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I've never seen this asked before and its something I'm quite curious about. At the time of Alexander's invasion Persia was the largest, wealthiest and most powerful empire in the near and middle east, if not the world. Yet in six years Alexander managed to conquer it. The only this feat came close to this was
the Arab conquest in the seventh century but that was after the Sassanians had been exhausted by decades of war and about five years of succession crises. So why? What made the Macedonian army so much better than the Persians? Or opposite what made the Persians so inferior to the Macedonians?
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