Amid the 1848 revolutions, Schleswig-Holstein leaders established a provisional government in Kiel and moved to seize key military assets, challenging the Danish crown’s authority in the duchies and helping trigger the war.
Danish forces defeated Schleswig-Holstein troops near Flensburg, an early battlefield test that marked the first major engagement of the war.
Prussian-led forces defeated Danish troops near Schleswig (by the Dannevirke area), underscoring the conflict’s escalation as German Confederation support strengthened the insurgents.
A Danish offensive operation in Sundeved forced German federal troops to withdraw, helping Denmark reassert battlefield momentum in late spring 1848.
Danish forces won at Dybbøl, reinforcing their defensive position around Sønderborg and contributing to pressure for a ceasefire later that summer.
Denmark and Prussia agreed to an armistice that created a temporary truce in the war and provoked political controversy in Germany, including unrest connected to the Frankfurt Parliament’s reluctant acceptance.
Denmark formally denounced the armistice, helping set the stage for renewed fighting and a new phase of the conflict.
A major Danish naval assault near Eckernförde ended in defeat, with significant Danish losses and the loss of major vessels—an important reversal at sea during the renewed 1849 fighting.
The fledgling German imperial fleet (Reichsflotte) engaged the Danish navy off Heligoland; the clash ended inconclusively but became the Reichsflotte’s only battle, while the Danish blockade continued.
Denmark’s successful sortie from besieged Fredericia defeated Schleswig-Holstein forces and relieved the siege, making it one of Denmark’s most significant land victories of the war.
Prussia and Denmark signed the Peace of Berlin, ending Prussia’s war with Denmark and formally winding down the German Confederation’s direct military involvement—leaving Schleswig-Holstein increasingly isolated.
At Idstedt/Isted, Danish forces won a major battle against the Schleswig-Holstein army; despite the scale of the victory, fighting continued and the insurgent forces were not immediately destroyed.
Danish forces defeated Schleswig-Holstein troops at Lottorf in what is commonly described as the final battle of the First Schleswig War, as Denmark consolidated control and the conflict moved toward its end in early 1851.
First Schleswig War (1848–1851)
