9 April – The Battle of Bov, the first battle of the war, is won by Denmark.
29 April – The Battle at Schleswig: Prussia has now entered the war and the German side has almost three times as many soldiers as Denmark, which has to withdraw to Funen. Jutland is left open to the German troops.
3 July – Slavery is definitively abolished in the Danish West Indies. It is officially confirmed on 22 September.