<a href="https://en.wikipedia.org/wiki/Second_Schleswig_War" id="mwRw" rel="mw:WikiLink" title="Second Schleswig War">Second Schleswig War</a>: The Danish navy defeats the <a href="https://en.wikipedia.org/wiki/Austrian_Empire" id="mwSA" rel="mw:WikiLink" title="Austrian Empire">Austrian</a> and <a href="https://en.wikipedia.org/wiki/Kingdom_of_Prussia" id="mwSQ" rel="mw:WikiLink" title="Kingdom of Prussia">Prussian</a> fleets in the <a href="https://en.wikipedia.org/wiki/Battle_of_Heligoland_(1864)" id="mwSg" rel="mw:WikiLink" title="Battle of Heligoland (1864)">Battle of Heligoland</a>.