Conquest of Siberia by Yermak Vasily Ivanovich Surikov (1848-1916)

The picture has something of this: people, man, group, flame, many, skirmish, smoke, cavalry, military, river, war, wear, saint, weapon.
Perhaps it’s a painting of a group of people on a boat in a body of water with a crowd of people standing on the other side of the boat.