Quote Originally Posted by WesW
The AI gets a hardcoded accuracy bonus for their field volleys. Basically they are as accurate as siege volleys. Would be interesting to know if this is a bug.

I suspect it's not so much a bug per se as it is a piece of code the programmers either didn't have time to review during the polishing stages, or they simply forgot about it. Or as a third possibility, perhaps it never really even occurred to them to change the code--I would guess they'd focused more on the artillery code as it applies to smashing down walls, and not so much on smashing enemy troops.