September 15th. . . . . . . . . .

Originally posted by Vets Dottir
September 15th in History
1915: Tanks used for the first time, by the British in the Somme

(it's one eventof Sept. 15 in history!)

Good try, wrong war, wrong arm of service.
Try Sept 15th 1940.

Oh alright, here's another clue and a real give-away:
"Never before in the field of human conflict has so much. . . . . ."

R.