The previous year the Persian invasion force , led by the Persian king in person , had scored victories at the battles of Thermopylae and Artemisium and conquered Thessaly , Boeotia , Euboea and Attica .
The previous year , the Persian invasion force , led by the Xerxes in person , won the Battles of Thermopylae and Artemisium , and conquered Thessaly , Boeotia and Attica .