When Alexander reached Ecbatana, he sent the Thessalian cavalry and the other Grecian allies back to the sea, paying them the full hire which had been stipulated, and making them an additional donation from himself of 2,000 talents. He issued an order that if any man of his own accord wished still to continue to serve for hire with him, he should enlist; and those who enlisted in his service were not a few. He then ordered Epocillus, son of Polyeides, to conduct the rest down to the sea, taking other cavalry as a guard for them, since the Thessalians sold their horses there. He also sent word to Menes to take upon himself the duty of seeing that they were conveyed in triremes to Euboea, when they arrived at the sea.[458] He instructed Parmenio to deposit the money which was being conveyed from Persis in the citadel at Ecbatana, and to hand it over to the charge of Harpalus;[459] for he had left this man over the money with a guard of 6,000 Macedonians and a few horsemen and light-armed infantry to take care of it. He told Parmenio himself to take the Grecian mercenaries, the Thracians, and all the other horsemen except the Companion cavalry, and march by the land of the Cadusians into Hyrcania. He also sent word to Clitus, the commander of the royal squadron of cavalry, who had been left behind at Susa ill, that when he arrived at Ecbatana from Susa he should take the Macedonians who had been left there in charge of the money, and go in the direction of Parthia, where also he himself intended soon to arrive.
Then taking the Companion cavalry, the light cavalry used for skirmishing, the Greek mercenary cavalry, under the command of Erigyius, the Macedonian phalanx, except the men who had been placed in charge of the money, the archers, and the Agrianians, he marched against Darius. In the forced march which he made, many of his soldiers were left behind, worn out with fatigue, and many of the horses died. He nevertheless pressed on, and on the eleventh day arrived at Rhagae.[460] This place is distant from the Caspian Gates one day’s journey to one marching as Alexander did. But Darius had already passed through this defile before Alexander came up, though many of those who were his companions in flight deserted him on the way and retired to their own abodes. Many also surrendered to Alexander. The latter now gave up the hope of capturing Darius by close pursuit, and remained there five days to give his troops repose. He appointed Oxodates a Persian, who had the ill fortune to be arrested by Darius and shut up at Susa, to the office of viceroy of Media; for this treatment was an inducement to Alexander to rely on his fidelity. He then marched towards Parthia; and on the first day encamped near the Caspian Gates, which he passed through on the second day as far as the country was inhabited.[461] Hearing that the country further on was desert, he resolved to procure a stock of provisions from the place where he was encamped, and accordingly sent Coenus out on a foraging expedition with the cavalry and a small body of infantry.