History of the Peloponnesian War

Thus they all sat down before Orchomenus, and besieged it, and made assaults upon it; being for other reasons desirous to get possession of it, and especially as some hostages from Arcadia were deposited there by the Lacedaemonians.

The Orchomenians, alarmed at the weakness of their wall and the number of the hostile forces, and fearing, since no succours had arrived, that they might perish before they did, surrendered on condition of joining the confederacy, giving hostages of their own to the Mantineans, and delivering up those whom the Lacedaemonians had deposited with them.