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.
The Boeotians, then, did not any the more on that account renounce their ten days' truce, though the Corinthians called on them to do so, and expostulated with them on the ground of their having agreed to do it. Between the Corinthians, however, and the Athenians there was a suspension of arms [*]( By ἄσπονδος is meant a mere agreement in words, not ratified by the solemnities, of religion. And the Greeks, as we have seen, considered the breach of their word very different from the breach of their oath. See II 5.7. —Arnold.) without any actual truce.
The same summer, the Lacedaemonians made an expedition with all their forces, under the command of Pleistoanax, son of Pausanias, their king, into the country of the Parrhasians in Arcadia, who were subject to the Mantineans, and who had invited their interference in the spirit of faction: intending also, if they could, to demolish the stronghold at Cypsela, which, being situated in the Parrhasian territory, the Mantineans had fortified and garrisoned with their own troops, for the annoyance of the district of Sciritis in Laconia The Lacedaemonians therefore proceeded to ravage the land of the Parrhasians;