How a winter snowstorm in 73 BC sealed the fate of a Pontic army.
During the Third Mithridatic War, a Roman force led by Lucius Licinius Lucullus executed a decisive strike against retreating troops near the Rhyndacus River. Caught in a blinding snowstorm, the Pontic soldiers faced a brutal defeat that ultimately forced Mithridates VI to abandon his siege at Cyzicus entirely.
The conflict arose when Mithridates VI besieged the Roman proconsul Marcus Aurelius Cotta at Cyzicus. Lucullus, originally stationed in Cilicia, abandoned his own planned southern invasion of Pontus to intercept the enemy. By trapping the Pontic army on the Cyzicus peninsula, Lucullus forced Mithridates into a desperate situation as winter approached and supplies dwindled.
Attempting to salvage his position, Mithridates ordered his cavalry, along with the sick and wounded, to retreat east into Bithynia under the command of Neoptolemus. Lucullus anticipated this move, positioning ten cohorts along the Rhyndacus River. Despite the harsh weather and the bravery of the Pontic defenders, the combined Roman forces—supported by an advance guard of cavalry and auxiliaries—overwhelmed them.
The scale of the Roman victory was significant. According to historical accounts by Plutarch and Appian, the Romans captured 15,000 men and 6,000 horses during the engagement. This defeat, compounded by famine and plague within the main Pontic camp, compelled Mithridates to flee by sea. Lucullus pursued the retreating army, inflicting further losses at the confluence of the Aesepus and Granicus Rivers.
This series of engagements marked a turning point in the Third Mithridatic War, demonstrating the effectiveness of Roman tactical maneuvering under Lucullus. By isolating the Pontic forces and exploiting their logistical failures during the winter, the Romans successfully dismantled the threat posed by Mithridates at Cyzicus, shifting the momentum of the campaign firmly in their favor.
Source: Battle of the Rhyndacus (73 BC)
