Germany soon announced it would engage in unrestricted submarine warfare. Namely, German U-boats could sink virtually any vessel without warning. This policy would ultimately spell disaster for ...

Germany's unrestricted submarine warfare, however, was an intolerable affront to America's dignity and honor. At the start of 1917, British intelligence intercepted the Zimmerman telegram ...

During World War I, Germany’s U-boats engaged unrestricted submarine warfare, devastating attacks on British ships notably the Lusitania. Though first suspended, Germany’s policy of ...

Germany's unrestricted submarine warfare, however, was an intolerable affront to America's dignity and honor. At the start of 1917, British intelligence intercepted the Zimmerman telegram ...

Germany had a policy of unrestricted submarine warfare. If a ship was carrying supplies to one of its enemies, be that weapons or food, then it was seen as a legitimate target. On 7 May 1915 ...