Book 10
1.10
Then did all Greece understand the oracle given to the Phocians by Apollo. For the watchword given in battle on every occasion by the Thessalian generals was Itonian Athena, and by the Phocian generals Phocus, from whom the Phocians were named. Because of this engagement the Phocians sent as offerings to Delphi statues of Apollo, of Tellias the seer, and of all their other generals in the battle, together with images of their local heroes. The figures were the work of the Argive Aristomedon.
1.11
Afterwards the Phocians discovered a stratagem quite as clever as their former ones. For when the armies were lying opposite each other at the pass into Phocis, five hundred picked men of Phocis, waiting until the moon was full, attacked the Thessalians on that night, first smearing themselves with chalk and, in addition to the chalk, putting on white armour. It is said that there then occurred a wholesale slaughter of the Thessalians, who thought this apparition of the night to be too unearthly to be an attack of their enemies. It was Tellias of Elis who devised this stratagem also for the Phocians to use against the Thessalians.
2.1
When the Persian army crossed into Europe, it is said that the Phocians were forced to join the Great King, but deserted the Persian cause and ranged themselves with the Greeks at the battle of Plataea. Subsequently it happened that a fine was inflicted on them by the Amphictyons. I cannot find out the truth of the story, whether the fine was inflicted because of the misdeeds of the Phocians, or whether the Thessalians exacted the fine from the Phocians because of their ancient hatred.