Perhaps you should read a few. Persia has a habit of winning battles and losing wars.
After getting their butt kicked at Salamis and Plataea, the Persians would never again be a serious threat to most of the Greek city-states. In time, the Persian Empire would be defeated by a gay Macedonian-Greek prince, his tutor, and a handful of mercenaries.
Why bring his sexuality into it? Why not refer to Alexander as one of the greatest commanders who ever lived, a military genius who inspired his troops to push farther and harder to achieve military gains that had never before been achieved.