Unrestricted submarine warfare is a type of naval warfare in which submarines sink merchant ships such as freighters and tankers without warning. The use of unrestricted submarine warfare has had significant impacts on international relations in regards to both the First World War and the Second World War. Its history has been dominated by German decision making.
There have been attempts to limit the use of unrestricted naval warfare, with some dating back to before the turn of the 20th Century as an extension of rules for surface raiders. While initially submarines operated successfully by attacking on the surface using deck guns, attacking without warning while submerged reduces the opportunity for the target to escape or defend itself if armed.
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buildup was complete, Germany's new military leadership waged unrestrictedsubmarinewarfare on allied shipping, which they claimed would defeat the British...
killing her." On 4 May 1940, in response to Germany's intensive unrestrictedsubmarinewarfare, during the Battle of the Atlantic and its invasion of Denmark...
deportations of Armenians, a major component of the genocide. Unrestrictedsubmarinewarfare was instituted in 1915 in response to the British naval blockade...
Zimmermann sent the telegram in anticipation of the resumption of unrestrictedsubmarinewarfare by Germany on February 1, which the German government presumed...
naval bases and defended by shore batteries. [citation needed] Unrestrictedsubmarinewarfare was instituted in 1915 in response to the British naval blockade...
the Japanese economy. The Navy adopted an official policy of unrestrictedsubmarinewarfare, and it appears the policy was executed without the knowledge...
bombing raids. On 4 May 1940, in response to Germany's intensive unrestrictedsubmarinewarfare, during the Battle of the Atlantic and its invasion of Denmark...
declared maritime war-zone around the UK, three months after unrestrictedsubmarinewarfare against the ships of the United Kingdom had been announced by...
of fuel and food in Germany. Berlin then decided to resume unrestrictedsubmarinewarfare. The aim was to break the transatlantic supply chain to Britain...
World War I, who became famous for his December 1916 memo about unrestrictedsubmarinewarfare against the United Kingdom. He was a recipient of Order of the...
navy adopted unrestrictedsubmarinewarfare,[citation needed] generally giving no warning of an attack. During the war, 360 submarines were built, but...
which specifically forbade any such attempt and ushered in unrestrictedsubmarinewarfare for the remainder of the war. The B-24 pilots mistakenly reported...
responsible for sinking RMS Lusitania, which was sunk as a result of unrestrictedsubmarinewarfare and is often cited among the reasons for the entry of the United...
loans. Bethmann Hollweg fought against the implementation of unrestrictedsubmarinewarfare but in the end bowed to pressure from the military and the conservatives...
in depth and camouflage, German infantry could be conserved. Unrestrictedsubmarinewarfare and strategic bombing would weaken the Anglo-French as the German...
the crews of captured vessels, and are contrasted to unrestrictedsubmarinewarfare where submarines attack without warning and do not act to protect crew...
The SubmarineWarfare Insignia (usually known as '"Dolphins"') are worn by qualified submariners. United States Navy Officers and Enlisted Sailors wear...
the navy's warfare mission. URL officers include officers from the Surface Warfare, SubmarineWarfare, Naval Aviation, and Special Warfare communities...
retribution against Japan, Roosevelt promulgated a new doctrine: unrestrictedsubmarinewarfare against Japan. This meant sinking any warship, commercial vessel...
of the British, Germany expected a similar response to its unrestrictedsubmarinewarfare. The Battle of Jutland in May/June 1916 was the only full-scale...
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