Louis Francois Lejeune – Battle of Aboukir, 25 July 1799 Château de Versailles

The picture has something of this: people, beach, group, seashore, many, water, ocean, sea, palm, vacation, vehicle, island, sand, man, recreation, tree, bird.
Perhaps it’s a painting of a war scene with a large group of people in the foreground and onlookers on the other side of the water.