Enemy AI

Each Region has 3 rival armies.

Some rivals are more aggressive and more likely to behave unpredictably than others.

Each difficulty setting uses different AI logic. On easy, the AI grows slowly and is not very aggressive, although it may occasionally surprise you. On medium the AI has no handicaps and plays more aggressively. On hard, the AI knows you are a threat and plays the most aggressively (be sure to use truces to reduce your combat fronts).

Enemy armies will try to expand their territory, if they have extra soldiers. They prefer to expand into more valuable regions ($$$$) or regions that have few enemy dealers. On the easy difficulty, enemy armies are more likely to attack regions that appear underpowered. On medium and hard, the AI will estimate your likely power based on the value of the region.

The AI plays by the same rules you do. So you can defeat an enemy in a few ways:
 * Kill off his best knights
 * Reduce the respect of his knights (they will abandon him)
 * Reduce his income by taking his most productive regions
 * Continually defeat him in combat
 * Terrorize him with assassins
 * Steal his funds (find and take his supply wagons)