Louis Francois Lejeune – Battle of Marengo, 14 June 1800Passage du Rhin par l’armée française à Dusseldorf, 6 septembre 1795 Château de Versailles

The picture has something of this: group, many, people, military, vehicle, battle, war, crowd, recreation, landscape, skirmish, army, weapon, man, tree, rebellion, action, group together.
Perhaps it’s a painting of a large group of people on a field next to a body of water with boats in the water and people in the foreground.