The Battle of the River Amnias was fought in 89 BC between Mithradates VI of Pontus and Nicomedes IV of Bithynia during the First Mithridatic War.

This battle and subsequent events would lead to the loss of Roman rule in the province of Asia for some years.

Neoptolemus and Archelaus, commanding the advance forces of Mithridates, sent troops forward to occupy the hill, but they were repelled by Nicomedes.

[2] The turning point of the battle occurred when the Scythed chariots led by Archelaus dived into Nicomedes army.

Even though Archelaus and Neoptolemus now had the clear advantage, the battle did not end until Nicomedes had lost most of his army.