What is the Danish name of the battle for which Prussian participants were given the Düppel Storm Cross?
Duppel Storm Cross:  The cross was awarded to Prussian participants in the Battle of Dybbøl ("Düppeler Schanzen") which took place on 18 April 1864, during the Second Schleswig War. Battle of Dybbøl: The Battle of Dybbøl (Danish: "Slaget ved Dybbøl" ; German: "Erstürmung der Düppeler Schanzen" ) was the key battle of the Second Schleswig War and occurred on the morning of 18 April 1864 following a siege starting on 7 April.
Slaget ved Dybbøl