History of the Peloponnesian War

Thus the Thebans say, and that the Plataeans did swear it. But the Plataeans confess not that they promised to deliver them presently but upon treaty if they should agree, and deny that they swore it.

Upon this the Thebans went out of their territory; and the Plataeans, when they had speedily taken in whatsoever they had in the country, immediately slew their prisoners. They that were taken were one hundred and eighty; and Eurymachus, with whom the traitors had practised, was one.

When they had done, they sent a messenger to Athens and gave truce to the Thebans to fetch away the bodies of their dead, and ordered the city as was thought convenient for the present occasion.