Passage 4.25.1
ἐπεὶ δὲ ἔσχον τὴν Ναύπακτον, οὐκ ἀπέχρη πόλιν τε αὐτοῖς καὶ χώραν εἰληφέναι παρὰ Ἀθηναίων, ἀλλὰ σφᾶς πόθος εἶχεν ἰσχυρὸς χερσὶ ταῖς αὑτῶν φανῆναι λόγου τι κεκτημένους ἄξιον. καὶ ἠπίσταντο γὰρ Οἰνιάδας Ἀκαρνάνων γῆν τε ἔχοντας ἀγαθὴν καὶ Ἀθηναίοις διαφόρους τὸν πάντα ὄντας χρόνον, στρατεύουσιν ἐπʼ αὐτούς. ὄντες δὲ ἀριθμῷ μὲν οὐ πλείους, ἀρετῇ δὲ καὶ πολὺ ἀμείνονες ὄντες τῇ σφετέρᾳ νικῶσι, καὶ ἐπολιόρκουν κατακεκλειμένους ἐς τὸ τεῖχος.
But after they had taken Naupactus, it was not sufficient for them merely to have gained a city and territory from the Athenians; rather, a powerful desire drove them to prove by their own strength that they possessed something worthy of reputation. Knowing also that the Oeniadae held good land in Acarnania and were continually hostile to the Athenians, they undertook an expedition against them. Though not superior in numbers, they were far superior in valor and skill, and thus won a victory by their own prowess, subsequently laying siege to their enemies who had shut themselves within the walls.