History of the Peloponnesian War

In the course of this same summer, the Olynthians assaulted and took Mecyberna, which was garrisoned by Athenians.

After these events, conferences being continually held between the Athenians and Lacedaemonians respecting the possessions of each other which they still retained, the Lacedaemonians, hoping that, if the Athenians should receive back Panactum from the Boeotians, they would themselves recover Pylus, went on an embassy to the Boeotians, and begged them to deliver up to them Panactum and the Athenian prisoners, that they might recover Pylus in exchange for them.

But the Boeotians refused to deliver them up, unless they would make an especial alliance with them, as with the Athenians. Although therefore the Lacedaemonians were aware that they should be acting wrong to the Athenians, since it had been stipulated that they should make neither peace nor war with any but by mutual consent; yet, as they wished to receive Panactum from them, believing that so they should recover Pylus, and as the party which was anxious to break up the treaty earnestly entered into the Boeotian negotiation; they concluded the alliance, when the winter was now closing and the spring at hand; and Panactum was immediately begun to be demolished. And thus ended the eleventh year of this war.