History of the Peloponnesian War

The Argives discovering this at daybreak, marched first to Argos and then to the Nemean road, by which they expected the Lacedaemonians and their allies would come down.

However, Agis, instead of taking this road as they expected, gave the Lacedaemonians, Arcadians, and Epidaurians their orders, and went along another difficult road, and descended into the plain of Argos. The Corinthians, Pellenians, and Phliasians marched by another steep road; while the Boeotians, Megarians, and Sicyonians had instructions to come down by the Nemean road where the Argives were posted, in order that if the enemy advanced into the plain against the troops of Agis, they might fall upon his rear with their cavalry.