The first Allied bombing raid on Berlin during the course of the Second
World War took place on 7 June 1940, when a French naval aircraft
dropped 8 bombs on the German capital, but the first British raid on
German soil took place on the night of 10/11 May 1940, when RAF aircraft
attacked Dortmund.
Initially, Nazi Germany hadn't given much thought about its aerial
defenses. being attacked in its 'own back yard' wasn't something that
was anticipated to be an issue. Germany had been on the offensive from
the beginning of the war and Hitler believed that the Luftwaffe was the
much stronger air force.
In addition, from 1939-1942, the Allied policy of aerial attacks on
German soil was to hit targets with a distinct military purpose, such as
munitions factories, airfields etc. This meant that the Germany military
could focus where they placed their anti-aircraft batteries and had a
very good idea of how many they would need.
However, Germany's defensive capabilities were forced to improve as
Allied raids on towns and cities increased in size and frequency.
Fighter aircraft were included as part of anti-aircraft defenses and
flak units mastered the art of keeping attacking Allied aircraft at a
specific height. This made it more difficult for them to identify their
specific targets, and easier for German fighter aircraft to shoot them
down before they could jettison their bomb loads.
With the Allied tactic of 'area bombing', Germany's anti-aircraft
capabilities became harder to maintain as demand increased. The longer
the war went on, along with the increased Allied bombing raids,
sometimes involving more than 1,000 bomber aircraft, so the worth and
effectiveness of German air-defenses dwindled.
