The lamps are going out all over Europe. We shall not see them lit again in our lifetime: So said British Foreign Secretary Sir Edward Grey on the eve of the Great War in 1914. The many conflicts that took place around the globe between 1914 & 1939 showed that diplomacy was all too often incapable of arresting military & political ambition, & that the notion of collective security was just a noble idea. World at War: 1914-1939 uses contemporaneous reports & photographs from the Daily Mail archives, including many eyewitness accounts, to show how the conflicts of that period developed, describing the key battles, tactical decisions & turning points that settled the outcome.