The Spartans were the most feared warriors in Greece and after their battles with the Persians, the most feared in all the world. Their tenacity combined with their superior fighting skills instilled anxiety in the enemy before the battle begun.
In addition, the Spartans possessed the laconic behavior which was best exemplified when King Leonidas was asked to have the Greek forces surrender their position. His reply: Molon Labe (pronounced Maw-lon Lah-veh) Come and get them!!!