For each square of land you capture by attacking another nation, your nation will gain some XP. The amount of XP earned is based on the number of hit points that the defending square had. So, if your nation defeats an enemy square that had 16 hit points, typically you will receive 16 XP. There are a few factors that can alter that amount, however:
- The number of XP you earn is multiplied by your nation’s Geographic Efficiency. So, if your Geographic Efficiency is 100%, you’ll earn the full amount of XP (16 XP in this example), but if it’s only 50%, say, then you’ll only earn half of the XP (8 XP).
- If the defending nation’s level is less than the attacking nation’s level by at least 16% (or by 5 levels, whichever is greater), then the amount of XP the attacker can earn by capturing a square from this lower level nation is halved.
- If the defending nation’s level is less than the attacking nation’s level by at least 33% (or by 10 levels, whichever is greater), then the attacker cannot earn any XP by attacking this much lower level nation.
- If the combat stat being used by the attacker is more than twice the value of the combat stat being used by the defender, then the amount of XP the attacker can earn by attacking this much weaker nation is reduced somewhat, to a degree that depends on how much more powerful the attacker is than the defender.