Through such combination of profuse allurement, corruption, and violence, the tide began to turn again in favor of the Phokians. Onomarchus found himself shortly at the head of a formidable army, which he marched forth from Delphi, and subdued successively the Lokrians of Amphissa, the Epiknemidian Lokrians, and the neighboring territory of Doris. He carried his conquests even as far as the vicinity of Thermopylæ; capturing Thronium, one of the towns which commanded that important pass, and reducing its inhabitants to slavery. It is probable that he also took Nikæa and Alpônus—two other valuable positions near Thermopylæ, which we know to have been in the power of the Phokians until the moment immediately preceding their ruin—since we find him henceforward master of Thermopylæ, and speedily opening his communications with Thessaly.[538] Besides this extension of dominion to the north and east of Phokis, Onomarchus also invaded Bœotia. The Thebans, now deprived of their northern allies, did not at first meet him in the field, so that he was enabled to capture Orchomenus. But when he proceeded to attack Chæroneia, they made an effective effort to relieve the place. They brought out their forces, and defeated him, in an action not very decisive, yet sufficient to constrain him to retire into Phokis. [538] Diodor. xvi. 33. His account of the operations of Onomarchus is, as usual, very meagre—εἰς δὲ τὴν πολεμίαν ἐμβαλὼν, Θρόνιον μὲν ἐκπολιορκήσας ἐξηνδραποδίσατο, Ἀμφισσεῖς δὲ καταπληξάμενος, τὰς δ᾽ ἐν Δωριεῦσι πόλεις πορθήσας, τὴν χώραν αὐτῶν ἐδῄωσεν. That Thronium, with Alpônus and Nikæa, were the three places which commanded the pass of Thermopylæ—and that all the three were in possession of the Phokians immediately before they were conquered by Philip of Macedon in 346 B. C.—we know from Æschines, Fals. Leg. p. 286. c. 41. ... πρέσβεις πρὸς ὑμᾶς (the Athenians) ἦλθον ἐκ Φωκέων, βοηθεῖν αὑτοῖς κελεύοντες, καὶ ἐπαγγελλόμενοι παραδώσειν Ἀλπωνὸν καὶ Θρόνιον καὶ Νίκαιαν, τὰ τῶν παρόδων τῶν εἰς Πύλας χωρία κύρια. In order to conquer Thronium, Onomarchus must have marched through and mastered the Epiknemidian Lokrians; and though no place except Thronium is specified by Diodorus, it seems plain that Onomarchus can not have conquered Thronium alone.