Equestrian Portrait Of Field Marshal Sir Jean Louis Ligonier Daniel Morier

The picture has something of this: cavalry, seated, people, mammal, wear, lid, man, saddle, military, sword, equestrian, horse, two, bridle, veil, rider, horseback.
Perhaps it’s a painting of a man in a red uniform riding a black horse in a field with other people on the other side of the painting in the background.