The Battle of Gravelotte was a Prussian victory in the Franco-Prussian War on the 18th of August 1870; the battle took place on a ridge near Gravelotte and although the Prussians gained an important strategic victory, isolating General Francois Bazaine in Metz, it cost them over 20,000 casualties, compared to French losses of around 13,000. The victory left the bulk of the Prussian forces free to concentrate upon MarshalMarie MacMahon's army which they destroyed at Sedan. Research Battle of Gravelotte