In this documentary we explore the Greco-Persian wars to understand why the Persians failed to conquer Greece. The video begins with a historical overview of the Achaemenid Persian Empire and then an analysis of the Ionian Revolt which led to war. We then look at what the Persian army of Darius and Xerxes wished to achieve and see to what extent these objectives were met. This includes looking at the Battle of Marathon, Thermopylae, Salamis, Mykale, and more which featured Greek armies of Athens, Sparta and more.