§1.66.1τοῖς δ’ Ἀθηναίοις καὶ Πελοποννησίοις αἰτίαι μὲν αὗται προυγεγένηντο ἐς ἀλλήλους, τοῖς μὲν Κορινθίοις ὅτι τὴν Ποτείδαιαν ἑαυτῶν οὖσαν ἀποικίαν καὶ ἄνδρας Κορινθίων τε καὶ Πελοποννησίων ἐν αὐτῇ ὄντας ἐπολιόρκουν, τοῖς δὲ Ἀθηναίοις ἐς τοὺς Πελοποννησίους ὅτι ἑαυτῶν τε πόλιν ξυμμαχίδα καὶ φόρου ὑποτελῆ ἀπέστησαν, καὶ ἐλθόντες σφίσιν ἀπὸ τοῦ προφανοῦς ἐμάχοντο μετὰ Ποτειδεατῶν.
These, then, were the grounds of complaint that had already arisen between the Athenians and the Peloponnesians against one another: on the part of the Corinthians, because the Athenians were besieging Potidaea, which was their own colony and contained Corinthian and Peloponnesian men within it; and on the part of the Athenians against the Peloponnesians, because they had instigated the revolt of a city that was their ally and tributary, and had come openly to fight against them alongside the Potidaeans.
οὐ μέντοι ὅ γε πόλεμός πω ξυνερρώγει, ἀλλ’ ἔτι ἀνοκωχὴ ἦν· ἰδίᾳ γὰρ ταῦτα οἱ Κορίνθιοι ἔπραξαν.
Nevertheless, the war had not yet actually broken out, but there was still a suspension of hostilities; for the Corinthians had taken these actions on their own private account.