Thornburne, ok I conceed that Civ was made with scale of land in mind, as I vaugely recollect the "x Miles figure" too, ok but one other thing your assuming is that one archer unit can't fill X miles of land, what makes you assume this is just one archer.. or one platoon, maybe it represents 50 million archers, in which case it would fit nicely in the XX miles of land.

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LOL... well, that would fit your theory, but I am sure that even the most diehard "gameplay > realism" supporters would have to say that would be too unrealistic of a stretch! That same screen, however, does list number of troops as well, though I haven't figured out the equation to determine how much each unit consists of to equal that number.
Nonetheless, I should not that I am Sicilian and, as the saying goes, "NEVER go in against a Sicilian, when death is on the line!!!

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Anyway enough talk of realism and whether or not it is in the game or if it is important, I would like to talk about 1UpT mechanics but not in here, we are kind of hijacking this nice thread,
The Downside of 1UpT (thread title wasn't called limited stacks like I thought ^>^, 28 pages of detailed anaylsis on 1UpT and SOD and Limited SOD. So yeah, that should tell you what you need to know).
Why not bring back Civ3 armies as apposed to 1UpT A smaller thread where the 1UpT vs Limited stacks discussion also took place.
Read what you can when you can, some of the detailed explanations of why Limited stacks are not as good from a tactical/gameplay point of view will hopefully be clear
I'll try to go through it when I can, but there is a lot to go through. Though I am sure that there are solutions to any problem that I encounter. It may take some time, but I will try to draft of a mechanic system that would work... (no worry, I will not put it in this thread).
And no where is it indicated or suggested that Indirect fire will be blocked by mountains, also Direct fire is not even confirmed to be blocked by mountains (it was never borught up), although that is a reasonable assumption certainly on direct fire, you would need to shoot around it, just like you have to shoot around a hill or forest tile to get to a tile 2 hex's away with an archer that isn't placed on a hill themselfs. But this isn't confirmed to be true, perhaps they illogically decided to allow shooting over mountains lol, but certainly its not as likely to be on indirect fire as much, because of the nature of indirect bombardment, it doesn't require a direct line of sight so the fact that a mountain would be in the "direct way" won't necessarily remove the ability to shoot over it. Although its still a good possibility that Indirect Fire is limited by the laws of physics too

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Actually, I believe they mention in the recent podcast (from Firaxis... might have been elsewhere that I have heard/read it) that units will not be able to shoot over forest unless they are on top of a hill. From that, I would assume that you would not be able to shoot over a mountain. Otherwise, it would be inconsistant.
I would not be surprised, however, if some
more modern units are able to (like Battleships, Missle Cruisers, Rocket Artillery, etc).