jan 31, 1917 - Germans Unleash U-Boats

Description:

INFO SOURCE:
https://www.history.com/this-day-in-history/germans-unleash-u-boats

Germany announced their resumption of submarine warfare, attacking all ships in the Atlantic. The Germans used U-Boats. U-Boats were submarines that were the most sophisticated at the time, the Germans most dangerous weapon.

2 visuals: Image and video

PHOTO SOURCE:
https://www.britannica.com/technology/U-boat

VIDEO SOURCE:
https://www.youtube.com/watch?v=RCrzaC4aLPg