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.

But the Athenians, seeing the whole throng advancing and thinking it to be a detachment of the neighbouring Peloponnesians coming to assist the Corinthians, withdrew in haste to their ships, having their spoils and the bodies of their own dead, except two, which they left behind because they were not able to find them.

So they embarked and crossed over to the adjacent islands, and sending thence a herald recovered under truce the bodies which they had left behind. There were slain in this battle two hundred and twelve of the Corinthians, and of the Athenians somewhat fewer than fifty.