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I should imagine the air raid wardens by sounding an air raid siren!

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13y ago
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11y ago

nothing, because the peopel didn't know there was a raid

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10y ago

Air-raid Sirens were developed in WW2 to warn of air-raids in Europe. (If you are asking about a specific "blitz," please re-enter your question with more details.)

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14y ago

Sirens.

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Q: What warned people that the raid in the blitz was about to begin?
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