History of the Peloponnesian War

As soon as the spring of the next summer commenced, the Argives, finding that the Boeotian ambassadors, whom they said they would send, did not come, and that Panactum was being demolished, and an especial alliance had been concluded by the Boeotians with the Lacedaemonians, were afraid that they might be left alone, and all the confederacy go over to the Lacedaemonians.

For they supposed that the Boeotians had been persuaded by the Lacedaemonians both to demolish Panactum and to accede to the treaty with the Athenians; and that the Athenians were privy to these measures; so that they themselves had no longer power even to make alliance with the Athenians: whereas they hoped before, in consequence of the existing dissensions, that if their treaty with the Lacedaemonians should not continue, they would, at any rate, be in alliance with the Athenians.