Receiving information from a Czech scientist that worked at Peenemünde, Morávek informed the British on 15 August 1943 about the secret development of the V1 and V2 rockets. Within 48 hours, the British diverted forces from the strategic bombing offensive for Operation Crossbow into the Operation Hydra (1943) that bombed Peenemünde. This bombing was highly successful, delaying considerably the development and utilisation of the rockets V1 and V2.