History of the Peloponnesian War

Thus spoke the Corinthians. And the Lacedaemonians when they had heard the opinions of all, put the vote in succession to all the allied states which were present, both great and small; and the majority voted for war.

But though the decision was made it was impossible for them to take up arms at once, as they were unprepared; it was determined, however, that the several states should make the fitting preparations and that there should be no delay. Nevertheless, in providing themselves with what was needed there was spent, not indeed a full year, but somewhat less, before they invaded Attica and took up the war openly.