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SM U-21 was a U-boat built for the Imperial German Navy shortly before World War I. The third of four Type U-19-class submarines, these were the first...

U-21 may refer to one of the following German submarines: SM U-21 (Germany), was a Type U 19 submarine launched in 1913 and that served in the First World...

SM U-55 was one of the six Type U-51 U-boats of the Imperial German Navy during the First World War. U-55 was ordered from Germaniawerft, Kiel on 23 August...

SM U-21 or U-XXI was a U-20-class submarine or U-boat built for and operated by the Austro-Hungarian Navy (German: Kaiserliche und Königliche Kriegsmarine...

SM U-103 was an Imperial German Navy Type U 57 U-boat that was rammed and sunk by HMT Olympic during the First World War. U-103 was built by AG Weser...

SM U-5 SM U-6 SM U-7 SM U-8 SM U-9 SM U-10 SM U-11 SM U-12 SM U-13 SM U-14 SM U-15 SM U-16 SM U-17 SM U-18 SM U-19 SM U-20 SM U-21 SM U-22 SM U-23 SM U-24...

SM U-118 was a type UE II mine-laying submarine of the Imperial German Navy and one of 329 submarines serving with that navy during World War I. U-118...

HMS Pathfinder was sunk by SM U-21, the first ship to have been sunk by a submarine using a self-propelled torpedo. On 22 September, U-9 sank the armoured cruisers...

SM U-73 was one of 329 submarines serving in the Imperial German Navy in World War I. She engaged in the commerce war as part of the First Battle of the...

SM U-156 was a German Type U 151 U-boat commissioned in 1917 for the Imperial German Navy. From 1917 until her disappearance in September 1918 she was...

SM U-27 SM U-28 SM U-29 SM U-30 SM U-31 SM U-32 SM U-40 SM U-41 German Type U 31 submarine – 6 ships SM U-33 (temporary Austrian number for German SM U-33...

SM U-151 or SM Unterseeboot 151 ( ex U Oldenburg) was a World War I U-boat of the Imperial German Navy, constructed by Reiherstieg Schiffswerfte & Maschinenfabrik...

SM U-142 was one of the 329 submarines serving in the Imperial German Navy in World War I. U-142 was not engaged in the naval warfare. "SM" stands for...

SM U-35 was a German U 31-class U-boat which operated in the Mediterranean Sea during World War I. It ended up being the most successful U-boat participating...

SM U-90 was a Type U-87 U-boat of the Imperial German Navy during World War I. Its commander Walter Remy made regular stops at remote island North Rona...

SM U-20 was a German Type U 19 U-boat built for service in the Imperial German Navy. She was launched on 18 December 1912, and commissioned on 5 August...

SM U-28 was a Type U 27 U-boat that served in the First World War. It conducted 5 patrols, sinking 40 ships totalling 90,126 GRT. U-28 was commissioned...

were surrendered at war's end, with U-21 being ceded to Italy in 1920, and U-22 to France; both were broken up. SM U-20, the lead boat of the class, was...

SM U-36 was the number given to two German U-boats SM U-21 and SM U-47, when operating under the flag of Austria-Hungary in the Mediterranean Sea during...

World War I, the Pathfinder was sunk on 5 September 1914 by a German U-boat, the SM U-21. In May 1902, the British Admiralty issued an invitation to tender...