"The war to end war" (also "The war to end all wars";[1] originally from the 1914 book The War That Will End War by H. G. Wells) is a term for the First World War of 1914–1918. Originally an idealistic slogan, it is now mainly used sardonically,[2] since not only was the First World War not history's final war, but its aftermath also indirectly contributed to the outbreak of the even more devastating Second World War.