From the book:
Little Sorrel, the beloved war horse of one of the South's greatest generals, was originally a Northerner, and at fourteen hands, was among the smallest mounts of any officer on either side. A Confederate general once called him "a sorry chestnut with a shambling gait," but one of Jackson's aides said that in battle "the old sorrel horse seemed endowed with the style and form of an Arabian." Although he was the regular mount of one the war's greatest risk-takers, he survived Stonewall Jackson by twenty-three years and received a hero's funeral more than a century after the end of the Civil War.
The horse is preserved and stuffed and can be seen at the Virginia Military Institute Museum (for real).