1940 To 1942
Before 1941, Berlin, at 950 kilometres (590 miles) from London, was at the extreme range attainable by the British bombers then available to the RAF. It could be bombed only at night in summer when the days were longer and skies clear—which increased the risk to Allied bombers. The first RAF raid on Berlin took place on the night of 25 August 1940; 95 aircraft were dispatched to bomb Tempelhof Airport near the centre of Berlin and Siemensstadt, of which 81 dropped their bombs in and around Berlin, and while the damage was slight, the psychological effect on Hitler was greater. The bombing raids on Berlin prompted Hitler to order the shift of the Luftwaffe's target from British airfields and air defences to British cities, at a time when the British air defences were critically close to collapse. It has been argued that this action may have saved the British from defeat. In the following two weeks there were a further five raids of a similar size, all nominally precision raids at specific targets, but with the difficulties of navigating at night the bombs that were dropped were widely dispersed. During 1940 there were more raids on Berlin, all of which did little damage. The raids grew more frequent in 1941, but were ineffective in hitting important targets. The head of the Air Staff of the RAF, Sir Charles Portal, justified these raids by saying that to "get four million people out of bed and into the shelters" was worth the losses involved.
The Soviet Union started a bombing campaign on Berlin on 8 August 1941 that extended into early September.
On 7 November 1941 Sir Richard Peirse, head of RAF Bomber Command, launched a large raid on Berlin, sending over 160 bombers to the capital. More than 20 were shot down or crashed, and again little damage was done. This failure led to the dismissal of Peirse and his replacement by Sir Arthur Harris, a man who believed in both the efficacy and necessity of area bombing. Harris said: "The Nazis entered this war under the rather childish delusion that they were going to bomb everyone else, and nobody was going to bomb them. At Rotterdam, London, Warsaw, and half a hundred other places, they put their rather naïve theory into operation. They sowed the wind, and now they are going to reap the whirlwind."
At the same time, new bombers with longer ranges were coming into service, particularly the Avro Lancaster, which became available in large numbers during 1942. During most of 1942, however, Bomber Command's priority was attacking Germany's U-boat ports as part of Britain's effort to win the Battle of the Atlantic. During the whole of 1942 there were only nine air alerts in Berlin, none of them serious. Only in 1943 did Harris have both the means and the opportunity to put his belief in area bombing into practice.
Read more about this topic: Bombing Of Berlin In World War II