After reading some posts I would like to suggest two things over my original post.
Instead of giving bonuses, maybe changing positions might be better.
When you get ambushed, randomly shuffle the settings of the army getting ambushed? Maybe you will get cavalries in the front instead of having them in rear? + But let nobles with high leadership to keep their settings?
or
Make the ambushing army fight randomly picked TLs? But limit it so that you only fight the same number of TLs?
EX) If you ambush with 10 TLs, you face 10 TLs randomly selected from your enemy's army?
