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.
And so on this occasion the Mantineans extended with their right wing far beyond the Sciritae; and the Lacedaemonians and Tegeates further still beyond the Athenians, inasmuch as their army was larger.