History of the Peloponnesian War

Having persuaded the allies by their arguments, all of them except the Argives proceeded at once against Orchomenus in Arcadia; the Argives, though convinced, remained behind at first, then later came on too.

Taking post before Orchomenus, they all proceeded to besiege it and to make assaults, being especially desirous of getting possession of it because hostages from Arcadia were deposited there by the Lacedaemonians.