How can 300 macho men stop 300,000 troops? What is Spartan?

In 480 BC, King Xerxes I of Persia (Rodrigo? Santoro) commanded 500,000 troops (the so-called five million men) and more than 1,000 warships to attack Greece on a large scale. All the way south to the demobilization channel. The powerful Xerxes I also sent a letter of surrender to the Greek city-state, hoping that the small country would surrender without a fight. This naturally includes Sparta. As a result, Xue Xisi's emissary suffered greatly in the resistance of many Greeks. At this time, in order to resist the strong enemy, the brave Spartan king Leonidas (Gerard? Butler) led about 7000 Greek allied forces assembled from all over the country to rush to the hot spring pass first to guard the pass with dangerous terrain.

On the other hand, the Persian army, which consumed a huge amount in the fierce naval battle, was obviously unable to organize any powerful offensive in the two-day land war. Therefore, close combat between the two armies is not imminent. But two days later, the cunning Xue Xisi sent an elite force to sneak attack the mountain pass, and the unprepared Greek defenders were quickly defeated. Leonidas in order to save strength, ordered the Greek coalition forces to retreat quickly. I personally led 300 people behind the Spartan. In the end, all 300 warriors died, and the Persian army paid a painful price of 20,000 casualties in the battle against Hot Springs?