Wars of the Delian League Battle of Marathon. Between the two invasions, Darius died, and responsibility for the war passed to his son Xerxes I. Xerxes then led the second invasion personally in 480 BC, taking an enormous (although oft-exaggerated) army and navy to Greece. Those Greeks who chose to resist (the 'Allies') were defeated in the twin battles of Thermopylae and Artemisium on land and at sea respectively. All of Greece except the Peloponnesus thus fell into Persian hands, but then seeking to finally destroy the Allied navy, the Persians suffered a decisive defeat at the Battle of Salamis. The following year, 479 BC,
Arcadian League join its Peloponnesian League and fight in its wars. This dominance naturally aroused anger amongst these neighboring states, and Sparta's allies proved themselves willing to rise up against their overlord on several occasions. In 418 BC, Mantinea joined a league of Peloponnesian democratic states that briefly pursued an anti-Spartan policy before being defeated at the Battle of Mantinea (418 BC). After the end of the Peloponnesian War in 404 BC, Sparta, under king Agesilaus, took several opportunities over the ensuing years to discipline a number of restive allies. In 385 BC, the Spartans attacked Mantinea and forced the city to