The rules state that Ambushes can only be placed where the ambush would not be visible from anywhere in the opponent's half of the table. If I want to place an ambush in a Wood or Forest the terrain chart simply says Troops visible at 2BW or 1 BW respectively. So looking from outside of the terrain piece, does this mean that to be in ambush I must place the card more than 2BW/1BW within the terrain, not on the edge.  Just looking for clarification that this is correct as the visibility rules are slightly short on detail. 

My interpretation is that an UG in a terrain is visible from a certain distance of it's current position . So you do not need to be 2 MU IN the terrain, you may be at the edge but you will be identified when the spotting distance is reached, 1,2 or 3 MU depending on terrain and also pay attention on the type of UG that may be concealed 

You can be on the edge of the terrain, but must be more than the visibility distance from the centre of the table.

Richard

The thing that made me think twice about how this worked was the use of the phrase 'in the opponents side of the table' rather than 'from the opponents  deployment zone'. This makes a subtle difference for ambushes placed near the table centre line but is clearer for those placed further back. Many thanks for the replies.