What is a Spy?
A Spy is a stealth troop. They can be used to gain to discover information on Wildernesses and other player Cities.
As a stealth troop, Spies have the ability to spy on Wilds and Cities. When a Spy is successful, they will return to your City with different information about troop quantities and research levels. It is always a good idea to Spy a location before you attack it, so that you can learn as much about your opponent as possible.
How do I train a Spy?
Spies can be trained by building a Level 2 Garrison in your City and researching Level 1 Clairvoyance. It is possible to gain even more accurate information from your Spies if you research Clairvoyance to a higher level.