History of the Peloponnesian War

The next winter, they that were with Ramphias went presently forward as far as [the hill] Pierium in Thessaly. But the Thessalians forbidding them to go on, and Brasidas, to whom they were carrying this army, being dead, they returned homewards, conceiving that the opportunity now served not, both because the Athenians were upon this overthrow gone away and for that they themselves were unable to perform any of those designs which the other had intended.

But the principal cause of their return was this: that they knew at their coming forth that the Lacedaemonians had their minds more set upon a peace than war.