The Battle of Salamis ~ see related link below .
Battle of Marathon 17th September 490 bc
Take your pick - Salamis, Mycale, Eurymedon, Cyprus and others.
Which battle.
Plataea.
Salamis.
the Aegean sea
Which battle - there were many, but the Greeks won by superior strategies and tactics.
It was not the Greeks but the Greek city-state of Eretria.The Persians then switched to Athens which defeated them at Marathon.
The Greek city-states of peninsular Greece and the Aegean.
450 BCE Cyprus.
They defeated them in a sea battle at Salamis.