How do spies work? The manual states that spies "improves the detection of enemy units (except Irregulars) within the Theatre by reducing Evasion Level by -1." However, "Theatre" is not defined in the manual. Is theatre the same as region or does it mean a larger land division? [Edit: Just searched the manual for "Theaters" and found the definition. Still interested in hearing the answers to my other questions, below, however.]
Also, do spies work best alone or as part of a stack? I figure that they are afforded some protection as part of a stack, but then they lose most of their stealthiness. For example, if I want to scout an enemy force, would it be best to send a spy or an Irregulars unit? What if I wish to scout an enemy structure to see what enemy units might be inside?
I hope that these questions are not too simplistic or have been answered elsewhere, but I could not find any mention of it either in the manual or with a forum search. I am currently playing the demo, but plan to download the full game in the near future. Thank you for your assistance.