§7.206.1τούτους μὲν τοὺς ἀμφὶ Λεωνίδην πρώτους ἀπέπεμψαν Σπαρτιῆται, ἵνα τούτους ὁρῶντες οἱ ἄλλοι σύμμαχοι στρατεύωνται μηδὲ καὶ οὗτοι μηδίσωσι, ἢν αὐτοὺς πυνθάνωνται ὑπερβαλλομένους·
The Spartans sent these men under Leonidas first, so that the other allies, seeing them, might take the field, and might not themselves also medize if they should learn that they (the Spartans) were delaying.
μετὰ δέ, Κάρνεια γάρ σφι ἦν ἐμποδών, ἔμελλον ὁρτάσαντες καὶ φυλακὰς λιπόντες ἐν τῇ Σπάρτῃ κατὰ τάχος βοηθέειν πανδημεί.
After this, however, for the Carneia was in their way, they intended, once they had celebrated the festival and left guards in Sparta, to bring help quickly with their entire force.
§7.206.2ὣς δὲ καὶ οἱ λοιποὶ τῶν συμμάχων ἐνένωντο καὶ αὐτοὶ ἕτερα τοιαῦτα ποιήσειν· ἦν γὰρ κατὰ τὠυτὸ Ὀλυμπιὰς τούτοισι τοῖσι πρήγμασι συμπεσοῦσα· οὔκων δοκέοντες κατὰ τάχος οὕτω διακριθήσεσθαι τὸν ἐν Θερμοπύλῃσι πόλεμον ἔπεμπον τοὺς προδρόμους.
And in like manner the rest of the allies also had intended themselves to do other such things; for the Olympic festival happened to coincide with these events at the very same time; thinking therefore that the war at Thermopylae would not be decided so quickly, they sent their advance guards.