The Execution of the Emperor Maximilian Édouard Manet (1832-1883)

The picture has something of this: people, military, group, wear, man, uniform, many, war, group together, soldier, weapon, army, woman, outfit, administration, military uniform, vehicle, battle, education.
Perhaps it’s a painting of a group of men standing next to each other in front of a crowd of people with a flag in the middle of the picture.