This Day In History

 

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