Reconnaissance

After a spy misson you will see something like the following information:

Covert Mission Report
Under the cover of night, your spy sneaks into Enemy's camp.
Your spies move stealthily through Enemy's camp undetected. They are able to gather many documents recording the status of weapons, army size and preparedness, and fortifications. Unfortunately, in order to avoid detection, they are not able to provide complete information. Your Chief of Intelligence provides you with the information gathered:

Where your spies couldn't see everything are filled in with "???"and you won't have that information. You do have the option to Spy again which will usually result in another overlapping incomplete set of stats.The higher your Spy rating, and the lower the enemy's Sentry rating, the higher your rate of success will be.