History of the Peloponnesian War

In the first days of the summer following, the Argives, seeing that the promised ambassadors from Boeotia did not arrive, and that Panactum was being demolished, and that a separate alliance had been concluded between the Boeotians and Lacedaemonians, began to be afraid that Argos might be left alone, and all the confederacy go over to Lacedaemon.

They fancied that the Boeotians had been persuaded by the Lacedaemonians to raze Panactum and to enter into the treaty with the Athenians, and that Athens was privy to this arrangement, and even her alliance, therefore, no longer open to them—a resource which they had always counted upon, by reason of the dissensions existing, in the event of the non-continuance of their treaty with Lacedaemon.

In this strait the Argives, afraid that, as the result of refusing to renew the treaty with Lacedaemon and aspiring to the supremacy in Peloponnese, they would have the Lacedaemonians, Tegeans, Boeotians, and Athenians on their hands all at once, now hastily sent off Eustrophus and Aeson, who seemed the persons most likely to be acceptable, as envoys to Lacedaemon, with the view of making as good a treaty as they could with the Lacedaemonians, upon such terms as could be got, and being left in peace.