In Genghis Khan 2 if an enemy bordering you has small army you can conquer it, then special tax the population until loyalty goes to zero, then send all your troops back to territory you attacked from, then send all the gold and food to your territory, then allocate labor to 100 special labor, then recruit general to make him leader, then go back your territory allowing the general to be killed...

You effectively deactivated a territory and turned it in a wasteland without food or gold which kills army units and in constant revolt which kills army units, and can't restore loyalty after natural disasters.

Why? You can recapture with ease later to conquer the world and it's killing armies for you automatically without management.