History of the Peloponnesian War

When the captives were brought to Athens, the Athenians determined to keep them in prison until some agreement should be reached, but if before that the Peloponnesians should invade their territory, to bring them out and put them to death.

They also placed a garrison in Pylos, and the Messenians at Naupactus, regarding this territory as their fatherland—for Pylos belongs to the country that was once Messenia—sent thither such of their own number as were best fitted for the task and proceeded to ravage the Laconian territory, and they did a great deal of damage, since they were men of the same speech as the inhabitants.