9 May – Denmark wins a tactical victory in the Battle of Heligoland but it has no impact on the outcome of the war.
12 May – A general armistice came into effect, Denmark has lost the war.
29 June – In the Battle of Als, the last major engagement of the war, the Prussians secure Als after a night attack masterminded by the Chief of Staff Leonhard Graf von Blumenthal,
3 July – The Battle of Lundby in north-eastern Himmerland results in great Danish losses. It becomes the last battle of the Second Schleswig War.
8 July – The Cabinet of Monrad is succeeded by the Cabinet of Bluhme.
30 October – The Second Schleswig War ends. The Duchies of Schleswig, Holstein and Lauenburg are ceded to Prussia.