Battle of Heligoland

Date: May 9, 1864 • Location: Helgoland, Germany

Second Schleswig War: The Battle of Heligoland (depicted), the last naval engagement fought by squadrons of wooden ships, took place between the Danish and Austro-Prussian fleets.

The Second Schleswig War or German-Danish War, also sometimes known as the Dano-Prussian War or Prusso-Danish War, was the second military conflict over the Schleswig–Holstein question of the 19th century. The war began on 1 February 1864, when Prussian and Austrian forces crossed the border into the Danish fief Schleswig. Denmark fought troops of the Kingdom of Prussia and the Austrian Empire representing the German Confederation.