[308] Herodot. ix, 7. Οἱ γὰρ δὴ Λακεδαιμόνιοι ὅρταζόν τε τοῦτον τὸν χρόνον καί σφι ἦν Ὑακίνθια· περὶ πλείστου δ’ ἦγον τὰ τοῦ θεοῦ πορσύνειν· ἅμα δὲ τὸ τεῖχός σφι τὸ ἐν τῷ Ἰσθμῷ ἐτείχεον, καὶ ἤδη ἐπάλξεις ἐλάμβανε. Nearly a century after this, we are told that it was always the practice for the Amyklæan hoplites to go home for the celebration of the Hyakinthia, on whatever expedition they might happen to be employed (Xenoph. Hellen. iv, 5, 11). Meanwhile, Mardonius, informed of the unfavorable reception which his proposals had received at Athens, put his army in motion forthwith from Thessaly, joined by all his Grecian auxiliaries, and by fresh troops from Thrace and Macedonia. As he marched through Bœotia, the Thebans, who heartily espoused his cause, endeavored to dissuade him from farther military operations against the united force of his enemies,—urging him to try the efficacy of bribes, presented to the leading men in the different cities, for the purpose of disuniting them. But Mardonius, eager to repossess himself of Attica, heeded not their advice: about ten months after the retreat of Xerxes, he entered the country without resistance, and again established the Persian head-quarters in Athens, May or June, 479 B. C.[309] [309] Diodor. xi, 28; Herodot. ix, 2, 3, 17. οἱ μὲν ἄλλοι πάντες παρεῖχον στρατιὴν καὶ συνεσέβαλον ἐς Ἀθήνας ὅσοι περ ἐμήδιζον Ἑλλήνων τῶν ταύτῃ οἰκημένων, etc. Before he arrived, the Athenians had again removed to Salamis, under feelings of bitter disappointment and indignation. They had in vain awaited the fulfilment of the Spartan promise, that a Peloponnesian army should join them in Bœotia for the defence of their frontier; at length, being unable to make head against the enemy alone, they found themselves compelled to transport their families across to Salamis.[310] The migration was far less terrible than that of the preceding summer, since Mardonius had no fleet to harass them; but it was more gratuitous, and might have been obviated had the Spartans executed their covenant, which would have brought about the battle of Platæa two months earlier than it actually was fought. [310] Herodot. ix, 4.