I did not see this out in the wild (and have never seen it in earlier builds), but I was attacking magnar early and took 3 cities of his.  2 of those battles had an issue where the defending AI would take damage and retreat correctly, but after their lead (strong spearmen) had been taken down, the 3-4 other defenders who had originally retreated did not want to fully commit to attacking my only remaining archers (all my folk were dead besides the archers).

Defenders would go towards me 3 tiles, back up 2, 3 forward, back up 2.  Had they rushed my archers it would have been game over for me.

It was more of a scattering pattern though.  None of the AI moves looked to have any logic.

Its hard to explain I guess.  It looked like 4 mice in a maze without any cheese in it.  I just picked them all off with the archer and took the city.

Played one level below expert, AI the same.

My archers were a quest reward if that helps.

I can get more specific if need be.  Come to think of it it has to be the defending AI behavior towards the archer.

Anyway, Im having fun.  Would love to see ALL the town details when your choosing what to pick when they level.  I also find myself consistently addicted to the unrest and population numbers more than I feel I should be.  15% unrest for not being contiguous borders is a little harsh.  After all, our Jamaican friends have enough herb to keep them happy out there on the island, eh?  Hawaiians are a pretty mellow group too.  Just a thought.

I cant believe I've been playing this game for 2 years now.  Good work fellas.