Well, I was just building up defense for my last game, and she took over a babarian city, then she declares war. I have 3 Chariots and a Warrior in a starting city right next to the Barbarian city she took, and it was building archers. She just ran right over that with horse archers, and razed it, after killing the 2 archers that I rushed.
I was in full military mode, and build a bunch of horse archers (there was jungle in between) and spearman to counter her horse archers. Even for battles that I was having higher odds, she was killing off my troops. She got these magical 3 unit upgrades for her archers (and other units), which are city defenses. There's no way she could've pulled a West Point, and I doubt there's a Hero's Epic. And this is fricking warlord - i.e. odds should be in my favour. I couldn't capture the babarian city (there was iron there). I couldn't prevent her from going ape on me. I had to bring in another civ to fight her (not that it made a difference), and it made me so frustrated. I mean I could station spearman and her horse archers would take them out.
I swear there's something wrong with that particular AI. There's no pleasing her unless you share her religion, and she'll just target the only human in the game. It is super-rare that I've seen her declare war on another nation that didn't share her religion (one out of at least 5). I mean afterall, my last game was standard size map, there was like 3 other civs with my religion on the same continent.