History of the Peloponnesian War

Upon knowledge hereof, the Argives betimes in the morning retired first to Argos and afterwards to the forest of Nemea, by which they thought the Lacedaemonians and their confederates would fall in.

But Agis came not the way which they expected, but with the Lacedaemonians, Arcadians, and Epidaurians, whom he acquainted with his purpose, took another more difficult way to pass and came down into the Argive plains. The Corinthians also, and Pellenians and Phliasians, marched another troublesome way. [Only] the Boeotians, Megareans, and Sicyonians were appointed to come down by the way of the forest of Nemea, in which the Argives were encamped, to the end that if the Argives should turn head against the Lacedaemonians, these might set upon them at the back with their horse.