For 10 points, name this decisive battle of the Franco-Prussian War.
This battle resulted from an attempt to relieve a besieged army that had been defeated in the Battle of Gravelotte, Marshal Bazaine's Army of the Rhine. Although the winning side used inferior needle guns, this battle was decided by the superiority of Krupp field artillery, which would later be used to besiege Paris. In this battle, the Third Army and Meuse Army encircled the Army of Chalons. Helmuth von Moltke defeated and captured Napoleon III, leading to the collapse of the Second French Empire. For 10 points, name this decisive battle of the Franco-Prussian War.
This battle resulted from an attempt to relieve a besieged army that had been defeated in the Battle of Gravelotte, Marshal Bazaine's Army of the Rhine.
Battle of {Sedan}