 Near at hand, they forced the city of Mantinea in Arcadia, to disband into its constituent villages.The largest intervention was a campaign in 382 BC to break up the federalist Chalcidian League in northeastern Greece, as violating the autonomy principle of the Great King's decree.On the way there, in 383 the Spartan commander Phoebidas, invited by a pro-Spartan faction, seized the Theban Kadmeia (the Theban acropolis) and left a Laconophile oligarchy supported by a Spartan garrison; even the pro-Spartan Xenophon could only attribute the act to madness.