Vercingetorix before Caesar, 52 BC Henri Paul Motte (1846-1922)

The picture has something of this: people, group, man, cavalry, weapon, many, soldier, military, group together, war, woman, smoke, flame, wear, skirmish, transportation system, city.
Perhaps it’s a painting of a man riding on the back of a horse in front of a group of men standing on either side of a fenced off road.