The southern Greek cities determined to destroy the Persian fleet to remove this threat, so that they could then concentrate their armies against the Persian army. They first tried to do this by blocking the pass at Thermopylai to force the Persians to bypass it with a naval outflanking move through the strait of Artemesion nearby, and the combined Greek fleet lay in wait to defeat the Persian fleet. The Greek fleet lost, so it retired to the strait at Salamis to regroup and try again. Here they defeated the Persian fleet.
The result was that the Persians had to send half their army home, as they could not feed it as their resupply fleet could not supply it with the naval protection gone, and the Greeks were able to send out their armies to concentrate at Plataia the following spring with the amphibious threat to their cities gone also. The Greek coalition won the battle of Plataia, and the Persians went home.