Battle of Isted Day is observed in Denmark every July 25 to commemorate the Battle of Isted, the last major battle of the First Schleswig War, which occurred on July 25, 1850. This battle took place near the village of Isted, approximately 10 kilometers from Schleswig in present-day Germany, and was fought between the German Confederation and Denmark over control of the duchies of Schleswig and Holstein. Although the Danish forces emerged victorious, they suffered heavier losses, and the battle did not conclude the war, which continued until December 1850. The day is recognized as a military flag-flying day in Denmark, reflecting its significance in the country's military history. The Battle of Isted is considered one of the most important milestones for Denmark, marking a pivotal moment in the conflict that ultimately led to the duchies remaining in a personal union with Denmark.