 In June 1940 the "Luftwaffe" still had no proper night fighter training school.At the end of 1941, the OKL had time to build a night fighter force capable of imposing an intolerable cost on the RAF, but the OKL chose not to do so, perhaps under the illusion the Soviet Union would soon fall and air units then released to the West for air defence.The shock effect of Hamburg on the OKL encouraged greater urgency in producing new tactics and technologies to overcome the British offensive, now the Germans had lost the lead in high-frequency field.