SM U-20 [Note 1] 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 1913. During World War I, she took part in operations around the British Isles.

SM U-20 or U-XX was the lead boat of the U-20 class of submarines or U-boats built for and operated by the Austro-Hungarian Navy (German: Kaiserliche und Königliche Kriegsmarine or K.u.K. Kriegsmarine) during the First World War.

The SM U-20 was a German U-19 Type submarine built for the Kaiserliche Marine. She was commissioned on 5 August 1913. During World War I she sank 37 ships for a total of 145,830 tons and damaged 2 ships for a total of 2,643 tons.

The SM-U20 German boat has a notorious place in history for having sunk the British passenger liner RMS Lusitania, which resulted in heavy loss of innocent lives. There were 1959 passengers on board, and 1195 were killed.

26 Jun 1943 U-20 attempted to torpedo a Soviet submarine chaser in the Black Sea off Tuapse, but the target went on the offensive, dropping eight depth charges. The boat was then kept submerged by aircraft for four hours and subsequently …

U-20 may refer to one of the following German submarines: SM U-20 (Germany), was a Type U 19 submarine launched in 1912 and that served in the First World War until grounded on 4 November 1916; notable for sinking RMS Lusitania. During the First World War, Germany also had these submarines with similar names:

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 1913. During World War I, she took part in operations around the British Isles.

SM U-20 was a German Type U 19 U-boat built for service in the Kaiserliche Marine. She was launched on 18 December 1912, and commissioned on 5 August 1913. During World War I, she took part in operations around the British Isles.

12 Facts about the R.M.S. 'Lusitania' - factstory on SM U-20 12 Facts about the R.M.S. 'Lusitania' - factstory on Mauretania Specifications 7 épaves célèbres | Mental Floss - Blog Voyage on Passenger and Crew Statistics

The SM U-20 was a German U-19 type submarine which served in World War 1. The SM U-20 was built for the Kaiserliche marines and was commissioned on the 5th of August 1913. During World War 1, the SM U-20 sank 37 ships and damaged 2 ships.