“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.
“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.
https://en.m.wikipedia.org/wiki/The_war_to_end_war