Megalomaniacs don't really like working together.

There would be too much in-fighting among them to gain control, weakening their chances of military conquest.

There is only one force I can think of that could possibly cope with these gentlemen and that would be Jesus Christ Super Star.

It is my thoughts they would all cancel the other out in power as one strong power but only be controlled by the forces of Good…

I highly doubt that any 2 of those men would've cooperated enough not to kill each other the very first day. And if you put all of them there, there would be a massacre. No one will have a problem defeating a country in which the commanders can't agree who's the top boss. (And a military genius is almost always sure to have an ego to match).

None of them would have been willing to be subordinate,or even equal, with any of the others.

Julius Caesar once said "I would rather be the first man in a barbarian village than the second man in Rome."

All of them would have this attitude,so they'd kill each other off on day 1.