raid siren were used during the second world war warning air raids |
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| navigate by keyword : air raid siren world war wwii warning raids bombing imminent anti aircraft shelter alarm alert danger emergency evacuation history military protection safety signal sound 1940s alertness blitz conflict fear historical loud noise precaution security vintage warfare civil defense crisis disaster loudspeaker panic public readiness survival threat |
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| They were triggered when the bombing was imminent and indicated that everyone should go to the nearest anti-aircraft shelter. |
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