 Complete the following phrase:  The 6th Division fought in the Second Schleswig War of 1864, including the key Battle of Dybbøl, or Düppeler Heights. The division then fought in the Austro-Prussian War in 1866, including the Battle of Königgrätz. In the Franco-Prussian War of 1870-71, the division saw action in the battles of Mars-la-Tour, Gravelotte, 