アカイア同盟
The ephors urged Cleomenes also to take the "Athenaeum", a fortress on the road between Sparta and Arcadia. The fortress belonged both to Megalopolis and to the Achaean League. The Achaean League saw this move by Sparta as a declaration of war. Aratus, again "strategos", tried to organise nightly attacks to regain control of Tegea and Orchomenus, but was betrayed by his partisans in both cities, who told Cleomenes of the plan.