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.
And now the Lacedaemonians and Argives, each a thousand strong, took the field together, and the Lacedaemonians by themselves went and put the government of Sicyon into the hands of a smaller num ber than before, and then both of them together also put down the democracy at Argos, an oligarchy being established, in accordance with the interests of the Lacedaemonians. These things occurred at the close of the winter, when spring was now near at hand; and so ended the fourteenth year of the war.
The following summer, the inhabitants of Dium on Athos revolted from the Athenians to the Chalcidians; and the Lacedaemonians settled the affairs of Achaia, which before had not been suitable to their views.
And now the commons party at Argos, gradually combining and recovering their spirits, made an attack upon the oligarchical party, having watched their opportunity, when it was just the time of the Lacedaemonian Gymnopaediae. And a battle having been fought in the city, the commons gained the victory, and slew some of them, and banished others.
The Lacedaemonians, while their friends had been sending for them a long time before, did not go; but at length put off the Gymnopaediae, and marched to their aid. On hearing at Tegea that the oligarchical party had been defeated, they would not advance any farther, though entreated by those who had escaped;