The 13th Division served in the Second Schleswig War against Denmark in 1864, seeing action in the war's major battles: the Battle of Dybbøl (also called the Battle of the Düppeler Heights) and the Battle of Als. The division then fought in the Austro-Prussian War in 1866, where it was part of the Army of the Main ("Main-Armee") and saw action in the engagements against Austria's south German allies, including the siege of the Bavarian fortress at Würzburg. In the Franco-Prussian War of 1870-71, the division fought in several battles and engagements, including the Battle of Borny-Colombey, also called the Battle of Colombey-Nouilly, and the Gravelotte, or Gravelotte-St. Privat, and the Siege of Metz.