On the Fact that the Persian Invasion of Greece In 480 BC Didn't Just Include Persian Troops but Also Lydian, Egyptian, Phoenician, Scythian, Babylonian, Kushite, Medes, Sogdian, Bactrian, and Even Indian Forces (from Regions Already Conquered)

While subsequent empires (British, Mongol, Spanish, Muslim, etc.) ultimately supplanted it as the largest in history, up 'til that time, the world had seen nothing like it............and the fact that the Greeks were finally able to repel them (at the battle of Salamis), wow, WOW (though, yes, it wasn't until Alexander the Great that the Persian dominance truly started to wane).