Dioramas were popular in France during the 1870s and 1880s, and a popular diorama subject was battle scenes. One such diorama was the Panorama of Rézonville, painted in the early 1880s by the team of Édouard Detaille (1848-1912), the project leader, and Alphonse de Neuville (1835-1885), two of France's leading painters of military subjects. Events at Rézonville were selected because the French army acquitted itself better there than in most battles of the 1870 Franco-Prussian War.
I consider Neuville the better painter of the two, and wrote about him here. Regardless of their merits, the artists were faced with the task of covering an immense amount of canvas featuring many figures and objects in a limited amount of time. The inevitable result was that everything had to be dashed off with a loss of artistic merit compared to their regular easel paintings.
Once the display period for the diorama ended, parts of it were cut off and preserved. You will find a few segments in the Musée de l'Armée in Paris, near Napoléon's Tomb. Below are some snapshots I took of them while visiting the museum recently.