The Hall of Remembrance ©Jwh at Wikipedia Luxembourg
It is mid-August 1870 and Napoleon III has declared war on Prussia. Moselle is set to be the scene of three bloody battles, including the Battle of Gravelotte.
Resource page: Musée de la Guerre de 1870 et de l'Annexion
The Battle of Gravelotte (to the Germans) or Saint-Privat (to the French) took place on 18 August 1870, west of Metz. It paved the way for the French army’s capitulation and Napoleon III’s surrender, on 2 September 1870, at Sedan.