This is a tactic I have learned as Pontus in order to keep Arche Selukeia off my back. This works well if your empire borders with a large or huge city that is distant from the enemy's capital.
First, attack the city. Then after killing the enemy inside do NOT enslave or extrerminate. You must click occupy. You are not there to loot money, and you need to have a lot of people in the city in order for the tactic to work.
And then, destroy all military structures, followed by anything that improves health, happiness or law. You may destroy the economic buildings too if you want. This ensures that the city gets maximum unrest. Then put at least 5 spies in the city. Finally, pack all of your units out of the city and then GIVE THE CITY TO YOUR ALLY!
If you did this, the city will be then instantly filled with allied garrison. You can then sit back and focus on improving the economy of the empire.
In my Pontus campaign I captured Antiocheia from the Selukids and then gave it to the Ptolemies. Then I just retreat to Tarsus and see them butcher one another for the worthless city.
I don't need to worry about my ally attacking me either. Antioch is so full of unrest that Ptolemaics have to fully garrison the city. But even with their full garrison the city still suffers from riots, thanks to my spies.
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