Battle of Thermopylae

(480BC September 8-10 or Aug. 20) Wiki

Known of: The brave 300 spartan held the whole persian army for 7 days at Thermopylae
Location: Thermopylae, Greece
Result: Military Persian victory / Strategic Greek victory
Unique unit in the game: Spartan hoplite - Best warriors of that time. Never retreating, fearsome soldiers.

Battle of Thermopylae map

Sides Greek city-states Persian Empire
Leader King Leonidas I,
Demophilus
King Xerxes I of Persia,
Mardonius,
Hydarnes
Army 300 Spartans,
700 Thespians,
400 Thebans 
70,000–300,000