Thucydides, History of the Peloponnesian War
Benjamin Jowett, Ed.

7. During the same winter the Lacedaemonians and their allies, all but the Corinthians, made an¹ expedition into the Argive territory, of which they devastated a small part, and, having brought with them waggons, carried away a few loads of corn. They settled the Argive exiles at Orneae, where they left a small garrison, and having made an agreement that the inhabitants of Orneae and the Argives should not injure one another's land for a given time, returned home with the rest of their army. [2] Soon afterwards the Athenians arrived with thirty ships and six hundred hoplites. They and the people of Argos with their whole power went out and blockaded Orneae for a day, but at night the Argive exiles within the walls got away unobserved by the besiegers, who were encamped at some distance. On the following day the Argives, perceiving what had happened, razed Orneae to the ground and returned. Soon afterwards the Athenian fleet returned likewise. [3] The Athenians also conveyed by sea cavalry of their own, and some Macedonian exiles who² had taken refuge with them, to Methonè on the borders of Macedonia, and ravaged the territory of Perdiccas. [4] Whereupon the Lacedaemonians sent to the Thracian Chalcidians, who were maintaining an armistice terminable at ten days' notice with the Athenians, and commanded them to assist Perdiccas, but they refused. So the winter ended, and with it the sixteenth year in the Peloponnesian War of which Thucydides wrote the history.