οἱ δʼ ἀμφὶ Ξέρξην ἐπισχόντες ὀλίγας ἡμέρας μετὰ τὴν ναυμαχίην ἐξήλαυνον ἐς Βοιωτοὺς τὴν αὐτὴν ὁδόν. ἔδοξε γὰρ Μαρδονίῳ ἅμα μὲν προπέμψαι βασιλέα, ἅμα δὲ ἀνωρίη εἶναι τοῦ ἔτεος πολεμέειν, χειμερίσαι τε ἄμεινον εἶναι ἐν Θεσσαλίῃ, καὶ ἔπειτα ἅμα τῷ ἔαρι πειρᾶσθαι τῆς Πελοποννήσου.
ὡς δὲ ἀπίκατο ἐς τὴν Θεσσαλίην, ἐνθαῦτα Μαρδόνιος ἐξελέγετο πρώτους μὲν τοὺς Πέρσας πάντας τοὺς ἀθανάτους καλεομένους, πλὴν Ὑδάρνεος τοῦ στρατηγοῦ (οὗτος γὰρ οὐκ ἔφη λείψεσθαι βασιλέος), μετὰ δὲ τῶν ἄλλων Περσέων τοὺς θωρηκοφόρους καὶ τὴν ἵππον τὴν χιλίην, καὶ Μήδους τε καὶ Σάκας καὶ Βακτρίους τε καὶ Ἰνδούς, καὶ τὸν πεζὸν καὶ τὴν ἄλλην ἵππον.
ταῦτα μὲν ἔθνεα ὅλα εἵλετο, ἐκ δὲ τῶν ἄλλων συμμάχων ἐξελέγετο κατʼ ὀλίγους, τοῖσι εἴδεά τε ὑπῆρχε διαλέγων καὶ εἰ τεοῖσι τι χρηστὸν συνῄδεε πεποιημένον· ἓν δὲ πλεῖστον ἔθνος Πέρσας αἱρέετο, ἄνδρας στρεπτοφόρους τε καὶ ψελιοφόρους, ἐπὶ δὲ Μήδους· οὗτοι δὲ τὸ πλῆθος μὲν οὐκ ἐλάσσονες ἦσαν τῶν Περσέων, ῥώμῃ δὲ ἥσσονες. ὥστε σύμπαντας τριήκοντα μυριάδας γενέσθαι σὺν ἱππεῦσι.
Xerxes meanwhile with his army stayed for a few days after the sea-fight, and then they all began to march forth towards Boeotia by the same way by which they had come: for Mardonios thought both that it was well for him to escort the king on his way, and also that it was now too late in the year to carry on the war; it was better, he thought, to winter in Thessaly and then at the beginning of spring to attempt the Peloponnese. When he came to Thessaly, then Mardonios chose out for himself first all those Persians who are called “Immortals,” except only their commander Hydarnes (for Hydarnes said that he would not be left behind by the king), and after them of the other Persians those who wore cuirasses, and the body of a thousand horse: also the Medes, Sacans, Bactrians and Indians, foot and horsemen both. These nations he chose in the mass, but from the other allies he selected by few at a time, choosing whose who had fine appearance of those of whom he knew that they had done good service. From the Persians he chose more than from any other single nation, and these wore collars of twisted metal and bracelets; and after them came the Medes, who in fact were not inferior in number to the Persians, but only in bodily strength. The result was that there were thirty myriads in all, including cavalry.
ἐν δὲ τούτῳ τῷ χρόνῳ, ἐν τῷ Μαρδόνιός τε τὴν στρατιὴν διέκρινε καὶ Ξέρξης ἦν περὶ Θεσσαλίην, χρηστήριον ἐληλύθεε ἐκ Δελφῶν Λακεδαιμονίοισι, Ξέρξην αἰτέειν δίκας τοῦ Λεωνίδεω φόνου καὶ τὸ διδόμενον ἐξ ἐκείνου δέκεσθαι. πέμπουσι δὴ κήρυκα τὴν ταχίστην Σπαρτιῆται, ὃς ἐπειδὴ κατέλαβε ἐοῦσαν ἔτι πᾶσαν τὴν στρατιὴν ἐν Θεσσαλίῃ, ἐλθὼν ἐς ὄψιν τὴν Ξέρξεω ἔλεγε τάδε.
ὦ βασιλεῦ Μήδων, Λακεδαιμόνιοί τέ σε καὶ Ἡρακλεῖδαι οἱ ἀπὸ Σπάρτης αἰτέουσι φόνου δίκας, ὅτι σφέων τὸν βασιλέα ἀπέκτεινας ῥυόμενον τὴν Ἑλλάδα. ὁ δὲ γελάσας τε καὶ κατασχὼν πολλὸν χρόνον, ὥς οἱ ἐτύγχανε παρεστεὼς Μαρδόνιος, δεικνὺς ἐς τοῦτον εἶπε τοιγὰρ σφι Μαρδόνιος ὅδε δίκας δώσει τοιαύτας οἵας ἐκείνοισι πρέπει.
During this time, while Mardonios was selecting his army and Xerxes was in Thessaly, there had come an oracle from Delphi to the Lacedemonians, bidding them ask satisfaction from Xerxes for the murder of Leonidas and accept that which should be given by him. The Spartans therefore sent a herald as quickly as possible, who having found the whole army still in Thessaly came into the presence of Xerxes and spoke these words: “O king of the Medes, the Lacedemonians and the sons of Heracles of Sparta demand of thee satisfaction for murder, because thou didst kill their king, fighting in defence of Hellas.” He laughed and then kept silence some time, and after that pointing to Mardonios, who happened to be standing by him, he said: “Then Mardonios here shall give them satisfaction, such as is fitting for them to have.”