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.
Having, then, so disposed his troops, Agis came down into the plain and proceeded to ravage Saminthus and other places.
The Argives discovered this and, it being now day, came to the rescue from Nemea. and falling in with the force of the Phliasians and Corinthians slew a few of the Phliasians, but had rather more of their own men slain by the Corinthians.