Bombing of Cologne in World War II

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A ruined Cologne in 1945 Koeln 1945.jpg
A ruined Cologne in 1945

The German city of Cologne was bombed in 262 separate air raids [1] by the Allies during World War II, all by the Royal Air Force (RAF). A total of 34,711 long tons of bombs were dropped on the city by the RAF. 20,000 people died during the war in Cologne due to aerial bombardments. [2]

Contents

While air raid alarms had gone off in the winter/spring of 1940 as British bombers passed overhead, the first bombing took place on 12 May 1940. [3] The 30/31 May 1942 attack on Cologne was the first 1,000 bomber raid.

First 1,000 bomber raid

Innenstadt, Cologne in 1945 Cologne 1945 5.jpg
Innenstadt, Cologne in 1945
Official British war art imagining a bombing raid on Cologne. The city's cathedral is clearly visible. It survived the war, despite being hit dozens of times by Allied bombs. Mass bomber raid on Cologne.jpg
Official British war art imagining a bombing raid on Cologne. The city's cathedral is clearly visible. It survived the war, despite being hit dozens of times by Allied bombs.

The first ever 1,000 bomber raid by the RAF was conducted on Cologne on the night of 30/31 May 1942. Codenamed Operation Millennium, the massive raid was launched for two primary reasons:

At this stage of the war Bomber Command only had a regular front line strength of around 400 aircraft, and were in the process of transitioning from the twin engined medium bombers of the pre-war years to the newer more effective four-engined heavy bombers such as the Handley Page Halifax and Avro Lancaster. By using bombers and men from Operational Training Units (OTUs), 250 from RAF Coastal Command and from Flying Training Command, Harris could easily make up the 1,000 aircraft. However, just before the raid took place, the Royal Navy refused to allow the Coastal Command aircraft to take part in the raid. [5] The Admiralty perceived the propaganda justifications too weak an argument against the real and pressing threat of the U-boats in the Battle of the Atlantic. Harris scrambled around and, by crewing 49 more aircraft with pupil pilots and instructors, 1,047 bombers eventually took part in the raid, two and a half times more than any previous raid by the RAF. 58 bombers were from Polish units. [6] In addition to the bombers attacking Cologne, 113 other aircraft on "intruder" raids harassed German night-fighter airfields.

Cologne was not Harris's first choice; he wanted to bomb Hamburg. Poor weather made Hamburg a poor choice; [5] in addition, Harris was advised by Dr. Basil Dickins, a scientist who was section head of RAF's Bomber Command's Operations research, to choose Cologne, which was within GEE range. [7]

RAF bomber H2S radar display from the 30/31 October 1944 Cologne attack with post-attack annotations H2S Display Cologne.jpg
RAF bomber H2S radar display from the 30/31 October 1944 Cologne attack with post-attack annotations

This was the first time that the "bomber stream" tactic was used and most of the tactics used in this raid remained the basis for standard Bomber Command operations for the next two years and some elements remained in use until the end of the war. It was expected that such a large number of bombers flying in a bomber stream through the Kammhuber line would overwhelm the German night fighters' ground-controlled interception system, keeping the number of bombers shot down to an acceptable proportion. The recent introduction of GEE allowed the bombers to fly a given route at a given time and height. The British night bombing campaign had been in operation for some months, and a statistical estimate could be made of the number of bombers likely to be lost to enemy night fighters and flak, and how many would be lost through collisions. Minimising the former demanded a densely packed stream, as the controllers of a night fighter flying a defensive 'box' could only direct a maximum of six potential interceptions per hour, and the flak gunners could not concentrate on all the available targets at once. Earlier in the war four hours had been considered acceptable for a mission; for this raid all the bombers passed over Cologne and bombed in a window of 90 minutes, with the first having arrived at 00:47 of 31 May. It was anticipated that the concentration of bombing over such a short period would overwhelm the Cologne fire brigades and cause conflagrations similar to those inflicted on London by the Luftwaffe during the Blitz.

Hermann Claasen (1946-47). Ruins of St Martin at Cologne old market Truemmer koeln alter markt u gross stmartin194647.jpg
Hermann Claasen (1946–47). Ruins of St Martin at Cologne old market

In the raid, 868 aircraft bombed the main target with 15 aircraft bombing other targets. The total tonnage of bombs dropped was 1,455 tons with two-thirds of that being incendiaries. Two and a half thousand separate fires were started with 1,700 classed by the German fire brigades as "large". The action of fire fighters and the width of the streets stopped the fires combining into a firestorm, but nonetheless most of the damage was done by fire and not directly by the explosive blasts. 3,330 non-residential buildings were destroyed, 2,090 seriously damaged and 7,420 lightly damaged, making a total of 12,840 buildings of which 2,560 were industrial or commercial buildings. Among the buildings classed as totally destroyed were: 7 official administration buildings, 14 public buildings, 7 banks, 9 hospitals, 17 churches, 16 schools, 4 university buildings, 10 postal and railway buildings, 10 buildings of historic interest, 2 newspaper offices, 4 hotels, 2 cinemas and 6 department stores. The only military installation damaged was the flak barracks. The damage to civilian homes, most of them apartments in larger buildings, was considerable: 13,010 destroyed, 6,360 seriously damaged, 22,270 lightly damaged. The devastation was recorded by Hermann Claasen from 1942 until the end of the war, and presented in his exhibition and book of 1947 Singing in the furnace. Cologne – Remains of an old city. [8]

The RAF lost 43 aircraft (German sources claimed 44), [9] 3.9% of the 1,103 bombers sent on the raid; 22 aircraft were lost over or near Cologne, 16 shot down by flak, four by night fighters, two in a collision, and two Bristol Blenheim light bombers lost in attacks on night fighter airfields. A posthumous Victoria Cross was awarded to Flying Officer Leslie Thomas Manser who sacrificed himself so his crew could abandon the aircraft.

Resources committed [10]
No. and type of aircraftNumber of aircraft
No. 1 Group RAF 156 Vickers Wellington medium bombers156
No. 3 Group RAF 134 Wellington
88 Short Stirling heavy bombers
222
No. 4 Group RAF 131 Handley Page Halifax heavy bombers
9 Wellington
7 Armstrong Whitworth Whitley medium bombers
147
No. 5 Group RAF 73 Avro Lancaster heavy bombers
46 Avro Manchester medium bombers
34 Handley Page Hampden medium bombers
153
No. 91 (Operational Training) Group236 Wellington
21 Whitley
257
No. 92 (Operational Training) Group63 Wellington
45 Hampden
108
Flying Training Command4 Wellington4

Timeline

Timeline
Date [nb 1] Bomber forceNotes
17/18 May 1940RAFSix Wellingtons bomb the railway yards. [11]
13/14 February 1942RAF39 aircraft encountered ice and cloud, poor bombing results reported. [12]
13/14 March 1942RAF135 aircraft involved in the raid. The raid killed 62 and injured a further 84. 237 separate fires were started and the RAF estimated the raid to be five times more effective than average of recent raids on Cologne. This is considered to be the first successful GEE led raid. The RAF lost one Avro Manchester. [13]
5/6 April 1942RAF263 aircraft. [14]
22/23 April 1942RAF69 aircraft. [14]
27/28 April 1942RAF97 aircraft. [14]
30/31 May 1942RAF868 aircraft bombed Cologne during the first 1000 bomber raid (1,047 aircraft), [12] laden with over 3,000 tonnes of ordnance.
31 May 1942RAFPhoto reconnaissance by 5 de Havilland Mosquitoes of No. 105 Squadron RAF. [12]
31 May/1 June 1942RAFTwo aircraft. Conditions were cloudy over Cologne so no bombing was undertaken. Both aircraft returned to base. [12]
1 June 1942RAF2 Mosquitoes in a nuisance [nb 2] and diversionary raid. [12] [nb 3]
26 July 1942RAF3 Mosquitoes in a nuisance raid. [12]
10 August 1942RAFSingle Mosquito on a nuisance raid, bombs and returns to base. [15]
25 August 1942RAF4 Mosquitoes to Germany on nuisance raids, one of them to Cologne, three complete their mission and bomb. One lost. [15]
2 September 1942RAF1 Mosquito on a nuisance raid, bombs and returns to base. [12]
2 September 1942RAF2 Mosquitoes on a nuisance raid, bomb through cloud and return to base. [12]
7 September 1942RAF1 Mosquito on a nuisance raid, bomb through cloud and return to base, no record of the bombing on the ground. [12]
15/16 October 1942RAF289 aircraft. [12]
22/23 January 1943RAFThis was the first raid on Cologne using "Oboe" blind bombing radio navigation, two Mosquitoes damaged 55 houses, killing 5 people and 22 injured. This showed that, using electronic aids, a few bombers were able to inflict as much damage as 100-bomber raids in poor weather in the previous years. [12]
2/3 February 1943RAF161 aircraft. [12]
14/15 February 1943RAF243 aircraft. [12]
25/26 February 1943RAF6 Mosquitoes to the Ruhr in a diversionary raid (the main attack was against Nuremberg), 13 people were killed in Cologne [12]
26/27 February 1943RAF427 aircraft. [12]
May 1943RAF [12]
11/12 June 1943RAFOne Mosquito as part of a diversionary raid (the main attack was against Düsseldorf) [12]
13/14 June 1943RAF2 Mosquitoes bombed Cologne one of several nuisance raid. [12]
16/17 June 1943RAF212 aircraft. [12]
17/18 June 1943RAFTwo Mosquitoes bombed Cologne, one of several nuisance raids. [12]
19/20 June 1943RAFSix Mosquitoes to Cologne, Duisburg and Düsseldorf (the main attack was against Le Creusot). [12]
22/23 June 1943RAFFour Mosquitoes as a diversionary raid, (the main attack was against Mülheim). [12]
23/24 June 1943RAFThree Mosquitoes on a nuisance raid. [12]
28/29 June 1943RAF608 aircraft. [12]
2/3 July 1943RAFThree Mosquitoes on a nuisance raid. [16]
3/4 July 1943RAF653 aircraft attacked Cologne's industrial area on the east bank of the Rhine. A new German unit, Jagdgeschwader 300, used the Wilde Sau tactic in single engined fighters for the first time. The German fighters, taking advantage of the illumination from searchlights, target indicator flares and fires claimed that they shot down 12 aircraft, but had to share their claims with the anti-aircraft batteries who also claimed the downings. To avoid friendly fire losses, anti-aircraft batteries restricted the height of their flak and the fighters operated above that pre-agreed ceiling. [16]
5/6 July 1943RAFFour Mosquitoes on a nuisance raid. [16]
6/7 July 1943RAFFour Mosquitoes on a nuisance raid. [16]
7/8 July 1943RAF4 Mosquitoes on a nuisance raid. [16]
8/9 July 1943RAF288 aircraft. [16]
13/14 July 1943RAFTwo Mosquitoes on a diversionary raid drop target indicators (the main raid was on Aachen). [16]
25/26 July 1943RAF3 Mosquitoes on a diversionary raid (the main raid was on Essen). [16]
4/5 August 1943RAF5 Mosquitoes Cologne and Duisburg through cloud. [17]
4/5 August 1943RAF5 Mosquitoes Cologne and Duisburg through cloud, the only sorties of the night. No losses [17]
6/7 August 1943RAF8 Mosquitoes to Cologne and Duisburg, the only sorties over Germany that night. All 8 returned to base [17]
7/8 August 1943RAF4 Mosquitoes in a nuisance raid. [17]
11/12 August 1943RAF8 Mosquitoes in a nuisance raid. [17]
29/20 August 1943RAF4 Mosquitoes equipped with Oboe, with another 4 to Duisburg, in a nuisance raids. One Mosquito lost. [17]
1 September 1943RAF8 Mosquitoes were sent to Cologne and Duisburg. No Mosquitoes lost. [18]
4/5 September 1943RAF8 Mosquitoes were sent to Cologne and Duisburg. No Mosquitoes were lost. [18]
13/14 September 1943RAF5 Mosquitoes equipped with Oboe with another 5 to Duisburg, in a nuisance raids. No Mosquitoes were lost. [18]
18/19 September 1943RAF5 Mosquitoes on a nuisance raid. No Mosquitoes were lost. [18]
24/25 September 1943RAF8 Mosquitoes to Cologne and Düsseldorf on nuisance raids. No Mosquitoes were lost. [18]
26/27 September 1943RAF4 Mosquitoes to Cologne on a nuisance raid. No Mosquitoes were lost. [18]
26/27 September 1943RAF8 Mosquitoes attacked Cologne and Gelsenkirchen on nuisance raids. These were the only Bomber Command sorties of the night. No Mosquitoes were lost. [18]
2/3 October 1943RAF8 Mosquitoes to Cologne and Gelsenkirchen on diversionary raids. The main raid was to Munich. No aircraft lost on the diversionary raids. [19]
3/4 October 1943RAF12 Mosquitoes equipped with Oboe bombed the Knapsack power-station near Cologne. No aircraft lost. [19]
13/14 October 1943RAF4 Mosquitoes to Cologne on a nuisance raid. No Mosquitoes were lost. [19]
20/21 October 1943RAF28 Mosquitoes to Berlin, Cologne, Brauweiler and Emden. 2 Mosquitoes were lost. The main raid of the night was to Leipzig [19]
22 December 1943USAAF VIII Bomber Command Mission 163: 1 B-17 dropped two 2,000-pound (907 kF) general-purpose bombs and 1 Photoflash at 2020 hours; no casualties. [20]
1/2 January 1944RAF1 Mosquito on a diversionary nuisance raid and returned safely to base (main raid to Berlin) [21]
4/5 January 1944RAF2 Mosquitoes on a nuisance raid, both returned to base. [21]
2/3 February 1944RAF3 Mosquitoes on a nuisance raid, all returned to base. [22]
16/17 March 1944RAF8 Mosquitoes on a diversionary nuisance raid, all returned to base (main raid Amiens) [23]
17/18 March 1944RAF28 Mosquitoes bombed Cologne, all returned to base. [23]
21/22 March 1944RAF27 Mosquitoes bombed Cologne, all returned to base. [23]
29/30 March 1944RAF4 Mosquitoes on a diversionary nuisance raid, all returned to base (main raids Vaires, near Paris, and Lyons). [23]
29/30 March 1944RAF34 Mosquitoes on diversions to Aachen, Cologne and Kassel, all returned to base, (but the main raid to Nuremberg resulted in the biggest Bomber Command loss of the war). [23]
April 1944USAAF 303rd Bomb Group Failed deployment of GB-1 Glide Bomb [nb 4]
18/19 July 1944RAF6 Mosquitoes on a diversionary raid, part of a night when the RAF made four substantial attacks and a number of small raids like that on Cologne. They attacked the synthetic oil plants at Wesseling and Scholven/Buer, railway junctions at Aulnoye and Revigny and a flying-bomb launching site at Acque. [24]
14 October 1944 VIII Bomber Command Mission 677: As part of a round-the-clock bombing operation, PFF attacks were made on Cologne marshaling yards at Gereon, Gremberg, and Eifeltor; as well as Euskirchen 35 km outside Cologne. [25]
1944-10-15The 486 BG bombed Cologne. [26]
17 October 1944 8th AF [nb 5] Mission 681: 1,338 bombers and 811 fighters are dispatched on PFF attacks in the Cologne, Germany area; 465 B-17s are dispatched to hit marshalling yards at Cologne/Eifeltor (216) and Cologne/Gremberg (34); the targets of opportunity were Cologne/Kalk marshalling yard (151), 453 B-17s are dispatched to hit marshalling yards at Cologne/Gereon (295) and Cologne/Kalk (142)
12/13 February 1945RAF3 Mosquitoes on H2S radar trials. No aircraft lost. [27]
2 March 1945RAFIn the last RAF raid on Cologne, 858 aircraft bomb in two waves. Only 15 of the 155 aircraft in the second wave dropped their bombs. A daylight raid in good weather, the bombing was "highly destructive". [28]
2 March 1945USAAFA single B-17 bombed Cologne as a target of opportunity. [25]
5 March 1945 9th Tactical U.S. Army Air Force fighters dropped leaflets in the Cologne-Bonn area. [25]
6 March 1945American troops captured Cologne. [12]

See also

Notes

Notes
  1. Dates such as 5/6 April indicate a night raid, the mission starting on the first date and ending the following day
  2. Nuisance raids forced the population into air raid shelters and activated other defence measures at little cost to the RAF.
  3. Sending bombers to several different locations was intended to confuse the German defences and so helped to make it more difficult for the defenders to direct fighters onto the main attack.
  4. "[The GB-1 Glide Bomb] was made from a M34-2000lb bomb fixed to a 12-foot span glider unit and attached to a B-17 underwing shackle. Two Glide bombs could be carried per plane. Essentially free fall, the bomb had a stabilizing device that allowed control of direction. The bomb proved to be unreliable on the only occasion it was used on Cologne in April 1944." "Bombs". Archived from the original on 6 February 2012. Retrieved 15 February 2012.
  5. The VIII Bomber Command had been redesignated as the US Eight Air Force.
Citations
  1. Stadtlandschaften versus Hochstadt at www.koelnarchitektur.de "Internet portal for the architecture of Cologne". (In German).
  2. "bomber command | mines laid | flight august | 1945 | 1571 | Flight Archive". www.flightglobal.com. Archived from the original on 10 January 2015.
  3. "Kriegserinnerungen 1940". Archived from the original on 3 December 2012. Retrieved 1 May 2009.[ permanent dead link ]
  4. Bishop, Patrick (1 October 2012). Wings: The RAF at War, 1912–2012. Atlantic Books Ltd. p. 24. ISBN   978-1-84887-892-1.Terry Copp (September 1996), The Bomber Command Offensive: Army, Part 11 , retrieved 9 November 2016, Mr Justice Singleton concluded that Germany would not be able to "stand 12 or 18 months' continued, intensified and increased bombing..."
  5. 1 2 "The Thousand Bomber raids, 30/31 May (Cologne) to 17 August 1942". 2005. Archived from the original on 6 July 2007.
  6. Hodyra, Piotr (2016). 301 Dywizjon Bombowy 1940–1943 (in Polish). Warsaw: Oficyna Wydawnicza Alma-Press. p. 67. ISBN   978-83-7020-664-2.
  7. Wakelam, Randall Thomas (2009). The Science of Bombing: Operational Research in RAF Bomber Command. U of Toronto P. p. 86. ISBN   9781442693432.
  8. Claasen, Hermann; Hoyer, Franz A (1949), Gesang im feuerofen : Köln; überreste einer alten deutschen stadt ([2. aufl.] ed.), L. Schwann
  9. Winkelnkemper, Toni. "The Attack on Cologne". Der Großangriff auf Köln. calvin.edu. Retrieved 20 March 2009.
  10. Facon, Patrick (May 2012), "Opération Millénium", Le Fana de l'Aviation (in French), no. 510, p. 43, ISSN   0757-4169
  11. "Campaign Diary The Battle of France (May–June 1940)". 2005. Archived from the original on 6 July 2007.
  12. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 Campaign Diary 2005
    1940: The Battle of France (May–June 1940) July–December The Battle of Britain (June–October 1940)
    1941: January–April May–August September- December
    1942: January, February, March, April, May, June, July, August, September, October, November, December
    1943: January, February, March, April, May, June, July, August, September, October, December
    1944: April, July, September, October, November 1944, December 1944
  13. "March 1942". Bomber Command 60th Anniversary. 2005. Archived from the original on 6 July 2007.
  14. 1 2 3 RAF Bomber Command Campaign Diary April 1942,
  15. 1 2 Campaign Diary August 1942
  16. 1 2 3 4 5 6 7 8 "Campaign Diary: July 1943". Bomber Command 60th Anniversary. 2005. Archived from the original on 6 July 2007.
  17. 1 2 3 4 5 6 "Campaign Diary: August 1943". Bomber Command 60th Anniversary. Archived from the original on 6 July 2007. Retrieved 18 July 2008.
  18. 1 2 3 4 5 6 7 "Campaign Diary September 1943", Bomber Command 60th Anniversary, archived from the original on 6 July 2007, retrieved 18 July 2008
  19. 1 2 3 4 "Campaign Diary: October 1943". Bomber Command 60th Anniversary. Archived from the original on 6 July 2007. Retrieved 18 July 2008.
  20. USAF History Publications, archived from the original on 18 November 2009, The Army Air Forces in World War II: Combat Chronology (pdf) Archived 10 September 2008 at the Wayback Machine , (December 1945 (html)). Accessed 21 July 2008
  21. 1 2 "Campaign Diary January 1944", Bomber Command 60th Anniversary, archived from the original on 6 July 2007
  22. "Campaign Diary February 1944", Bomber Command 60th Anniversary, archived from the original on 6 July 2007
  23. 1 2 3 4 5 "Campaign Diary March 1944", Bomber Command 60th Anniversary, archived from the original on 6 July 2007
  24. "Campaign Diary July 1944", Bomber Command 60th Anniversary, archived from the original on 6 July 2007
  25. 1 2 3 McKillop, Jack. "8th Air Force 1944 Chronicles". airwarweb.net. Retrieved 27 January 2009.
    1944: October, November, December
    1945: January, February, March
  26. "Missions 51-100".
  27. "Campaign Diary February 1945", Bomber Command 60th Anniversary, archived from the original on 6 July 2007
  28. "Campaign Diary March 1945". Bomber Command 60th Anniversary. Archived from the original on 6 July 2007.

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References