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.