You should also be careful not to accidentally give the A.I. instructions, because as far as i know, there is no way to cancel it and return them to normal, so you will have to babysit them afterwards by telling them to move and attack...And there doesn't seem to be any difference between the 3 instructions, since they all tell the A.I. to go there, and that's what they do. I think it's more for multiplayer than skirmish, really...