The Battle of Austerlitz Francois Pascal Simon Gerard (1770-1837)

The picture has something of this: people, group, many, war, military, skirmish, man, weapon, cavalry, army, soldier, battle, wear, vehicle, crowd, rifle, revolution, group together, battlefield.
Perhaps it’s a painting of a large group of men on horses and men in uniforms standing on the ground with their backs to each other and holding flags in their hands.