History of the Peloponnesian War

Now Demosthenes, the Athenian, (for after what had happened in Aetolia, he was still in the neighbourhood of Naupactus) having previous notice of the armament, and being alarmed for the town, went and persuaded the Acarnanians (though with difficulty, on account of his retreat from Leucas) to go to the relief of Naupactus.

Accordingly they sent with him on board his ships a thousand heavy-armed, who threw themselves into the place and saved it. For the walls being extensive, and the garrison small, there was reason to fear that they might not hold out.