The Battle of Somme was one of the largest battles of World War I, fought between July 1 and November 18, 1916, primarily on the western front. It is infamous for the staggering number of casualties and was intended as a joint operation by British and French forces to relieve pressure on the French army at Verdun while also breaking through German defenses. The battle marked a significant shift in warfare tactics and highlighted the brutal realities of trench warfare.