 The "Luftwaffe" dispatched 213 night fighters once the British bombers made landfall over Denmark, 158 conventional twin-engined aircraft and 55 single-engined "Wilde Sau" (Wild Boar) Bf 109 and Fw 190 fighters.In 1943, Joseph Goebbels wrote of a delay of six to eight weeks and the United States Strategic Bombing Survey (1945) called the raid "not effective", Thiel and Walther were killed when they were buried in one of the [air-raid] trenches but the wind tunnel and telemetry block were untouched.In volume II of "The Strategic Air Offensive against Germany" (1961) part of the official "History of the Second World War", Webster and Frankland wrote that Dornberger thought that the bombing delayed the A4 (V2) project by four to six weeks, which had been followed by many later accounts but that this was anecdotal.