Art De La Guerre

[Andy Fyfe]

[Neep]

These things have all been worked out in geometry. An area is within another area even if an edge of one is coincident with the edge of another.
Sounds like those Spaniards are asserting that there must be at least an epsilon of width between the two edges when in ambush. That's an idiosyncratic interpretation of "in". It's nuts.

As noted by Mike, a Wood with a properly irregular (continuously curving) outline would prevent a unit within the wood from exiting it with a 1UD advance.

[Ramses II]

Ok ecnomus, because you refer to an Ambush marker, there are two parts to the answer

1. Geometry:
   • When a 1UD base moves 1UD, its rear edge will clear the ‘shadow’ of its original location.
   • An ambush marker may be placed so that it is aligned with the straight edge of some terrain.
   • The rear edge of a 1UD base placed on this marker will clear the terrain if it moves 1UD
   • As noted by Dickstick, some terrain does not have a straight edge, in which case, placing the marker ‘entirely within’ such terrain must inevitably result in some terrain being in front of the marker.
     This would prevent a base which makes a 1UD move from clearing the terrain.
   • While there can be translation issues, here “in” is the same as “within”
   
   
2. The process of revealing an ambush.
   As explained above, there may not be 1UD space between the ambushing MI and the enemy MI because of the process of revealing an ambush. In which case the rear of the ambushing MI will not be able to clear the terrain 

[ecnomus]

Many thanks to everyone for your answers. Now everything is completely clear !!
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Ecnomus