Year 479 BC was a year of the pre-Julian Roman calendar. At the time, it was known as the Year of the Consulship of Vibulanus and Rutilus (or, less frequently, year 275 Ab urbe condita). The denomination 479 BC for this year has been used since the early medieval period, when the Anno Dominicalendar era became the prevalent method in Europe for naming years.
The Battle of Plataea in Boeotia ends the Persian invasions of Greece as the Persian general Mardonius is routed by the Greeks under Pausanias, nephew of the former Spartan King, Leonidas I. The Athenian contingent is led by the repatriated Aristides. Mardonius is killed in the battle and the Greeks capture enormous amounts of loot. Thebes is captured shortly thereafter and the Theban collaborators executed by Pausanias.
In 479 BC, when Persian soldiers besieged the Greek city of Potidaea, the tide retreated much farther than usual, leaving a convenient invasion route. But this wasn't a stroke of luck. Before they had crossed halfway, the water returned in a wave higher than anyone had ever seen, drowning the attackers. The Potiidaeans believed they had been saved by the wrath of Poseidon. But what really saved them was likely the same phenomenon that has destroyed countless others: a tsunami.