History of the Peloponnesian War

The same summer war broke out between the Epidaurians and Argives. The pretext was that the Epidaurians did not send an offering for their pasture-land to Apollo Pythaeus, as they were bound to do, the Argives having the chief management of the temple; but, apart from this pretext, Alcibiades and the Argives were determined, if possible, to gain possession of Epidaurus, and thus to insure the neutrality of Corinth and give the Athenians a shorter passage for their reinforcement from Aegina than if they had to sail round Scyllaeum. The Argives accordingly prepared to invade Epidaurus by themselves, to exact the offering.

About the same time the Lacedaemonians marched out with all their people to Leuctra upon their frontier, opposite to Mount Lycaeum, under the command of Agis, son of Archidamus, without any one knowing their destination, not even the cities that sent the contingents.