Answer:
1.The second Persian invasion of Greece (480–479 BC)Xerxes led the attack.Xerxes had spent years planning his invasion of Greece. It was to be his 'divine punishment' for his father Darius' crushing defeat at Marathon in 490 BC(thats why)
2. simplify if you wanna . The invasion began in spring 480 BC, when the Persian army crossed the Hellespont and marched through Thrace and Macedon to Thessaly. The Persian advance was blocked at the pass of Thermopylae by a small Allied force under King Leonidas I of Sparta; simultaneously, the Persian fleet was blocked by an Allied fleet at the straits of Artemisium. At the famous Battle of Thermopylae, the Allied army held back the Persian army for three days, before they were outflanked by a mountain path and the Allied rearguard was trapped and annihilated. The Allied fleet had also withstood two days of Persian attacks at the Battle of Artemisium, but when news reached them of the disaster at Thermopylae, they withdrew to Salamis.
3.Battle of Salamis, (480 bc), battle in the Greco-Persian Wars in which a Greek fleet defeated much larger Persian naval forces in the straits at Salamis, between the island of Salamis and the Athenian port-city of Piraeus. ... The Greeks sank about 300 Persian vessels while losing only about 40 of their own
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