History of the Peloponnesian War

Not long after this envoys came from the Argives with the proposals that have been mentioned; and the boeotarchs assented to their proposals and sent them away with a promise to dispatch envoys to Argos to negotiate the alliance.

In the meantime it was determined by the boeotarchs and the Corinthians, the Megarians, and the envoys from Thrace, first, to bind themselves by oaths one to another, that assuredly when occasion offered they would assist the one that needed help and would not go to war with anyone or make peace without a common agreement; and that then and only then the Boeotians and the Megarians—for they were acting in concert[*](cf. 5.31.6.)— should make a treaty with the Argives.