He had taken up a strong position with the river Corma in his front, and, remaining on the defensive, contented himself with trying by his emissaries the fidelity of his rival's troops and allies.
The plan succeeded.

After a little time, the army of Meherdates began to melt away.

Izates of Adiabene and Abgarus of Edessa drew off their contingents, and left the pretender to depend wholly on his Parthian supporters.

Even their fidelity was doubtful, and might have given way on further trial; Meherdates therefore resolved, before being wholly deserted, to try the chance of a battle.
His adversary was now as willing to engage as himself, since he felt that he was no longer outnumbered.

The rivals met, and a fierce and bloody action was fought between the two armies, no important advantage being for a long time gained by either.