Leonidas was at war with Persian people. The Greek army was scarce so they decided to make a tactic to defeat the giant army of Persia. The plan was to fight in the strait of termopilas
I am Leonidas and the army and I are going to fight with persian people
In August-September 480BC during two fulls days of battle the small force led by Leonidas blocked the only road by wich the massive persian army could pass
After the second day ,a local resident called Ephialtes betrayed the Greeks by revealing a small path that led behind the Greeks lands
I know a way :)
Because of that,they died because the Persians are more and the Greeks fail the battle
The Greeks caused a powerful impact on the enemy troops, killing the brothers of Xerxes and causing the Persians lost all kinds of invading force. Therefore, during some battles that occurred after this, the Persians were eliminated very easily so the persians invasions ended at last.