History of the Peloponnesian War
Thucydides
Thucydides. The English works of Thomas Hobbes of Malmesbury. Hobbes, Thomas. translator. London: John Bohn, 1843.
Some seventy days they lived thus thronged. Afterwards, retaining the Athenians, and such Sicilians and Italians as were of the army with them, they sold the rest.
How many were taken in all it is hard to say exactly; but they were seven thousand at the fewest.