Don't know. Caesar's also fought enemies who had the same kind of troops he has, led by a VERY skilled general, very close to him in military skills. Alexander didn't face any worthy enemy who led another hammer-and-anvil makedonian army. I consider it a military genius because he ALSO defeated the nomads, because most of the hammer-and-anvil tactic had been developed by his father.
Caesar didn't fought nomads as well as Alexander didn't face makedonian army and tactics and military skilled generals. I think they are comparable.
TOTALLY false that Alexander fought a united enemy. Persian army was a freaking puzzle led by a military idiot. Persian satraps turned against Darius many times, and ultimately killed him. Alexander took the entire Egypt without fight, after the fall of Tyrus IIRC.
Also, Alexander totally failed in creating a united empire: he could never keep its conquests even if he didn't die so young. His Successors were very very skilled men, but failed too. Taking down the Persian Empire was a very delicate matter, and Alexander lacked the patience and the political skill needed.
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