History of the Peloponnesian War

Now Hippocrates himself, with a force raised at home, was ready, when the time came, to take the field against the Boeotians; but Demosthenes he sent on before, with the forty ships mentioned, to Naupactus; that after raising in those quarters an army of Acamanians and the other allies, he might sail to Siphae, in expectation of its being betrayed to him: and the day had been fixed between them on which they were simultaneously to carry out these plans.

Accordingly, Demosthenes went to Naupactus, and finding $Aeniadae compelled by all the Acarnanians to join the Athenian confederacy, and having himself raised all the allies on that side, and marched first against Salynthius and the Agraeans, and reduced them to subjection, he proceeded to make his other preparations for going at the proper time to Siphae.