British Intelligence were also receiving information from an insider at Peenemünde before the raid. This is what led to the overflights by PR aircraft.
The discovery that Peenemunde was the centre of German rocketry and missile experiments was made by accident as much by intention. The British knew the Germans had been developing rockets; Polish intelligence had reported 'flying torpedoes', and at Peenemunde itself strange earthworks were photographed in 1942, although their purpose was unknown. Peenemunde was initially thought to be connected to explosives and fuel production, but it was on a PR flight to photograph the railway yards at Stettin that had been on the receiving end of bombing in late April 1943 that the PR Mossie crew left their cameras running as they skirted the north coast of Germany, unknowingly capturing a cylindrical object emerging from a building whilst overflying Peenemunde. In the next frame it was gone. In mid May 1943 a PR sortie over Peenemunde revealed more of these cylindrical objects, which the interpreters at Medmenham correctly deduced were rockets.
It seems more people were killed/lost while trying to stop the V-2 programme than the rocket actually killed.
And if Peenemunde had not been attacked then there would have been even more rockets and larger losses of life on the receiving end of them.
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