The Allied Generals with the officers of staff before Sebastopol Thomas Jones Barker (1815-1882)

The picture has something of this: people, group, many, mammal, cavalry, man, landscape, seated, recreation, vehicle, daylight, herder, military, skirmish, battle, desert, wear, crowd, weapon.
Perhaps it’s a painting of a large group of people in the middle of a field with horses and people on the other side of the field.