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When was the first aerial bomb dropped during the Second World War on the British mainland?

On 10 May 1940 a single German plane made the first attack on Britain's mainland by dropping bombs near the villages of Petham and Chilham close to Canterbury. There were no casualties or damage done to buildings.

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Source:
Civil defence by Terence O'Brien. - London : HMSO and Longmans, 1955. (History of the Second World War : United Kingdom civil series / edited by Sir Keith Hancock).