Direct Fire with range exceeding 12

[Matt W]

If people are looking for an answer and not detailed justification I would say that the hill situation is obvious and fire should be permitted but that the town situation is less so and failing any additional input I would say no fire beyond 12 hexes, if for no other reason than the terrain is not perfectly flat and at 2 and a half kilometers we're dealing with some significant distance.

However, feel free to use your own interpretations. There really aren't many situations where this will occur.

As an aside, is this addressed in Modern? If so, it might prove to be a guide.