Roman general Lucius Licinius Murena became very overconfident while campaigning against Pontus and ignored orders to cease operations there.
At Halys River, the Romans spared a small Pontic army under general Gordius for too long.
Gordius waited until King Mithradates VI arrived himself with the main Pontic army.
The combined Pontic army attacked the Roman forces on the opposite side of the river.
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