The focus of air operations changed to destroying the docks and factories in the centre of London. The change in strategy has been described as militarily controversial. The decision certainly relieved the pressure on Fighter Command, but wartime records and post-war analysis has shown that Fighter Command was not on the verge of collapse as assumed by German intelligence. The consequences for "Luftwaffe" airmen were severe on 15 September 1940. German aviators met a prepared enemy and crew losses were seven times that of the British. Furthermore, Fighter Command did not commit its reserve during the main attacks as the German command predicted.