Crassus

And most of all, Artabazes the king of Armenia gave him courage, for he came to his camp with six thousand horsemen. These were said to be the king’s guards and couriers; but he promised ten thousand mail-clad horsemen besides, and thirty thousand footmen, to be maintained at his own cost.

And he tried to persuade Crassus to invade Parthia by way of Armenia, for thus he would not only lead his forces along in the midst of plenty, which the king himself would provide, but would also proceed with safety, confronting the cavalry of the Parthians, in which lay their sole strength, with many mountains, and continuous crests, and regions where the horse could not well serve. Crassus was tolerably well pleased with the king’s zeal and with the splendid reinforcements which he offered, but said he should march through Mesopotamia, where he had left many brave Romans.