History of the Peloponnesian War
Thucydides
Thucydides. The history of the Peloponnesian War, Volume 1-2. Dale, Henry, translator. London: Heinemann and Henry G. Bohn, 1851-1852.
But the Epidamnians gave no ear to them. Whereupon the Corcyraeans went against them with forty ships, together with the banished men, with a view to restore them;
taking with them the Illyrians also. And sitting down before the city, they made proclamation, that such of the Epidamnians as would, and all strangers, might depart safely; otherwise they would treat them as enemies. But when they did not obey them, the Corcyraeans proceeded (the place being an isthmus) to besiege the city.
Now the Corinthians, when news was brought from Epidamnus of its being besieged, immediately began to prepare an army; and at the same time proclaimed a colony to Epidamnus, and that any one who would might go on a fair and equal footing; and that if any one should not be willing to join the expedition immediately, but still wished to have a share in the colony, he might stay behind on depositing fifty Corinthian drachmas. And there were many both that went, and that paid down the money.