History of the Peloponnesian War

The Phoceans and Locrians also began a war at that time against each other.

And the Corinthians and Argives, being now league, went to Tegea to cause it to revolt from the Lacedaemonians, conceiving it to be an important piece [of Peloponnesus], and making account, if they gained it to their side, they should easily obtain the whole.

But when the Tegeates refused to become enemies to the Lacedaemonians, the Corinthians, who till then had been very forward, grew less violent and were afraid that no more of the rest would come in.

Nevertheless they went to the Boeotians, and solicited them to enter into league with them and the Argives and to do as they did. And the Corinthians further desired the Boeotians to go along with them to Athens and to procure for them the like ten days' truce to that which was made between the Athenians and Boeotians presently after the making of the fifty years' peace, on the same terms as the Boeotians had it; and if the Athenians refused, then to renounce theirs and make no more truces hereafter without the Corinthians.