Battle of Mysunde Day is observed in Denmark every February 2, commemorating the first battle of the Second Schleswig War, which took place in 1864. This day celebrates the successful defense of Mysunde, a small fishing village on the southern coast of the Schlei, where Danish forces, despite being outnumbered 4 to 1, managed to repel a Prusso-Austrian advance. The battle is significant in Danish military history, as it boosted the morale of Danish troops and the general public, even though Denmark ultimately lost the war and renounced its claims to the duchies of Schleswig and Holstein. The anniversary is recognized as one of Denmark's official flag-flying days, highlighting its importance in the nation's military heritage.