WWII turning point (1-3)

I think it could be either:

Which length description are you looking for?:

1-3

d-day

'wwii turning point' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for d-day that I've seen before include "June six, nineteen fourty-four" , "Allied landings date" , "Launch date" , "World War Two Normandy landings date" , "Tricky landings" .)

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