Hey, all! Here's an excerpt from a chat with a Civ AI coder!
[Soren_Johnson_Firaxis] [...] I am glad you brought this up. The AI get NO combat bonuses of any kind at any difficulty level. I understand that many people have a hard time believe this but let me give an anecdote [...] at one point in the project, people complained that combat was unfair, so I said I would change some things, and what I did was give the _human_ a combat bonus. Then people told me that combat was once again "fair." It is all in the eye of the beholder
[Soren_Johnson_Firaxis] [...] I am glad you brought this up. The AI get NO combat bonuses of any kind at any difficulty level. I understand that many people have a hard time believe this but let me give an anecdote [...] at one point in the project, people complained that combat was unfair, so I said I would change some things, and what I did was give the _human_ a combat bonus. Then people told me that combat was once again "fair." It is all in the eye of the beholder