Sir Charles Warre Malet’s String of Racehorses at Exercise Francis Sartorius

The picture has something of this: cavalry, mammal, herd, livestock, grassland, grass, agriculture, landscape, cattle, outdoors, sheep, farm, herder, pastoral, seated, field, people, wildlife, pasture.
Perhaps it’s a painting of a group of horses and jockeys on a green field with trees in the distance and a blue sky with white clouds in the background.