History of the Peloponnesian War

It was by this time getting late, and the paean had been sung for the attack, when the Corinthians suddenly began to back water. They had observed twenty Athenian ships sailing up, which had been sent out afterwards to reinforce the ten vessels by the Athenians, who feared, as it turned out justly, the defeat of the Corcyraeans and the inability of their handful of ships to protect them.

These ships were thus seen by the Corinthians first. They suspected that they were from Athens, and that those which they saw were not all, but that there were more behind; they accordingly began to retire.

The Corcyraeans meanwhile had not sighted them, as they were advancing from a point which they could not so well see, and were wondering why the Corinthians were backing water, when some caught sight of them, and cried out that there were ships in sight ahead. Upon this they also retired; for it was now getting dark, and the retreat of the Corinthians had suspended hostilities.