History of the Peloponnesian War

To the Argives and their allies such were the admonitions that were addressed. The Lacedaemonians, on the other hand, both individually amongst themselves, and with their national war-songs, exhorted one another, as brave men, to remember what they had learned before; knowing that actual training for a long time previous was of more benefit than a brief verbal exhortation, however well expressed.

After this the conflict commenced: the Argives and their allies advancing with haste and impetuosity; the Lacedaemonians slowly, and to the music of many flute-players, placed amongst them according to custom, not with a religious object, but that they might advance evenly, stepping in time, and so that their line might not be broken, a thing which large armies are apt to do in their approaches to an enemy.