Please be aware of the Forum Rules of Conduct.
Well, that's not strictly true.In a region where there has been no battle has taken place, if it is a rogue region, any rogues will be defenders. If it is not a rogue region, they will be the attackers.
What happens if there is a battle between two realms, and in the first one there are rogue units joining the attackers, and the attackers win? Will the rogues join the victorious side and defend the next turn, or will the still join the attacking side?
I believe that if two human armies enter a region that should both side to defeat the monsters before going on to fight eachother, I think its silly that the monsters aid one side or the other.
Think of it this way if it helps. The two human armies form up opposing each other. The trumpets sounds, the battle is joined and then some damn monsters come out of nowhere and attack one of the armies. Its not a "co-ordinated" assistance, one army doesn't some how control the monsters, they just show up and do their thing.
It would be easier to think of it this way if that behaviour was not, in fact, predictable, and sometimes used by marshals and generals.
Then you can think about it in terms of one side herding the rogue unit towards the enemy.
Accuse a realm of siding with abominations=evil-Or even a character.