Just played my first game against Japan. I noticed some villagers standing around and knew all mine were assigned tasks. So I selected one and sure enough - Shinobi.
Are there any units that can see them? If you palisade or wall off your village are they stuck on the outside or can they walk right through the gates? Any tips for dealing with these #######?
IIRC they can be revealed by landmark tc, outposts and scouts.
I think, You can attack them even without reveal with scout
Their disguises will disappear if they are in range of a scout or an outpost (not sure about landmark Town center), and nearby units and outposts will attack them automatically like any other enemy unit. If they are disguised, you can still order a manual attack command on the unit.
Enemy shinobi cannot walk through your gates. However, they have a smoke bomb ability which is essentially a short-ranged teleportation. This can be used to go through walls. (While I have not done this myself, I have witnessed the enemy AI do this several times.)
They can do that? I need to try that!!!