Excellent contributions here, guys.
Another offensive way to use spies is to tip a faction over the edge into civil war when you are attacking them.
When you attack and defeat two provinces in one year, the target faction leader takes a big hit of disloyalty from his generals. If you have flooded all his OTHER provinces with your own spies, you can get spectacular results inciting civil war and rebellion, after which you are only faced with a whole bunch of isolated, bribable armies instead of a concerted force.
I build Bawdyhouse upgrades as soon as possible. They are essential to my style of conquest.
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