skeleton_horse ??????

Don't think that should be anything to do with it!

No...to make a mounted standard bearer ( I assume that is your intention ) you are going to have to make a new entry into the descr_model_battle text file. Copy the basic details of the standard bearer, and give it a new name.

Then change THIS NEW UNIT to use a horseman skeleton. You also have to set up all the other text files to define it's combat stats and tell it what horse model to use. Once the rider model is using skeleton and animations from a mounted unit, he will sit and ride the horse correctly.

Leave the horse skeletons alone!

You need to define this as a new unit, or else EVERY standard bearer will be posed as if he were sitting on a horse...and that will look just plain ODD!