Battle of Dybbøl
During the Second Schleswig War in 1864, the Danish Army withdrew from the traditional fortified defence line, the Dannevirke (after waters and marshes which supported its flanks froze solid in a hard winter), and marched for Dybbøl to find a more defensible position. Although much artillery was abandoned and the evacuation was executed through a snow-laden north gale in winter, the army arrived almost intact. It entrenched itself at the Dybbøl Trenches, which became the scene of the siege and subsequent Battle of Dybbøl (7 April – 18 April 1864). This battle resulted in a Prussian-Austrian victory over Denmark.