U-Boat Attacks (20 jun 1939 año – 20 jun 1945 año)
Descripción:
-U boats were used by Germany to attack British, American, and Canadian ships
-The ships were small and able to strike painful blows to Great Britain.
Añadido al timeline:
fecha:
20 jun 1939 año
20 jun 1945 año
~ 6 years