Athens was north of Corinth and she had a navy. Athens' leader Themistocles wanted to fight the Persians by the island of Salamis. Xerxes decided to send his fleet against the Greek fleet before the Greek ships could go to the Peloponnese. The Greek fleet defeated the Persians at the Battle of Salamis. Xerxes then went home with many of his soldiers but a Persian army stayed in Greece. This army was defeated at the Battle of Platea in 479 BC.