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

The picture has something of this: people, group, many, war, soldier, battle, weapon, military, skirmish, man, army, battlefield, interaction, gun, vehicle, cavalry, force.
Perhaps it’s a painting of a large group of people standing in front of a body of water with a boat in the foreground and a city in the background.