Post-war discussion of whether or not the attacks were justified has led to the bombing becoming one of the moral causes célèbres of the war. A 1953 United States Air Force report defended the operation as the justified bombing of a military and industrial target, which was a major rail transport and communication centre, housing 110 factories and 50,000 workers in support of the German war effort. Several researchers have claimed that not all of the communications infrastructure, such as the bridges, were targeted, nor were the extensive industrial areas outside the city centre. Critics of the bombing argue that Dresden—sometimes referred to as "Florence on the Elbe" (Elbflorenz)—was a cultural landmark of little or no military significance, and that the attacks were indiscriminate area b