Long before the Ruhr dams raid, Operation 'Chastise,' took place on 16-17 May 1943, the Sorpe dam - six miles south-west of the Mohne - had been identified as a critical target for RAF Bomber Command. However, it did not feature prominently in arguments for use of Barnes Wallis's 'bouncing bomb! Nor did it appear in the film The Dam Busters, so its significance has been largely unrecognised. Albert Speer, Reich minister for armaments and war production in May 1943, believed this a grave error.
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