Battle of Mycale
The Battle of Mycale was fought as part of the war of the Persian Empire under Xerxes against the Greek city states. It took place after the decisive Greek victory at the Battle of Plataea being fought in August 479 B.C. In a foolhardy move the Spartan general Leotychidas landed the Greek forces at Mycale and attacked the much larger Persian army. However, as the battle began, the Ionian Greek soldiers in the Persian army changed sides. The Greeks won a complete victory capturing Mycale and the Persian fleet.
Encyclopedia of Military History, Dupuy & Dupuy, 1979