London, Pact of, an agreement entered into on September 5, 1914, shortly after the outbreak of World War I. The governments of France, Great Britain, and Russia pledged that none of them would separately make peace. They also agreed that all should demand the same peace terms. Japan signed the agreement in October, 1915, and Italy signed it a month later.
World War I, also known as the Great War, left Germany and other countries humiliated and angry. Germany viewed the armistice that ended World War I as a truce, rather than a surrender. This view was ignored. Learn about events that led to World War II.
World War I was the great armed conflict of 191418. Until World War II, it was often called the Great War because it was the most destructive and widespread war the world had ever seen.