42 Halifaxes from 408, 419, 427, and 428 Squadrons were joined by 34 Wellingtons 429, 431, and 432 Squadrons on an attack at Cologne. The crews were over the target at between 16,000 and 21,000 feet, releasing 205,000 lbs of incendiaries and 104,000 lbs of high explosives. According to reports, bombing was accurate and serious damage was caused. Richard Koval (6bombergroup.ca)
653 aircraft - 293 Lancasters, 182 Halifaxes, 89 Wellingtons, 76 Stirlings, 13 Mosquitoes. 30 aircraft - 9.Halifaxes, 8 Lancasters, 8 Wellingtons, 5 Stirlings - lost, 4·6 per cent of the force.
The aiming point for this raid was that part of Cologne situated on the east bank of the Rhine. Much industry was .located there. Pathfinder ground marking was accurately maintained by both the Mosquito Oboe aircraft and the backers-up, allowing the Main Force to carry out another heavy attack on Cologne. 20 industrial premises and 2,200 houses were completely destroyed, 588 people were killed, approximately 1,000were injured and 72,000 bombed out.
.This night saw the first operations of a new German unit, Jagdgeschwader 300 equipped with single-engined fighters using the Wilde Sau (Wild Boar) technique. Ii this, a German pilot used any form of illumination available over a city being bomber - searchlights, target indicators, the glow of fires on the ground - to pick out : bomber for attack. Liaison with the local Flak defenses was supposed to ensure tha the Flak was limited to a certain height above which the Wild Boar fighter was free t, operate. R.A.F. crews were not used to meeting German fighters over a target city and it was some time before the presence of the new danger was realized. The report on this night from 4 bombers that they had been fired on over the target by ot he bombers were almost certainly the result of Wild Boar attacks. The new German unit claimed 12 bombers shot down over Cologne but had to share the 12 available aircraft found to have crashed with the local Flak, who also claimed 12 successes.
source: The Bomber Command War Diaries, Martin Middlebrook and Chris Everitt