WWI Battle River refers to two major battles that took place during World War I: the Battle of the Somme and the Battle of the Yser. The Battle of the Somme was fought between the French and British forces against the German Empire in northern France from July to November 1916. It was one of the largest battles of the war, with more than 1 million casualties on both sides. The Battle of the Yser was fought between the Belgian and French forces against the German Empire in October 1914. It was a decisive victory for the Allies, as it prevented the Germans from advancing further into Belgium.