[Jazzepi]

The order that your commanders (mages) act is determined by a hidden number called their Unit ID. This is a unique number that each unit has to keep track of them in the game. Apparently they're also recycled after a unit dies.

What's more important is that you can not see this ID number, so the only way to tell which units will act first in combat is to have all those units in a single province, go to army setup, and look at the order in which they appear. This is the order they will act during a battle.

The problem with this is that if you have two armies that you want to merge in a large fight, both with communion masters/slaves in them, it's impossible to tell which order they'll act in. In that case, you can not rely on your communion slaves for combat casting as the order that they act in is unpredictable.

Jazzepi