The 15th Division fought in the Austro-Prussian War in 1866, seeing action in the Battle of Königgrätz. In the Franco-Prussian War of 1870-71, the division fought in the Battle of Gravelotte (also called the Battle of Gravelotte-St. Privat) and the Siege of Metz, and then in the battles of Amiens, Hallue, Bapaume, and St. Quentin.