Claude Gautherot – Napoleon Addressing the 2nd Corps of his Army at the Bridge over the Lech at Augsburg, Germany, on October 12, 1805 Château de Versailles

The picture has something of this: people, wear, group, military, many, man, battle, ceremony, weapon, army, war, veil, cavalry, music, outfit, soldier, rifle, dancer, gun.
Perhaps it’s a painting of a group of men on horses in front.