Yea... I've done "attack faction" hundreds of times... for example, especially when playing Baktria or Saba... the stupid AS will either make peace with Ptolemies - that happened when I was Baktria, they concentrated on me the whole time, while Pahlava was eating away their heartlands they still sent their armies against me... Even though each and every single army died, utterly defeated... and I have used "attack faction" for the ptolemies a few times in that campaign, they accepted but never attacked the AS...

then as Saba, I was allied to them and they were fighting the Ptolemies, the AS never cared about me much... as soon as I conquered the one arabian territory next to their borders they started to sent full stacks down there... my army was still there, able to defend, beacause these towns were nicely developed over there I could retrain and it didn't break me but it's just so ridiculous and makes RPing impossible... I mean, they obviously have the money to send full stacks almost every turn but they don't use it on real threats (Ptolemies have taken all of Mikra Asia, cut the AS off the Mediterranean and the Pahlavan are eating their way down to Persepolis... no, they have to invest into attacking Arabia...

The Campaign AI's bias against the player is ridiculous and makes them ignore critical threats to their existence just to attack the player one more time...