For 10 points, name this 480 B.C.E. battle in which Leonidas of Sparta was defeated by Xerxes I.
The winning side in this battle went on to sack Plataea and Thespiae, and Hydarnes commanded the Immortals in this battle. When asked to put down his weapons, one leader in this battle replied "Come and get them," and this battle occurred simultaneously with the Battle of Artemisium. The traitor Ephialtes revealed a narrow mountain path to the invaders, and the losing force at this battle was eventually surrounded on a hill and mowed down by arrows. For 10 points, name this 480 B.C.E. battle in which Leonidas of Sparta was defeated by Xerxes I.
The winning side in this battle went on to sack Plataea and Thespiae, and Hydarnes commanded the Immortals in this battle.
Battle of Thermopylae