firstly, those are miniatures you are talking about. if you would want them to be slaughtering an enemy army, you\'d need at least 2 models on the base. this would mean a bigger base, making the model illegal for gaming purposes.
secondly, most ancient wars were being fought in a pretty regulated fashion (medieval armies would not fire one arrow until told to) thus, until the battle got actualy underway, you would be pretty save standing on a roch or something (provided you paid attention and got down before the enemy was told to shoot at you)
Finaly, these mini\'s are representations of mighty heroes, some artistic freedom should be allowed, the model would have been depicted in the most heroic way possible, not the most realistic way (most paintings of medieval kings show these king standing triumphant on a battlefield, all of these paintings are made after the battle is over, nine times out of ten, the king was posing in the comfort and safety of his own palace, with the battlescene added later on)
suffice to say, i enjoy building and seeing \"unrealistic\" yet heroic bases.
that said, i consider rider AND horse climbing a steep rock or something a bit much, lets try and keep it at least physicly possible.
please correct me if i get any historical references wrong.