The Battle of Marathon was a pivotal battle in the Greco-Persian Wars, fought in 490 BC between the Athenian army and the Persian forces of King Darius I. The battle was fought on the plain of Marathon, about 25 miles from Athens, and resulted in a decisive victory for
From Wikipedia
The Battle of Marathon took place in 490 BC during the first Persian invasion of Greece. It was fought between the citizens of Athens, aided by Plataea, and a Persian force commanded by Datis and Artaphernes. The battle was the culmination of the first attempt by Persia under King Darius I to subjugate Greece. The Greek army inflicted a crushing defeat on the more numerous Persians, marking a turning point in the Greco-Persian Wars.