I was wondering whether it might be a WW I scene, as you say, the uniforms seem outdated by that time, and Bouligny was getting old. But it's perhaps more likely that he'd seen Waterhouse's Eulalia.Hi, dear, nice idea, but the soldier fights during the "battle of the Marne" 1914-7,8,9 september which saved France. You were fooled because the French uniform ("garance" blue, red trousers) was the same as in 1870 at the start of the war and was quickly abandoned because it turned our men into ideal targets.
I have a story happening during this battle -)))