jul 31, 88 BC - 88 BC - Battle of Chaeronea in central Boeatia, Sulla defeats Mithridates' general Archelaus

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The Battle of Chaeronea was fought by the Roman forces of Lucius Cornelius Sulla and Mithridates' general, Archelaus, near Chaeronea, in Boeotia, in 86 BC during the First Mithridatic War. The battle ended with a complete rout of the Pontic army and a decisive victory for the Romans.

Pontic troops
One of Mithridates generals, Taxiles, and a large force were sent to join up with Archelaus and his forces in the Elatean plains.[4][5] Baker cites a Roman army of less than 17,000 thousand, excluding allied troops, and the enemy Pontic army outnumbering those troops 5 to 1, or around 85,000 troops.[6] Delbruck presents both a "supposed" figure of 120,000 troops and a reduced figure of a "more modest" 60,000 Asiatics.[1] Delbruck further makes comments on the available primary sources and specifically refers to "vague and boastful" memoirs of Sulla which were the primary source that other historians of the time used, such as Plutarch.[1] Hammond preferred the figure of 60,000 soldiers, which is supplied by Memnon of Heraclea.[7] The Pontic forces are also said to have had 90 scythed chariots.[8]

Mithridates' armies were a compound make-up of Greek and Oriental elements, the infantry was made up of Macedonian style phalanxes, with Pontic phalangists for missile units, and the cavalry a combination of horse and scythe-wheeled chariots.[9]

Sulla's forces are approximated to have been around 30,000 men,[1][2] with Baker commenting that of these less than 17,000 were Romans and the rest were composed of Macedonian and Greek allies.[10] Baker, however, doesn't give a concrete value for the number of Macedonian and Greek soldiers involved in the battle, merely noting a disparity of "over three to one" between the Roman and Pontic troops once the allies are accounted for.[10] The Roman forces were composed of veteran Roman legions and some cavalry.[2][11]

Sulla advanced his army from Athens and into Boeotia, where he met up with Hortensius, who had advanced southward from Thessaly, at Philoboetus.[4][5] Hortensius himself had moved through the mountains with a guide, intent on avoiding an ambush.[4][5] Baker remarks that this movement put Sulla in a favourable position, his supplies were secure, wood and water were plentiful, the roads into Thessaly could be watched and guarded with ease, and the hills provided an advantage.[4][5] Baker describes this position as "commanding the Elatean plain and the valley of Cephisus."[4] Sulla was determined to dictate the time and place of the battle.[10]

Taxiles and his large force had to go north through a defile, before turning into the narrower valley, between Orchomenos and Chaeronea to meet up with Archelaus and his forces.[4][5] The consequence of this was that once Taxiles and his forces arrived, it became impossible for the forces to retreat and instead had to stand and fight.[4] This force was encamped in the valley in a position which allowed the commanders to watch the Roman army.[10] Archelaus intended to pursue a war of attrition, Taxiles with his far larger force, however, was determined to defeat the Romans in battle and insisted on an engagement and, given the circumstances, Archelaus was in no position to refuse.

The Pontic forces, encamped in the valley, sent out numerous foraging parties which plundered and burned the countryside.[4][5] Sulla was unable to defend the region with his far smaller force and instead was forced to stay camped up on the hill.[4][5] Instead of remaining idle, Sulla ordered his men to dig entrenchments on the flanks to protect against possible envelopment by cavalry and also ordered the construction of palisades in the front to defend against the chariots.[13] The exercise was twofold in intention, first Sulla sought to ensure the discipline of his soldiers and second, he hoped to tire the soldiers out so that they were more willing to battle.[9][14] When his troops came to him requesting battle, Sulla challenged the men, citing that their new found will to fight was a response to inherent laziness to work, to occupy the hill of Parapotamii.[14] The men agreed to this task, Archelaus had already marked the position for his own men and it became a race between Archelaus' and Sulla's men to occupy the position first.[14] Baker describes this position as "almost impregnable", the occupier had no choice but to turn eastward towards Chaeronea to advance and if action took place here, one army or the other would be fighting at an angle.[14]

Sulla opened the engagement with an apparent retreat, leaving one unit under Gabinius to occupy and defend the town of Chaeronea and having Murena retreat back onto Mount Thurium, while he himself marched alongside the right bank of the river Cephisus.[11] Archelaus in response marched forth to occupy a position facing Chaeronea and extended a flanking force to occupy Murena's troops at Thurium.[11] Sulla linked up with Chaeronea and extended the Roman line across the valley.[11] Murena's position was the weakest, possibly untenable, so to strengthen it Gabinius recruited some of the locals to help deal with the danger, a proposition which Sulla approved.[11] By this point, Sulla had taken up his position on the right and the battle began.[15]

Murena, assisted by the force of natives from Chaeronea, cautiously launched an attack against the right flank, which, being attacked from above, was forced down the hill with disastrous consequences and possibly up to 3,000 casualties.[5][16] In exchange, the Pontic chariots charged forth against Gabinius in the centre, who withdrew his troops behind the defensive stakes he had prepared, which stymied the chariots.[16] The barrage of Roman javelins and arrows then brought down many of the chariots and caused the rest to retreat in panic. Many of the survivors crashed into the phalanx advancing behind them, leaving it vulnerable to attack.[13]

The Roman legions then came out of their entrenchment to face the Pontic phalanx of freed slaves, who were prevented from coming to a full charge by the field fortifications the Romans had in place.[17] The legionaries, indignant at having to fight against slaves instead of free men, fought with a terrible fury. They parried the enemy's long pikes with their short swords and shields and in some cases simply grappled them away with their bare hands.[17] In the end the barrage of stones and bolts from the Roman catapults so disordered the phalanx that the Roman swordsmen were able to infiltrate the hedge of pikes and rout it.[18]

In the meantime, Archelaus continued extending his line rightward to outflank Murena on the Roman left wing.[19][20] Hortensius, with the reserve cohorts under his command, came to Murena's rescue, but Archelaus, with 2,000 cavalry, promptly wheeled and pushed him back to the foothills, whence Hortensius's force stood isolated and in danger of being annihilated.[19][21] Seeing this, Sulla raced across the field with his cavalry from the Roman right which was not yet engaged, forcing Archelaus to withdraw.[19][21] The Pontic commander now took the opportunity to ride against the weakened Roman right, left vulnerable by Sulla's absence, and at the same time left Taxiles with the bronze-shields to continue the attack on Murena, who was now exposed due to the retreat of Hortensius.[19]

Sending Hortensius with 4 cohorts to reinforce Murena, Sulla quickly returned to the right with his cavalry, bringing also one cohort from Hortensius' force and another two from (presumably) the other reserve under Galba.[19] The Romans there were resisting well, and when Sulla arrived they broke through the Pontic line and pursued them towards the Cephissus river and Mount Akontion.[21][22] The centre began advancing forward being led by Gabinius who was slaughtering the enemy troops.[18] Seeing that Murena on the opposite wing was also successful, Sulla ordered a general advance. The entire Pontic army routed, and the commander Taxiles fell into Roman hands, while Archelaus escaped with what remained of his force to Chalcis.[21] It was said that only 10,000 Pontic soldiers were able to save themselves, and although this is probably an exaggeration, their losses were nonetheless substantial.[23] Sulla reported that 100,000 of Archelaus' troops were killed, that 14 of his own were missing at the end of the battle and that two of those made it back by the next day.[9] These figures are, however, called into question as being wholly unconvincing.[1][9] Despite the odds, however, the Romans had emerged victorious.[24]

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