Guide to Farming Inactives.
1. Gather a decent army of mostly infantry, cavalry, and a few archers JUST for farming inactives.
2. Look on your map and you will find plenty of lvl 0-2s or maybe even higher to scout but have no troops or very little troops and high amounts of resources.
3. Take your Farming Army and hit the inactive city you want.
4. If there is traps and turrets forward your archers to wipe out the turrets and then forward your infantry to remove the traps. (this should only take a few of your infantry). Now you get the resources and/or prestige from killing their troops and raiding their city.
Any questions on this further, PM me.