22 Sept, 1914 German U-Boat Submarine
1914 : For the first time in wartime the capabilities of Submarine warfare is seen when a German U-Boat submarine sinks three British cruisers, the Aboukir, the Hogue, and the Cressy, in just over one hour.
Taken from: https://www.thepeoplehistory.com/september22nd.html
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