The Battle of the Yser was a significant conflict during World War I, fought from October 16 to November 2, 1914. It took place in the region of Flanders in Belgium, where Allied forces, primarily composed of Belgian and British troops, faced the advancing German army. The battle was marked by heavy fighting and the strategic use of flooding to halt the German advance. The Allies successfully defended their positions along the Yser River, preventing the Germans from capturing key ports like Dunkirk and Calais. This battle was crucial in establishing a stalemate on the Western Front, leading to trench warfare that characterized much of the war.