Thomas Eakins, American, 1844-1916 – Mending the Net Philadelphia Museum of Art

The picture has something of this: mammal, people, tree, landscape, cropland, vehicle, outdoors, two, group, daylight, war, cattle, cavalry, livestock, grass, military, herder.
Perhaps it’s a painting of a group of people standing on a hill with a tree in the foreground and sheep grazing on the other side of the hill.