Battle of Heligoland
1864
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The Battle of Heligoland was fought on 9 May 1864, during the Second Schleswig War, between a Danish squadron led by Commodore Edouard Suenson and a joint Austro-Prussian squadron commanded by the Austrian Commodore Wilhelm von Tegetthoff. Wikipedia
Date: May 9, 1864
Location: Heligoland and German Bight