German submarine U-4 (1935)

U-1, the first Type II boat
History
Nazi Germany
Name	U-4
Ordered	2 February 1935
Builder	Deutsche Werke, Kiel
Cost	1,500,000 Reichsmark
Yard number	239
Laid down	11 February 1935
Launched	31 July 1935
Commissioned	17 August 1935
Fate	Stricken 1 August 1944, Gotenhafen, scrapped in 1945
General characteristics
Class and type	Type IIA coastal submarine
Displacement	254 t (250 long tons) surfaced 303 t (298 long tons) submerged 381 t (375 long tons) total
Length	40.90 m (134 ft 2 in) (o/a) 27.80 m (91 ft 2 in) (pressure hull)
Beam	4.08 m (13 ft 5 in) (o/a) 4.00 m (13 ft 1 in) (pressure hull)
Height	8.60 m (28 ft 3 in)
Draught	3.83 m (12 ft 7 in)
Installed power	700 PS (510 kW; 690 shp) (diesels) 360 PS (260 kW; 360 shp) (electric)
Propulsion	2 × propeller shafts 2 × 0.85 m (2 ft 9 in) three-bladed propellers 2 × diesel engines 2 × double-acting electric motors
Speed	13 knots (24 km/h; 15 mph) surfaced 6.9 knots (12.8 km/h; 7.9 mph) submerged
Range	1,050 nmi (1,940 km; 1,210 mi) at 12 knots (22 km/h; 14 mph) surfaced 35 nmi (65 km; 40 mi) at 4 knots (7.4 km/h; 4.6 mph) submerged
Test depth	80 m (260 ft)
Complement	3 officers, 22 men
Armament	3 × 53.3 cm (21 in) torpedo tubes 5 × torpedoes or up to 12 TMA or 18 TMB mines 1 × 2 cm (0.79 in) C/30 anti-aircraft gun
Service record
Part of:	U-boat School Flotilla 1 August 1935 – 1 February 1940 1 March – 1 April 1940 1 May – 30 June 1940 21st U-boat Flotilla 1 July 1940 – 31 July 1944
Identification codes:	M 13 167
Commanders:	Oblt.z.S. / Kptlt. Hannes Weingärtner 17 August 1935 – 29 September 1937 Oblt.z.S. / Kptlt. Hans-Wilhelm von Dresky 30 September 1937 – 28 October 1938 Oblt.z.S. / Kptlt. Harro von Klot-Heydenfeldt 29 October 1938 – 16 January 1940 Oblt.z.S. Hans-Peter Hinsch 17 January – 7 June 1940 Oblt.z.S. Heinz-Otto Schultze 8 June – 28 July 1940 Oblt.z.S. Hans-Jürgen Zetzsche 29 July 1940 – 2 February 1941 Oblt.z.S. Hinrich-Oscar Bernbeck 3 February – 8 December 1941 Oblt.z.S. Wolfgang Leimkühler 9 December 1941 – 15 June 1942 Lt.z.S. / Oblt.z.S. Friedrich-Wilhelm Marienfeld 16 June 1942 – 23 January 1943 Joachim Düppe 24 January – 31 May 1943 Oblt.z.S. Paul Sander 1 June – 22 August 1943 Lt.z.S. / Oblt.z.S. Herbert Mumm 23 August 1943 – May 1944 Oblt.z.S. Hubert Rieger May - 9 July 1944[1]
Operations:	4 patrols: 1st patrol: 4 – 14 September 1939 2nd patrol: 19 – 29 September 1939 3rd patrol: 16 – 29 March 1939 4th patrol: 4 – 14 April 1940
Victories:	3 merchant ships sunk (5,133 GRT) 1 warship sunk (1,090 tons)

German submarine U-4 was a Type IIA U-boat of Nazi Germany's Kriegsmarine before and during World War II. She was one of the longest lasting German submarines of the period, primarily since half of her time was spent on training duties in the Baltic Sea.

Commissioned on 17 August 1935, she was one of the first batch of Type IIA boats constructed following the Anglo-German Naval Agreement that repealed the terms of the Treaty of Versailles which ended the First World War and stated that Germany was not permitted to possess submarines. Built at the Deutsche Werke in Kiel as yard number 239, she was a highly sought after command before the outbreak of the Second World War in 1939. Once the war had begun however, she rapidly became obsolete. Before she was superseded, she carried out four combat patrols, mainly in support of the Norwegian campaign.