History of the Peloponnesian War
Thucydides
Thucydides, Vol. 1-4. Smith, Charles Foster, translator. London and Cambridge, MA: Heinemann and Harvard University Press, 1919-1923.
Eurylochus and his men, perceiving that the army had entered and that it was impossible to take the town by storm, now withdrew, not to the Peloponnesus, but to the district of Aeolis, as it is now called, to Calydon, namely, and Pleuron, and the other towns of that region, and to Proschium in Aetolia.
For the Ambraciots came and urged him to join them in an attack upon Amphilochian Argos and the rest of Amphilochia, and at the same time upon Acarnania, saying that if they got control of these places all the mainland would be brought into alliance with the Lacedaemonians.
Eurylochus was persuaded, and dismissing the Aetolians remained inactive, keeping his army in these regions until the Ambraciots should take the field and the time should come for him to join them in the neighbourhood of Argos. And the summer ended.
The following winter the Athenians in[*](426 B.C.) Sicily, with their Hellenic allies and such of the Sicels as had been unwilling subjects and allies of the Syracusans but had now revolted from them and were taking sides with the Athenians, attacked the Sicel town Inessa, the acropolis of which was held by the Syracusans, but being unable to take it
they departed. On their retreat, however, the allies, who were in the rear of the Athenians, were attacked by the Syracusan garrison of the fort, who fell upon them and put to flight part of the army, killing not a few
of them. After this Laches and the Athenians took the fleet and made several descents upon Locris; and at the river Caicinus they defeated in battle about three hundred Locrians who came out against them, under the command of Proxenus son of Capato, took the arms of the fallen, and returned to Rhegium.