Spartan Mora regiments at Battle of Plataea

[PMBardunias]

perioikoi did not serve in the peloponnese as a rule, nor in the Spartan Army itself, save for certain Aristocratic 'volunteers' who were permitted to accompany the King on campaign - but I don't want to digress into another debate about perioikoi !

Please digress, for this comes as a suprise to me (and evidently to Herodotus and Xenophon). Source me, baby!

Hdt. 9.11.3

[3] Having no knowledge of this, the envoys questioned them further as to the meaning of this and thereby learned the whole truth; they marvelled at this and hastened with all speed after the army. With them went five thousand men-at-arms (o??????) of the Lacedaemonian countrymen. (??? ????????? ?????????????)

Xen. Hell. 7.4.27
[27] As for the Lacedaemonians, they afterwards went against Cromnus again by night, made themselves masters of the stockade which was opposite the Argives, and immediately proceeded to call forth the Lacedaemonians who were besieged there. Now all who chanced to be nearest at hand and seized the opportunity promptly, came forth; but such as were forestalled by a large body of the Arcadians which came to the rescue, were shut off inside the stockade, captured, and distributed. And the Argives received one portion, the Thebans one, the Arcadians one, and the Messenians one. And the whole number who were captured of the Spartiatae and the Perioeci came to more than one hundred.

Someplace I have an old paper by Toynbee where he accounts for the missing lochoi at Mantinea by proposing that each Spartiate lochoi was brigaded with one made up of Periokoi- Thukydides simply calling the joint "mora" by the appellation Lakedaemonian.