+ Campaign: Slightly easier (more replacements, bigger bonuses, more effective bombardment, tweaked some max HPs of some unit types, etc)
+ Tweaking city-combat : Factors for bonuses: distance to own city (both sides), size of the city (defense), setting (ramp the bonus up), penalty for motorized/armored attack, penalty for attacking with a weak/small/low-quality unit, extra bonus if defending own supply city, being encircled nulls some defense bonuses