I don't know if you have ever played an RTS or Age of Empires, but you build a base, not a city, it's only combat based. So you have a resource collector unit and you collect food, wood, gold, and favor of the gods in various ways. You then use those resources to construct buildings to expand how many units you can build, what types of units you can build, and improvements to units, resource collection and buildings. You then "age up" which is just a different term for moving to the next tier of units, buildings and upgrades with the ultimate goal to defeat your opponent. It is entirely combat focused. You and your opponent are building armies in an attempted to destroy the other's base.