Passage 10.20.3
ἐπὶ δὲ τοὺς ἀπὸ τοῦ Ὠκεανοῦ βαρβάρους τοσοίδε ἐς Θερμοπύλας ἀφίκοντο Ἕλληνες· ὁπλῖται μύριοι καὶ ἵππος πεντακοσία παρὰ Βοιωτῶν· ἐβοιωτάρχουν δὲ Κηφισόδοτος καὶ Θεαρίδας καὶ Διογένης καὶ Λύσανδρος. ἐκ δὲ Φωκέων ἱππεῖς πεντακόσιοι καὶ ἐς τρισχιλίους ὁ ἀριθμὸς τῶν πεζῶν· στρατηγοὶ δὲ Φωκέων Κριτόβουλός τε ἦν καὶ Ἀντίοχος.
The following number of Greeks arrived at Thermopylae to oppose the barbarians from the Ocean: ten thousand heavy infantry and five hundred cavalry from the Boeotians. The Boeotarchs in command were Cephisodotus, Thearidas, Diogenes, and Lysander. From the Phocians came five hundred cavalrymen and infantry numbering nearly three thousand. The generals of the Phocians were Critobulus and Antiochus.