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. CHAPTER XX. MARCH THROUGH THE CASPIAN GATES.