It was the Athenian and Plataian armies, which defeated the inferior Persian infantry caught without its cavalry support.
A Persian expeditionary force commanded by the Mede general Datis.
It was not the Greeks, it was Athens and its ally Plataia. The Athenians waited on the edge of the Plain of Marathon for reinforcement from Sparta. Then saw the superior Persian cavalry being embarked on ships and ran down and defeated the unsupported inferior Persian infantry.
Because the Persians didn't have patience and sent the horsemen in first and the strongest in the boat leaving their weakest variable to Greek attack. The Greeks won even though they were outnumbered, because of the general's mistake of not waiting for the Greeks to come to the Persian forces.
The Plain of Marathon was a plain, surrounded by hills where the Athenian infantry lurked to avoid the Persian cavalry. When the cavalry was embarked on ships, the Athenian infantry was able to run down and defeat the inferior Persian infantry, caught without their cavalry support.
Marathon was a plain, not a city. It was owned by Athens. They fought a battle against a Persian amphibious punitive expedition sent by Persia in 490 BCE.
The plain of Marathon , Greece .
Their armoured infantry were superior to the Persian infantry but were wary of the Persian cavalry on open ground on the plain of Marathon. The Athenians with their ally Plataia lurked in the hills waiting for the Spartans to arrive, but when they saw the Persian cavalry being embarked on the Persian fleet, they took the opportunity to run down and defeat the unprotected Persian infantry.
It was not 'the Greeks', it was the Athenian army with its ally Plataia. They attacked the inferior Persian infantry while their supporting superior cavalry was being loaded onto ships to attack Athens from the sea, with traitors to open the city gates to let them in. After defeating the Persian infantry, the Athenians ran the 26 miles back to Athens, arriving in front of the city as the Persian cavalry was being disembarked. Frustrated, the Persian expedition went home.
Marathon was a plain. The combined armies of Athens and Plataea defeated a Persian punitive expedition on the Marathon plain.
There was no city of Marathon. It was a plain 26 miles north of Athens.
Marathon was a plain. Athens and its ally Plataea defeated a Persian punitive expedition on the plain.