The 1914 Battle of the Yser (also known as the First Battle of Ypres) was a major battle of World War I fought in Belgium between German and Allied forces. The battle was fought along the Yser River and lasted from October 19 to November 22, 1914. The Allies, led by the French, were victorious in the battle, which was part of the larger Battle of the Marne. The Battle of the Marne was a major turning point in World War I, as it marked the end of the German advance into France and the beginning of the Allied counter-offensive.