St George and the Dragon (detail) Vittore Carpaccio (c.1465-1526)

The picture has something of this: cavalry, people, veil, sword, knight, man, two, mammal, seated, armor, skirmish, warrior, war, military.
Perhaps it’s a painting of a man riding on the back of a brown horse in front of a painting of a man with a sword on the back of a horse.