Quote Originally Posted by Matty
Am I correct in thinking you only get the ambush bonuses if your hidden troops are officially 'hidden' (ie with the little tree symbol showing) immediately prior to their attack? Obviously they'll become visible when they move. I usually play on expert and the AI always sends out a scout - if you kill the scouting party (they don't get back to their lines to report) does the AI now know where my men are, or do they return to 'hidden'?
Correct. Basically trees. And once they return to hidden the rest of the AI units seem to forget about them until they discover them again.