According to economic historian Adam Tooze, in his book The Wages of Destruction: The Making and Breaking of the Nazi Economy, a turning point in the bomber offensive was reached in March 1943, during the Battle of the Ruhr. Over five months 34,000 tons of bombs were dropped. Following the raids, steel production fell by 200,000 tons, making a shortfall of 400,000 tons. Speer acknowledged that the RAF were hitting the right targets, and raids severely disrupted his plans to increase production to meet increasing attritional needs. Between July 1943 and March 1944 there were no further increases in the output of aircraft.[145]
The bombing of Hamburg in 1943 also produced impressive results. Tiger tank production, and the manufacture of 88mm guns, the most potent dual-purpose artillery piece in the Wehrmacht was "set back for months". On top of this, some 62 percent of the population was dehoused causing more difficulties. However, RAF Bomber Command allowed itself to be distracted by Harris' desire for a war winning blow, and attempted the fruitless missions to destroy Berlin and end the war by spring, 1944.[146]
In October 1943, Harris urged the government to be honest with the public regarding the purpose of the bombing campaign. To Harris, his complete success at Hamburg confirmed the validity and necessity of his methods, and he urged that:
By contrast, the United States Strategic Bombing Survey found attacks on waterways, beginning 23 September with strikes against the Dortmund-Ems Canal and Mittelland Canal, produced tremendous traffic problems on the Rhine River. It had immediate impacts on shipments of goods, and especially coal deliveries, upon which Germany's economy depended; with no more additional effort, by February 1945, rail transport (which competed for coal) had seen its shipments cut by more than half, and by March, "except in limited areas, the coal supply had been eliminated."[150]