The leader of Persia, Darius, led about 90,000 Persian troops to fight against the Greeks, with a total of between 10,000 to 20,000 troops.
As the Greeks approached the battlefield in a phalanx the Persians realized that the Greeks had a greater supply of weapons and armor, whereas they did not have as much armor nor weapons (mainly arrows).
The battle took place on 490 BCE. Many rapid arrows flew towards the greeks, but did little damage due to there lightness. The Greeks won the battle with 6,400 Persians done and 192 from the victorious. Persia went back to Asia but would be back.