Orna Merchant learns how, during World War Two, a desperate Soviet Union created three all-female aerial combat units. The most celebrated of these was the 588th Night Bomber Regiment. Using Polikarpov Po-2 wooden biplanes, as the aviators approached their target they would cut their engines and glide in to drop their bombs. The eerie sight and sound of this – added to the discovery of them having all women crews - led German forces to nickname them ‘Nachthexen’ - the Night Witches.

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