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First World War: The German submarine U-9 sank three Royal Navy cruisers, resulting in approximately 1,450 deaths.
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World War I
1914–1918 global conflict
World War I or the First World War, also known as the Great War, was a global conflict between two coalitions: the Allies and the Central Powers. Main areas of conflict included Europe and the Middle East, as well as parts of Africa and the Asia-Pacific. There were important…Source: Wikipedia (CC BY-SA)
SM U-9
German Type U 9 U-boat
SM U-9 was a German Type U 9 U-boat. She was one of 329 submarines serving in the Imperial German Navy, and engaged in commerce raiding (Handelskrieg) during World War I.Source: Wikipedia (CC BY-SA)
Action of 22 September 1914
German U-boat ambush of British cruisers
The Action of 22 September 1914 was an attack by the German U-boat U-9 that took place during the First World War. Three obsolete Royal Navy cruisers of the 7th Cruiser Squadron manned mainly by Royal Naval Reserve part-timers and sometimes referred to as the Live Bait Squadron,…Source: Wikipedia (CC BY-SA)
Royal Navy
Naval warfare force of the United Kingdom
The Royal Navy (RN) is the naval warfare force of the United Kingdom. It is a component of His Majesty's Naval Service, and its officers hold their commissions from the King. Although warships were used by English and Scottish kings from the early medieval period, the first…Source: Wikipedia (CC BY-SA)