The dramatic conclusion to this trilogy explains the reversal of fortunes and final defeat of Xerxes’ Persian invasion of Greece; not as unlikely as usually presupposed. The focus is on the successful repulse of the Persian massive armada at Salamis, a resounding naval victory with parallels to the English defeat of the Spanish Armada. Along with the backstage policies and cloak-and-dagger events, the analysis of hard data of naval and military realities and environment shows the reason for this outcome and more so of the closely fought double campaign of the following year that ended the Persian threat. The massive land victory at Plataea that ousted the empire form mainland Greece and crippled its armies, and the amphibious operation at Mycale that destroyed the remnants of the royal Grand Armada and shut the doors to further Persian incursions in Greece is examined in detail. Manousos Kambouris examines in depth the plans, potential, assets and liabilities of the two protagonists to explain command decisions and developments in the field. This is a fine finale to this fresh appraisal of these hugely significant events.