Ephialtes of Trachis betrayed a Greek army led by the “300 Spartans” when he revealed a strategic flaw to the Persians, resulting in a Greek defeat at which battle?

The Quiz: Ephialtes of Trachis betrayed a Greek army led by the “300 Spartans” when he revealed a strategic flaw to the Persians, resulting in a Greek defeat at which battle?

Battle of Thermopylae
Battle of Marathon
Battle of Salamis
Battle of Aegospotami
Battle of Leuctra

The correct answer to this quiz is Battle of Thermopylae.