With the implementation of fantasy powers like that of the Byzantine Emperor's, the battles in M2TW and future TW games will be just another un-realistic, crappy RTS.

Fenring: Particulary this one. I hope, but it doesn't seem very likely, that it's a strat map ability - i.e. convince an army to turn on its comrades before a battle, similar to bribe.
I hope so too, perhaps as soon as the battle starts the units are put under the Byz player's control and wreak havoc in enemy lines.