Passage 10.22.1
ἑβδόμῃ δὲ ὕστερον μετὰ τὴν μάχην λόχος τῶν Γαλατῶν ἀνελθεῖν ἐς τὴν Οἴτην ἐπεχείρησε κατὰ Ἡράκλειαν· ἀτραπὸς δὲ στενὴ καὶ ταύτῃ μετὰ ταῦτα τὰ ἐρείπια ἀνήκει τὰ Τραχῖνος· ἦν δὲ καὶ ἱερὸν Ἀθηνᾶς τότε ὑπὲρ τῆς πόλεως Τραχινίδος καὶ ἀναθήματα ἐν αὐτῷ. ἔς τε οὖν τὴν Οἴτην ἀναβήσεσθαι κατὰ τὴν ἀτραπὸν ἤλπιζον καὶ ἅμα προσέσεσθαί σφισιν ἐν παρέργῳ τὰ ἐκ τοῦ ἱεροῦ τὴν φρουρὰν οἰομένου Τελεσάρχῳ. καὶ νικῶσι μὲν τοὺς βαρβάρους τῇ μάχῃ, αὐτὸς δὲ ἔπεσεν ὁ Τελέσαρχος, ἀνήρ εἴπερ τις καὶ ἄλλος πρόθυμος ἐς τὰ Ἑλλήνων.
Seven days after the battle, a band of Galatians attempted to ascend Mount Oeta by way of Heraclea. There is a narrow pathway there, running upwards past the ruins of Trachis. At that time, there stood above the city of Trachis a sanctuary of Athena, where offerings had been dedicated. The Galatians hoped both to ascend Mount Oeta using this pathway and, as a secondary goal, to seize the valuables from the sanctuary, believing that its guard under Telesarchus would be easily overcome. The Greeks prevailed over the barbarians in the ensuing combat, but Telesarchus himself fell, a man—if ever there was one—exceptionally devoted to the cause of Greece.