History of the Peloponnesian War
Thucydides
Thucydides, Vol. 1-4. Smith, Charles Foster, translator. London and Cambridge, MA: Heinemann and Harvard University Press, 1919-1923.
But now, when this difficulty arose, the Corinthians and the envoys from Thrace went away without accomplishing their purpose; and the boeotarchs, who had before intended, if they carried these measures, to try to effect also the alliance with the Argives, did not now bring before the councils the matter concerning the Argives, nor did they send to Argos the envoys they had promised; and there was neglect and delay in the whole business.
In the course of this same winter, the Olynthians by a sudden attack captured Mecyberna[*](A port town of Olynthus; cf. 5.18.7.) which was garrisoned by the Athenians.
After this, while conferences were continually going on between the Athenians and Lacedaemonians about places belonging to one or the other which they respectively held, the Lacedaemonians, in the hope that, if the Athenians should get back Panactum from the Boeotians, they themselves might recover Pylos, sent envoys to the Boeotians and begged them to deliver up Panactum and the Athenian prisoners to themselves, in order that they might recover Pylos in exchange for these.