-- for balance :
1) Citizen soldiers can should either be in economic mode or weaponized mode. In economic mode they can gather or build, but if immediately are forced into combat they are limited to melee nd slightly better than a Spartan woman at fighting. To change to weaponized mode, where they have their full combat strength, they must first vist a house or city center and drop anything they are carrying (wood, food etc). This simulates them 'arming up', or if they carry nothing then they can simply visit a house to 'arm up'.
2) Citizen soldiers in economic mode should move 10% faster than their weaponized counterpart
3) In weaponized mode, citizen soldiers have a 'food bar' which slowly decreases when away from the aura of house, civ center, barracks. When the food bar drops to zero the citizen soldier reverts to economic mode and must visit a house / civ center to reenter weaponized mode. Being within the aura of a friendly caravan shiould also reset the food bar.
4) City centers should no longer fire arrows. Instead, the city center should provide an armor bonus to all freindly units in its aura. In this way the village level can also see invasion (currently it is insane to attack a civ center at the village phase, which is highly unihistoric)