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A military order of September 7, 1918 contains the first written example of the term D-day. It also contains the first example of another temporal neologism. What is it?




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Answer: H-hour

The Field Order (No. 8, First Army, A.E.F. of September 7, 1918) reads as follow: "The First Army will attack at H-Hour on D-Day with the object of forcing the evacuation of the St. Mihiel salient." The two terms are used to denote the day and hour of an operation when the day and hour have yet to be specified.

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