Battle of Mantinea
The Spartans, who were not members of the League of Corinth and had not participated in Alexander's expedition, saw in the Asian campaign the long-awaited chance to take back control over the Peloponnese after the disastrous defeats at the Battle of Leuctra and Battle of Mantinea. The Persians generously funded Sparta's ambitions, making possible the formation of an army 20,000 strong. After assuming virtual control of Crete, Agis tried to build an anti-Macedonian front. While Athens remained neutral, the Achaeans, Arcadians and Elis became his allies, with the important exception of Megalopolis, the staunchly anti-Spartan capital of Arcadia. In 331 BC Agis started to besiege the city with his entire army, forcing Antipater to act.