Schreyer Adolf Arab Chieftain And His Entourage Adolf Schreyer (1828-1899)

The picture has something of this: cavalry, people, seated, mammal, sword, man, group, wear, skirmish, veil, herder, armor, warrior, helmet, weapon.
Perhaps it’s a painting of a group of men riding on the backs of horses in a field next to a man on a horse and another.