It demonstrated the strength of the Greek hoplite phalanx. The hoplite phalanx was a formation of heavily armed infantry that was used by the Greeks and other ancient civilizations. The phalanx was very effective in defending against cavalry and other mounted troops, and it played a key role in the Greek victory at Marathon.
It helped to unify the Greek city-states. The Greek city-states were often divided by rivalries and internal conflicts. However, the victory at Marathon helped to unite them against a common enemy. The experience of fighting together against the Persians helped to create a sense of Greek national identity.
It inspired the development of Greek literature and art. The victory at Marathon was a source of great pride for the Greeks, and it inspired them to produce some of their most famous works of literature and art. The battle was celebrated in poems, plays, and sculptures, and it became a symbol of Greek courage and strength.