[Finalgenesis]

Glamour aside, stealth troops can still ambush through switch from "hide" or "sneak" to "defend" (or patrol ...etc) the turn you expect an attack to come, your stealth units will not show itself until next turn, meaning if you predicted correctly enemy will have attacked your newly destealthed defenders in the next turn before they can change orders. If you predicted wrong and enemy did not move in that turn, your stealthed army is now destealthed and can be seen.