Surena, therefore, perceiving his soldiers less inclined to expose themselves, and knowing that if the Romans should prolong the battle till night, they might then gain the mountains and be out of his reach, betook himself to his usual craft. Some of the prisoners were set free, who had, as it was contrived, been in hearing, while some of the barbarians spoke a set purpose in the camp to the effect that the king did not design the war to be pursued to extremity against the Romans, but rather desired, by his general treatment of Crassus, to make a step towards reconciliation. And the barbarians desisted from fighting, and Surena himself, with his chief officers, riding gently to the hill, unbent his bow and held out his hand, inviting Crassus to an agreement, and saying that it was beside the king's intentions, that they had thus had experience of the courage and the strength of his soldiers; that now he desired no other contention but that of kindness and friendship, by making a truce, and permitting them to go away in safety. These words of Surena the rest received joyfully, and were eager to accept the offer, but Crassus, who had sufficient experience of their perfidiousness, and was unable to see any reason for the sudden change, would give no ear to them, and only took time to consider. But the soldiers cried out and advised him to treat, and then went on to upbraid and affront him, saying that it was very unreasonable that he should bring them to fight with such men armed, whom himself, without their arms, durst not look in the face. He tried first to prevail with them by entreaties, and told them that if they would have patience till evening, they might get into the mountains and passes, inaccessible for horse, and be out of danger, and withal he pointed out the way with his hand, entreating them not to abandon their preservation, now close before them. But when they mutinied and clashed their targets in a threatening manner, he was overpowered and forced to go, and only turning about at parting, said, "You, Octavius and Petronius, and the rest of the officers who are present, see the necessity of going which I lie under, and cannot but be sensible of the indignities and violence offered to me. Tell all men when you have escaped, that Crassus perished rather by the subtlety of his enemies, than by the disobedience of his countrymen."Octavius, however, would not stay there, but with Petronius went down from the hill; as for the lictors, Crassus bade them be gone. The first that met him were two half-blood Greeks, who, leaping from their horses, made a profound reverence to Crassus, and desired him, in Greek, to send some before him, who might see that Surena himself was coming towards them, his retinue disarmed, and not having so much as their wearing swords along with them. But Crassus answered, that if he had the least concern for his life, he would never have intrusted himself in their hands, but sent two brothers of the name of Roscius to inquire on what terms and in what numbers they should meet.
These Surena ordered immediately to be seized, and himself with his principal officers came up on horseback, and greeting him, said, "How is this, then? A Roman commander is on foot, whilst I and my train are mounted." But Crassus replied, that there was no error committed on either side, for they both met according to the custom of their own country. Surena told him that from that time there was a league between the king his master and the Romans, but that Crassus must go with him to the river to sign it, "for you Romans," said he, "have not good memories for conditions," and so saying, reached out his hand to him. Crassus, therefore, gave order that one of his horses should be brought; but Surena told him there was no need, "the king, my master, presents you with this;" and immediately a horse with a golden bit was brought up to him, and himself was forcibly put into the saddle by the grooms, who ran by the side and struck the horse to make the more haste. But Octavius running up, got hold of the bridle, and soon after one of the officers, Petronius, and the rest of the company came up, striving to stop the horse, and pulling back those who on both sides of him forced Crassus forward. Thus from pulling and thrusting one another, they came to a tumult, and soon after to blows. Octavius, drawing his sword, killed a groom of one of the barbarians, and one of them, getting behind Octavius, killed him. Petronius was not armed, but being struck on the breastplate, fell down from his horse, though without hurt. Crassus was killed by a Parthian, called Pomaxathres; others say by a different man, and that Pomaxathres only cut off his head and right hand after he had fallen. But this is conjecture rather than certain knowledge, for those that were by had not leisure to observe particulars, and were either killed fighting about Crassus, or ran off at once to get to their comrades on the hill. But the Parthians coming up to them, and saying that Crassus had the punishment he justly deserved, and that Surena bade the rest come down from the hill without fear, some of them came down and surrendered themselves, others were scattered up and down in the night, a very few of whom got safe home, and others the Arabians, beating through the country, hunted down and put to death. It is generally said, that in all twenty thousand men were slain and ten thousand taken prisoners.