The Thessalians invade Phocis
The defeats of the Thessalians by the Phocians not many years before 480 (around 483 B.C.) are known from Herodotus. 8.27-28
The Thessalians and their allies had invaded the Phokian land, they had been defeated by
the Phokians and handled by them roughly. The Phokians had been
shut up in Mount Parnassos having with them a soothsayer, Tellias the
Eleian; and this Tellias contrived for them a device of the following
kind:--he took six hundred men, the best of the Phokians, and whitened
them over with chalk, both themselves and their armour, and then he
attacked the Thessalians by night, telling the Phokians beforehand to
slay every man whom they should see not coloured over with white. So
not only the sentinels of the Thessalians, who saw these first, were
terrified by them, supposing it to be something portentous and other
than it was, but also after the sentinels the main body of their army;
so that the Phokians remained in possession of four thousand bodies of
slain men and shields; of which last they dedicated half at Abai and
half at Delphi; and from the tithe of booty got by this battle were
made the large statues which are contending for the tripod in front of
the temple at Delphi, and others similar to these are dedicated as
an offering at Abai.
Thus had the Phokians done to the Thessalian
footmen, when they were besieged by them; and they had done
irreparable hurt to their cavalry also, when this had invaded their
land: for in the pass which is by Hyampolis they had dug a great
trench and laid down in it empty wine-jars; and then having carried
earth and laid it on the top and made it like the rest of the ground,
they waited for the Thessalians to invade their land. These supposing
that they would make short work with the Phokians, riding in full
course fell upon the wine-jars; and there the legs of their horses
were utterly crippled.