Austin and Michael analyze World War I submarine warfare, highlighting how innovations like the automobile torpedo and ...

In 1917, Germany announces it will wage unrestricted submarine warfare against all ships, including passenger carriers, in ...

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 ...

A real threat to Britain's food supplies and Britain’s ability to continue the war effort came in 1916 when a new campaign of 'unrestricted submarine warfare' began with deadly effect ...