German submarine U-804

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Nazi Germany
Name: U-804
Ordered: 7 December 1940[1]
Builder: Deutsche Schiff- und Maschinenbau AG Seebeckwerft, Bremerhaven[1]
Laid down: 1 December 1942[1]
Launched: 31 July 1943[1]
Commissioned: 4 December 1943[1]
Fate: Sunk 9 April 1945 in the Skagerrak west of Göteborg, Sweden by rockets from RAF Mosquito aircraft (Sqdn 143 & 235). 55 dead (all hands lost).[2]
General characteristics [3]
Class & type: Type IXC/40 submarine
  • 1,144 t (1,126 long tons) surfaced
  • 1,257 t (1,237 long tons) submerged
Beam: 6.86 m (22 ft 6 in) o/a 4.44 m (14 ft 7 in) pressure hull
Height: 9.60 m (31 ft 6 in)
Draft: 4.67 m (15 ft 4 in)
Installed power:
  • 4,400 PS (3,200 kW; 4,300 bhp) (diesels)
  • 1,000 PS (740 kW; 990 shp) (electric)
  • 18.3 knots (33.9 km/h; 21.1 mph) surfaced
  • 7.3 knots (13.5 km/h; 8.4 mph) submerged
  • 13,850 nmi (25,650 km; 15,940 mi) at 10 knots (19 km/h; 12 mph) surfaced
  • 63 nmi (117 km; 72 mi) at 4 knots (7.4 km/h; 4.6 mph) submerged
Test depth: 230 m (750 ft)
Complement: 4 officers, 44 enlisted
Service record
Part of:
  • 1st patrol: 19 June - 12 October 1944
  • 2nd patrol: 4–9 April 1945
Victories: 1

German submarine U-804 was a Type IXC/41 U-boat of Nazi Germany's Kriegsmarine during World War II. U-804 was ordered on 7 December 1940, and was laid down on 1 December 1942 at Deutsche Schiff- und Maschinenbau AG Seebeckwerft, Bremerhaven as yard number 362. She was launched on 1 April 1943 and commissioned under the command of Oberleutnant zur See der Reserve Herbert Meyer (Crew III/37) on 4 December of that year.[2]


German Type IXC/40 submariness were slightly larger than the original Type IXCs. U-804 had a displacement of 1,144 tonnes (1,126 long tons) when at the surface and 1,257 tonnes (1,237 long tons) while submerged.[4] The U-boat had a total length of 76.76 m (251 ft 10 in), a pressure hull length of 58.75 m (192 ft 9 in), a beam of 6.86 m (22 ft 6 in), a height of 9.60 m (31 ft 6 in), and a draught of 4.67 m (15 ft 4 in). The submarine was powered by two MAN M 9 V 40/46 supercharged four-stroke, nine-cylinder diesel engines producing a total of 4,400 metric horsepower (3,240 kW; 4,340 shp) for use while surfaced, two Siemens-Schuckert 2 GU 345/34 double-acting electric motors producing a total of 1,000 shaft horsepower (1,010 PS; 750 kW) for use while submerged. She had two shafts and two 1.92 m (6 ft) propellers. The boat was capable of operating at depths of up to 230 metres (750 ft).[5]

The submarine had a maximum surface speed of 18.3 knots (33.9 km/h; 21.1 mph) and a maximum submerged speed of 7.3 knots (13.5 km/h; 8.4 mph).[4] When submerged, it could operate for 63 nautical miles (117 km; 72 mi) at 4 knots (7.4 km/h; 4.6 mph); when surfaced, she could travel 13,850 nautical miles (25,650 km; 15,940 mi) at 10 knots (19 km/h; 12 mph). U-804 was fitted with six 53.3 cm (21 in) torpedo tubes (four fitted at the bow and two at the stern), 22 torpedoes, one 10.5 cm (4.13 in) SK C/32 naval gun, 180 rounds, and a 3.7 cm (1.5 in) as well as a 2 cm (0.79 in) anti-aircraft gun. The boat had a complement of forty-eight.[4]

Service history[edit]


U-804 began training exercises with the 4th U-boat Flotilla on 4 December 1943, and finished her sea trials on 30 June 1944. On 16 June 1944, U-804 was attacked by a Norwegian Mosquito aircraft from No. 333 Squadron RAF, but succeeded in shooting down its attacker at the cost of eight crew members wounded; only minor damage was inflicted on the submarine. The two-man crew of the Mosquito was picked up by U-1000 on 18 June, and taken to occupied Norway.[2]

First patrol[edit]

U-804 began her first war patrol on 19 June 1944 (while still undergoing training) with the 10th U-boat Flotilla. She left Bergen and headed into the North Sea, passing north of the British Isles into the North Atlantic, where she remained for 116 days. On 2 August, during a special hunt for several submarines known to be transmitting weather information from stations in the central and north Atlantic (of which effort U-804 was a part), two American destroyer escorts, Fiske and Douglas L. Howard, were detached from the task group to investigate the whereabouts of U-804, which both had made contact with. Upon sighting the destroyers, the U-boat quickly dived, but the two escorts detected her on their sonar and began their attack approach. Suddenly, USS Fiske was torpedoed on her starboard side by U-804, and within 10 minutes, she broke in two. Thirty-three of her men were killed and 50 were wounded, but all the survivors were rescued by USS Farquhar. Amidst the confusion following the sinking of USS Fiske, U-804 slipped away and returned to her patrol.[6][7]

Second patrol[edit]

On 12 October 1944, U-804 returned to the port of Flensburg after 116 days at sea. Five days later she left Flensburg for Kiel, where she remained until 4 April 1945 before leaving for occupied Norway. While en route in company with another of the flotilla's boats, U-1065, the two submarines were detected and attacked in the Skagerrak strait on 9 April 1945 by over 30 Mosquito aircraft from three Royal Air Force squadrons based at Banff. U-1065 succeeded in shooting down one of the attacking aircraft before being hit by several rockets fired by 10 Mosquitos from 143 and 235 Squadrons; she exploded and sank with the loss of her crew of 45 men.


U-804 suffered the same fate - after being hit by rockets from the attacking Mosquitos she also exploded and sank at 57°58′N 11°15′E / 57.967°N 11.250°E / 57.967; 11.250Coordinates: 57°58′N 11°15′E / 57.967°N 11.250°E / 57.967; 11.250, with no survivors from her crew of 55 men.[2][6][8]

Summary of raiding career[edit]

Date Ship Nationality Tonnage Fate[9]
2 August 1944 USS Fiske  United States Navy 1,300 Sunk


  1. ^ a b c d e "U-804 Type IXC/40". Retrieved 3 March 2010. [dead link]
  2. ^ a b c d Helgason, Guðmundur. "The Type IXC/40 boat U-804". German U-boats of WWII - Retrieved 3 March 2010. 
  3. ^ Gröner 1985, pp. 105-7.
  4. ^ a b c Gröner 1985, p. 105.
  5. ^ Gröner 1985, pp. 105-106.
  6. ^ a b Helgason, Guðmundur. "Patrol info for U-804 (first patrol)". German U-boats of WWII - Retrieved 5 March 2010.  Cite error: Invalid <ref> tag; name "1Patrol" defined multiple times with different content (see the help page).
  7. ^ Helgason, Guðmundur. "USS Fiske (DE 143)". German U-boats of WWII - Retrieved 5 March 2010. 
  8. ^ Busch & Röll 1999, p. 336.
  9. ^ Helgason, Guðmundur. "Ships hit by U-804". German U-boats of WWII - Retrieved 12 February 2014. 


  • Busch, Rainer; Röll, Hans-Joachim (1999). Deutsche U-Boot-Verluste von September 1939 bis Mai 1945. Der U-Boot-Krieg (in German) IV (Hamburg, Berlin, Bonn: Mittler). ISBN 3-8132-0514-2. 
  • Gröner, Erich (1985). U-Boote, Hilfskreuzer, Minenschiffe, Netzleger, Sperrbrecher. Die deutschen Kriegsschiffe 1815-1945 (in German) III (Koblenz: Bernard & Graefe). ISBN 3-7637-4802-4. 

External links[edit]