Spies and unrest

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Spies and unrest. I have not tested this extensively, but every time my LE Man spies have tried to instill unrest, they are immediately caught and killed. I also understand that if an enemy instills unrest in one of your provinces, you get a warning message.

It seems to me that in multiplayer, spies are going to get caught very quickly, much faster than in Dom 2. You have no hope the other player will not notice for a few turns and then start patrolling and/or increasing PD. Further, it seems that spies get caught pretty quick by regular levels of PD.

Have I just been unlucky, or has there been a real nerfing of spies and unrest?

Are there any good suggestions on how to use them well? My favorite target has always been the enemy capital, as you can limit their special troop recruiting. Rich provinces were the second choice.

Thanks for your thoughts!