First Schleswig War

The First Schleswig War was a military conflict in southern Denmark and northern Germany rooted in the Schleswig-Holstein Question, contesting the issue of who should control the mainly German-speaking Duchies of Schleswig, Holstein and Lauenburg. Ultimately, the Danish side proved victorious with the diplomatic support of the great powers.

The conflict is known as the Three Years' War in Denmark. It constitutes a major historical event in the national culture of Denmark. In Germany, the war is called the Schleswig-Holstein War but also as the Schleswig-Holstein Uprising.

Source: Wikipedia