unrestricted submarine warfare
Germany's unrestricted submarine warfare
unrestricted submarine warfare
Germany's submarine warfare was unrestricted. These attacks led to World War I.
Germany practiced unrestricted submarine warfare.
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Help end the British blockade
To get the blockade lifted.
it referred to sinking ships
Unrestricted Submarine Warfare.
American enterance into WWI.
Germany resumed unrestricted submarine warfare in 1915. The Germans declared the waters around the British Isle a war zone. The would attack any merchant ship entering that area.