The Parthians, taken by surprise, offered no resistance, and the rich and flourishing Greek colonies on the Euphrates and Tigris, who detested the Parthian yoke, received Crassus as a liberator. The town of Nicephorium (_Rakkah_), situated near Ichnæ, on the Balissus, opened its gates to him; Zenodotium alone stood a siege. Instead of taking advantage of the concurrence of circumstances, and advancing promptly upon the Tigris, carrying the considerable town of Seleucia, Ctesiphon,[724] the ordinary residence of the King of the Parthians, and even Babylon, he confined himself to plundering the province. Having left 7,000 infantry and 1,000 cavalry in garrison in a few fortresses, he returned to Syria to take his winter quarters. There, without occupying himself with the next campaign, he only thought of committing exactions and of pillaging the temples of Hierapolis and Jerusalem. At the commencement of 701, Crassus took the field again with seven legions, nearly 4,000 cavalry, and the same number of light-armed infantry,[725] and re-entered Mesopotamia. He had for lieutenants his son Publius, celebrated for his courage, his elevated sentiments, and his conduct in Gaul; the brave Octavius, who afterwards perished rather than abandon his general; Vargunteius, Censorinus, and Petronius: for quæstor, C. Cassius Longinus, esteemed for his valour and prudence, and who was, ten years afterwards, one of the murderers of Cæsar. An Arab had become his auxiliary; it was the chief of the Osroenes, Bedouins of the desert, who had formerly served Pompey in his campaign against Mithridates; he was named Abgaros, or Abgar,[726] and had been bribed by the King of the Parthians to betray Crassus.