The Histories · 7.148

The spies then, having thus looked at everything and after that having been dismissed, returned back to Europe: and meanwhile those of the Hellenes who had sworn alliance against the Persian, after the sending forth of the spies proceeded to send envoys next to Argos. Now the Argives report that the matters concerning themselves took place as follows:--They were informed, they say, at the very first of the movement which was being set on foot by the Barbarian against Hellas; and having been informed of this and perceiving that the Hellenes would endeavour to get their alliance against the Persians, they had sent messengers to inquire of the god at Delphi, and to ask how they should act in order that it might be best for themselves: because lately there had been slain of them six thousand men by the Lacedemonians and by Cleomenes the son of Anaxandrides, and this in fact was the reason…

Herodotus of Halicarnassus · trans. G. C. Macaulay, 1890
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