Meanwhile Lucullus had possessed himself of a very strong position in rear of the Pontic army, which, although not permitting him directly to relieve the hard-pressed city, gave him the means of cutting off all supplies by land from the enemy.  Thus the enormous army of Mithradates, estimated with the camp-followers at 300,000 persons, was not in a position either to fight or to march, firmly wedged in between the impregnable city and the immoveable Roman army, and dependent for all its supplies solely on the sea, which fortunately for the Pontic troops was exclusively commanded by their fleet.  But the bad season set in; a storm destroyed a great part of the siege-works; the scarcity of provisions and above all of fodder for the horses began to become intolerable.  The beasts of burden and the baggage were sent off under convoy of the greater portion of the Pontic cavalry, with orders to steal away or break through at any cost; but at the river Rhyndacus, to the east of Cyzicus, Lucullus overtook them and cut to pieces the whole body.  Another division of cavalry under Metrophanes and Lucius Fannius was obliged, after wandering long in the west of Asia Minor, to return to the camp before Cyzicus.  Famine and disease made fearful ravages in the Pontic ranks.  When spring came on (681), the besieged redoubled their exertions and took the trenches constructed on Dindymon:  nothing remained for the king but to raise the siege and with the aid of his fleet to save what he could.  He went in person with the fleet to the Hellespont, but suffered considerable loss partly at its departure, partly through storms on the voyage.  The land army under Hermaeus and Marius likewise set out thither, with the view of embarking at Lampsacus under the protection of its walls.  They left behind their baggage as well as the sick and wounded, who were all put to death by the exasperated Cyzicenes.  Lucullus inflicted on them very considerable loss by the way at the passage of the rivers Aesepus and Granicus; but they attained their object.  The Pontic ships carried off the remains of the great army and the citizens of Lampsacus themselves beyond the reach of the Romans.

Maritime War
Mithradates Driven Back to Pontus

The consistent and discreet conduct of the war by Lucullus had not only repaired the errors of his colleague, but had also destroyed without a pitched battle the flower of the enemy’s army—­ it was said 200,000 soldiers.  Had he still possessed the fleet which was burnt in the harbour of Chalcedon, he would have annihilated the whole army of his opponent.  As it was, the work of destruction continued incomplete; and while he was obliged to remain passive, the Pontic fleet notwithstanding the disaster of Cyzicus took its station in the Propontis, Perinthus and Byzantium were blockaded by it on the European coast and Priapus pillaged on the Asiatic, and the headquarters of the king were established in the Bithynian port of Nicomedia.