and is now your enemy!"

I found the above message in changes.txt so it's possible for you to get attacked by your ally[ies] in battle field. Have you had your ally turning on you on the battle field? Although there's an entry in the loc file, this kinda stuff rarely happens in campaign. I actually have not experienced something like that.

Now I figure this does/can happen on mp battles but regardless, CA should tweak this for sp campaign, don't you think? Say if your king isn't that influential, your army is outnumbered by your ally, or that disputed province belongs to your ally in the period, then should alignment switch happen.