Thucydides 5.70 (AR 29): Spartans advancing to sound of aulos at Battle of Mantinea (418 BCE). After this they joined battle, the Argives and their allies advancing with haste and fury, theLacedaemonians (= Spartans) slowly and to the music of many auletes (aulos-players)—astanding institution in their army, that has nothing to do with religion, but is meant to make them advance evenly, stepping in time, without breaking their order, as large armies tend to do in the moment of engaging.

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