Spaulding's "Manuscript Found" mentions a character riding a horse.
Kent Jackson, "Chapter 14," Manuscript Found: The Complete Original "Spaulding Manuscript" (Provo: Religious Studies Center, BYU, 1996)
Hamboon mounted on an eligant Horse richly caparosened, rode thro’ the encampment—proclaiming aloud ev<e>ry man to his Station, seize your arms & prepare for battle= All his princes quik to obey their Commander, instantly repaired to their respective divisions—& gave orders <to> form the men into solid columns—When this was done—they marched a small distance to the pl & per<r>added on the great plain of Ge<he>no—They were now prepared for the hostile engagement—Their officers of the highest Ranks marched along the in front of their divisions—& by their speaches they inspired the men with boldness & courage—They ardently wished to behold their enimies—& to have an oppertunity of displaying their valour in their destruction. Hamboon then commanded his principal officers to assemble around him—When they were collected which was in front of the army, he thus addressed them.—I wish for your opinions, my brave [p. 145 [1] ] & heroic Commanders, had each a chosen band of warriors, who were ordered as soon as the battle should begin to march betwen the divisions & charge the enimy. in order to break their order & throw them into confusion.—The design of this arangement was to break their Ranks & throw them into confusion.