Birmingham's industrial importance in World War II led to heavy and destructive bombing raids during the Birmingham Blitz. This claimed many lives and many buildings too, but the planned destruction that took place in post-war Birmingham was also extensive. The Public Works Department of Birmingham City Council established a city engineer and a city architect position within the department to aid the design and construction of new housing and public facilities in the city. Therefore, Sir Herbert Manzoni, City Engineer and Surveyor of Birmingham from 1935 until 1963, became profoundly influential in changing the city. His view was "there is little of real worth in our architecture", and in any case, conservation of old buildings was merely sentimental. At the end of war, Birmingham again began to expand and reached a peak in its population in 1951. This produced a demand for new housing to replace that lost in the bombing raids over Birmingham upon the housing needed to meet the requirements for the growing population. As well as this, the increased use of public facilities encouraged their reconstruction and improvement by the city council.