Don't know if this is a bug, but I'll put it here anyways.
I have some strange AI behaviour to report whilst using Formations AI and NAtive AI with Formations:
I enlisted into the army of Conte Gerluchs as a Crossbowman, and somehow my commander seems to have missed some important lessons in tactics...
Whilst using Formations AI when fighting the sarranids, I observed him a few times to order the Crossbowmen to walk into the bulk of the enemy forces without protection by any infantry.
It looked as if they had been given the advance order..... In the meanwhile, the infantry stood on the hill doing nothing?
(Noobish question, but is it somehow possible that the AI mixed inf and archers? So that he wanted the inf to "walk" into the enemy and the archers to stand behind?)
After observing this "tactic" twice (and loosing both battles^^), I switched to Native AI with formations.
Here, our commander had the archers line up in front of the infantry and fire upon the enemy, but when the enemy cavalry charged, the infantry didn't respond. Some of them went into bracing position, but that's it...
Also, with both settings, I observed some other strange behaviour with the infantry. All men were constantly unequipping their shields, the equip them again, unequip, equip and so forth. Why would they do that, especially under enemy fire?