To this plan Demosthenes consented, not only to please the Messenians, but also in the belief that by adding the Aetolians to his other continental allies he would be able, without aid from home, to march against the Boeotians by way of Ozolian Locris to Kytinium in Doris, keeping Parnassus on his right until he descended to the Phocians, whom he could force to join him if their ancient friendship for Athens did not, as he anticipated, at once decide them to do so.
Arrived in Phocis he was already upon the frontier of Boeotia.
He accordingly weighed from Leucas, against the wish of the Acarnanians, and with his whole armament sailed along the coast to Sollium, where he communicated to them his intention; and upon their refusing to agree to it on account of the non-investment of Leucas, himself with the rest of the forces, the Cephallenians, the Messenians, and Zacynthians, and three hundred Athenian marines from his own ships (the fifteen Corcyraean vessels having departed), started on his expedition against the Aetolians.
His base he established at Oeneon in Locris, as the Ozolian Locrians were allies of Athens and were to meet him with all their forces in the interior.
Being neighbors of the Aetolians and armed in the same way, it was thought that they would be of great service upon the expedition, from their acquaintance with the localities and the warfare of the inhabitants.
After bivouacking with the army in the precinct of Nemean Zeus, in which the poet Hesiod is said to have been killed by the people of the country, according to an oracle which had foretold that he should die in Nemea, Demosthenes set out at daybreak to invade Aetolia.
The first day he took Potidania, the next Krokyle, and the third Tichium, where he halted and sent back the booty to Eupalium in Locris, having determined to pursue his conquests as far as the Ophionians, and in the event of their refusing to submit, to return to Naupactus and make them the objects of a second expedition.