History of the Peloponnesian War

In the middle of the next summer, the Lacedaemonians, seeing that the Epidaurians their confederates were tired and that of the rest of the cities of Peloponnesus some had already revolted and others were but in evil terms, and apprehending that if they presented it not the mischief would spread still further, put themselves into the field with all their own forces, both of themselves and their Helotes, to make war against Argos, under the conduct of Agis, the son of Archidamus, their king.

The Tegeats went also with them, and of the rest of Arcadia all that were in the Lacedaemonian league. But the rest of their confederates, both within Peloponnesus and without, were to meet together at Phlius; that is to say, of the Boeotians five thousand men of arms and as many light-armed, five hundred horse, and to every horseman another man on foot, of Corinthians two thousand men of arms, and of the rest more or less as they were; but the Phliasians, because the army was assembled in their own territory, put forth their whole power.