During the week the enemy made a greater number of long-range nightbomber sorties than during any other week of the war. On the 19th/20th. approximately 500 aircraft were employed; this is the highest number recorded in operations on any night against this country. Attacks also showed greater concentration, and on the nights of the 14th/15th, 15th/16th and 19/20th heavy attacks were made on Coventry, London and Birmingham respectively; 350 aircraft attacked Coventry, under ideal weather conditions, and 340 were used against Birmingham.
He decided to attack the railway marshalling yards at Cologne instead and while he was approaching this target his aircraft was suddenly shaken by a succession of violent explosions. The cockpit filled with black fumes and Cheshire lost control of the aircraft, which dived about 2,000 feet, with its fuselage on fire. Cheshire regained control, the fire was extinguished and the Whitley, with a gaping hole in its fuselage, was brought safely back to base after, being in the air for 8 1/2 hours.