So the idea is that most people use horses, but in this deserted mountain range, people have had to adapt to rams, so the breeding, domesticating and all of that has been handled over generations.
Now, much like dogs to wolves & horses to wild horses, Rams have been trained to be ridden over mountains and into war, up steep cliffs and thin ledges, pretty much all the normal ram stuff with people riding them.
Would this be possible? Would there actually be any technical advantage in warfare if this were medieval times? Would horses being taller stand a better chance? And would rams even be able to support the weight of a rider in the first place? Or would they just buckle under the weight? Could they evolve to support the weight? Mainly, I just want some pros and cons to using rams in warfare, it seems like a good idea, but it might be a horrible one. I don't think feeding them would be a problem though, they eat almost anything I think.
I also had the idea of them ramming horses, and possibly breaking bones, but that might have been a bit of an extreme idea. I just wanted to know my limitations on the matter. And I always like to think of dogs, they all came from one animal, but have been bread to as little as jack russels to hunt foxes down in there holes and as big as Karelian dogs for bears. So I always wonder what selective breeding for certain traits can do to make things possible.