1. I see no problem with only non-artillery soldiers being able to enter them, but the whole “if they do, then they cannot move OR attack in the assault phase” seems clunky. What’s wrong with a simple movement roll? If you want it to be harder to get up just put a -1 on the roll.
Another item I might think about is not allowing units with “Thin Wheels” and/or Soldier-Motorcycles to ride up the side of mountains.
2. Except as noted for 1, seems fine.
3. Exactly what type of mountains are you picturing here? If anything they might be even more exposed on the mountains and not hidden (Again all depending on what you’re picturing). Unless you’re thinking of more forested mountains; in which case a ‘camoflauge’ type ability might work (or +1/+1 defence, +1 cover, steely resolve etc etc).
For playability this could skew things a bit, though that can simply be handled by where you place the mountains.
4. If infantry are so hard to spot, why are vehicles completely exposed? It’s still very likely they have places to hide, go hull down, or even be on the other side of the mountain, etc etc.
I also like the idea that being on a mountain gives you better LOS, though I’d want to keep it simple like Superior Optic on the Nashorn.
My suggestion would be:
Mountain Hex
- Provides cover
- Requires a movement roll with a -1 penalty (ie 5 or 6) to enter.
- Double movement for soldier-artillery to enter.
- Units which count as vehicles for the stacking limit, and units with thin wheels, may only enter mountain hexes along a road.
- Units on a mountain hex may ignore the one non-mountain hex blocking their LOS.
