome. The right wing, which was further from the river and closer to the hill, instead fled to Rome. The Gauls were surprised at how easy their victory had been.
The ancient Greek historian Diodorus Siculus said the Romans marched and crossed the River Tiber. He is the only ancient historian who placed the battle on the right bank of the river. They lined up their best troops, 24,000 men, in the plain and placed the weakest troops in the hill. The Celt also lined up and placed their best men on the hill and easily won the clash there. The bulk of the Roman soldiers in the plain fled to the river in a disorderly manner and impeded each other. The Celts killed the men in the rear. Some Romans tried to cross the river wearing their armour which, according to Diodorus, they prized more than their lives, but this weighed them down. Some drowned and some managed to reach the bank further downstream with great effort. As the Gauls kept killing the Romans, the soldiers then threw their arms away and swam across the river. The Gauls threw javelins at them. Most of the survivors fled to the city of Veii. Some returned to Rome and reported that the army had been destroyed.
Plutarch wrote that the Gauls encamped near the confluence of the Allia with the Tiber, some 18 kilometres (11 mi) from Rome. They attacked the Romans suddenly. There was a “disorderly and shameful battle.” The Roman left wing was pushed into the river and destroyed, while the right wing withdrew before the Gauls’ attack from the plain to the hills and most of them fled to Rome. The rest of the survivors escaped to Veii at night. "They thought that Rome was lost and all her people slain."
Aftermath, the sack of Rome
Account of Livy
Livy provides a detailed account of the sack of Rome. The Gauls were dumbfounded by their sudden and extraordinary victory and did not move from the place of the battle as if puzzled. They feared a surprise and despoiled the dead as was customary for them. When they did not see any hostile action, they set off and reached Rome before sunset. They saw that the city gates were open and that the walls were unmanned. This was another surprise. They decided to avoid a night battle in an unknown town and encamped between Rome and the River Anio. The inhabitants of Rome did not know that most of their soldiers had fled to Veii instead of Rome and thought that the only survivors were those who fled back to Rome and that they had only a tiny force. There was panic. Realising that they were defenceless, they decided to send the men of military age, the able-bodied senators and their families to the Capitoline Hill with weapons and provisions to defend the fortress. The Flamen of Quirinus and the Vestal Virgins, who were priests, were to take "the sacred things of the State" away and continue to perform their sacred cults. The situation was so dire that the elderly were left behind in the city and former consuls stayed with them to reconcile them with their fate. However, many of them followed their sons to the Capitoline. No one had the heart to stop them. Many people fled to the Janiculum Hill just outside the city and then dispersed to the countryside and other towns. The Flamen of Quirinus and the Vestal virgins could only take some of the sacred objects and decided to bury the rest under the chapel next to the Flamen's house. They set off to the Janiculum with what they could carry. Lucius Albinus, who was leaving the city on a wagon, saw them walking. He ordered his wife and children to get off and gave them and the sacred vessels of Rome a lift to Caere (an Etruscan city of the coast which was an ally of Rome). 
Those who had been officers of state decided to meet their fate wearing their ceremonial dresses and "the insignia of their former rank and honour and distinctions." They sat on their ivory chairs in front of their houses. The next day the Senones entered the city. They passed through the open Colline gate and went to the Roman Forum. They left a small body to guard there against any attack from the Capitoline and went through the streets for plunder. They did not meet anybody. People moved to other houses. The Gauls returned to the area of the Forum. Livy memorably described Gauls' encounter with the elderly patricians:
The houses of the plebeians were barricaded, the halls of the patricians stood open, but they felt greater hesitation about entering the open houses than those which were closed. They gazed with feelings of real veneration upon the men who were seated in the porticoes of their mansions, not only because of the superhuman magnificence of their apparel and their whole bearing and demeanour, but also because of the majestic expression of their countenances, wearing the very aspect of gods. So they stood, gazing at them as if they were statues, till, as it is asserted, one of the patricians, M. Papirius, roused the passion of a Gaul, who began to stroke his beard - which in those days was universally worn long - by smiting him on the head with his ivory staff. He was the first to be killed, the others were butchered in their chairs. After this slaughter of the magnates, no living being was thenceforth spared; the houses were rifled, and then set on fire. 
Despite the above statement, Livy wrote that these fires were not as widespread as one could expect in the first day of the capture of a city and speculated that the Gauls did not want to destroy the city and just wanted to intimidate the men on the Capitoline Hill into surrender to save their homes. Despite the anguish at hearing "the shouts of the enemy, the shrieks of the women and boys, the roar of the flames, and the crash of houses falling in," these men were resolved to continue to defend the hill. As this continued day after day, "they became as it were hardened to misery." After a few days, seeing that even though nothing survived "amidst the ashes and ruin" of the city there was no sign of surrender, the Senones attacked the Capitoline Hill at dawn. The defenders let the enemy climb up the steep hill and flung them down the slope. The Gauls stopped half way up the hill. The Romans charged and inflicted such high casualties that the enemy never tried to take the hill again. Instead, they prepared a siege. They divided their forces into two. One division besieged the hill and the other went foraging in the territories of the neighbouring cities because all the grain around Rome had been taken to Veii by the Roman soldiers who had fled there. Some Gauls arrived at Ardea, where Marcus Furius Camillus (a great Roman military commander who had seized Veii a few years earlier) had gone when he was exiled because of accusations of embezzlement. Camillus rallied to people of Ardea to fight. He marched at night and caught the camp of the Gauls by surprise, massacring the enemy in their sleep. Some Gallic fugitives got near Antium and were surrounded by its townsmen. 
Meanwhile, in Rome both sides were quiet. The Senones conducted the siege "with great slackness" and concentrated on preventing the Romans from slipping through their lines. The patrician clan of the Fabii held an annual sacrifice on the Quirinal Hill. Gaius Fabius Dorsuo came down the Capitoline carrying the sacred vessels, passed through the enemy pickets and went to the Quirinal. He duly performed the sacred rites and returned the Capitoline. Livy commented that "[e]ither the Gauls were stupefied at his extraordinary boldness, or else they were restrained by religious feelings, for as a nation they are by no means inattentive to the claims of religion." 
In the meantime, the survivors of the battle who had fled to Veii begun to regroup. Led by Quintus Caedicius, a centurion they chose as their leader, they routed a force of Etruscans who looted the territory of Veii and intended to attack this city. They made some prisoners lead them to another Etruscan force which was at the salt works. They inflicted even greater losses on this force. Caedicius’ forces grew. Some Romans who had fled the city went to Veii. Volunteers from Latium also joined them. Caedicius decided to summon Marius Furius Camillus to take the command. However, the approval of the senate was needed for this. They sent Cominius Pontius, a soldier, to Rome as a messenger. He went down the River Tiber on a cork float and reached Rome. He reached the Capitoline by scaling "a precipitous rock which, owing to its steepness, the enemy had left unguarded." The senate decreed that the popular assembly was to pass a law which annulled the banishment of Camillus and appointed him dictator (commander-in-chief). Camillus was escorted from Ardea to Veii. 
The Senones either found footprints left by Cominius Pontius or discovered a relatively easy ascent up the cliff. They climbed it and reached the summit of the Capitoline at night. They were not heard by the guards and the dogs. However, the geese sacred to the goddess Juno did and woke up the Romans. Marcus Manlius Capitolinus, a former consul, knocked down a Gaul who had reached the top. He fell on those behind him. Manlius also killed some Gauls who had laid aside their weapons to cling to the rocks. He was joined by the other soldiers and the enemy was repulsed. Manlius was commended for his bravery. Quintus Sulpicius wanted to court martial the guards who had failed to notice the enemy, but the soldiers prevented him from doing so. It was agreed to blame one man, who was thrown down the cliff. 
Famine began to afflict both armies. The Gauls were also affected by pestilence. They were on low ground between the hills, which had been scorched by the fires and there was malaria. Many of them died because of disease and the heat. They started piling the dead bodies and burning them instead of burying them. They started negotiations with the Romans and called on then to surrender due to the famine. They also hinted that they could be bought off. The Roman leaders, who were waiting for Camillus to arrive with an army from Veii, refused. Eventually, the starving soldiers called for a surrender or an agreement on a ransom on the best terms they could. Quintus Sulpicius and Brennus, the leader of the Senones, held talks. They agreed on a ransom of 1000 lbs. of gold. The Senones cheated, using heavier weights to weigh the gold. When the Romans protested, “Brennus tossed his sword on the scale, uttering words intolerable to the Roman ears, ‘Woe to the vanquished!’” 
Paying off the Senones to leave the city was a humiliation for the Romans. However, as Livy put it, “god and man forbade the Romans to be a ransomed people.” Before the weighing of the gold had been completed, Camillus reached Rome and ordered the gold not to be taken away. The Gauls said that an agreement had been made, but Camillus said that it had been struck by an official of lesser status than him and therefore invalid. Camillus then offered battle and the Senones were easily defeated. They were defeated again 13 kilometres (8 mi) to the east of Rome. Livy wrote the "slaughter was total: their camp was captured and not even the messenger survived to report the disaster." 
Account of Diodorus Siculus
In the account of Diodorus Siculus, which is much less detailed, the Senones spent the first day after the battle by the Allia cutting off the heads of the dead which, he claimed, was their custom. They then encamped by the city for two days. Meanwhile, the despairing inhabitants of Rome thought that the whole army had been wiped out and that there was no chance of resistance. Many of them fled to other towns. The leaders of the city ordered food, gold, silver and other possessions be taken to the Capitoline Hill, which was then fortified. The Senones thought that the noise in the city meant that a trap was being prepared. However, on the fourth day they broke down the city gates and pillaged the city. They made daily attacks on the Capitoline, but did not hurt any civilians. They suffered many casualties. Finding that they could not take it by force they decided to lay a siege. 
Meanwhile, the Etruscans raided the Roman territory around Veii, capturing prisoners and booty. The Roman soldiers who had fled to Veii ambushed them, put them to flight, seized their camp, regained the booty and took a large amount of weapons. The Romans reconstituted an army, gathering men who had dispersed in the countryside when they fled Rome, and decided to relieve the siege of the Capitoline Hill. Cominius Pontius was sent as a messenger to the Capitoline Hill to tell the besieged about this plan and that the men at Veii were waiting for an opportunity to attack. There was no mention of Camillus in the account of Diodorus Siculus. Pontius swam across the River Tiber and went up a cliff which was difficult to climb. After giving his message he returned to Veii. The Gauls noticed the track left by Pontius and ascended the same cliff. The Roman guards were neglectful of their watch and the Gauls escaped detection. When the geese made a noise, the guards rushed against the attackers. Diodorus called Manlius Capitolinus Marcus Mallius and wrote that he cut off the hand of the first Senone climber with his sword and pushed him down the hill. Since the hill was steep, all the enemy soldiers fell and died. After this, the Romans negotiated peace and persuaded the Gauls "upon receipt of one thousand pounds of gold, to leave the city and to withdraw from Roman territory." 
Account of Plutarch
Plutarch painted a greater picture of destruction and killings than Livy. The Gauls went to Rome on the third day after the battle. The gates were open and the walls were unguarded. They marched through the Colline gate. Brennus had the Capitoline Hill surrounded and went to the forum. He was surprised to see the men sitting outdoors and remaining quiet without fear when they were approached, "leaning on their staves and gazing into one another's faces." The Gauls hesitated to get close to them and touch them, regarding them as superior beings. However, one of them plucked up his courage and stroked the long beard of Papirius Marcus, who hit him hard on the head with his staff. The Gauls then killed all the men and sacked and burned the houses for many days. The defenders of the Capitoline Hill did not surrender and repulsed an attack. The Gauls killed everyone they captured, including women, children and the old.  Plutarch wrote that the Gauls entered Rome on the Ides of February (the 13th of February) and that the siege lasted seven months. 
Plutarch, too, wrote that some Gauls reached Ardea and that Camillus rallied the city against them and attacked them. On hearing this, the neighbouring cities called to arms the men of military age, especially the Romans who had fled to Veii. These wanted Camillus to be their commander, but refused to do so before he was legally elected. Plutarch then relayed the story of Pontius Cominius and his mission to the Capitoline Hill. He could not cross the bridge over the Tiber because the Gauls were guarding it, so he swam across supported by pieces of cork and went to the Carmental gate. When he reached the top of the Capitoline the senate appointed Camillus dictator. Camillus gathered soldiers from the allies and went to Veii, where there were 20,000 soldiers. 
After the episode of the geese of Juno the Gauls were less hopeful. They were short of provisions, but did not go foraging because they feared Camillus. They were also affected by disease because they were encamped amid ruins and there were dead bodies scattered everywhere. The wind scattered ash and this made breathing difficult. They were also suffering from the Mediterranean heat they were not accustomed to. The Gauls “were now whiling away the seventh month in its siege. For all these reasons the mortality was great in their camp; so many were the dead that they could no longer be buried.” The defenders of the Capitoline, in their turn, could not get news from Camillus because the city was closely guarded by the enemy. Famine worsened. They became dejected and agreed to pay a ransom. 
When Camillus arrived in Rome, he lifted the gold from the scales and said that it was Roman custom to deliver the city with iron, not with gold. He then said that the agreement to pay a ransom was not made legally and was not binding because it was made without him, who had been made the legal ruler. The Gauls now had to say what they wanted because “he [had] come with legal authority to grant pardon to those who asked it, and to inflict punishment on the guilty, unless they showed repentance.” Brennus begun a skirmish. The two sides could not fight a battle because no battle array was possible ‘in the heart of the ruined city.’ Brennus led his men to their camp and then left the city during the night. At dawn Camillus caught up with them and routed them, “[of] the fugitives, some were at once pursued and cut down, but most of them scattered abroad, only to be fallen upon and slain by the people of the surrounding villages and cities.” 
News of the Gallic sack reached Greece. Plutarch mentioned an inaccurate story by Heracleides Ponticus and that Aristotle wrote about the capture of Rome by the Gauls and said that the saviour of the city was "a certain Lucius," not Camillus. 
Modern assessment of accounts of the sack
The accounts of the battle of the Allia and the sack of Rome were written centuries after the events and their reliability is questionable. This may also account for the discrepancies between Livy and Diodorus Siculus with regard to the sack of the city.
The rescue of the city by Camillus is seen by many modern historians as an artificial addition to the story. Camillus was not mentioned by Diodorus Siculus and Polybius, another ancient Greek historian. Diodorus said that the Gauls were defeated at the Trausian Plain (an unidentified location) by an Etruscan army when they were on the way back from southern Italy.  Strabo wrote that they were defeated by Caere (the Etruscan city allied to Rome where the Vestal priestesses had fled) and that the Caerites recovered Rome’s ransomed gold.  This runs counter with the notion that Camillus stopped the payment of a ransom to the Senones. As already noted, Plutarch wrote that Aristotle said that Rome was saved by "a certain Lucius." This could be the Lucius Albinus who was said to have given the priestesses a lift to Caere. The role of Caere in the saga of the Gallic sack is unclear and it may be that this city played a bigger role than the one given in the Roman tradition.
There is also the question of what the Senones were doing in central Italy. Diodorus Siculus wrote that the Senones were "distressed and eager to move" because where they settled [the ager Gallicus] was too hot; they hence armed their younger men and sent them out to seek a territory where they might settle. Therefore, they invaded Etruria, and being in number some thirty thousand they sacked the territory of Clusium.  However, Cornell finds this unconvincing. All through the story the Senones appear to be a warrior band. There is no mention in any of the accounts of wives and children, who would have been present if these Gauls had been a migrating people in search for land. Cornell thinks that they were mercenaries. A few months after the sack of Rome, Dionysius I of Syracuse, the tyrant of the Greek city of Syracuse, in Sicily, hired Gaul mercenaries for a war in the south of Italy. It may well be that the Senones were on their way to the south because of this. The story of their defeat on their way back from the south seems to fit with this hypothesis. It could also be that the Senones went to Clusium because they were hired by one of two political factions at loggerheads to intervene in political struggles in this city, rather than the romanticised story of Aruns' revenge for his wife. 
Rome under attack
389-366 BC: Relations with the Latin League and Hernici worsen
The Gallic sack was a humiliation for Rome and set in motion a series of wars against nearby peoples. Rome, in conjunction with the Latin League, a coalition of other Latin cities, and the Hernici had spent much of the 5th century fighting against the Volsci and Aequi, who lived to the south, in response to the latter's attacks on their territory. Immediately after the sack there were attacks by the Volsci and the Etruscan city-states in southern Etruria. Rome responded aggressively. This led to a breakdown of her alliances with the Latin League and the Hernici and rebellions by a number of Latin cities. Rome spent the next thirty-two years fighting the Volsci, the Etruscans and the rebel Latin cities.
In 389 BC the Volsci took up arms and encamped near the Latin city of Lanuvium. Camillus defeated them and laid "waste all the Volscian countryside, which forced the Volsci to surrender." Livy wrote that with this Rome "acquired undisputed control" of the Pomptine Marshes in the southern part of the Volscian territory. However, the Volsci subsequently continued to fight. Camillus then moved against the Aequi who were preparing for war and defeated them, too. The Etruscans captured the colony of Sutrium in southern Etruria and Camillus repelled them. In 388 BC the Romans laid waste the territory of the Aequi to weaken them and carried out incursions into the territory of the Etruscan city-state of Tarquinii, capturing and destroying Cortuosa and Contebra. In 386 BC the Volscian of the town of Antium gathered an army which included Hernici and Latin forces near Satricum (not far from Antium). A battle with the Romans was stopped by rain, after which, the Latins and Hernici returned home. The Volsci retreated to Satricum, which was taken by storm. In 386 BC the Etruscans seized Sutrium and Nepet, two Roman colonies in southern Etruria. The Romans asked the Latins and Hernici why they did not provide Rome with soldiers as they were supposed to under the alliances mentioned above. Both replied that this was due to "their constant fear of the Volsci." They also said that their men who had fought with the Volsci had done so of their own volition and not under the orders of their councils. However, it was clear that Rome’s aggressive actions had caused them to defect and become hostile. In 385 BC there was another war with the Volsci who were supported by the rebelling Latins and Hernici plus the Roman colony of Circeii and Roman colonists from Velitrae. This force was defeated and most of the prisoners were Latins and Hernici. The Romans planted a colony with 2000 colonists at Satricum.
In 383 BC the Latin city of Lanuvium rebelled. The Roman senate decided to found a colony at Nepet in southern Etruria and to allot land in the Pomptine Marshes to the Roman poor to gain popular support for a war. However, there was no war due to an epidemic. This prompted the Romans at Velitrae and Circeii to sue for pardon, but they were dissuaded by the rebels, who also encouraged pillaging in Roman territory. The Latin city of Praeneste also became rebellious and attacked the territories of the Latin towns of Tusculum, Gabii and Labici, which were Roman allies. In 382 BC the Romans attacked and defeated a rebel force in which men from Praeneste almost outnumbered the force of the Roman colonists near Velitrae. The Romans did not attack the town because they were unsure about being successful and did not think it was right to exterminate the Roman colony. 
Still in 382 BC Rome declared war on Praeneste, which joined the Volsci. This joint force took the Roman colony of Satricum despite strong resistance by the Roman colonists. In 381 BC the Romans levied four legions and marched on Satricum. There was a fierce battle which the Romans won. There were men from Tusculum among the prisoners; thereafter, Tusculum broke its alliance with the Romans and Rome declared war on it. However, when the Romans entered its territory, Tusculum did not fight and was granted peace. In 380 BC the Praenestines marched into the territory of Gabii. Then they advanced against Rome’s walls at the Colline Gate and encamped near the River Allia, where the Gauls had defeated Rome. The Romans defeated them and marched into the territory of Praeneste, seizing eight towns under its jurisdiction, and then seized Velitrae. Finally, they confronted Praeneste, the heart of the rebellion, which surrendered. In 378 BC the Volsci ravaged the borders of Roman territory. The Romans sent an army to Antium on the coast and another to Electra and the mountains and applied a scorched earth policy. In 377 BC a joint Latin and Volscian force encamped near Satricum. The Romans levied three armies: one was a reserve legion, one defended the city and the third, the largest, marched on Satricum. The enemy were routed and fled to Antium. A quarrel now broke out between the Antiates and the Latins. The former were inclined to give up, while the latter did not and left. The Antiates surrendered their city and lands. The Latins burned Satricum in revenge. Then they attacked Tusculum, which was rescued by the Romans. 
In 370 BC the Roman colonists of Velitrae made several incursions into Roman territory and besieged Tusculum, knowing that Rome did not have an army because the plebeian tribunes had paralysed the Roman state. Thereafter, the tribunes allowed the election of heads of state and the levy on an army, which drove the rebels from Tusculum and laid in a protracted siege on Velitrae. Livy did not state when it ended, but it must have been in 366 BC. In 367 BC the rebels arrived in Latium. An aging Camillus defeated them near the Alban Hills, and most of the rebels then fled to Apulia. 
366-358 BC: End of hostilities with the Latins and Hernici
In 366 BC there were reports of a defection of the Hernici. In 362 Rome declared war on them. The Romans were ambushed and routed. The consul who led the army died in the battle and the Hernici surrounded the Roman camp. The Romans sent a relief force and the Hernici were defeated in a tough battle. In 361 BC the Romans seized Ferentinum, a town of the Hernici. When they were on their way back, the people of the Latin city of Tibur shut the city gates on them. In 360 BC the Gauls encamped near the River Anio. After some skirmishes the conflict was resolved by a single combat between Titus Manlius and a Gaul, which the former won. The Gauls left, went to Tibur and allied with it, receiving supplies from the city. Then the Gauls went on to Campania. In 360 BC the Romans attacked Tibur, prompting the Gauls to return in order to render aid. They then ravaged the territories of Labici, Tusculum and Alba Longa. The Romans kept an army at Tusculum and fought the Gauls with another one not far from Rome's Colline gate. After a tough battle, the Gauls went to Tibur again. The two allies were defeated by the two Roman armies. A third Roman army defeated the Hernici in a major battle. In 359 BC a small force from Tibur arrived at the walls of Rome, but it was repelled easily. In 358 BC the Etruscan city of Tarquinii plundered Roman territory by Etruria. The Romans levied an army against them and one against the Hernici. 
That year, the war with the Latins and Hernici ended. Peace with the Latins was prompted by rumours of a Gallic war. The Latin League renewed the alliance with Rome they had made in 493 BC (the foedus Cassianum) which had lapsed shortly after the Gallic sack of Rome and the subsequent rebellions by a number of Latin cities. The Latin League provided Rome with soldiers. Thus, the Gauls were the cause of both the falling out between these two parties after the sack of Rome and their reconciliation in 358 BC. The Gauls went to Praeneste and encamped near Pedum. The Roman commander, Gaius Sulpicius, delayed engaging in battle to wear down an enemy which had no food supplies in unfriendly territory and "whose strength and courage lay wholly in attacking, and languished as soon as there came a slight delay." Eventually the Gauls provoked a battle which the Romans won. Another Roman army defeated the Hernici and reduced them to subjection. Meanwhile, a third Roman army was defeated by Tarquinii, which killed 307 captured Roman soldiers as a sacrifice. The city of Falerii had sided with Tarquinii, but refused to hand over Roman soldiers who had fled there from the battle. Velitrae and the Volscian city of Privernum devastated the Roman fields with sudden raids. 
357-345 BC: Further conflict in the region
Although the conflict with the Latin league and the Hernici had ended, there were still troubles with the Volsci, Tibur and the Etruscans. In 357 BC Rome ravaged the territory of Privernum and then attacked the city, which surrendered. In 356 BC a Roman army pushed a force from Tibur into their city and pillaged its fields. Another army was routed by Tarquinii and Falerii. A coalition of Etruscan city-states led by these two cities advanced to the salt works. The Romans crossed the River Tiber on rafts and seized the enemy camp by surprise, captured 8000 prisoners and drove the Etruscans out of Roman territory. In 354 BC The Romans seized Empulum which was in the territory of Tibur and ravaged lands which belonged to Tarquinii. In 353 BC they took Sassula which also belonged to Tibur and this city-state surrendered. They also routed the army of Tarquinii, taking many prisoners. They picked 158 noblemen among them, took them to Rome, scourged them and beheaded them in revenge for the Romans who had been sacrificed by the Tarquinenses. In 353 BC the Etruscan city of Caere, which had helped Rome during the Gallic sack of Rome, allied with Tarquinii. The Etruscans pillaged the area near the salt works and took their booty in the territory of Caere. The Volsci attacked Roman territory. Caere sent envoys to Rome to beg forgiveness, claiming that it was some country people who joined the pillaging and that the city had not prepared for war. Rome accepted peace and granted a 100-year truce. The Romans turned their attention to Falerii. They did not encounter any armies and pillaged the countryside, sparing the towns. 
In 350 BC there were troubles with the Gauls and a Greek fleet. A huge army of Gauls had encamped in Latium. The Romans levied an army of four legions led by a consul and a praetor. They encamped on a height close to the Gallic camp and then defeated them. The Roman consul, who was wounded, did not pursue the fugitives, who fled to the Alban Hills. In 349 BC the Gauls came down from the hills and ravaged the coastal plain. The Greeks carried out naval attacks on the coast from the mouth of the River Tiber to Antium. The Gauls and Greeks happened to encounter each other and a battle ensued, following which the former withdrew to their camp and the latter to their ships. The Latin League refused to provide Rome with soldiers. The Romans enlisted men everywhere in their territory, including the countryside, and levied ten legions with 4200 infantry each. One of the two consuls died and the other consul took sole charge of the war. He left two legions in the city to defend it and shared the command of the other eight with a praetor, who was put in charge of preventing the Greeks from landing. The consul encamped in the Pomptine Marshes. His aim was to prevent the Gauls from obtaining their sustenance through plunder. There was a single combat between a Gaul and a Roman which the latter won. This was followed by a battle which the Romans won. The Gauls scattered among the Volsci and then some of them went to Etruria and some went to Apulia. The consuls then joined the other legions to deal with the Greek fleet. There was no battle and the Greek were kept off shore. Eventually, the Greeks ran out of water and left.
In 348 and 347 BC there was peace. In 346 BC the Volsci of the city of Antium sent envoys to the cities of the Latins to try to stir up a war. The Romans attacked Satricum, which the Volsci had rebuilt two years earlier. They defeated an army of Antiates and other Volsci which had been levied in advance, which fled to Satricum. The Romans besieged the town and 4000 of the enemy surrendered, after which the victorious army burned down the town. In 345 BC the Aurunci carried out an unexpected raid. It was feared that it was a joint design with the Latin League. The Romans defeated the Aurunci in a single battle. They then made a surprise attack on the Volsci and seized the town of Sora.
Modern evaluations of these conflicts
Some modern historians follow Beloch who dismissed the Roman victories soon after the sack. One reason is that they are not mentioned by the Greek historians Diodorus Siculus and Polybius. The other is the assumption that Rome had been damaged too much to be so successful militarily. Livy said that the city was burnt, and that it then developed a haphazard layout because it was rebuilt hastily. However, Cornell notes that Diodorus Siculus and Polybius made only scarce references to this period. He also disputes the extent of the damage suffered by Rome. He points out that there is no archaeological trace of the damage of the sack. Signs of burning which were thought to be dated to this event have subsequently been dated to the rebellion which brought down the Roman monarchy more than a century earlier. Cornell thinks that Senones ransacked the city, but were only interested in booty, left most of the buildings alone and went when they were bought off. It was common for the layout of ancient cities to be haphazard. He adds that Rome’s recovery was aided by cementing the newly conquered territory of Veii by granting its inhabitants citizenship without the right to vote and by a strengthening of the alliance with Caere, which had helped Rome during the Gallic sack. After the initial setback and attacks Rome resumed her expansionism of the late 5th and early 4th centuries.
Rome rebuilds her city walls
A few years after the sack, Rome began to build new city walls using ashlar masonry from a quarry in the territory of Veii. This was a huge undertaking. It was 11 kilometres (7 mi) long and took twenty-five years to complete. The original wall had been built in capelaccio tuff, the local stone which was rather poor quality as it was quite friable. The wall was rebuilt with a type of yellow tuff which is named Grotta Oscura after its main quarry, which was of much better quality and was in the territory of Veii. Thus, the acquisition of Veii provided Rome with better masonry for construction. The new rock was harder and therefore harder to work.
Fear of the Gauls
The Gallic sack led to a long-lasting and profound fear of the Gauls in Rome. In 350 BC and 349 BC unspecified Gauls attacked Latium. These were probably marauding raids. On the second occasion Marcus Valerius Corvus was said to have fought a duel with a Gallic champion.  Polybius said that Rome made a peace with the Gauls, who did not return for thirty years.  Despite Rome defeating the Senones in the Battle of Sentinum (295 BC) during the Third Samnite War (298-290 BC), popular fear of the Gauls persisted. In 228, 216 and 114 BC fears of Gallic attacks led to the Romans performing human sacrifices by burying alive a pair of Gauls and a pair of Greeks, even though human sacrifice was not a Roman custom. Presumably this was to avert the danger of Gallic disaster. 
Legend about Brennus
The Historia Regum Britanniae, a medieval work written c. 1136 by Geoffrey of Monmouth on the legendary kings of Britain, states that Brennus led both Britons and Gauls. He besieged Rome for three days until his brother came to aid in the invasion. The Romans defended the city for many days and were successful in repelling the invaders. Finally, the two consuls put on armour and joined the men defending the city. They pushed the invaders back but Belinus was able to reform the lines and stop the attacks. Brennus and Belinus continued forward until the walls were breached and the Britons and Gauls invaded the city. According to this story Brennus stayed in Rome and ruled ruthlessly for the rest of his days, although this seems highly unlikely.
- Plutarch, the life of Camillus, 14.4
- Diodorus Siculus, The Library of History, 14,114.1
- Cary, M. and Scullard, H.H., A History of Rome: Down to the Reign of Constantine
- Diodorus Siculus, The Library of History, 14,114.3
- Berresford Ellis, P., Celt and Roman, p. 10
- Dionysus of Halicarnassus, Roman Antiquities, 13.12
- Plutarch, The life of Camillus, 18.4
- Berresford Ellis, P., Celt and Roman, p. 10
- Plutarch, the life of Camillus, 14.4
- Cary, M. and Scullard, H.H., A History of Rome: Down to the Reign of Constantine
- Plutarch, Parallel Lives, Camillus, 19.1, 22.1 
- Tacitus, The Histories, 2.91 
- Livy, The History of Rome, 5.33
- Livy, The History of Rome, 5.36 
- Dionysus of Halicarnassus, Roman Antiquities, 13-10-12 
- Livy, The History of Rome, 5.37
- Plutarch, Parallel Lives, Camillus, 18.4
- Dionysus of Halicarnassus, Roman Antiquities, 13.12
- Diodorus Siculus, The Library of History, 14,114.3 
- Cary, M. and Scullard, H.H., A History of Rome: Down to the Reign of Constantine
- Berresford Ellis, P., Celt and Roman, p. 10
- Livy, 9.30
- Livy, The History of Rome, 10.11, 14, 18, 26-27
- Fraccaro P, in Atti II del Congresso nazionale di studi Romani 3, 1931, pp. 91-7
- Cornell T.J, The Beginnings of Rome, p. 207
- Beloch, Romische Geschichte bis zum Beginn der punischen kriege, 1926, p. 320
- Livy, The History of Rome, 5.38
- Livy, The History of Rome, 5.38-39
- Diodorus Siculus, Library of History, 14.115.2
- Plutarch, Parallel Lives, Camillus, 14.18-6-7
- Livy, Livy, The History of Rome, 5.39-40
- Livy, The History of Rome, 5.41.7-10
- Livy, The History of Rome, 42, 43, 45.1-4
- Livy, The History of Rome, 5.46.1-3
- Livy, The History of Rome, 5.45.4-8, 46.3-7
- Livy, The History of Rome, 5.47
- Livy, The History of Rome, 5.48
- Livy, The History of Rome, 5.49
- Diodorus Siculus, Library of History, 14.115
- Diodorus Siculus, Library of History, 14.116
- Plutarch, Parallel Lives, Camillus, 22.1, 4-6
- Plutarch, Parallel Lives, Camillus, 30
- Plutarch, Parallel Lives, Camillus, 23-29.1
- Plutarch, Parallel Lives, Camillus, 28
- Plutarch, Parallel Lives, Camillus, 29
- Plutarch, Parallel Lives, Camillus, 22.3
- Diodorus Siculus, Library of History, 15.4
- Strabo, Geographica, 5.2.3
- Diodorus Siculus, Library of History, 113.3
- Cornell, The Beginnings of Rome, pp. 313-18
- Livy, The History of Rome, 6.2.9-14; 3; 4., 8-10; 5.; 7.1; 8; 9.3,7-12; 10.6-8;12.6; 13; 15.6-7 
- Livy, The History of Rome, 6.21; 22.2
- Livy, The History of Rome, 6. 22.4, 8; 23-24.11; 25, 26.8, 27.10; 28-5-8, 29.6-7; 31.5-8; 32.4-10; 33
- Livy, The History of Rome, 6.36.1-5; 42.4-8
- Livy, The History of Rome, 7.1.3; 6.7,9; 7-9.1,6-10;10; 11.1, 5-8; 12.1-4, 7; 10-11.1-8, 12.1-6 
- Livy, The History of Rome, 12-6.12; 13-15.1-11
- Livy, The History of Rome, 7.16.2-6; 17.2-9; 18.2; 19.2-4, 6-9; 20
- Livy, The History of Rome, 7.23; 24.1-9; 25; 26
- Livy, The History of Rome, 7.27.5-9; 28.1-6
- Beloch, Romische Geschichte, pp. 314-20
- Cornell, The Beginnings of Rome, pp. 318-19
- Livy, The History of Rome, 7.26
- Polybius, The Histories, 2.18.19
- Cornell, The Beginnings of Rome, p. 325
- Primary sources
- Dionysus of Halicarnassus, The Roman Antiquities of Dionysius of Halicarnassus, Aeterna Press, 2015; ISBN 978-1785165498
- Diodorus Siculus, Library of History, Volume 3, Books 4,59-8 (Loeb Classical Library), Loeb, 1989; ISBN 978-0674993754 
- Livy, The Early History of Rome, Books. 1-5, Penguin Classics, revised edition, 2002; ISBN 978-0140448092 Book 5  Book 6  Book 7 
- Plutarch, Plutarch's Lives Volume I, Rarebooksclub.com, 2013; ISBN 978-1236726704 
- Secondary sources
- Berresford Ellis, P., Celt and Roman, Palgrave Macmillan, 1998; ISBN 978-0312214197
- Cary, M. and Scullard, H.H., in A History of Rome: Down to the Reign of Constantine, Palgrave Macmillan, 3rd edition, 1980; ISBN 978-0333278307
- Cornell T.J., The Beginnings of Rome (The Routledge History of the Ancient World), Routledge, 1995; ISBN 978-0415015967