Plato, Laws 699a

ἀφίστασθαι τῆς ὁρμῆς. οἱ δὲ Ἀθηναῖοι πᾶν τοῦτο ᾤοντο ἐπὶ σφᾶς αὐτοὺς παρασκευάζεσθαι διὰ τὸ Μαραθῶνι γενόμενον, καὶ ἀκούοντες Ἄθων τε διορυττόμενον καὶ Ἑλλήσποντον ζευγνύμενον καὶ τὸ τῶν νεῶν πλῆθος, ἡγήσαντο οὔτε κατὰ γῆν σφίσιν εἶναι σωτηρίαν οὔτε κατὰ θάλατταν· οὔτε γὰρ βοηθήσειν αὑτοῖς οὐδένα—μεμνημένοι ὡς οὐδʼ ὅτε τὸ πρότερον ἦλθον καὶ τὰ περὶ Ἐρέτριαν διεπράξαντο, σφίσι γε οὐδεὶς τότε ἐβοήθησεν οὐδʼ ἐκινδύνευσεν συμμαχόμενος· ταὐτὸν

The Athenians imagined that all these preparations were aimed against them because of the affair at Marathon; and when they heard of how the canal had been made through Athos, and the bridge thrown over the Hellespont, and were told of the vast number of vessels in the Persian flotilla, then they felt that there was no salvation for them by land, nor yet by sea. By land they had no hopes that anyone would come to their aid; for they remembered how, on the first arrival of the Persians and their subjugation of Eretria, nobody helped them or