SM U-20

SM U-20 SM U-20 was a German Kaiserliche Marine submarine of the Type U-19 class that gained notoriety during the First World War for actions in the Atlantic Ocean and English Channel. Operated from bases such as Heligoland and Wilhelmshaven, the boat engaged in commerce raiding and participated in operations that influenced international responses including the United States entry into the First World War and shifts in naval warfare doctrine. Her service intersected with major figures and events of the era, including encounters affecting maritime law debates at venues like The Hague and diplomatic communications involving the British Admiralty and the German Imperial Chancellery.

Design and Construction

U-20 was laid down at the Kaiserliche Werft Danzig shipyard, part of German naval expansion driven by figures such as Alfred von Tirpitz and naval theorists influenced by Alfred Thayer Mahan and Julian Corbett. The Type U-19 design reflected lessons from earlier boats built by yards including AG Weser and Vulcan Stettin and paralleled contemporary designs like the British E-class submarine and French Clorinde-class submarine programs. The hull form and engineering were developed amid industrial networks linking firms such as Blohm & Voss, Siemens-Schuckert, and Deutschlandsche Schiff- und Maschinenbau suppliers. Naval architects referenced by the Imperial Navy included officers from Kaiser Wilhelm II’s naval staff and technical guidance echoed in reports circulated to institutions like the Reichstag naval committee and international observers from the Admiralty Research Establishment.

Operational History

Commissioned into the Kaiserliche Marine flotilla, the boat operated under the strategic doctrines emerging after the Battle of Coronel and before engagements like the Battle of Jutland. Deployments included patrols in the North Sea, the Irish Sea, and the approaches to Liverpool and the English Channel. Her patrols intersected with convoys and liners similar to those of RMS Lusitania and mail routes linked to the White Star Line and Cunard Line. Encounters and sinkings influenced diplomatic correspondence between the Foreign Office (United Kingdom) and the German Imperial Chancellery, and drew attention from naval authorities including Admiral Sir John Jellicoe and Chester W. Nimitz-era analysts in later retrospectives. Operations reflected tactical evolutions seen in contemporaneous raids such as the Scarborough Raid and submarine campaigns contemporaneous with the efforts of commanders from navies like the United States Navy, Royal Navy, and Imperial Japanese Navy.

Commander and Crew

Commanded by officers from the Imperial German Navy officer corps, the boat’s leadership belonged to personnel trained at institutions like the Naval Academy Mürwik and influenced by instructors associated with the Techno-Marine School and veteran captains who had served on ships such as SMS Deutschland and SMS Königsberg. Crewmen were drawn from regions including Prussia, Saxony, and Westphalia, and included specialists who had previously served on torpedo boats like SMS V-25 and cruisers such as SMS Emden. Command decisions were compared in contemporary analyses with those of notable submarine commanders from other nations, including Max Horton and Ludwig von Reuter (later), and were studied in postwar assessments by entities like the Inter-Allied Naval Commission.

Armament and Technical Specifications

The boat carried torpedo tubes comparable to fittings found on contemporaries such as the U-35 class and was equipped with deck guns similar in caliber to weapons mounted on other submarines of the period operated by navies like the Royal Navy and the French Navy. Propulsion systems used diesel engines from manufacturers akin to MAN and electric motors by firms like Siemens, echoing powerplants installed in boats built by AG Vulcan Stettin and Blohm & Voss. Navigation gear paralleled instruments produced by suppliers such as Zeiss and communication suites were akin to radio systems fielded by vessels overseen by the Admiralty and the Imperial German Naval Office (Reichsmarineamt). The boat’s endurance, speed, and armament were addressed in technical reviews alongside designs like the German Type U-31 submarine and British H-class submarine.

Wreck, Fate, and Legacy

The sinking of the boat became part of the larger narrative of undersea warfare that also involved vessels like U-boat U-35 and incidents influencing policy debates in capitals such as London, Berlin, and Washington, D.C.. The boat’s fate was examined by postwar investigators including teams from the Inter-Allied Commission and historians affiliated with institutions such as the Imperial War Museum, the Bundesarchiv, and academic centers like King’s College London. Her operational record contributed to doctrine changes implemented by navies including the Royal Navy, the United States Navy, and the later Kriegsmarine, and influenced legal discussions at forums like The Hague Conference and publications by scholars connected to Harvard University and the London School of Economics. Artefacts and accounts tied to the vessel are held or referenced by archives including the National Maritime Museum (United Kingdom), the Deutsches Schiffahrtsmuseum, and collections associated with the British Library and German Historical Institute.

Category:Imperial German Navy submarines Category:World War I submarines of Germany