But, you could make a map that is juts a tunnel, no bridges, no roof etc. Here's a sketch of such a map:

But is there a way to prevent aircraft from flying over the walls? Set a maxheight for air units?
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Nope :\Jools wrote:But is there a way to prevent aircraft from flying over the walls? Set a maxheight for air units?
this is probably a reasonable option.Jools wrote:One option would be to disable air units completely then, as xta does on some maps 'because of low atmospheric pressure".