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How did World War II damage Cologne?

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Cologne The Hohenzollern rail and pedestrian bridge over the Rhine River, Cologne, Germany, with the city's cathedral in the background.

During World War II, Cologne suffered catastrophic destruction due to 262 air raids. The city was a primary target for Allied strategic bombing, including the first 1,000-bomber raid in history, which occurred on the night of May 30–31, 1942.12

The impact on the city was profound:
* Casualties and Population: The raids resulted in 20,000 casualties, and by the end of the war in March 1945, the city's population had plummeted from 768,352 to 40,000.1
* Infrastructure: The Inner City was almost completely destroyed. Nearly all dwellings in the old town were damaged.31
* Cultural Heritage: The city's historic architecture suffered immensely, with 91 out of 150 churches destroyed. Notable landmarks, including the Cologne Cathedral, sustained severe damage, and many secular medieval buildings—such as the Town Hall, the Gürzenich, and the Overstolzen House—required extensive postwar reconstruction.14

Following the war, Cologne underwent a massive effort of clearance and reconstruction, eventually regaining its status as a major economic and cultural center.1