How a simple night raid ended the Third Mithridatic War in 66 BC
When Pompey the Great marched into the Lycus valley, he faced a king who had burned crops and used superior cavalry to stall the Roman advance. But a single chaotic skirmish at a mountain camp turned the tide, trapping an army and forcing a desperate, final flight for survival.
By 67 BC, Mithridates VI of Pontus had regained his kingdom following the Battle of Zela, taking advantage of Roman political infighting. Pompey, Rome's premier commander, responded with a strategic masterclass. He blockaded the Asia Minor coastline, secured Cappadocia with three legions, and pressured Phraates III of Parthia to invade Armenia. This forced Tigranes II, Mithridates' primary ally, to abandon the Pontic king to defend his own borders. With his support network dismantled, Mithridates retreated into the mountainous heart of his territory, attempting to starve the Roman forces by destroying local supplies.
The decisive confrontation occurred in the Lycus valley, where Mithridates encamped on a hill named Dasteira. An initial clash in a defile between vanguards spiraled into a rout when Pontic cavalry, having dismounted to fight, panicked their own ranks while retreating to retrieve their horses. Sensing a critical opening, Pompey launched a daring night assault. By positioning his troops with the moon at their backs, the Romans forced the Pontic archers to fire prematurely, allowing the legionaries to breach the camp's defenses. Once inside, the superior close-quarters combat skills of the Roman infantry turned the engagement into a slaughter.
Mithridates managed to escape with 800 horsemen, but at least 10,000 of his soldiers were killed in the trap. With Armenia closed to him and a 100-talent bounty placed on his head by a suspicious Tigranes, the king fled north to the Bosporan Kingdom. He murdered his son, Machares, to seize the throne, but his reign was short-lived. In 63 BC, after his own army rebelled in favor of his son Pharnaces, Mithridates attempted suicide by poison. When the poison failed, he was killed by his own Gallic bodyguard, finally concluding the Third Mithridatic War.
The battle remains a testament to Pompey's tactical flexibility and the fragility of ancient coalitions. By isolating Mithridates from his allies and exploiting the psychological collapse of the Pontic rearguard, Pompey effectively dismantled a regional power with minimal Roman losses. The aftermath solidified Roman dominance in the East, leaving the once-mighty king a fugitive in his own northern territories.
Source: Battle of the Lycus
