... thing about "invisibility" is that.. your realm know it's there.. so it's not a secret. (think back channel/ooc spying)
so for ambush to work, it would have to work inside a battle.. rather than you can't see them in scout report. it's a case of... you know they got a lump of troops in the region.. but you don't know where in the region and what they are doing.... which i guess sounds a bit counter-intuitive when you can see them in the scout report...
how do you stop a massive army ambushing a small one? the more troops there are in a region, the easier it is to annul an ambush.
what does ambush do? lower enemy troop morale probably.
how will it work? does each commander have to click ambush? maybe. don't know.
