Rome nevertheless divests Egypt of Cyprus the next year, when the Roman demagogue Clodius Pulcher annexes the island—driving its king to suicide when his brother in Egypt fails to support him—to pay for his massive grain distributions in Rome.

Cato the Younger is sent by a law of Clodius to oversee the annexation of the island.

Marcus Junius Brutus—whose mother, Servilia, is a half-sister of Cato the Younger and reputed mistress of Caesar—is adopted by Quintus Servilius Caepio and takes the name Quintus Caepio Brutus.

Brutus in 58 at the age of about twenty-seven accompanies Cato to Cyprus.

The Helvetii have planned and prepared themselves for three years, and emissaries have been sent out to various Gallic tribes assuring safe passages and alliances.

In 58 BCE, Orgetorix's ambitions are declared a ruse for personal power; this rumor is celebrated among the enemies of the Helvetii, especially those of Roman clientele.

This succeeds in causing confusion and feuds among the tribes, based mainly on the merits of Orgetorix versus his vices.

The conspiracy is denounced; Orgetorix is called to a hearing in chains before the government of the Helvetii.

There is an effort to seize him at council, however he is protected by his retinue and bodyguards.

During the preceding seasons he had called up a sizable force of men-at-arms and vassals said to have numbered ten thousand men, this in addition to his armed entourage.

Orgetorix is able to escape capture by his rivals and the councils labor at length to resolve the confusions and disputes; however, Orgetorix is murdered or slain during a dispute within his own encampment With many conflicts of interest settled, the Helvetii once again return to their long planned migration to safer pastures among the Santones tribe on the Atlantic seaboard.

Caesar dates their departure to the twenty-eighth of March, and mentions that they burned all their towns and their villages so as to discourage thoughts among undecided client tribes or enemies to occupy their vacated realm.

The Helvetii retain and arm their client tribes: the Rauraci, the Tulingi, the Latovici, and the Boii, from whom they have hired a contingent of horsemen.

There are two available routes for them: the first one is the difficult and dangerous Pas de l'Ecluse, located between the Jura mountains and the Rhône River.

The second, easier one will lead them to the town of Geneva, where Lake Geneva flows into the Rhone River and where a bridge allows passage over the river.

These lands belong to the Allobroges, a tribe that had been subdued by Rome, and are under the control of the Roman republic.

Meanwhile, Caesar is in Rome, and only a single legion is in Transalpine Gaul, the endangered province.

As he is informed of these developments, he immediately hurries to Cisalpine Gaul, leaving his single legion under the command of his second-in-command Titus Labienus.

Upon arrival, he takes command of the three legions which were in Aquileia and enrolls two new legions, the Legio XI and the Legio XII.

At the head of these five legions, he travels the quickest way through the Alps, crossing territories of several hostile tribes and fighting several skirmishes en route.

Arriving in Geneva, he orders a levy of several auxiliary units and the destruction of the bridge.

The Helvetii send an embassy under the new leadership of Nammeius and Verucloetius, to negotiate a peaceful passage, promising to do no harm.

Caesar stalls the negotiations while his troops fortify their positions behind the river with a sixteen foot high rampart and a parallel trench lined with ballistas; his legionaries are backed by mercenary archers and slingers and Caesar has also hired and/or conscripted a contingent of Gallic horseman from the Remi.

As the embassy returns, Caesar officially refuses their request and warns them that any forceful attempt to cross the river will be opposed.

Several attempts are quickly beaten off.

The Helvetii turn back and enter negotiations with the Sequani to let them pass in a peaceful manner.

Gaius Julius Caesar ends his consulship in Rome in 58 BCE.

Due to the costs of consulship, Caesar is still deeply in debt, and there is money to be made as a governor, whether by extortion or by military adventurism.

Having secured the governorship of both Cisalpine Gaul and Transalpine Gaul, Caesar initially has four veteran legions under his direct command: Legio VII, Legio VIII, Legio IX Hispana, and Legio X.

As he had been governor of Hispania Ulterior in 61 BCE and had campaigned successfully with them against the Lusitanians, Caesar knows personally most (perhaps even all) of these legions.

Caesar also has the legal authority to levy additional legions and auxiliary units as he sees fit.

His ambition is to conquer and plunder some territories to get himself out of debt, and it is likely Gaul was not his initial target, but that he was instead planning a campaign against the kingdom of Dacia located in the Balkans.

The nations of Gaul are civilized and wealthy.

Most have contact with Roman merchants and some, particularly those that are governed by Republics such as the Aedui and Helvetii, have enjoyed stable political alliances with Rome in the past.

Two of Caesar’s provinces border on unconquered territory, and parts of Gaul are known to be unstable.

Some of Rome's Gallic allies have been defeated by their rivals, with the help of a contingent of Germanic tribes.

The Romans fear these tribes are preparing to migrate south, closer to Italy, and that they have warlike intent.

The threat of invasion by the Helvetii, a German-Celtic tribe from the area that is now Switzerland, gives Caesar a pretext to advance his career through war.

His personal ambitions extending far beyond his proconsulship of Cisalpine and Transalpine Gaul, Caesar goes to war in Gaul, ostensibly to protect the Roman republic's Mediterranean holdings.

The majority of the Gallic tribes congratulate Caesar following his victory over the Helvetii, and seek to meet with him in a general assembly.

Diviciacus, the head of the Aeduan government and spokesmen for the Gallic delegation, expresses concern over Ariovistus’ conquests and the hostages he has taken.

Diviciacus demands that Caesar defeat Ariovistus and remove the threat of a Germanic invasion otherwise they would have to seek refuge in a new land.

Not only does Caesar have a responsibility to protect the long-standing allegiance of the Aedui, but this proposition presents an opportunity to expand Rome’s borders, strengthen the loyalty within Caesar’s army and establish him as the commander of Rome’s troops abroad.

As the Senate had declared Ariovistus a “king and friend of the Roman people” in 59 BCE, Caesar cannot declare war on the Suebi tribe.

Caesar, saying that he cannot ignore the pain the Aedui have suffered, delivers an ultimatum to Ariovistus demanding that no German cross the Rhine, the return of Aedui hostages and the protection of the Aedui and other friends of Rome.

Although Ariovistus assures Caesar that the Aedui hostages will be safe as long as they continue their yearly tribute, he takes the position that he and the Romans are both conquerors and that Rome has no jurisdiction over his actions.

With the attack of the Harudes on the Aedui and the report that a hundred clans of Suebi are trying to cross the Rhine into Gaul, Caesar has the justification he needs to wage war against Ariovistus in 58 BCE.

Learning that Ariovistus intends to seize Vesontio, the largest town of the Sequani, Caesar commences marching his troops toward Vesontio.

Some of Caesar’s officers hold their posts for political reasons only and have no war experience.

As a result, they suffer from poor morale which threatens Caesar’s campaign.

Caesar challenges the officers and their legions, saying that the only legion he can trust is the Tenth.

With their pride on the line, the other legions follow the Tenth’s lead, determined not to be outdone.

Consequently, Caesar arrives in Vesontio before Ariovistus.

They meet and rout the Germanic army in the land between the city and river, effecting a massacre as the Germans try to escape over the river.

Most of Ariovistus’ hundred and twenty thousand men are killed.

Some, including Ariovistus himself, manage to cross the river in boats or by swimming.

The rest are cut down by Roman cavalry, including both of Ariovistus's wives and one of his daughters; another daughter is taken prisoner.

Ariovistus and what remains of his troops escape and cross the Rhine, never to engage Rome in battle again.

Both Caesar's emissaries are rescued unharmed, to relate their harrowing adventures as the Germans debated (in their presence) whether they should be burned then or later.

Caesar said that encountering Procillus and freeing him from his chains gave him as much pleasure as the victory, which offers some insight into the emotional climate of Caesar's forces; the officers were a sort of family.

The fate of the twenty-four thousand Harudes is not known.

The Suebi encamped near the Rhine return home.

Caesar is victorious.

Caesar’s Campaign Against the Helvetii (58 BCE): The Battle of Bibracte and Its Aftermath

In 58 BCE, the Helvetii had already crossed the territories of the Sequani and were pillaging the lands of the Aedui, Ambarri, and Allobroges. These tribes, unable to oppose the migrating Helvetian coalition, sought assistance from Julius Caesar, their Roman ally.

Caesar’s Initial Engagement at the Battle of the Arar

• The Cimbri's Helvetian descendants, seeking new lands, attempted to migrate en masse through Gaul into Roman-controlled regions.
• Caesar intercepted them as they were crossing the River Arar (modern Saône), surprising a quarter of their forces, the Tigurini clan, who had not yet crossed.
• Three Roman legions swiftly attacked and defeated the Tigurini, forcing the survivors to flee into the nearby forests.
• After the victory, the Romans constructed a bridge over the Saône, continuing their pursuit of the main Helvetian force.

Failed Negotiations and the Roman Pursuit

• The Helvetii sent an embassy, led by Divico, to negotiate with Caesar. However, the talks failed, and the migration continued.
• For two weeks, the Romans shadowed the Helvetian column, attempting to halt their movement.
• Caesar ordered 4,000 cavalry (Roman and Aedui allied riders) to track and harass the Helvetii, but they were unexpectedly defeated by just 500 Helvetian cavalry, exposing weaknesses in Rome’s auxiliary forces.

Dumnorix and the Aedui Betrayal

• Supplies promised to the Romans by their Aedui allies were delayed, likely due to Dumnorix, an influential Aeduan leader with Helvetian sympathies.
• Facing logistical difficulties, Caesar diverted his army to Bibracte, the Aedui capital, to obtain food and regroup.

The Battle of Bibracte (June 20, 58 BCE)

• The Helvetii, learning of Caesar’s movement from deserters, turned back to harass his rear guard.
• Caesar deployed his army in triplex acies (the standard triple battle line) at the base of a hill near Bibracte, securing his baggage train at the top.
• The Seventh, Eighth, Ninth, and Tenth Legions formed the front battle line, while the Eleventh and Twelfth Legions, along with auxiliaries, guarded the summit.

Phases of the Battle

1. Initial Roman Defense and Counterattack

   • The Helvetii charged uphill but were repelled by a hail of pila (javelins) thrown from a distance of 10–15 yards.
   • The legions counterattacked, forcing the Helvetii to retreat a thousand paces back to their baggage train.

2. Reinforcements Arrive

   • The Boii and Tulingi, allies of the Helvetii, entered the battlefield with 15,000 warriors, attacking the Roman flank.
   • The Helvetii regrouped and returned to the fight, creating a two-front engagement.

3. Roman Tactical Adaptation

   • To counter the flanking maneuver, Caesar redeployed his third line, keeping the primary and secondary battle lines engaged with the retreating Helvetii.
   • The Romans fought for many hours into the night before finally capturing the Helvetian baggage train, securing a decisive victory.

The Aftermath of the Battle

• The Helvetii and their allies fled into the night, suffering catastrophic losses.
• According to Caesar’s account:
  • 368,000 Helvetii and allies had originally set out.
  • 92,000 were able-bodied warriors.
  • 110,000 survivors remained to return home.
  • 238,000 had been killed or captured.
• Caesar rested his legions for three days, then pursued the fleeing Helvetii, who had reached the territory of the Lingones.
• Caesar issued a warning to the Lingones not to aid the Helvetii, forcing them to surrender unconditionally.

Final Resolution and Roman Strategy

• The Helvetii, Boii, and Tulingi survivors were ordered to return to their homeland to rebuild their settlements.
• Rome provided them with supplies, ensuring they remained a buffer state against future Germanic incursions.
• A faction of 6,000 Helvetii (Verbigeni) attempted to flee but were captured and executed by other Gallic tribes at Caesar’s orders.
• A census written in Greek was discovered in the captured Helvetian camp, confirming the demographic scale of the migration.

Significance of the Battle of Bibracte

• Rome’s victory secured its dominance in Gaul, allowing Caesar to turn his attention to other Gallic tribes.
• The defeat of the Helvetii demonstrated the effectiveness of Roman military tactics, particularly the triplex acies formation and logistical strategy.
• The Helvetian migration served as a prelude to the Gallic Wars, in which Caesar would conquer all of Gaul within the next seven years (58–51 BCE).

The Battle of Bibracte was a key moment in Roman expansion, marking the beginning of Caesar’s conquest of Gaul and setting the stage for his rise to power in Rome.

The Xiongnu, as their economic and military situation deteriorated, had been willing to renew peace during the reigns of Huyandi Chanyu (r. 85-69 BCE) and Xulüquanqu Chanyu (r. 68-60 BCE), but the Han court had given only one option, tributary submission.

After Xulüquanqu Chanyu's death in 60 BCE, a Xiongnu civil war had broken out in 57 BCE over the succession, which fully fragments the Xiongnu confederation with many contenders.

In the end, only Zhizhi Chanyu and Huhanye Chanyu survive the struggle to power.

After Zhizhi Chanyu (r. 56–36 BCE) inflicts serious losses against his rival Huhanye Chanyu (r. 58–31 BCE), Huhanye and his supporters debate whether to request military protection and become a Han vassal.

In 53 BCE, Huhanye decides to do so and surrenders to the reign of the Han empire.

Huhanye sends his son as a hostage to the Han capital in 53 BCE and personally pays homage to Emperor Xuan in 51 BCE.

Huhanye makes a second visit two years later.

With Han assistance, his strength grows, and Zhizhi, who had previously been stronger, is now forced to move west.

Burebista, king of the Dacians, conquers the economically important Greek cities on the Black Sea coast, from Apollonia to Olbia, after 55, forcing the retreat of the Scythians to …

…the lands east of the Dniester River.

The Geto-Dacian walled city of Pecica is built during the reign of Burebista.

The Middle East: 57–46 BCE

The Parthian Conflict and Roman Setbacks

The era from 57 to 46 BCE marks a critical period in Roman-Parthian relations, characterized by ambitious Roman expansion attempts and significant military setbacks. In 53 BCE, the Roman general Marcus Licinius Crassus, a member of the influential First Triumvirate alongside Julius Caesar and Pompey, leads a major invasion into Mesopotamia, aiming to extend Roman dominance into Parthian territories.

Crassus's campaign ends in disaster at the Battle of Carrhae, where he and his son Publius suffer devastating defeat and death at the hands of Parthian forces under General Surena. This catastrophic Roman loss is considered the worst since the famed Battle of Cannae during the Punic Wars, dramatically altering the political dynamics within Rome itself.

Crassus’s defeat directly contributes to the collapse of the First Triumvirate, exacerbating tensions that eventually ignite the civil wars between Julius Caesar and Pompey. Exploiting Roman vulnerability, the Parthians launch a series of raids into Syria the following year (52 BCE), capitalizing on the confusion and diminished Roman military presence.

In 51 BCE, the Parthians escalate their aggression with a major invasion of Syria, but this advance is effectively halted when Roman forces ambush and decisively defeat them near Antigonea. The Romans, rallying after the humiliation at Carrhae, manage to drive back the Parthians and temporarily secure the volatile frontier.

Thus, this era (57–46 BCE) encapsulates a pivotal moment of Roman vulnerability in the Near East, demonstrating both the limits of Roman power against the formidable Parthian Empire and setting the stage for prolonged future confrontations between these two great ancient powers.