XXIX.  Now Surena was delighted at the Romans being besieged, and at daybreak he led the Parthians against the city, who, with many insulting expressions, bade the Romans, if they wished to have a truce, deliver up to them Crassus and Cassius[83] in chains.  The Romans were vexed at being deceived; and, telling Crassus to give up all hopes of aid from the Armenians as too remote and groundless, they prepared to make their escape by stealth; and none of the people of Carrhae were to know this before the time came.  But Andromachus, that most faithless wretch, heard of it from Crassus, who confided to him the secret, and also the guidance on the route.  Accordingly, all was known to the Parthians; for Andromachus reported to them every particular.  But as it is not the custom of the Parthians to fight in the dark, and indeed they cannot easily do it, and Crassus had left the city by night, Andromachus contrived that the Parthians should not be far behind in the pursuit, by leading the Romans first by one route and then by another, till at last he brought them out of their course into deep marshes and ground full of ditches, and thus made the march difficult and circuitous to all who followed him; for there were some who suspected that Andromachus had no honest object in turning and twisting about, and therefore did not follow.  Cassius, indeed, returned to Carrhae; and when the guides, who were Arabs, advised him to wait till the moon had passed the Scorpion, he replied, “I fear the Archer more than the Scorpion,” and, saying this, he rode off to Syria, with five hundred horsemen.  Others, who had faithful guides, got into a mountainous country, called Sinnaca,[84] and were in a safe position before daybreak:  they were about five thousand in number, and were commanded by a brave man, Octavius.  But daybreak found Crassus exposed to the treachery of Andromachus in the unfavourable ground and the marshes.  Crassus had with him four cohorts of the legionary soldiers, and a very few horsemen, and five lictors, with whom he got upon the road with great difficulty just as the enemy was falling upon him; and now being about twelve stadia short of joining Octavius, he fled to another hill not so difficult for cavalry nor yet so strong, but one that lay below Sinnaca, and was connected with it by a long ridge, which stretched through the middle of the plain.  His danger was apparent to Octavius, who ran before any one else with a few men, from the higher ground to aid Crassus, upon which the rest of the men, abusing themselves for cowards, rushed forward, and, falling on the enemy, and repulsing them from the hill, put Crassus in the midst of them, and threw their shields before him, proudly exclaiming that there was no Parthian missile which should strike the Imperator until all of them had fallen in defence of him.