On 27 June 1943, Luftwaffe officer Major Hajo Herrmann proposed an experimental doctrine to increase the use of free-ranging day fighters (and to a lesser extent night fighters) at night to counter the increasingly destructive Allied attacks.
On 27 June 1943, Luftwaffe officer Major Hajo Herrmann proposed an experimental doctrine to change the German approach on countering the Allied bombing attacks in the night. This new tactic envisaged to increase the use of free-ranging day fighters (and to a lesser extent night fighters) at night to counter the increasingly destructive Allied attacks.