History of the Peloponnesian War
Thucydides
Thucydides. History of the Peloponnesian War. Crawley, Richard, translator. London and Toronto: J. M. Dent and Sons Ltd.; New York: E. P. Dutton and Co., 1914.
Meanwhile the popular party at Argos little by little gathered new consistency and courage, and waited for the moment of the Gymnopaedic festival at Lacedaemon, and then fell upon the oligarchs. After a fight in the city victory declared for the commons, who slew some of their opponents and banished others.
The Lacedaemonians for a long while let the messages of their friends at Argos remain without effect. At last they put off the Gymnopaediae and marched to their succor, but learning at Tegea the defeat of the oligarchs, refused to go any further in spite of the entreaties of those who had escaped, and returned home and kept the festival.
Later on, envoys arrived with messages from the Argives in the town and from the exiles, when the allies were also at Sparta; and after much had been said on both sides, the Lacedaemonians decided that the party in the town had done wrong, and resolved to march against Argos, but kept delaying and putting off the matter.