History of the Peloponnesian War

On the first day he took Potidania, on the second Crocyleum, on the third Teichium. There he remained, sending his booty back to Eupalium in Locris; for his intention was to subdue the other places first, and then, in case the Ophioneans would not submit, to return to Naupactus and make a second expedition against them. But all these preparations did not escape the notice of the Aetolians, either when the design was first being formed or afterwards;

indeed his army had no sooner invaded their country than they all began to rally in great force, so that help came even from the remotest tribes of the Ophioneans, who stretch as far as the Maliac Gulf, and from the Bomians and Callians.

The Messenians, however, gave Demosthenes about the same advice as at first: informing him that the conquest of the Aetolians was easy, they urged him to proceed as quickly as possible against the villages, not waiting until they should all unite and array themselves against him, but trying to take the first village in his way.

Yielding to their advice and being hopeful because of his good fortune, since he was meeting with no opposition, he did not wait for the Locrians, who were to have brought him reinforcements—for he was greatly in need of lightarmed men that were javelin-throwers—but advanced against Aegitium and took it by storm at the first onset. For the inhabitants secretly fled and took post on the hills above the city, which stood on high ground about eighty stadia from the sea.

But the Aetolians, who by this time had come to the rescue of Aegitium, attacked the Athenians and their allies, running down from the hills on every side and showering javelins upon them, then retreating whenever the Athenian army advanced and advancing whenever they retreated. Indeed, the battle continued for a long time in this fashion, alternate pursuits and retreats, and in both the Athenians had the worst of it.