Then they were put in separate divisions and sent into camp, Cassius on the boundary of Bithynia and Galatia, Maniusnote on Mithridates' line of march to Bithynia, and Oppius,note the third general, among the mountains of Cappadocia. Each of these had about 40,000 men, horse and foot together. They had also a fleet under command of Minucius Rufus and Gaius Popillius at
Byzantium, guarding the mouth of the Euxine. Nicomedes was present with 50,000 foot and 6,000 horse under his command. Such was the total strength of the forces brought together.
Mithridates had in his own army 250,000 foot and 40,000 horse, 300 ships with decks, 100 with two banks of oars each, and other apparatus in proportion. He had for generals Neoptolemus and Archelaus, two brothers. The king took charge of the greater number in person. Of the allied forces Arcathias, the son of Mithridates, led 10,000 horse from
Armenia Minor, and Doryalus commanded the
phalanx. Craterus had charge of 130 war chariots. So great were the preparations on either side when the Romans and Mithridates first came in conflict with each other, about the 173d Olympiad.
[18] When Nicomedes and the generals of Mithridates came in sight of each other in a wide plain bordered by the river Amnias, they drew up their forces for battle. Nicomedes had his entire army in hand; Neoptolemus and Archelaus had only their light infantry and the cavalry of Arcathias and a few chariots; for the phalanx had not yet come up.
They sent forward a small force to seize a rocky hill in the plain lest they should be surrounded by the Bithynians, who were much more numerous. When Neoptolemus saw his men driven from the hill he was still more in fear of being surrounded. He advanced with haste to their assistance, at the same time calling on Arcathias for help.
When Nicomedes perceived the movement, he sought to meet it by a similar one. Thereupon a severe and bloody struggle ensued. Nicomedes prevailed and put the Mithridateans to flight until Archelaus, advancing from the right flank, fell upon the pursuers, who were compelled to turn their attention to him. He yielded little by little in order that the forces of Neoptolemus might have a chance to rally. When he judged that they had done so sufficiently, he advanced again. At the same time the scythe-bearing chariots made a charge on the Bithynians, cutting some of them in two, and tearing others to pieces.
The army of Nicomedes was terrified at seeing men cut in halves and still breathing, or mangled in fragments and their parts hanging on the scythes. Overcome rather by the hideousness of the spectacle than by loss of the fight, fear took possession of their ranks. While they were thus thrown into confusion, Archelaus attacked them in front, and Neoptolemus and Arcathias, who had turned about, assailed them in the rear.
They fought a long time facing both ways. After the greater part of his men had fallen, Nicomedes fled with the remainder into Paphlagonia, although the Mithridatean phalanx had not come into the engagement at all. His camp was captured, together with a large sum of money and many prisoners. All these Mithridates treated kindly and sent to their homes with supplies for the journey, thus gaining a reputation for clemency among his enemies.