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Sep. 09, 1955 - ''Atomic Explosion'' During Army Exercise: A simulated atomic explosion today took place on Salisbury Plain during the three-day exercise ''Ethan Down'', for the 43 (Wessex) Infantry Division (TA). The aim of the exercise is to practice 43 Division, under conditions of nuclear warfare in the occupation of a defensive position and in withdrawal to another defensive position. Photo shows The scene on Salisbury Plain today - during the simulated atomic explosion. (Credit Image: © Keystone Pictures USA/