Louis Francois Lejeune – Battle of Mount Thabor, 16 April 1799 Château de Versailles

The picture has something of this: group, people, many, outdoors, man, landscape, daylight, water, mountain, recreation, vehicle, military, herder, skirmish, cavalry, mammal, war.
Perhaps it’s a painting of a large group of people on horses in a field with a mountain in the background and clouds in the sky in the foreground.