So, no, you can't attack from the side. (By which I assume you mean "charge off to the side", because "from the side" makes no sense in a system without facing and wouldn't help with the geometry problem in any case.)Originally Posted by The SRD
In further mounted combat nonsense: The mount, again, is the one making the charge. The rider just gets the opportunity to attack at the end of the charge, and derives charge benefits from it if he takes that opportunity. There's nothing intrinsically wrong with that, but it means that you can't do the classic lance charge against a Medium opponent while mounted on a standard warhorse. See, the charge doesn't end until the horse makes its attack (and the horse must attack - it's the one making the charge). Warhorses have 5' reach. Lances have 10' reach, and don't threaten at 5'. At the end of the charge, when the rider gets the opportunity to make his attack, he doesn't threaten the target.