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.
After this the Peloponnesians, under the command of Pleistoanax son of Pausanias, king of the Lacedaemonians, advanced into Attica as far as Eleusis and Thria, ravaging the country; but without going further they returned home.
Thereupon the Athenians again crossed over into Euboea under the command of Pericles and subdued the whole of it; the rest of the island they settled[*](Setting up democracies, etc. cf. C.I.A. iv. 27 a.) by agreement, but expelled the Hestiaeans from their homes and themselves occupied their territory.
Withdrawing their troops from Euboea not long afterwards they made a truce with the Lacedaemonians and their allies which was to last for thirty years, restoring Nisaea, Pegae, Troezen, and Achaea; for these were the places belonging to the Peloponnesians which the Athenians then held.
Six years later a war arose between the Samians and the Milesians about the possession of Priene, and the Milesians, who were being worsted in the war, went to Athens and cried out against the Samians. They were seconded in their complaint by some private citizens from Samos itself who wished to revolutionize the government.
So the Athenians sailed to Samos with forty ships and set up a democracy, taking as hostages of the Samians fifty boys and as many men, whom they deposited in Lemnos;