Discover the Lost Art Cloak of Shadows and build the Hall of Shadows to perform Spying missions. Upon recruiting several Silent Ones, dispatch them to another Lord's Castle to spy on their forces. Your Grand Marshal will inform you of the outcome of your spying attempt and any information collected. Spying missions allow you to get a full picture of the number and type of Units in other Castles and the amount of Resources they have to Raid. Your Silent Ones can be defeated by a targeted Castle's Silent Ones if they're outnumbered of if the Castle's Intelligence Bonus is high enough.
Spying missions can be performed in 2 ways: