 parts and sub-assembly fabrication and final assembly manufacturing facilities; Luftwaffe training and logistics could have otherwise sustained. Further, in going for targets they knew the Germans must defend, the American escort fighters were able to inflict crippling losses on the Luftwaffe's fighter force. However it should be pointed out that the RAF also made a great contribution to the oil offensive as its abilities to attack precision targets had greatly improved- by mid 1944 it was mounting huge bombing raids in daylight too.
Albert Speer, Hitler's Minister of Armaments noted that the larger British bombs did much more damage and so made repair more difficult, and sometimes impossible. Shortly after the war's end, Speer was unequivocal about the effect of this:
In terms of overall production decrease resulting from the RAF area attacks, the US survey, based upon limited research, found that in 1943 it amounted to 9% and in 1944 to 17%. Relying on US gathered statistics the British survey found that actual arms production decreases were a mere 3% for 1943, and 1% for 1944. However they did find decreases of 46.5% and 39% in the second half of 1943 and 1944 respectively in the metal processing industries. These losses resulted from the devastating series of raids the Command launched on the Ruhr Valley at these times.
This apparent lack of success is accounted for in several ways. The German industrial economy was so strong, its industrial bases so widely spread, that it was a hopeless task to try and crush it by area bombing. Further, up until 1943 it is undoubtedly the case that Germany was not fully mobilised for war, Speer remarked that single shift factory working was commonplace, and so there was plenty of slack in the system. It has been argued that the RAF campaign placed a limit on German arms production. This may be true but it is also the case that the German forces did not run out of arms and ammunition and that it was manpower that was a key limiting factor, as well as the destruction of transport facilities and the fuel to move.
Having dealt with the negative side of the case it is now time to put the positive. The greatest contribution to winning the war made by Bomber Command was in the huge diversion of German resources into defending the homeland; this was very considerable indeed. By January 1943 some 1,000 Luftwaffe night fighters were committed to the defence of the Reich mostly twin engined Me 110 and Ju 88. Most critically, by September 1943, 8,876 of the deadly, dual purpose 88mm guns were also defending the homeland with a further 25,000 light flak guns 20/37mm. The 88mm gun was an effective AA weapon, it was a deadly destroyer of tanks and lethal against advancing infantry. These weapons would have done much to augment German anti-tank defences on the Russian front.
To man these weapons the flak regiments in Germany required some 90,000 fit personnel, and a further 1 million were deployed in clearing up and repairing the vast bomb damage caused by the RAF attacks. To put this into perspective General Erwin Rommel's German forces defending Normandy in 1944 comprised 50,000, and their resistance caused the Western Allies grave problems.
This diversion to defensive purposes of German arms and manpower was an enormous contribution made by RAF Bomber Command to winning the war. By 1944 the bombing offensive was costing Germany 30% of all artillery production, 20% of heavy shells, 33% of the output of the optical industry for sights and aiming devices and 50% of the country's electro-technical output which had to be diverted to the anti-aircraft role.
From the British perspective it should be noted that the RAF offensive made a great contribution in sustaining morale during the dark days of the war, especially during the bleak winter of 1941-42. It was the only means that Britain possessed of taking the war directly to the enemy at that time.
The first jet bomber was the English Electric Canberra light bomber, some of which remained in RAF service up to 2006 as photo reconnaissance aircraft. Th