History of the Peloponnesian War

But when the Tegeans said they would do nothing in opposition to the Lacedaemonians, the Corinthians, though hitherto very hearty in their measures, relaxed in their vehemence, and were afraid that none of the other parties might now come over to them. They went, however, to the Boeotians, and begged them to enter into alliance with themselves and the Argives, and act in all other respects in concert with them.

With reference to the ten days' truces also, which had been made with each other by the Athenians and Boeotians not long after the conclusion of the fifty years' treaty, the Corinthians desired the Boeotians to accompany them to Athens, and obtain the same for them also, on the same footing as the Boeotians; and in case of the Athenians not acceding to this, then to renounce the suspension of arms, and in future to make no truce without being joined by them. On the Corinthians preferring these requests, the Boeotians desired them to desist on the subject of the Argive alliance:

they went with them, however, to Athens, but did not obtain the ten days' truce; as the Athenians answered, that they were already in treaty with the Corinthians, inasmuch as they were allies of the Lacedaemonians.