On 30 May 1942, the night sky was filled with the drone of 1,000 bombers on their way to ignite Cologne. What led to the unleashing of this awesome destructive force, and what were the real results of the area bombing of enemy cities? With the voices of historians Max Hastings and Noble Frankland , readings from the diary of Flying Officer Warrender and archive material.
Producers Dilly Barlow and Mark Burman