Perhaps the chance of the ambush succeeding should also depend on how many troops there are in the region. 200 men on their own would hide better than 200 men with 1000 who are preparing for battle.
Again, just trying to disuade the blobs, or atleast not benefit them.
I think the elimination of the separate battle makes sense. But I think some other bonus should exist beyond just invisibility. Some kind of (small) combat bonus.
