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The evacuation of civilians in Britain during the Second World War was designed to defend individuals, especially children, from the risks associated with aerial bombing of cities by moving them to areas thought to be less at risk.
Under the name "Operation Pied Piper", the effort began on 1 September 1939 and officially relocated 1.5 million people. There were further waves of official evacuation and re-evacuation from the south and east coasts in June 1940, when a seaborne invasion was expected, and from affected cities after the Blitz began in September 1940. Official evacuations also took place from the UK to other parts of the British Empire, and many non-official evacuations within and from the UK. Other mass movements of civilians included British citizens arriving from the Channel Islands, and displaced people arriving from continental Europe.