A citizen's military rank depends on the total damage they have dealt in battles.
Citizens with higher ranks deal more damage in battles.
Every hit you deal will increase your XP by 1 point.
How to Deal More Damage
You can deal more damage by fighting with weapons. There are 5 quality types of weapons, from 1 to 5, the higher quality the item it is, the higher damage you will have.
Additionaly, you can deal more damage using buffs.