History of the Peloponnesian War

The same summer the Lacedaemonians marched into Arcadia with their whole levy under Pleistoanax, son of Pausanias, king of Lacedaemon, against the Parrhasians, who were subjects of Mantinea, and a faction of whom had invited their aid. They also meant to demolish, if possible, the fort of Cypsela which the Mantineans had built and garrisoned in the Parrhasian territory, to annoy the district of Sciritis in Laconia.

The Lacedaemonians accordingly laid waste the Parrhasian country, and the Mantineans, placing their town in the hands of an Argive garrison, addressed themselves to the defence of their confederacy, but being unable to save Cypsela or the Parrhasian towns went back to Mantinea.

Meanwhile the Lacedaemonians made the Parrhasians independent, razed the fortress and returned home.