So how do you control ninja???

I assume they are not invisible'while moving and can easily be slaughtered if intercepted en route to a target as they would be visible and weak against heavier elite troops.

my questions are

1) are they like chameleon/predator movies and practically invisible when standing still?

2)or are they invisble only while in wooded areas and if enemy troops go into these woods is it like predator films and all the enemy units are wiped out while blindly trying to find their opponents.even if nobody goes in the woods the ninja's are visible as soon as they leave the woods and have to hope their target is close by for a suprise attack?also if an enemy unit does go in the woods and don't see the ninja's and the player controlling the ninja's does not order an attack'do they just pass thru the woods and no combat takes place?

3)can ninja attack any unit'or are the specifically taisho killers?

hach