The French Campaign 1861 Jean-Louis Ernest Meissonier (1815-1891)

The picture has something of this: cavalry, mammal, seated, people, group, motion, equestrian, transportation system, man, horse, two, wear, cowman, race, vehicle, livestock, herder, action energy.
Perhaps it’s a painting of a man riding on the back of a white horse in front of a group of men.