I know this has probably come up before, but here's my 2c after what happened in my Portugal campaign last night.

Ver 1.02 on H/VH with 2 turns per year.
I'm also trying the Chiv approach this time round, which I'm quite liking. Which for me means no backstabbing, slaughtering prisoners or assassins.

The Scene.
I was busy consolidating after booting the Moors off of the mainland, and taking over Zaragoza and Valencia. The Spanish only have both starting provinces still. I have a marriage alliance with France, Scicily, and Hungary. Also Allied with the Pope and Denmark. I have Outstanding/Perfect relations with all, except Denmark which is very good.

My problem was that France were allied to the Spanish, so attacking the Spanish was a big No No, as I wanted to keep things with France cool for now. However France started a war with Scicily, and the Spanish called off the alliance with France. Yay

The Incident.
Just as I was getting ready to take out the Spanish in 1 turn, which I try to do to avoid his holiness' wrath, one of the Spanish full stacks turns Rebel.

However the very next turn this full stack of Rebel Mailed Knights and Jinettes, was taken out by 3, yes 3 units of mailed knights led by another Spanish captain. I mean c'mon, I'm a good general but there is no way in Hell that the AI could have won that one fairly and squarely. No upgrades on either army. I was speechless.

It's the first time I've seen the AI cheat to that degree. Anyone else have any other weird AI victories, that shouldn't have happened?