World War I, which lasted from 1914 to 1918, featured several significant battles that shaped the course of the conflict. Notable battles included the Battle of the Somme, where over a million soldiers were killed or wounded, and the Battle of Verdun, known for its extreme length and high casualties. These battles exemplified the brutal trench warfare that characterized the war. Another important battle was the Battle of Gallipoli, where Allied forces attempted to secure a sea route to Russia but faced fierce resistance from the Ottoman Empire. The Battle of Tannenberg on the Eastern Front was a decisive victory for Germany against Russia, showcasing the strategic importance of mobility and communication in warfare.