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Germany practiced unrestricted submarine warfare.
Unrestricted Submarine Warfare.
Germany's return to unrestricted submarine warfare.
Unrestricted submarine warfare by the Germans provoked American involvement, following American involvement other countries joined the melee.
The renewal of unrestricted German submarine warfare had devastating effects on shipping in 1917. In terms of tonnage, the Germans sank 540,000 tons in February 1917, 578,000 in March and 874,000 tons in April. Anti-submarine measures by the Allies, however, began to reduce this calamity.
American enterance into WWI.
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unrestricted submarine warfare
Germany's unrestricted submarine warfare
it was Germany.
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