Germany changed the tactic during WWI via unrestricted submarine warfare, which meant that German U-boats could attack without warning any vessel it came across. Germany sank the civilian vessel ...

World War I was shaped by the new vehicles developed ... kicked off the modern era of submarine warfare by sending U-boats into the North Sea to improve its odds at sea. The vessels quickly ...

After the country resumed “unrestricted submarine warfare” once more, Wilson cut diplomatic ties. By the end of World War I, 344 U-boats had been commissioned, sinking more than 5,000 ships ...

Researchers took the first ever photographs of the sunken USS F-1, lost in 1917 in a collision off of California.

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 ...

many ships sunk during World War I's unrestricted submarine warfare. "Submarines are the Apex predators of maritime conflict," says James Goldrick, veteran and historian. They're terrifyingly ...

31 (UPI) --On this date in history: In 1917, Germany announces it will wage unrestricted submarine warfare against ... only one to take place during World War II. His remains, buried in an ...

As war fever increased, the Upstate rallied in support, and local hesitation changed to rabid enthusiasm. Local citizens cheered on the students from Clemson and Furman who rushed to enlist, bought ...

The number of British ships destroyed by U-boats nearly tripled after Germany declared unrestricted submarine warfare Previously unseen pictures of German submarines stranded on the English coast ...